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Journal articles on the topic 'Facies of siliceous porifera'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Hostettler, Bernhard, and Ursula. Menkveld-Gfeller. "Die Cidariden (Echinoidea, Echinodermata) der Wildegg-Formation (mittleres Oxfordien, Schweizer Jura)." Revue de Paléobiologie 34, no. 2 (2015): 195–233. https://doi.org/10.5281/zenodo.34342.

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Bavestrello, Giorgio, Attilio Arillo, Barbara Calcinai, et al. "Siliceous particles incorporation inChondrosia reniformis(Porifera, demospongiae)." Italian Journal of Zoology 65, no. 4 (1998): 343–48. http://dx.doi.org/10.1080/11250009809386771.

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3

Du, Yushan, Na Yin, Qinhong Hu, et al. "Quantitative Characterization of Full-Spectrum Pore Size and Connectivity for Shale with Different Sedimentary Facies from the Dongying Depression, Bohai Bay Basin, East China." Geofluids 2022 (May 31, 2022): 1–17. http://dx.doi.org/10.1155/2022/9744086.

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Working with shales in the fourth member of Shahejie Formation in the Dongying Depression in Bohai Bay Basin of East China, this study examines the facies classification, petrological characteristics, pore size distribution, and pore connectivity of oil-producing shale. The studied shales could be classified into five sedimentary facies according to a three-step classification criterion that consists of total organic carbon (TOC), sedimentary structure, and mineral composition. Among them, the “low TOC massive siliceous mudstone” and “low TOC layered clayey mudstone” facies have similar distri

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4

Stasiuk, L. D., and M. G. Fowler. "Organic facies in Devonian and Mississippian strata of Western Canada Sedimentary Basin: relation to kerogen type, paleoenvironment, and paleogeography." Bulletin of Canadian Petroleum Geology 52, no. 3 (2004): 234–55. http://dx.doi.org/10.2113/52.3.234.

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Abstract Petrographic analyses of dispersed organic matter (including macerals and palynomorphs), siliceous and calcareous microfossil assemblages and microtextures (e.g. stromatolitic) have been used to define and interpret five organic facies and regionally map their distribution for the following informal groupings of potential hydrocarbon source rocks in the Western Canada Sedimentary Basin: Upper Devonian Woodbend group, Upper Devonian Winterburn group and Upper Devonian to Lower Mississippian black shales of the Exshaw and Bakken formations. Five petrographic organic facies (A–E) are def

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Soua, Mohamed. "Application of Facies Associations, Integrated Prediction Error Filter Analysis, and Chemostratigraphy to the Organic-Rich and Siliceous Cenomanian-Turonian Sequence, Bargou Area, Tunisia: Integrated Sequence Stratigraphic Analysis." Journal of Geological Research 2012 (June 13, 2012): 1–15. http://dx.doi.org/10.1155/2012/973195.

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Facies associations, integrated prediction error filter analysis (INPEFA) of spectral Gamma-ray data, Sr/Ca and Mn chemostratigraphy, and sequence stratigraphy of the organic-rich and siliceous Cenomanian-Turonian Bahloul formation have been studied in Bargou section, located in north-central Tunisia. The studied section is subdivided into seven facies evolving from platform to basin deposits. Based on basin geometry, facies distribution, spectral Gamma-ray INPEFA curves, Sr/Ca and Mn profiles patterns, and the sequence was also subdivided into shelf margin wedge (uppermost Fahden Formation-lo

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Domack, Eugene W., and P. T. Harris. "A new depositional model for ice shelves, based upon sediment cores from the Ross Sea and the MaC. Robertson shelf, Antarctica." Annals of Glaciology 27 (1998): 281–84. http://dx.doi.org/10.3189/1998aog27-1-281-284.

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We document the similarity of depositional facies occurring in gravity cores recovered from two disjunct regions of the Antarctic continental shelf: the Ross Sea and the MaC. Robertson shelf. The facies sequence model is represented in two cores, one collected during the 1995-1 cruise of the R/VNathaniel R. Palmer(core NBP95 TC-18) and the other collected by the RSVAurora Australisduring cruise 149 in 1995 (core 149 39GC38). Both cores show a succession of facies indicative of ice-shelf retreat during the late-Pleistocene to Holocene transition. Distinct lithofacies range in thickness from a f

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Guidry, Sean A., and Henry S. Chafetz. "Siliceous shrubs in hot springs from Yellowstone National Park, Wyoming, U.S.A." Canadian Journal of Earth Sciences 40, no. 11 (2003): 1571–83. http://dx.doi.org/10.1139/e03-069.

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Many of the siliceous hot springs in Yellowstone National Park contain subaqueous, spinose siliceous precipitates up to 5 cm high that occupy shallow terracettes in siliceous terraced mound accumulations, discharge channels, etc. These siliceous "shrubs" are composed of opal-A with an arborescent or branching pattern and have strong morphological similarities to bacterial shrubs from carbonate-precipitating hot springs. Siliceous shrubs constitute a major precipitate style associated with discharge channel flow-path facies throughout most of the 20 m of flow path at Cistern Spring, Norris Ge

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Artushkova, O. V., and V. A. Maslov. "Devonian succession in the East-Zilair zone: conodont-based subdivision and paleontological verification." LITHOSPHERE (Russia) 22, no. 1 (2022): 14–38. http://dx.doi.org/10.24930/1681-9004-2022-22-1-14-38.

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Research subject. Conodont-based biostratigraphic subdivision of the monotonous siliceous-terrigenous sequence stratigraphically underlying the Famennian Zilair Formation.Materials and methods. Conodont imprints on the bedding planes from our own collections along with the data from other researchers were used for dating and subdivision of siliceous formations.Results. Our study of conodonts from the deposits underlying the Zilair Formation at a number of intersections on the eastern side of the Zilair synclinorium showed that the stratigraphic scale of the straton, previously recognised as th

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9

Jati Widiatama, Angga, Achmad Fahruddin, and Lauti Dwita Santy. "Characteristics of polymetallic enrichment on oceanic red bed in Matano Formation, Baturubei, Central Sulawesi, Indonesia." IOP Conference Series: Earth and Environmental Science 882, no. 1 (2021): 012045. http://dx.doi.org/10.1088/1755-1315/882/1/012045.

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Abstract The Matano Formation on Sulawesi Island has Cretaceous oceanic red bed (CORB) facies, but there is no further research on the geochemical characteristics of the sedimentary rocks. This study aims to classify the CORB of the Matano Formation and reveal the polymetallic element enrichment in CORB by using the X-ray fluorescence (XRF) analysis method. Matano Formation in the research area consists of two different facies: radiolarites facies and red clay facies. Radiolarites facies grouped as Si-ORB, dominated by siliceous pelagic bioclastic and deposited under oxic environment. The red

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10

Pervushov, Evgeny M. "Colonial Leptophragmidae (Porifera, Hexactinellida) from the Lower Santonian of the Volga region." Izvestiya of Saratov University. Earth Sciences 23, no. 1 (2023): 53–60. http://dx.doi.org/10.18500/1819-7663-2023-23-1-53-60.

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Study of the skeletal morphology of a new representative of the Leptophragmidae family, with no suboscula in its structure, provides support for the earlierspecified regularities in generation of Hexactinellida modular forms. Good preservationstate of a majorcolony has made it possible to specify the aspects of paleoecology and taphonomy in the later representatives of the Middle Coniacian – Early Santonian succession of siliceous sponges.

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Leinfelder, Reinhold R., Manfred Krautter, Martin Nose, Miguel M. Ramalho, and Winfried Werner. "Siliceous sponge facies from the Upper Jurassic of Portugal." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 189, no. 1-3 (1993): 199–254. http://dx.doi.org/10.1127/njgpa/189/1993/199.

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12

Zhou, Xiaofeng, Jun Zhao, Baonian Yan, et al. "Deep-Water Traction Current Sedimentation in the Lower Silurian Longmaxi Formation Siliceous Shales, Weiyuan Area, Sichuan Basin, China, Using Nano-Resolution Petrological Evidence." Minerals 15, no. 7 (2025): 723. https://doi.org/10.3390/min15070723.

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Despite the shale revolution triggering global shale oil and gas exploration, our understanding of the sedimentary environments of deep-water organic-matter-rich shale remains unclear. The sedimentary environment and facies of some siliceous shales at the bottom of the Longmaxi Formation in the Weiyuan area of the Sichuan Basin, China, were therefore analyzed. Nano-resolution petrological characterization and genesis analysis of the siliceous shales studied were conducted using nano-resolution petrologic image datasets. We identified these siliceous shales as microbial mats formed by deep-wate

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13

Haq, Izhar Ul, Eswaran Padmanabhan, and Omer Iqbal. "Depositional Heterogeneities and Brittleness of Mudstone Lithofacies in the Marcellus Subgroup, Appalachian Basin, New York, U.S.A." Energies 14, no. 20 (2021): 6620. http://dx.doi.org/10.3390/en14206620.

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Organic-rich rocks of the Marcellus subgroup in the study area consist of a diverse suite of mudstone lithofacies that were deposited in distinct facies belts. Lithofacies in the succession range in composition from argillaceous to siliceous, calcareous, and carbonaceous mudstone. Heterogeneities in the succession occurs in the form of varying mineralogical composition, slightly bioturbated to highly bioturbated chaotic matrix, organic-rich and organic-lean laminae, scattered fossil shells in the matrix, and fossils acting as lamination planes. Lithofacies were deposited in three facies belts

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14

Hughes, G. Wyn. "Silicosphaera asteroderma (Porifera), a new siliceous microfossil from the South China Sea." Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 1985, no. 10 (1985): 599–604. http://dx.doi.org/10.1127/njgpm/1985/1985/599.

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15

Duarte, Luis Vitor, Manfred Krautter, and Antonio Ferreira Soares. "Bioconstructions a spongiaires siliceux dans le Lias terminal du Bassin lusitanien (Portugal); stratigraphie, sedimentologie et signification paleogeographique." Bulletin de la Société Géologique de France 172, no. 5 (2001): 637–46. http://dx.doi.org/10.2113/172.5.637.

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Abstract The Upper Liassic series in the western border of Iberia (Lusitanian Basin, Portugal), show an important lutitic sedimentation, characterized generally by a monotonous marl/limestone alternation. Small scale siliceous sponge mudmounds occur in these deposits from Middle Toarcian to Lower Aalenian age. The scope of this work is to pinpoint the stratigraphical and sedimentological context and to characterize controlling factors of the spongioliths. Stratigraphic and facies analysis. Relevant sections were observed and investigated in different locations of the Lusitanian Basin (e.g., Al

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Xu, Longfei, Jinchuan Zhang, Jianghui Ding, et al. "Pore Structure and Fractal Characteristics of Different Shale Lithofacies in the Dalong Formation in the Western Area of the Lower Yangtze Platform." Minerals 10, no. 1 (2020): 72. http://dx.doi.org/10.3390/min10010072.

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The purpose of this article was to quantitatively investigate the pore structure and fractal characteristics of different lithofacies in the upper Permian Dalong Formation marine shale. Shale samples in this study were collected from well GD1 in the Lower Yangtze region for mineral composition, X-ray diffraction (XRD), and nitrogen adsorption–desorption analysis, as well as broad-ion beam scanning electron microscopy (BIB-SEM) observation. Experimental results showed that the TOC (total organic carbon) content and vitrinite reflectance (Ro) of the investigated shale samples were in the ranges

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17

Luzhnaya, E. A., E. A. Zhegallo, L. V. Zaitseva, and A. L. Ragozina. "Problematical Porifera from the Lower Cambrian of Western Mongolia." Палеонтологический журнал, no. 3 (May 1, 2023): 22–34. http://dx.doi.org/10.31857/s0031031x2303011x.

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From the lower part of the Tommotian Stage of the Lower Cambrian of Western Mongolia, ridge Hevte-Tsakhir-Nuruu described a new species of problematical microfossils of the genus Aetholicopalla Conway Morris in Bengtson et al., 1990, whose representatives are sometimes the dominants of the Early Cambrian taphocoenoses. A. grandipora sp. nov. – spheroidal organisms with initially carbonate (?) skeleton; planktonic and benthic forms described; the latter have a variable shape and attachment sites to the bottom substrate. The outer wall of the fossils is perforated, thin, double; the functional i

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18

Pu, Boling, Dazhong Dong, Xinjun Ning, Shufang Wang, Yuman Wang, and Shaoke Feng. "Lithology and sedimentary heterogeneity of Longmaxi shale in the southern Sichuan Basin." Interpretation 10, no. 1 (2021): T45—T56. http://dx.doi.org/10.1190/int-2020-0198.1.

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Producers have always been eager to know the reasons for the difference in the production of different shale gas wells. The Southern Sichuan Basin in China is one of the main production zones of Longmaxi shale gas, whereas the shale gas production is quite different in different shale gas wells. The Longmaxi Formation was deposited in a deepwater shelf that had poor circulation with the open ocean, and it is composed of a variety of facies that are dominated by fine-grained (clay to silt size) particles with varied organic matter distribution, causing heterogeneity of the shale gas concentrati

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Chen, Xianglin, Qiuchen Xu, Yinglun Qin, et al. "Effect of Paleoenvironmental Conditions on the Distribution of Lower Carboniferous Shale in Yaziluo Rift Trough, South China: Insights from Major/Trace Elements and Shale Composition." Minerals 14, no. 7 (2024): 659. http://dx.doi.org/10.3390/min14070659.

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Paleoenvironmental conditions significantly influence the distribution patterns and organic matter enrichment of shale. This study investigated the vertical variations of major elements, trace elements, and total organic carbon (TOC) in the Lower Carboniferous marine shale from the Yaziluo Rift Trough, South China, to understand the paleoenvironmental conditions, including redox conditions, terrigenous detrital input, paleoproductivity, and paleo-seawater depth. The Lower Carboniferous formation consists of three sedimentary facies: basin facies, lower slope facies, and upper slope facies. Fro

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Qin, Xiaoli, Rongxi Li, Lei Chen, et al. "Diagenetic Facies and Their Controls on the Quality of Tight Sandstone Reservoirs: A Case Study from the Upper Paleozoic Gas Reservoir in the Eastern Ordos Basin, North China." Geofluids 2023 (May 23, 2023): 1–14. http://dx.doi.org/10.1155/2023/4445749.

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Diagenetic facies play a significant role in the evaluation and prediction of reservoirs as they comprehensively reflect the spatial distribution characteristics of deposition, diagenesis, and petrophysical properties. Based on the petrographic observation and considering pores, lithology, and diagenesis types, the diagenetic facies types were identified, and the pore evolution process and its influence on the quality of low permeability tight gas reservoirs were analyzed. The results show that six types of diagenetic facies were identified, including siliceous cementation intergranular pore f

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Ozalas, Kate, Charles E. Savrda, and Robert R. Fullerton. "Bioturbated oxygenation-event beds in siliceous facies: Monterey Formation (Miocene), California." Palaeogeography, Palaeoclimatology, Palaeoecology 112, no. 1-2 (1994): 63–83. http://dx.doi.org/10.1016/0031-0182(94)90134-1.

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22

El Kadiri, Khalil. "Description de nouvelles espècies deradiolaires jurassiques de la dorsales calcaire externe (Rif, Maroc)." Spanish Journal of Palaeontology 7, no. 3 (2022): 37. http://dx.doi.org/10.7203/sjp.25013.

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The study of radiolaria obtained from the botton of the Jurassic radiolarian beds in the Rif "Dorsale calcaire externe" display the study of some new species. Sorne one and two new genres are described here. The presence of ammonites in the botton of that facies and the inmediately in the lower beds attribute an Upper Lias or Lower Dogger age to the siliceous micro-faune recolted.

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Nadhira, Ardianty, Mark D. Sutton, Joseph P. Botting, et al. "Three-dimensionally preserved soft tissues and calcareous hexactins in a Silurian sponge: implications for early sponge evolution." Royal Society Open Science 6, no. 7 (2019): 190911. http://dx.doi.org/10.1098/rsos.190911.

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Sponges (Porifera), as one of the earliest-branching animal phyla, are crucial for understanding early metazoan phylogeny. Recent studies of Lower Palaeozoic sponges have revealed a variety of character states and combinations unknown in extant taxa, challenging our views of early sponge morphology. The Herefordshire Konservat–Lagerstätte yields an abundant, diverse sponge fauna with three-dimensional preservation of spicules and soft tissue. Carduispongia pedicula gen. et sp. nov. possesses a single layer of hexactine spicules arranged in a regular orthogonal network. This spicule type and ar

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Malik, Muhammad Hammad, Ardiansyah Koeshidayatullah, Adhipa Herlambang, Khalid Al-Ramadan, and Michael A. Kaminski. "Vase-shaped microfossils and possible trochamminid foraminifera from the Ediacaran Dhaiqa Formation of Saudi Arabia." Stratigraphy 21, no. 1 (2024): 67–78. http://dx.doi.org/10.29041/strat.21.1.04.

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We report the first discovery of vase-shaped microfossils (VSMs) and possible multichambered foraminifera from the Ediacaran rocks of Saudi Arabia. The Ediacaran successions of Saudi Arabia are well exposed in the northwestern and central part of the Arabian plate but are relatively understudied due to the lack of economic potential. The exposures can be found in different small sedimentary basins distributed along the flanks of Najd Fault system of the western Arabian Plate. The Dhaiqa sub-basin located near the historic city of Al-Ula contains some of the best exposures of Ediacaran Mattar a

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Fedorov, Petr V. "Lower Ordovician mud mounds from the St. Petersburg region, northwestern Russia." Bulletin of the Geological Society of Denmark 50 (April 30, 2003): 125–37. http://dx.doi.org/10.37570/bgsd-2003-50-10.

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Hecker-type mud mounds are calcareous-clay buildups occurring in the Lower Ordovician (Billingen and Volkhov regional stages), condensed cool-water carbonates of northwestern Russia. The unusual feature of these buildups is the dominance of terrigenous clay in their cores. In all the buildups an initial gently-sloping mound of unconsolidated fossiliferous clay rests on a hardground surface. A layer of microsparite overlies the clay, with another hardground surface on the top. The mud mounds vary in diameter from tens centimetres to hundreds metres. Large mounds form complex multi-storey struct

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Olshtynska, O. P., G. M. Ivanova, and I. I. Pustovoit. "BIOGENIC SILICA SEDIMENTATION ON THE SHELF AND CONTINENTAL SLOPE OF THE BLACK SEA." Geological Journal, no. 2 (July 15, 2021): 79–89. http://dx.doi.org/10.30836/igs.1025-6814.2021.2.226856.

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Investigation of the marine sediments processes, regularities of their accumulation in the inland seas is one of the main tasks of marine geology and sedimentology. Biogenic sedimentation is extremely important in the general sediment deposition cycle in the Black Sea basin. This article provides an overview of the literature and analysis of our own research of the distribution of biogenic siliceous deposits in Holocene bottom sediments on the shelf and continental slope of the Black Sea. The composition and conditions of biosilicates formation, their relationship with coccolithic silts and sa

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El Haddi, H., A. Benbouziane, and M. Mouflih. "Geochemical Siliceous and Silicified Facies of Phosphate Series of Ouled Abdoun Basin (Morocco)." Open Journal of Geology 04, no. 07 (2014): 295–302. http://dx.doi.org/10.4236/ojg.2014.47022.

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Angevin, Raphaël. "Contribution à un inventaire des ressources siliceuses du département de l’Allier (Auvergne, France), l’ouest du Bourbonnais et la moyenne vallée du Cher / Contribution to an inventory of siliceous raw materials of the Allier department (Auvergne, France), the west part of Bourbonnais and Cher valley." Revue des sciences naturelles d'Auvergne 76, no. 1 (2012): 53–64. https://doi.org/10.3406/rsna.2012.1060.

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Contribution to an inventory of siliceous raw materials of the Allier department (Auvergne, France). The west part of Bourbonnais and Cher valley This article presents an inventory of flint resources in the west part of the Allier department, between Cher and Allier. These flints essentially consist on Tertiary rocks (Eocene and Oligocene). They have a variety of facies, apparent in very different tints and textures. Alongside classical intraformational rocks, several are characteristic of a pedogenetic origin (“silcrete”). This kind of raw material can hardly be used for blade knapping.

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Wang, Xiaohong, Lu Gan, Klaus P. Jochum, Heinz C. Schröder, and Werner E. G. Müller. "The Largest Bio-Silica Structure on Earth: The Giant Basal Spicule from the Deep-Sea Glass SpongeMonorhaphis chuni." Evidence-Based Complementary and Alternative Medicine 2011 (2011): 1–14. http://dx.doi.org/10.1155/2011/540987.

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The depth of the ocean is plentifully populated with a highly diverse fauna and flora, from where the Challenger expedition (1873–1876) treasured up a rich collection of vitreous sponges [Hexactinellida]. They have been described by Schulze and represent the phylogenetically oldest class of siliceous sponges [phylum Porifera]; they are eye-catching because of their distinct body plan, which relies on a filigree skeleton. It is constructed by an array of morphologically determined elements, the spicules. Later, during the German Deep Sea Expedition “Valdivia” (1898-1899), Schulze could describe

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Eftekhari, Seyedeh Hajar, Mahmoud Memariani, Zahra Maleki, et al. "Employing Statistical Algorithms and Clustering Techniques to Assess Lithological Facies for Identifying Optimal Reservoir Rocks: A Case Study of the Mansouri Oilfields, SW Iran." Minerals 14, no. 3 (2024): 233. http://dx.doi.org/10.3390/min14030233.

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The crucial parameters influencing drilling operations, reservoir production behavior, and well completion are lithology and reservoir rock. This study identified optimal reservoir rocks and facies in 280 core samples from a drilled well in the Asmari reservoir of the Mansouri field in SW Iran to determine the number of hydraulic flow units. Reservoir samples were prepared, and their porosity and permeability were determined by measuring devices. The flow zone index (FZI) was calculated for each sample using MATLAB software; then, a histogram analysis was performed on the logarithmic data of t

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Martínez Aparicio, German, Pedro Patarroyo, and Roberto Terraza Melo. "Lithology and geochemistry of the Guadalupe Group base around Tunja, Boyacá, Colombia." Boletín Geológico, no. 47 (December 23, 2020): 35–65. http://dx.doi.org/10.32685/0120-1425/boletingeo.47.2020.494.

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The base of the Guadalupe Group, in the Tunja area of Colombia, contains cherts, porcellanites, mudstones, and siltstones with subordinate quartz arenites. The lithostratigraphic description of two stratigraphic sections showed that the dominant facies have fine granular textures and siliceous compositions, which considerably differ from those of the prevailing sandy terrigenous facies described in the type locality in the Eastern Hills of Bogotá, in the Arenisca Dura Formation, the basal unit of the Guadalupe Group in this sector. The units that form the Guadalupe Group (base of the Gua

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Wang, Meng, Jiang He, Shu Liu, et al. "Effect of Sedimentary Facies Characteristics on Deep Shale Gas Desserts: A Case from the Longmaxi Formation, South Sichuan Basin, China." Minerals 13, no. 4 (2023): 476. http://dx.doi.org/10.3390/min13040476.

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Shale gas is one of the hot spots of energy development. Due to the strong heterogeneity and low physical properties of shale gas reservoirs, and the complex influencing factors of pore development, it is necessary to conduct a comprehensive analysis of the control factors of high-quality reservoirs. The sedimentary characteristics, mineral composition, pore structure and controlling factors of high quality reservoir development are studied on the basis of thin section, scanning electron microscopy (SEM) and QEMSCAN analysis, X-ray diffraction (XRD), total organic carbon (TOC), Nano-CT scannin

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NEUMANN, P. "Turbidite deposition in the Early Late Cretaceous Pindos Basin (External Hellenides)." Bulletin of the Geological Society of Greece 34, no. 2 (2018): 771. http://dx.doi.org/10.12681/bgsg.17355.

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The lower Upper Cretaceous clastic lithologies of the Pindos Zone in western Greece document a phase of enhanced tectonism. They are preserved as mixed carbonate/siliciclastic turbidite associations alternating with deep-marine siliceous sediments. New faunal and sedimentological data recovered from these deposits hint at two major pulses of turbidite shedding commencing at the change from the Early to the Middle Cenomanian and in the Late Turonian. The deposits are organized in generally thin clastic packages that can be attributed to lower fan facies. Different sources are likely for the occ

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Appel, P. W. U., and A. A. Garde. "Stratabound scheelite and stratiform tourmalinites in the Archaean Malene supracrustal rocks, southern West Greenland." Bulletin Grønlands Geologiske Undersøgelse 156 (January 1, 1987): 1–26. http://dx.doi.org/10.34194/bullggu.v156.6698.

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The Malene supracrustal rocks form large enclaves in the late Archaean Nûk gneisses within an area of at least 36 000 km2 on the west coast of Greenland and have been repeatedly deformed and metamorphosed under amphibolite facies conditions. Stream sediment sampling has shown that scheelite occurs in the supracrustal enclaves throughout the area. It occurs stratabound in amphibolites, micaceous quartzites, siliceous cordierite-bearing metasediments and tourmalinites. A detailed geological map has been made of the central part of Store Malene mountain close to Nuuk. Banded metavolcanic Malene a

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Veenma, Yorick P., Kayla McCabe, Andrew H. Caruthers, et al. "The glass ramp of Wrangellia: Late Triassic to Early Jurassic outer ramp environments of the McCarthy Formation, Alaska, U.S.A." Journal of Sedimentary Research 92, no. 10 (2022): 896–919. http://dx.doi.org/10.2110/jsr.2022.004.

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Abstract The marine record of the Triassic–Jurassic boundary interval has been studied extensively in shallow-marine successions deposited along the margins of Pangea, particularly its Tethyan margins. Several of these successions show a facies change from carbonate-rich to carbonate-poor strata attributed to the consequences of igneous activity in the Central Atlantic Magmatic Province (CAMP), which included a biocalcification crisis and the end-Triassic mass extinction. Evidence for a decline in calcareous and an increase in biosiliceous sedimentation across the Triassic–Jurassic boundary in

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Kiessling, Wolfgang. "Facies characterization of mid-mesozoic deep-water sediments by quantitative analysis of siliceous microfaunas." Facies 35, no. 1 (1996): 237–74. http://dx.doi.org/10.1007/bf02536964.

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Nievoll, Josef, Harald Fritz, Daniela Gallhofer, Christoph Hauzenberger, Michael Pfatschbacher, and Bernadette Gritsch. "From shallow into deep sea: Sedimentary facies and U-Pb zircon ages in the early Paleozoic Noric Group at Veitsch (Eastern Greywacke Zone, Austria)." Austrian Journal of Earth Sciences 115, no. 1 (2022): 41–73. http://dx.doi.org/10.17738/ajes.2022.0003.

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Abstract The low-grade metamorphic early Paleozoic basement of the Veitsch area presents a wide variety of sedimentary facies domains. The first domain consists of thick metadacites of Middle Ordovician age (Blasseneck Porphyroid), overlain by fine-grained metaclastics of the Rad Formation (Late Ordovician to Silurian) and Devonian limestones and calcitic marbles (Kaiserstein and Kaskögerl Formation, respectively). Rhyolitic to dacitic magmatism initiated at ca. 479 Ma (LAMC-ICP-MS U-Pb zircon data) and lasted until ca. 444 Ma. The second domain comprises metaclastics of the Stocker Formation

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Snachev, Vladimir I., Aleksandr V. Snachev, and Vsevolod Yu Prokofiev. "Physicochemical conditions of the formation of the Larino granite-gneiss dome (South Ural)." Georesursy 24, no. 1 (2022): 74–83. http://dx.doi.org/10.18599/grs.2022.1.7.

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The Larino granite-gneiss dome is located on the border of the Aramil-Sukhtelya and Magnitogorsk megazones and is a two-headed anticlinal structure, the nuclear parts of which are composed of granitoids of the Pervomai and Larino massifs, and their framing – apovolcanic amphibolites, garnet-mica-tins, garnet-amphislans siliceous-carbonaceous schists of the Bulatovo Series (S1–D1bl). A series of concentric high-gradient zones of metamorphism are observed from granitoids to shales. Mineral parageneses of the amphibolite facies at a distance of several kilometers are replaced by associations of e

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Phillips, R. Ikhane, F. Folorunso Adetayo, E. Nton Matthew, A. Oluwalaanu Josiah, and O. Oyebolu Olalekan. "FACIES EVALUATIONS AND PALEOENVIRONMENTAL RECONSTRUCTION OF THE TURONIAN NKALAGU FORMATION, SOUTH EASTERN NIGERIA." International Journal of Sciences Volume 1, no. 2012-12 (2012): 107–20. https://doi.org/10.5281/zenodo.3348117.

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The Turonian Nkalagu Formation exposed at NIGERCEM (Nigerian Cement Company) within the Lower Benue Trough was studied in this work in order to determine and establish the lithostratigraphic successions and reconstruct the paleoenvironment of the deposition. Two major litho-facies were delineated. The first is matrix-supported bioclastic shell lag wackestone facies which account for about 70% of the carbonates. The second is a massive fossil-poor micritic limestone. However, using the fossil contents, five distinct micro-biofacies were recognized namely: massive lithoclastic floatstone, biocla

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Frisone, Viviana, Andrzej Pisera, and Nereo Preto. "Siliceous sponges (Porifera: Hexactinellida, Demospongiae) from Chiampo Valley (Eocene, Lessini Mts, northern Italy): taxonomy, taphonomy and paleoecology." Rendiconti online della Società Geologica Italiana 31 (July 2014): 79–80. http://dx.doi.org/10.3301/rol.2014.56.

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Hu, Zongquan, Wei Du, Chuanxiang Sun, et al. "Evolution and migration of shale facies and their control on shale gas: A case study from the Wufeng-Longmaxi Formations in the Sichuan Basin and its surroundings." Interpretation 6, no. 4 (2018): SN57—SN70. http://dx.doi.org/10.1190/int-2018-0015.1.

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The Fuling gas field, the largest commercial discovery of shale gas in China, has been producing from the organic-rich shale in the Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation in the Sichuan Basin, China. A refined shale gas E&P and sweet spots identification require studies to be carried out not only at the sedimentary facies scale but also at the petrographic scale. This paper focuses on the characteristics of organic-rich shales. Based on data from outcrops, drilling cores, X-ray diffraction, thin sections, and scanning electric microscope, a systematic analy

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Kosarev, Alexandr Michailovich, Eugenia Anatolievna Timofeeva, Gulnara Turdibaevna Shafigullina, and Sergei Anatol’ivech Danilenko. "Geodynamic settings of Silurian - Early Devonian volcanism in the north of the Sakmara zone (the Southern Urals)." Geologicheskii vestnik, no. 3 (November 10, 2023): 59–73. http://dx.doi.org/10.31084/2619-0087/2023-3-6.

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The work provides characteristics of the Karamolinsky and Blyavinsky volcanic complexes, which were identified by I.A. Smirnova, V.L. Cherkasov, V.T. Tishchenko, I.B. Seravkin in the Mednogorsk region in the rank of strata. Based on findings of graptolites in limestones and siliceous shales, intercalations among pillow basalts and massive basaltic flows, the sequence is dated as the Middle to Upper Llandoverian. Based on the presence of facies replacement of the Karamolinsky sequence with siliceous rocks of the Sakmara Formation, the age of the Karamolinsky sequence is assumed to be S–D1. The

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Guido, Diego M., Kathleen A. Campbell, Frédéric Foucher, and Frances Westall. "Life is everywhere in sinters: examples from Jurassic hot-spring environments of Argentine Patagonia." Geological Magazine 156, no. 9 (2019): 1631–38. http://dx.doi.org/10.1017/s0016756819000815.

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AbstractJurassic siliceous hot-spring (sinter) deposits from Argentine Patagonia were evaluated to determine the distribution and preservation quality of their entombed microbial fabrics. Detailed study showed that the Claudia palaeo-geothermal field hosts the best-preserved sinter apron in the Deseado Massif geological province, where we also found hot-spring silica–biotic interactions extending into hydrothermally influenced fluvial and lacustrine settings. Carbonaceous material was identified by petrography and Raman spectroscopy mapping; it is inter-laminated with silica across proximal ve

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Yi, Xuefei, Lei Zhao, Taizhong Duan, Yunfei Huang, and Bo Chen. "Shale facies from the Wufeng-Lower Longmaxi Formations in the Huangying section of Wulong County, southeastern Sichuan Basin, China." Interpretation 6, no. 4 (2018): SN133—SN151. http://dx.doi.org/10.1190/int-2018-0026.1.

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With the increasing interest on shale oil and shale gas around the world, it is essential to discover alternative economic shale gas fields outside the Fuling gas field, which is China’s first large-scale shale gas field with 100 billion cubic meters of reserves in the Sichuan Basin (China). Based on comprehensive analysis of dozens of black shale samples, the Wufeng Formation and the Lower Longmaxi Formation in the Huangying section of Wulong County showed good prospects for shale gas. An integrated study of petrology, organic geochemistry, trace element analysis, and sedimentology reveals th

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Leonova, L. V., A. A. Galeev, and A. A. Galeev. "Microfossils in bottom-hydrothermal sediments of the Saf'yanovskoe Cu-Zn deposit (Middle Urals)." LITHOSPHERE (Russia) 22, no. 3 (2022): 376–90. http://dx.doi.org/10.24930/1681-9004-2022-22-3-376-390.

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Research subject. Framboidal pyrites and sulfide micro-concretions in carbonaceous-siliceous and ore rocks of the Safyanovskoye deposit (Middle Urals). Aim. To identify the signs of vital activity of microbial communities in bottomhydrothermal deposits using the example of the Safyanovskoye sulfide deposit. The methods. Scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). Results. TThe analyzed ore and carbonaceous-siliceous rock samples showed the presence of mineralized silicon dioxide films covering framboidal pyrites. Micro-concretions were found to consist of mic

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Jurkowska, Agata Anna, and Ewa Świerczewska-Gładysz. "Opoka – a mysterious carbonate-siliceous rock: an overview of general concepts." Geology, Geophysics and Environment 48, no. 3 (2022): 257–78. http://dx.doi.org/10.7494/geol.2022.48.3.257.

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The opoka is a carbonate-siliceous marine sedimentary rock, forming a thick succession of Upper Cretaceous age in Poland and in other regions of Europe. This rock has been studied for over 150 years, but only the use of modern analytical techniques enables for the formulation of its mineralogical definition, which identifiesthe distinct features of opoka and allows it to be distinguished from other rocks (e.g. chalk, gaize). Parallel to the petrographic research on opoka, its palaeobathymetric interpretations, which were based on the palaeotectonic models of Danish-Polish Trough inversion has

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Wu, Yijia, Hongming Tang, Ying Wang, et al. "Sedimentary Facies of the Longmaxi Formation Shale Gas Reservoir in the Weiyuan Area Based on Elemental Characteristics." Geofluids 2021 (September 10, 2021): 1–17. http://dx.doi.org/10.1155/2021/5021298.

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The Lower Silurian Longmaxi Formation in the southern Sichuan Basin is composed of a series of dark carbonaceous shales deposited in a hydrostatic shelf reduction environment. In this study, the ratio of uranium to thorium (U/Th), the total organic carbon (TOC), and the biological silicon content (SiBio) were selected as the characteristic parameters to precisely analyze the sedimentary environment and its impact on reservoir quality. The results show that the Weiyuan area in the Early Silurian Longmaxi period experienced two transgression-regression cycles, forming two third-class sequences,

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Grapes, Rodney H. "Barian mica and distribution of barium in metacherts and quartzofeldspathic schists, Southern Alps, New Zealand." Mineralogical Magazine 57, no. 387 (1993): 265–72. http://dx.doi.org/10.1180/minmag.1993.057.387.09.

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AbstractZoned barian muscovite (2.52-5.66% BaO) and unzoned biotite (0.99-1.77% BaO) occur in two amphibolite grade metacherts of the Alpine schists, Southern Alps, New Zealand. The Ba-micas are associated with quartz-chlorite-Mn-garnet-tourmaline-apatite-sulphide ± oligoclase ± rutile ± magnetite ± ankerite. Increasing Ba (core to rim) in the muscovite is accompanied by a decrease in Si, Ti, Fe + Mg, and K and an increase in [4]Al, [6]Al, and Na. The main substitution that accounts for entry of Ba into both micas is [A]Ba2+ + [4]Al3+ ⇋ [A]K+ + [4]Si4+ and possibly [A]Ba2+ ⇋ [A]K+ + □. Composi

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Franseen, Evan K. "Mississippian (Osagean) Shallow-water, Mid-latitude Siliceous Sponge Spicule and Heterozoan Carbonate Facies: An Example from Kansas with Implications for Regional Controls and Distribution of Potential Reservoir Facies." Bulletin (Kansas Geological Survey), no. 252 (January 1, 2002): 1–23. https://doi.org/10.17161/kgsbulletin.no.252.20383.

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Mixtures of biosiliceous and heterozoan-dominated carbonate deposits are commonly interpreted as recording cold-water polar or deep basinal conditions. However, a growing body of literature is documenting examples from the rock record that show these deposits accumulated in shallow-water middle- to low-latitude environments. The continued recognition of ancient neritic heterozoan carbonate and biosiliceous accumulations is broadening our understanding of the various paleoenvironmental controls on their development. Early-Middle Mississippian time was characterized by the development of biosili

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Gaino, E., and M. Sara. "Siliceous spicules of Tethya seychellensis (Porifera) support the growth of a green alga: a possible light conducting system." Marine Ecology Progress Series 108 (1994): 147–51. http://dx.doi.org/10.3354/meps108147.

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