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Journal articles on the topic 'Siliciclastic component'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Hu, Suyun, Wenzhi Zhao, Zhaohui Xu, et al. "Applying principal component analysis to seismic attributes for interpretation of evaporite facies: Lower Triassic Jialingjiang Formation, Sichuan Basin, China." Interpretation 5, no. 4 (2017): T461—T475. http://dx.doi.org/10.1190/int-2017-0004.1.

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In China and elsewhere, it is important to predict different lithologies and lithofacies for hydrocarbon exploration in a mixed evaporite-carbonate-siliciclastic system. The lower section of the second member of the Jialingjiang Formation (T1j2L) is mainly composed of anhydrite, dolostone, limestone, and siliciclastic rocks, providing a rare opportunity to reconstruct detailed facies in a [Formula: see text] 3D seismic survey with 31 wells. Wireline logs (sonic, density, and gamma ray) calibrated by core analysis are essential in distinguishing anhydrite, siliciclastics, and carbonates. Althou

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2

Vernik, Lev, and Jeremy Gallop. "Elastic depth trends for siliciclastic sequences." GEOPHYSICS 87, no. 1 (2021): MR25—MR34. http://dx.doi.org/10.1190/geo2021-0137.1.

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Elastic depth trends are an integral component of reservoir characterization whether explicitly or implicitly constructed. Applications to seismic data include migration velocity model building, pore-pressure prediction, inversion, and amplitude-variation-with-offset (AVO) analysis. In practice, workflows often involve fitting well logs with smooth curves, without reference to known lithology-dependent templates that could provide realistic constraints. We have constructed porosity-depth trends for shales and sandstones with reference to reliable measurements that span mechanical compaction an

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3

Larsen, Michael, Brian Bell, Pierpaolo Guarnieri, Henrik Vosgerau, and Rikke Weibel. "Exploration challenges along the North Atlantic volcanic margins: the intra-volcanic sandstone play in subsurface and outcrop." Geological Society, London, Petroleum Geology Conference series 8, no. 1 (2016): 231–45. http://dx.doi.org/10.1144/pgc8.13.

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AbstractThe margins of the North Atlantic rift are covered by an extensive succession of volcanic rocks, with up to 5 km of continental flood basalts, hyaloclastites and interbedded sedimentary rocks. The volcanic succession deteriorates seismic imaging and has hampered petroleum exploration in these areas. Focused research and pioneering exploration activity, however, has improved the understanding and development of new play models in volcanic-influenced basins. In 2004, the Rosebank discovery finally proved that intra-volcanic siliciclastic sandstones of the Flett Formation may form attract

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4

Iannone, Antonio, Salvatore Dominech, Chaosheng Zhang, Lucia Rita Pacifico, Alessio De Falco, and Stefano Albanese. "Principal Component Analysis to Discriminate and Locate Natural and Anthropogenic Sources of Contamination Within a Strongly Anthropized Region: A Technical Workflow." Environments 12, no. 5 (2025): 163. https://doi.org/10.3390/environments12050163.

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Environmental risks often stem from contamination driven by chemical stressors introduced from multiple sources, either geogenic or anthopogenic. Differentiating between anthropogenic chemical anomalies and those inherent to the environment is crucial. This distinction is essential for defining feasible remediation objectives. This study applied univariate and multivariate statistical techniques to analyse geochemical data from over 7000 topsoil samples in Campania (Southern Italy), over an area of approximately 13,600 km2. A key step in the methodology was applying Normal Score Transformation

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5

Zhang, Xiangtao, Xiaoping Li, Jiayuan Du, et al. "Mixed siliciclastic-carbonate sedimentation on the Miocene Pearl River continental shelf, northeastern South China Sea: Implications for exploring lithologic traps." Interpretation 9, no. 2 (2021): SC31—SC43. http://dx.doi.org/10.1190/int-2020-0162.1.

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During the Miocene, when the Zhujiang Formation was deposited, the eastern part of the Pearl River Mouth Basin, northern South China Sea, underwent intense mixed siliciclastic and carbonate sedimentation, particularly on the platform of the marginal ramp of the Dongsha Rise, northeastern margin of the South China Sea. Cores and well logs from industrial boreholes were collected and systematically investigated to reveal the sedimentary-petrographic characteristics of the mixed deposits and their formative processes. Four lithotypes were differentiated in the deposits, that is, (1) sandstone, (2

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6

Putri, Shaskia Herida, Zane Jobe, Jesse Melick, Lesli Wood, and Marsha French. "Depositional-process controls on chemofacies in mixed-lithology submarine lobe deposits: a high-resolution core study from the Permian Wolfcamp XY Formation, Delaware Basin, Texas, U.S.A." Journal of Sedimentary Research 95, no. 1 (2025): 63–85. https://doi.org/10.2110/jsr.2024.015.

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ABSTRACT Mixed siliciclastic–carbonate mudrocks have variable depositional processes and diagenetic pathways, creating mineralogical complexity and thus difficulty in characterizing reservoir quality using typical subsurface datasets (e.g., well logs) as well as conventional visual core-description techniques. Core-based X-ray fluorescence (XRF) data quantifies subtle elemental variations that can aid in interpreting fine-scale sedimentological packages and variations in reservoir-property distribution. XRF data has proven to be particularly useful for interpreting and defining the depositiona

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7

Alsultan, Hamid, and Karrar Awad. "Sequence Stratigraphy of the Fatha Formation in Shaqlawa Area, Northern Iraq." Iraqi Geological Journal 54, no. 2F (2021): 13–21. http://dx.doi.org/10.46717/igj.54.2f.2ms-2021-12-19.

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A surface section of the Fatha Formation (Middle Miocene) was studied in the Shaqlawa area, Erbil, Northern Iraq. It consists of siliciclastic silt, evaporates, and carbonates in a mixed siliciclastic silt composition. The Fatha Formation in the study area can be divided into two members of variable thickness based on rocky differences. Depositional settings ranged from shallow open-marine and restricted-hypersaline to supratidal and continental (sabkha, fluvio-deltaic, and exposure). It is bounded below by a type one sequence boundary above the Eocene Pila Spi Formation and marked by conglome

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8

Georgiev, Stoyan, Valeri Sachanski, Polina Andreeva, et al. "Trans-Saharan Belt Provenance: A Potential Source for the Ordovician Succession of the Balkan Terrane (Svoge Unit) - Clues from LA-ICP-MS Detrital Zircon Dating Analysis." Proceedings of the Bulgarian Academy of Sciences 75, no. 2 (2022): 237–47. http://dx.doi.org/10.7546/crabs.2022.02.09.

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Two sandstone samples from the upper and lower part of the Ordovician succession of Svoge Unit were analyzed in order to determine their detrital zircon U–Pb age spectra using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). One sample was collected from the Hirnantian siliciclastic glaciomarine deposits of the Sirman Formation. The other sample is amiddle Darriwilian sandstone from the lower half of the Grohoten Formation. Additionally, micropetrographic studies were performed. They are composed predominantly of detrital monocrystalline quartz grains with uniform or ra

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9

Kiessling, Wolfgang, and Martin Aberhan. "Environmental determinants of marine benthic biodiversity dynamics through Triassic-Jurassic time." Paleobiology 33, no. 3 (2007): 414–34. http://dx.doi.org/10.1017/s0094837300026373.

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AbstractEcology is thought to be of crucial importance in determining taxonomic turnover at geological time scales, yet general links between ecology and biodiversity dynamics are still poorly explored in deep time. Here we analyze the relationships between the environmental affinities of Triassic–Jurassic marine benthic genera and their biodiversity dynamics, using a large, taxonomically vetted data set of Triassic–Jurassic taxonomic occurrences.On the basis of binomial probabilities of proportional occurrence counts, we identify environmental affinities of genera for (1) carbonate versus sil

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10

Kiessling, Wolfgang, and Martin Aberhan. "Environmental determinants of marine benthic biodiversity dynamics through Triassic-Jurassic time." Paleobiology 33, no. 3 (2007): 414–34. http://dx.doi.org/10.1666/06069.1.

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AbstractEcology is thought to be of crucial importance in determining taxonomic turnover at geological time scales, yet general links between ecology and biodiversity dynamics are still poorly explored in deep time. Here we analyze the relationships between the environmental affinities of Triassic–Jurassic marine benthic genera and their biodiversity dynamics, using a large, taxonomically vetted data set of Triassic–Jurassic taxonomic occurrences.On the basis of binomial probabilities of proportional occurrence counts, we identify environmental affinities of genera for (1) carbonate versus sil

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11

Wood, Alexander J., Abraham E. Springer, and Benjamin W. Tobin. "Geochemical Variability in Karst-Siliciclastic Aquifer Spring Discharge, Kaibab Plateau, Grand Canyon." Environmental and Engineering Geoscience 26, no. 3 (2020): 367–81. http://dx.doi.org/10.2113/eeg-2345.

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ABSTRACT The source area of groundwater for springs discharging from lithologically variably perched aquifers is essential to understand when establishing baseline aquifer characteristics. Stratigraphic data from hydrostratigraphic outcrops and geochemical data from springs were used to characterize the hydrogeology of a remote, data-poor aquifer. This study focuses on the hydrogeological variability within the shallow karst-siliciclastic Coconino (C) aquifer on the Kaibab Plateau, north of Grand Canyon National Park. Stratigraphic data were collected from 8 locations, and 22 C aquifer springs

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12

He, Juan, Li Yang, Yunjie Fan, et al. "Mixed Sedimentation in the Transition Zone Between a Shallow-Water Delta and Tidal Flat and Its Influence on Reservoir Quality: A Case Study of Member B of the Asmari Formation in C Oilfield, South Iraq." Applied Sciences 15, no. 9 (2025): 5084. https://doi.org/10.3390/app15095084.

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The transition zone between a shallow-water delta and tidal flat is characterized by a high degree of mixed siliciclastic–carbonate sedimentation. There are frequent lateral and vertical variations in sandstone, dolostone, limestone, and mixed siliciclastic–carbonate rock (MSR); however, their influence on reservoir quality remains uncertain. Member B of the Asmari Formation (Asmari B) in Iraq’s C Oilfield was deposited in a remnant ocean basin formed by the closure of the Neo-Tethys Ocean. During the Oligocene–Miocene, frequent exposure of the Arabian Shield provided intermittent sediment sou

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13

Šimíček, Daniel, та Ondřej Bábek. "Assessing provenance of Upper Cretaceous siliciclastics using spectral γ-ray record". Geologica Carpathica 66, № 4 (2015): 311–29. http://dx.doi.org/10.1515/geoca-2015-0028.

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AbstractThe relationship between contents of clay minerals/grain size and spectral γ-ray record (concentrations of K, U and Th) in sediments is used for interpretation of sedimentary facies in wire-line logs. However, this approach is often complicated by the multi-component nature of mineralogically immature siliciclastics. As mineralogy of the source material and grain-size sorting during transport both contribute to the detrital composition of the final sediment, a joint study of facies and outcrop γ-ray spectra can potentially make the latter an effective tool in provenance studies. This p

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14

Jeans, C. V., J. G. Mitchell, M. Scherer, and M. J. Fisher. "Origin of the Permo-Triassic clay mica assemblage." Clay Minerals 29, no. 4 (1994): 575–89. http://dx.doi.org/10.1180/claymin.1994.029.4.14.

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AbstractClay mica is the predominant component of the fine-grained siliciclastic sediments of the Western European Permo-Trias and it may occur as the sole component of the clay assemblage. Its characteristics have been studied by chemical analysis, radioisotope (K/Ar) data, X-ray diffraction and electron microscopy in the clay assemblages from Triassic and Permian sediments in Spain, Western Approaches, South Devon and East Yorkshire. The clay mica is a ferric dioctahedral mineral containing on average 6.5% Fe2O3 and 7.5% K2O. Crystal thickness ranges from 8 × 10 Å to 115 × 10 Å, and varies w

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15

Ripa, Magnus, and Michael B. Stephens. "Chapter 9 Continental magmatic arc and siliciclastic sedimentation in the far-field part of a 1.7 Ga accretionary orogen." Geological Society, London, Memoirs 50, no. 1 (2020): 253–68. http://dx.doi.org/10.1144/m50-2017-3.

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AbstractTrachyandesitic to trachybasaltic lavas, interlayered siliciclastic sedimentary rocks and subaerial ignimbrites with a rhyolitic to trachydacitic composition lie unconformably above metamorphic rocks in west-central Sweden. These volcanic rocks erupted at 1711 + 7/−6 to 1691 ± 5 Ma and belong to a high-K, calc-alkaline to shoshonitic suite deposited in a continental arc setting. Positive ɛNd values and Nb/Yb ratios in the trachyandesitic to trachybasaltic rocks indicate an enriched mantle source. Coeval, 1710 ± 11 to 1681 ± 16 Ma plutonic and subvolcanic rocks are mainly granitic or qu

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16

Đorđević, Bojana, Hans-Jürgen Gawlick, Nevenka Djerić, Felix Schlagintweit, and Miloš Radonjić. "Middle Aptian Orbitolinid limestones in Belgrade (Serbia): microfacies and depositional environment." Geologia Croatica 76, no. 3 (2023): 147–56. http://dx.doi.org/10.4154/gc.2023.09.

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Lower Cretaceous (Aptian) shallow-marine limestones with intercalated polymictic conglomerates were investigated with respect to their biostratigraphic age and their microfacies. They are the younger part of the generally carbonate-siliciclastic Lower Cretaceous deep-water (max. few hundred metres) turbiditic sequences (“Paraflysch”) of the so-called East Vardar zone in the Belgrade area. The biostratigraphic age of the limestones was determined by orbitolinid foraminifera: the co-occurrence of Dictyoconus? pachymarginalis SCHROEDER and Mesorbitolina texana (ROEMER) besides various other micro

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17

Metodiev, Lubomir, Elena Koleva-Rekalova, Silviya Petrova, and Docho Dochev. "New data on the stratigraphy of the Middle Jurassic siliciclastic rocks from the West Balkan Mountains (West Bulgaria)." Geologica Balcanica 51, no. 1 (2022): 35–56. https://doi.org/10.52321/GeolBalc.51.1.35.

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The present study is a contribution to the lithostratigraphy of Middle Jurassic strata in the area of the Zimevitsa Plateau (West Balkan Mts, West Bulgaria). Based on its lithological and regional properties, the Dobravitsa Member is distinguished from the surrounding rocks of the Etropole Formation. The new member consists of alternating shales, siltstones and fine-grained sandstones. It also contains abundant siderite and calcite concretions, which are distributed in discrete stratigraphic horizons in both the mudrocks and coarser lithologies. Fossils are extremely r

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18

Slater, Ben J., and Graham E. Budd. "Comment on: Tang et al. [2019]: A problematic animal fossil from the early Cambrian Hetang Formation, South China." Journal of Paleontology 93, no. 06 (2019): 1276–78. http://dx.doi.org/10.1017/jpa.2019.54.

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AbstractTang et al. (2019) described new specimens of carbonaceous compression fossils from the early Cambrian Hetang Formation in South China, for which they established the new taxon Cambrowania ovata Tang and Xiao in Tang et al., 2019. Tang et al. (2019) interpreted these fossils as the remains of metazoans, representing either the carapaces of bivalve arthropods, or early life-cycle stages of sponges. We contest the animal affinity of these fossils; instead, we propose that the specimens described as Cambrowania ovata are actually large Leiosphaeridia—in other words, collapsed hollow organ

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19

Kallaste, T., E. Kiipli, T. Kiipli, and S. Siir. "Mean grain size fluctuations of the siliciclastic component in the Aizpute-41 core: implication for end-Ordovician glaciation; pp. 257–263." Estonian Journal of Earth Sciences 63, no. 4 (2014): 257. http://dx.doi.org/10.3176/earth.2014.28.

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20

RĂDAN, Sorin-Corneliu, and Silviu RĂDAN. "Integrated Magnetic Susceptibility and Lithological Studies on Lacustrine Recent Sediments from the Danube Delta." Geo-Eco-Mar No 15/2009 (December 31, 2009): 139–59. https://doi.org/10.5281/zenodo.57320.

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Abstract. The present paper is the first of a series of three, focused on the results of the integrated magnetic susceptibility and lithological studies carried out in several lacustrine areas of the Danube Delta, the Razim (Razelm) - Sinoie lagoonal Complex and the Black Sea Littoral Zone. Enviromagnetic fingerprints are recovered from the bottom sediments sampled in dynamic and confined aquatic environments and their intensities are evaluated and compared. Distinguishing features identified between different lakes are clearly reflected by the investigated enviromagnetic parameter (MS). The c

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21

Martini, Anna M., Lynn M. Walter, Timothy W. Lyons, Victoria C. Hover, and John Hansen. "Significance of early-diagenetic water-rock interactions in a modern marine siliciclastic/evaporite environment: Salina Ometepec, Baja California." GSA Bulletin 114, no. 9 (2002): 1055–69. http://dx.doi.org/10.1130/0016-7606(2002)114<1055:soedwr>2.0.co;2.

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Abstract Although marine brines are a significant component of pore waters in sedimentary basins, there are few geochemical studies of modern analogues of such systems, especially in siliciclastic settings. For these reasons, we chose the evaporite-associated siliciclastic sediments deposited in the salt flats of the Salina Ometepec, Baja California, for an integrated investigation of sediment, pore-water, and overlying brine geochemistry. Here, the detrital components include quartz, K-feldspar, plagioclase, chlorite, biotite, and smectite, and authigenic minerals are dominated by halite, gyp

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22

Bergman, Stefan, and Pär Weihed. "Chapter 3 Archean (>2.6 Ga) and Paleoproterozoic (2.5–1.8 Ga), pre- and syn-orogenic magmatism, sedimentation and mineralization in the Norrbotten and Överkalix lithotectonic units, Svecokarelian orogen." Geological Society, London, Memoirs 50, no. 1 (2020): 27–81. http://dx.doi.org/10.1144/m50-2016-29.

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AbstractTwo lithotectonic units (the Norrbotten and Överkalix units) occur inside the Paleoproterozoic (2.0–1.8 Ga) Svecokarelian orogen in northernmost Sweden. Archean (2.8–2.6 Ga and possibly older) basement, affected by a relict Neoarchean tectonometamorphic event, and early Paleoproterozoic (2.5–2.0 Ga) cover rocks constitute the pre-orogenic components in the orogen that are unique in Sweden. Siliciclastic sedimentary rocks, predominantly felsic volcanic rocks, and both spatially and temporally linked intrusive rock suites, deposited and emplaced at 1.9–1.8 Ga, form the syn-orogenic compo

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23

Goeting, Sulia, Vlasta Ćosović, Andrea Benedetti, et al. "Diversity and Depth Distribution of Modern Benthic Foraminifera Offshore Brunei Darussalam." Journal of Foraminiferal Research 52, no. 3 (2022): 160–78. http://dx.doi.org/10.2113/gsjfr.52.3.160.

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ABSTRACT The distribution of modern benthic foraminifera is studied from offshore mixed carbonate-siliciclastic settings of Brunei Darussalam located in northwestern Borneo (South China Sea). The sediments were collected from 17 sites (i.e., shallow reefs, sunken wrecks, and two depth transects). A total of 231 species were identified from 8 to 63 m water depth. We conducted several analyses to understand the patterns of faunal composition, including: (1) Cluster analysis and Principal Component Analysis together with correlation to define relation among the sites; (2) Diversity indices, such

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24

Rebouças, Renata Cardia, José Maria Landim Dominguez, and Abílio Carlos da Silva Pinto Bittencourt. "Provenance, transport and composition of Dendê Coast beach sands in Bahia, central coast of Brazil." Brazilian Journal of Oceanography 59, no. 4 (2011): 339–47. http://dx.doi.org/10.1590/s1679-87592011000400004.

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The great physiographic diversity of the Dendê Coast favors the production of different beach sediment types, including bioclastic components. In this study 74 beach samples collected at 2 km intervals were used to evaluate beach sediment composition. For each sample, 300 grains were identified for each grain size class coarser than 0.125 mm, using a binocular microscope. The beach sediments of the Dendê Coast are essentially siliciclastic (80-100%). Quartz is the major component (70-100%). Only at the Tinharé and Boipeba islands bioclasts are major components of beach sands reaching up to 80-

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25

Metodiev, Lubomir, Elena Koleva-Rekalova, Silviya Petrova, Docho Dochev, and Louiza Dimowa. "New data on the stratigraphy of the Middle Jurassic siliciclastic rocks from the West Balkan Mountains (West Bulgaria)." Geologica Balcanica 51, no. 1 (2022): 35–56. http://dx.doi.org/10.52321/geolbalc.51.1.35.

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The present study is a contribution to the lithostratigraphy of Middle Jurassic strata in the area of the Zimevitsa Plateau (West Balkan Mts, West Bulgaria). Based on its lithological and regional properties, the Dobravitsa Member is distinguished from the surrounding rocks of the Etropole Formation. The new member consists of alternating shales, siltstones and fine-grained sandstones. It also contains abundant siderite and calcite concretions, which are distributed in discrete stratigraphic horizons in both the mudrocks and coarser lithologies. Fossils are extremely rare. Poorly preserved amm

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26

Dub, S. A., N. V. Cherednichenko, D. V. Kiseleva, N. P. Gorbunova, T. Ya Gulyaeva, and L. K. Deryugina. "Trace element behaviour in acidic leachates (acetic, nitric and hydrochloric) from siliciclastic-carbonate rocks of the Upper Riphean Uk formation in the Southern Urals." LITHOSPHERE (Russia) 19, no. 6 (2020): 919–44. http://dx.doi.org/10.24930/1681-9004-2019-19-6-919-944.

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Research subject. 14 samples of limestone and one sample of carbonate-siliciclastic rock from siliciclastic-carbonate deposits of the Upper Riphean Uk Formation (the Southern Urals) were studied.Methods. Mineral and chemical composition of the samples were determined; the main tool for detecting the concentrations of trace elements was the ICPMS method. X-ray diffraction analysis was carried out using a Shimadzu XRD-7000 diffractometer, the content of major (rock-forming) oxides in bulk samples was established by X-ray fluorescence spectrometry on the SRM-35 and Shimadzu XRF 1800 spectrometers

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27

Powell, John H., Abdulkader M. Abed, and Yves-Michel Le Nindre. "Cambrian stratigraphy of Jordan." GeoArabia 19, no. 3 (2014): 81–134. http://dx.doi.org/10.2113/geoarabia190381.

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ABSTRACT The lower and middle Cambrian succession (Ram Group) in Jordan is described in lexicon-style format to document an important phase of Earth history following the uplift and erosion of the Arabian-Nubian Shield (Aqaba Complex) during the late Neoproterozoic, and younger, but more localised, intrusive and volcanic/volcaniclastic activity that formed the Araba Complex. The early Cambrian Ram Unconformity (ca. 530 Ma) marks the base of a predominantly fluvial siliciclastic succession derived from rapidly eroding Neoproterozoic (including Ediacaran) basement rocks, but includes a brief, bu

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Sommer, Carlos A., Evandro F. Lima, Lauro V. S. Nardi, Joaquim D. Liz, and Breno L. Waichel. "The evolution of Neoproterozoic magmatism in Southernmost Brazil: shoshonitic, high-K tholeiitic and silica-saturated, sodic alkaline volcanism in post-collisional basins." Anais da Academia Brasileira de Ciências 78, no. 3 (2006): 573–89. http://dx.doi.org/10.1590/s0001-37652006000300015.

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The Neoproterozoic shoshonitic and mildly alkaline bimodal volcanism of Southernmost Brazil is represented by rock assemblages associated to sedimentary successions, deposited in strike-slip basins formed at the post-collisional stages of the Brasilian/Pan-African orogenic cycle. The best-preserved volcano sedimentary associations occur in the Camaquã and Campo Alegre Basins, respectively in the Sul-riograndense and Catarinense Shields and are outside the main shear belts or overlying the unaffected basement areas. These basins are characterized by alternation of volcanic cycles and siliciclas

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29

Pollock, J. C., P. J. Sylvester, and S. M. Barr. "Lu–Hf zircon and Sm–Nd whole-rock isotope constraints on the extent of juvenile arc crust in Avalonia: examples from Newfoundland and Nova Scotia, Canada." Canadian Journal of Earth Sciences 52, no. 3 (2015): 161–81. http://dx.doi.org/10.1139/cjes-2014-0157.

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Avalonia, the largest accreted crustal block in the Appalachian orogen, consists of Neoproterozoic magmatic arc sequences that represent protracted and episodic subduction-related magmatism before deposition of an Ediacaran–Ordovician cover sequence including siliciclastic rocks. Zircon crystals were obtained from arc-related magmatic rocks and from clastic sedimentary sequences and analyzed in situ for their Hf-isotope composition. The majority of magmatic and detrital zircons are dominated by initial 176Hf/177Hf values that are more radiogenic than chondritic uniform reservoir (CHUR) with ca

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Dolníček, Zdeněk, Dalibor Velebil, and Jana Ulmanová. "Příspěvek k petrografii a mineralogii lokality Vyskočilka (Praha-Malá Chuchle, silur Barrandienu)." Bulletin Mineralogie Petrologie 31, no. 1 (2023): 47–64. http://dx.doi.org/10.46861/bmp.31.047.

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Classical locality Vyskočilka in the Barrandian Basin displays a well-exposed section of black Silurian shales penetrated by a ca. 10-m thick diabase sill. We examined the petrographic character and mineral composition of the intrusive body and enclosing shales, as well as the hydrothermal veins cutting the rocks. The diabase is a rock with basic affinity (paleobasaltoid), which was strongly influenced by post-magmatic alterations including albitization and zeolitization of feldspars as well as chloritization of clinopyroxenes and Fe-Ti spinelides. Host sediments show variously intense thermal

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Kowal-Kasprzyk, Justyna, Anna Waśkowska, Jan Golonka, Michał Krobicki, Petr Skupien, and Tadeusz Słomka. "The Late Jurassic–Palaeogene Carbonate Platforms in the Outer Western Carpathian Tethys—A Regional Overview." Minerals 11, no. 7 (2021): 747. http://dx.doi.org/10.3390/min11070747.

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The present work focuses on palaeogeographic reconstruction of shallow-water carbonate deposition in the Outer Western Carpathian Tethys. Platform deposits are preserved only as a component of turbidites and olistostromes, and reconstructions of these platforms are based on clastic material redistributed into slopes and deep basins and occurring among the Outer Carpathian nappes. Similar platforms were also present on the Tethys margins. These reconstructions were performed using the global models of plate tectonics. Several ridges covered by carbonate platforms developed in that area during t

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Johnson, Bradford J. "Stratigraphy and structure of the Early Proterozoic Wilson Island Group, East Arm thrust-fold belt, N.W.T." Canadian Journal of Earth Sciences 27, no. 4 (1990): 552–69. http://dx.doi.org/10.1139/e90-052.

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Investigation of the stratigraphy and structure of the 1.9 Ga Wilson Island Group has led to sedimentological and tectonic interpretations that are consistent with models for an Early Proterozoic collision between the Slave and Rae provinces. The lower part of the 8 km thick Wilson Island Group consists of alluvial clastic rocks and a bimodal volcanic suite. These are overlain by mixed siliciclastic and carbonate rocks that are inferred as representing a combination of alluvial and shallow-marine sedimentation. Finally, an upward-fining succession of feldspathic sandstone, ironstone, and mudst

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Huang, Kang-Jun, Fang-Zhen Teng, Bing Shen, et al. "Episode of intense chemical weathering during the termination of the 635 Ma Marinoan glaciation." Proceedings of the National Academy of Sciences 113, no. 52 (2016): 14904–9. http://dx.doi.org/10.1073/pnas.1607712113.

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Cryogenian (∼720–635 Ma) global glaciations (the snowball Earth) represent the most extreme ice ages in Earth’s history. The termination of these snowball Earth glaciations is marked by the global precipitation of cap carbonates, which are interpreted to have been driven by intense chemical weathering on continents. However, direct geochemical evidence for the intense chemical weathering in the aftermath of snowball glaciations is lacking. Here, we report Mg isotopic data from the terminal Cryogenian or Marinoan-age Nantuo Formation and the overlying cap carbonate of the basal Doushantuo Forma

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Nabage, N. A., A. S. Maigari, B. A. Umar, et al. "Compaction-induced porosity loss in the Cretaceous Bima Formation around Lakwaime and Dogon Dutsi, Yola Subbasin, Northern Benue Trough, NE Nigeria." Dutse Journal of Pure and Applied Sciences 10, no. 1b (2024): 231–42. http://dx.doi.org/10.4314/dujopas.v10i1b.24.

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The Bima Sandstone is an alluvial fan to braided river sedimentation that represents purely a siliciclastic depositional system. It is the oldest formation and the main reservoir unit in the entire Benue Trough. Porosity loss is an essential component of petroleum reservoirs that needs to be properly investigated for the purpose of hydrocarbon exploitation. Compaction and cementation processes are partly responsible for porosity loss in many known reservoirs around the world. Outcropping units of the formation around Lakwaime and Dogon Dutsi in Yola Sub-basin have been subjected to an integrat

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Hinnov, Linda A., and Richard J. Diecchio. "Milankovitch cycles in the Juniata Formation, Late Ordovician, Central Appalachian Basin, USA." Stratigraphy 12, no. 3-4 (2016): 287–96. http://dx.doi.org/10.29041/strat.12.4.07.

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The Juniata Formation is a thick succession of prevalently red, cyclically bedded arenites, wackes, and mudrocks found in the Upper Ordovician of the Central Appalachian Basin, USA. In outcrops close to the study area, the Juniata cycles predominantly have the characteristics of regressive tidal flat deposits. Long and continuous well logs of the subsurface Juniata provide an unparalleled opportunity to investigate Milankovitch controls on the cyclic deposition. In the Preston 119 well, northern West Virginia, a 2700-ft long gamma-ray well log provides a high-resolution proxy of terrigenous si

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Kozłowska, Aleksandra, Anna Feldman-Olszewska, Marta Kuberska, and Anna Maliszewska. "Diagenesis and the Conditions of Deposition of the Middle Jurassic Siderite Rocks from the Northern Margin of the Holy Cross Mountains (Poland)." Minerals 11, no. 12 (2021): 1353. http://dx.doi.org/10.3390/min11121353.

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The aim of the present study is to reconstruct sedimentary conditions of Middle Jurassic rocks that contain siderites to identify the mineral composition of the inserbeds and to recognize the origin of the siderite. Thin inserbeds of siderite rocks occur most frequently within Bajocian siliciclastic deposits and, more rarely, Aalenian and Bathonian. The research material comes from 11 boreholes located in the north and northeastern margins of the Holy Cross Mountains. The research methods included sedimentological analyses, and studies in polarizing and scanning electron microscopes, staining

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Kohlhepp, Bernd, Robert Lehmann, Paul Seeber, Kirsten Küsel, Susan E. Trumbore, and Kai U. Totsche. "Aquifer configuration and geostructural links control the groundwater quality in thin-bedded carbonate–siliciclastic alternations of the Hainich CZE, central Germany." Hydrology and Earth System Sciences 21, no. 12 (2017): 6091–116. http://dx.doi.org/10.5194/hess-21-6091-2017.

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Abstract. The quality of near-surface groundwater reservoirs is controlled, but also threatened, by manifold surface–subsurface interactions. Vulnerability studies typically evaluate the variable interplay of surface factors (land management, infiltration patterns) and subsurface factors (hydrostratigraphy, flow properties) in a thorough way, but disregard the resulting groundwater quality. Conversely, hydrogeochemical case studies that address the chemical evolution of groundwater often lack a comprehensive analysis of the structural buildup. In this study, we aim to reconstruct the actual sp

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Wakabayashi, John. "Clastic Sedimentary Rocks and Sedimentary Mélanges: Potential Naturally Occurring Asbestos Occurrences (Amphibole and Serpentine)." Environmental and Engineering Geoscience 26, no. 1 (2020): 15–19. http://dx.doi.org/10.2113/eeg-2267.

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ABSTRACT Petrography of mélange matrix and clastic sedimentary rocks in coastal California reveals the occurrence of detrital serpentine and detrital asbestiform sodic amphibole (glaucophane). Many sandstones of the Franciscan Complex have small amounts of detrital serpentine, with amounts of up to several percent in some cases. Detrital amphibole, including asbestiform glaucophane, is also present in some sandstones. Whereas rare sandstones have so much detrital glaucophane that they appear blue in hand specimen (up to nearly half of the rock volume), most glaucophane-bearing sandstones lack

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Wang, Liuqi, Dianne S. Edwards, Adam Bailey, et al. "Petrophysical and geochemical interpretations of well logs from the pre-Carboniferous succession in Barnicarndy 1, Canning Basin, Western Australia." APPEA Journal 61, no. 1 (2021): 253. http://dx.doi.org/10.1071/aj20038.

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Barnicarndy 1 is a stratigraphic well drilled in the southern part of the Canning Basin’s Barnicarndy Graben under Geoscience Australia’s Exploring for the Future program in collaboration with the Geological Survey of Western Australia to provide stratigraphic data for this poorly understood tectonic component. The well intersects a thin Cenozoic section, Permian–Carboniferous fluvial clastics and glacial diamictites and a thick pre-Carboniferous succession (855–2585mRT) unconformably overlying Neoproterozoic metasedimentary rocks. Three informal siliciclastic intervals were defined based on c

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McLean, Duncan, Matthew Booth, David J. Bodman, and Finlay D. McLean. "Carboniferous records of the Zoophycos group of trace fossils from England, Wales, the Isle of Man and the North Sea." Proceedings of the Yorkshire Geological Society 63, no. 2 (2020): 135–45. http://dx.doi.org/10.1144/pygs2019-007.

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The Zoophycos group of trace fossils is common in Carboniferous to recent marine strata and sediments, and is a common component of ichnofaunas in the Visean and Namurian stages of England and Wales. A review of new and published records indicates that it is often present in limestones and sandstones of Chadian to Arnsbergian age. Thereafter it is less common, and restricted to clastic rocks. There are no known records within Carboniferous strata above the lowest Westphalian. The form is most common and often abundant in limestones of the Yoredale facies in the upper Visean and lower Namurian

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KOLODNER, K., D. AVIGAD, M. McWILLIAMS, J. L. WOODEN, T. WEISSBROD, and S. FEINSTEIN. "Provenance of north Gondwana Cambrian–Ordovician sandstone: U–Pb SHRIMP dating of detrital zircons from Israel and Jordan." Geological Magazine 143, no. 3 (2006): 367–91. http://dx.doi.org/10.1017/s0016756805001640.

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A vast sequence of quartz-rich sandstone was deposited over North Africa and Arabia during Early Palaeozoic times, in the aftermath of Neoproterozoic Pan-African orogeny and the amalgamation of Gondwana. This rock sequence forms a relatively thin sheet (1–3 km thick) that was transported over a very gentle slope and deposited over a huge area. The sense of transport indicates unroofing of Gondwana terranes but the exact provenance of the siliciclastic deposit remains unclear. Detrital zircons from Cambrian arkoses that immediately overlie the Neoproterozoic Arabian–Nubian Shield in Israel and

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Ebbestad, Jan Ove R., and Juan Carlos Gutiérrez-Marco. "Phragmolites (Gastropoda) from the Late Ordovician of the Peruvian Altiplano." Journal of Paleontology 94, no. 2 (2019): 255–65. http://dx.doi.org/10.1017/jpa.2019.79.

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AbstractPhragmolites lissoni new species is described from 11 specimens found in the Sandbian Calapuja Formation near Calapuja in Peru. The deposits are part of the Central Andean Basin. This is the hitherto only systematically described Ordovician gastropod from Peru. The species is from a brachiopod-dominated siliciclastic sequence and is associated with bryozoans. Most specimens are preserved as external molds, but latex casts yield excellent details of shell ornamentation and are used as a basis for evaluating this feature in the genus. The characteristic ornamentation of Phragmolites shou

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Strzeboński, Piotr, Justyna Kowal-Kasprzyk, and Barbara Olszewska. "Exotic clasts, debris flow deposits and their significance for reconstruction of the Istebna Formation (Late Cretaceous – Paleocene, Silesian Basin, Outer Carpathians)." Geologica Carpathica 68, no. 6 (2017): 562–82. http://dx.doi.org/10.1515/geoca-2017-0037.

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AbstractThe different types of calcareous exotic clasts (fragments of pre-existing rocks), embedded in the Paleocene siliciclastic deposits of the Istebna Formation from the Beskid Mały Mountains (Silesian Unit, Western Outer Carpathians), were studied and differentiated through microfacies-biostratigraphical analysis. Calcareous exotics of the Oxfordian- Kimmeridgian age prevail, representing a type of sedimentation comparable to that one documented for the northern Tethyan margin. The Tithonian exotic clasts (Štramberk-type limestones), which are much less common, were formed on a carbonate

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Gverić, Zvonka, Nenad Tomašić, Goran Durn, and Vedran Rubinić. "The influence of weathering and pedogenesis on the geochemical record of Miocene marls and Plio-Quaternary sediments, Medvednica Mt., Croatia." Geologia Croatica 77, no. 3 (2024): 311–23. http://dx.doi.org/10.4154/gc.2024.17.

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The geochemical signature of weathering and pedogenesis in a temperate humid climate on two parent material types in the foothills of Medvednica Mt. was studied. Five soil profiles on Miocene marls and three sections of Plio-Quaternary (PlQ) proluvial sediments with overlying soil and weathered material were analyzed. The (clay) mineralogy of all profiles and sections had been determined in previous studies. The chemical composition of the samples was determined by inductively coupled plasma emission spectroscopy (ICP-OES) and inductively coupled plasma mass spectroscopy (ICP-MS). Poorly order

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Rivas, Ashley, Paul M. Myrow, Emily F. Smith, Lyle L. Nelson, Derek E. G. Briggs, and Lidya G. Tarhan. "MORPHOLOGY AND PRESERVATION OF GAOJIASHANIA, AN ENIGMATIC TUBULAR FOSSIL FROM THE UPPER EDIACARAN DUNFEE MEMBER, DEEP SPRING FORMATION, NEVADA, USA." Palaios 39, no. 12 (2024): 444–61. https://doi.org/10.2110/palo.2024.007.

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Abstract The upper Ediacaran stratigraphic record hosts fossil assemblages of Earth’s earliest communities of complex, macroscopic, multicellular life. Tubular fossils are a common and diverse, though frequently undercharacterized, component of many of these assemblages. Gaojiashania cyclus is an enigmatic tubular fossil and candidate index fossil found in upper Ediacaran strata globally and is best known from the Gaojiashan Lagerstätte of South China. Here we describe a recently discovered assemblage of Gaojiashania fossils from the Ediacaran Dunfee Member of the Deep Spring Formation of Neva

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ROBERTSON, ALASTAIR H. F., GILLIAN A. McCAY, KEMAL TASLI, and AŞEGÜL YILDIZ. "Eocene development of the northerly active continental margin of the Southern Neotethys in the Kyrenia Range, north Cyprus." Geological Magazine 151, no. 4 (2013): 692–731. http://dx.doi.org/10.1017/s0016756813000563.

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AbstractWe focus on an active continental margin related to northwards subduction during the Eocene in which sedimentary melange (‘olistostromes’) forms a key component. Maastrichtian – Early Eocene deep-marine carbonates and volcanic rocks pass gradationally upwards into a thick succession (<800 m) of gravity deposits, exposed in several thrust sheets. The lowest levels are mainly siliciclastic turbidites and debris-flow deposits. Interbedded marls contain Middle Eocene planktonic/benthic foraminifera and calcareous nannofossils. Sandstones include abundant ophiolite-derived grains. The hi

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Michalík, Jozef, Marta Bąk, Otília Lintnerová, and Štefan Méres. "Biostratigraphy, geochemistry and sedimentology of Middle to Late Jurassic strata in the Strážovce section (Strážovské vrchy Mts), Krížna Nappe of the Central Carpathians, Slovakia." Volumina Jurassica, no. 1 (December 27, 2017): 0. http://dx.doi.org/10.5604/01.3001.0010.7442.

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Abstract. The Jurassic / Lower Cretaceous sequence of the Strážovce section has been deposited in the central, axial part of the Zliechov Basin. Its most characteristic part – the Ždiar Formation consists of bedded siliceous radiolarian limestones and radiolarites. The radiolarian assemblage typical of the North Tethyan Bioprovince lived during mid Oxfordian – Early Kimmeridgian in a warm upper part of the well stratified water column, partially near to the thermocline. Radiolarian abundance decreases upwards. Productivity decrease is quantified by the share of biogenic SiO2 as well as by high

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Harzhauser, Mathias, and Werner E. Piller. "Integrated stratigraphy of the Sarmatian (Upper Middle Miocene) in the western Central Paratethys." Stratigraphy 1, no. 1 (2004): 65–86. http://dx.doi.org/10.29041/strat.01.1.04.

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The Vienna Basin and the Styrian Basin have been cornerstones for the definition and description of the Central Euro-pean Sarmatian Stage. New inter-and intrabasin correlations of well-logs and surface outcrops reveal a rather uniform development of depositional systems in all considered basins, which excludes local autocyclic processes as the sole trigger. The lithostratigraphy of these basins is critically summarized and the Wolfsthal Member is introduced as a new lithostratigraphic unit. The more than 1000-m-thick Sarmatian basin-fill is recorded in geophysical logs by a characteristic succ

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Ghandour, Ibrahim M., Ammar Mannaa, Omar Alharbi, Alaa A. Masoud, and Mohammed H. Aljahdali. "Major Factors Controlling the Elemental Composition of Al-Kharrar Lagoon Bottom Sediments, Rabigh, Saudi Arabia." Minerals 12, no. 9 (2022): 1096. http://dx.doi.org/10.3390/min12091096.

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Bottom sediments of Al-Kharrar Lagoon, Rabigh area, Saudi Arabia were analyzed for mineralogical (26 samples) and major oxides, minor, and trace elements (46 samples). The prime objective is to document the controlling factors of the mineralogical and chemical composition of the lagoon bottom sediments. Hierarchical cluster (HCA) and the principal component (PCA) analyses are used to disclose the degree of similarities among elements to distinguish them into statistically significant groups. Results clarified the interplay of terrestrial sediment influx through the temporarily active Wadi Rabi

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Maslov, A. V., D. V. Grazhdankin, S. A. Dub, et al. "Sedimentology and geochemistry of the Uk Formation, Upper Riphean, the Southern Urals." LITHOSPHERE (Russia) 19, no. 5 (2019): 659–86. http://dx.doi.org/10.24930/1681-9004-2019-19-5-659-686.

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Research subject. This article presents new data on carbonate facies of the upperUk subformation, Upper Riphean of theSouth Urals. A particular attention is paid to the distribution of rare-earth elements (REE) and yttrium (Y) in stromatolitic and intraclastic limestones and calcareous shales (bulk samples and their acetic acid leachates).Materials and methods. We have studied lithological features of limestones in the geological section and in thin sections. The contents of trace elements in rocks were determined by the ICP-MS method at the IGG UB RAS (Yekaterinburg), the composition of organ

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