Academic literature on the topic 'Paleogeology'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Paleogeology.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Paleogeology"
1
Bluth, G. J. S., and L. R. Kump. "Phanerozoic paleogeology." American Journal of Science 291, no. 3 (March 1, 1991): 284–308. http://dx.doi.org/10.2475/ajs.291.3.284.
Full text
2
Beverley-Burton, Mary. "Origins of the Monogenea of selected major taxa of Nearctic freshwater fishes." Canadian Journal of Fisheries and Aquatic Sciences 52, S1 (August 1, 1995): 24–34. http://dx.doi.org/10.1139/f95-505.
Full textAbstract:
Comment on the origin(s) of a group of parasites requires an awareness of the paleogeology of the region and historical records – phylogenies of both hosts and their parasites. The paleogeology of the Nearctic Region is described briefly and 11 families of Nearctic freshwater fishes for which phylogenetic information is available are considered: Acipenseridae, Polyodontidae, Catostomidae, Ictaluridae, Fundulidae, Poeciliidae, Cyprinodontidae, Percidae, Centrarchidae, Moronidae, and Percopsidae. A previous hypothesis that the Nearctic ancyrocephalids are of mixed origins is supported and the phenomena of vicariance, dispersal, host-switching, and co-evolution are demonstrated.
3
CRAIG, D. A., R. A. ENGLUND, and H. Takaoka. "Simuliidae (Diptera) of the Solomon Islands: new records and species, ecology, and biogeography." Zootaxa 1328, no. 1 (October 5, 2006): 1. http://dx.doi.org/10.11646/zootaxa.1328.1.1.
Full textAbstract:
Five species of Simuliidae are reported for the first time from the Solomon Islands of Santa Isabel, Malaita, and Makira, and Kolumbangara and Rendova of the New Georgia Island group. One newspecies, Simulium (Gomphostilbia) rhopaloides Craig, Englund & Takaoka, from Guadalcanal is described. The new material consists mainly of immature larvae, which, while allowing assignment to subgenus, do not always allow identification to species. The probability of other new species is suggested. The record for Makira is the most easterly known for the subgenus Morops, as are those for Gomphostilbia from Guadalcanal and Malaita. Larval habitats on the islands are illustrated. A brief synopsis of the paleogeology of the Solomon Islands is given as a basis for preliminary comments on distribution and biogeography of the known species of Simuliidae, now 10, for the Solomon Islands.
4
Gibbs, M. T. "Global chemical erosion over the last 250 my; variations due to changes in paleogeography, paleoclimate, and paleogeology." American Journal of Science 299, no. 7-9 (November 1, 1999): 611–51. http://dx.doi.org/10.2475/ajs.299.7-9.611.
Full text
5
Payn, Kitt G., William S. Dvorak, and Alexander A. Myburg. "Chloroplast DNA phylogeography reveals the island colonisation route of Eucalyptus urophylla (Myrtaceae)." Australian Journal of Botany 55, no. 7 (2007): 673. http://dx.doi.org/10.1071/bt07056.
Full textAbstract:
We present a study of the colonisation patterns of a tropical tree species among an island archipelago. Eucalyptus urophylla (S.T.Blake) is an economically important plantation species endemic to the volcanic slopes of seven islands in eastern Indonesia. In the present study, we investigated the geographical distribution of chloroplast DNA sequence variation in E. urophylla to gain insight into its historical seed-migration routes. DNA sequence data were obtained from 198 plants from which 20 haplotypes were identified. A moderate to high level of chloroplast genetic differentiation (GST = 0.581, NST = 0.724) and significant phylogeographic structure (NST > GST; P < 0.01) were observed, suggesting low levels of recurrent seed-mediated gene flow among the islands. The highest levels of haplotype diversity were observed on the eastern islands of Wetar and Timor. The two most westerly islands, Flores and Lomblen, were fixed for what appeared to be the ancestral haplotype. Chloroplast haplotype diversity therefore exhibited a decreasing trend from east to west in the species’ range, consistent with an east-to-west colonisation route across the seven islands. Environmental factors that may have contributed to the contemporary spatial distribution of chloroplast DNA haplotypes include island paleogeology, ocean currents, fluctuations in sea levels and possible hybridisation events.
6
Horvath, P. S. "The effectiveness of offshore three‐dimensional seismic surveys—Case histories." GEOPHYSICS 50, no. 12 (December 1985): 2411–30. http://dx.doi.org/10.1190/1.1441873.
Full textAbstract:
Gulf began investigating three‐dimensional seismic surveys in the mid‐1960s through Gulf Research and Development Company. During the late 1960s, models were constructed to simulate acquisition and processing. Three‐dimensional (3-D) migration was achieved in the early 1970s, and Gulf began field testing 3-D seismic data acquisition in 1974. By 1978, 3-D seismic surveys were available as a commercial service through contractors. Some advantages that 3-D seismic surveys have over 2-D seismic surveys are: they can help refine both structure and stratigraphic interpretations; they assist in defining the paleogeology and reveal details otherwise not apparent; they help determine the reservoir limits through improved interpretation of the structure and hydrocarbon indicators; they enable the acquisition of subsurface control under surface obstructions, such as platforms, rigs, etc.; they provide the opportunity to construct profiles in any direction desired; and they lend themselves to interactive interpretation. When using 3-D seismic surveys, improved seismic resolution is expected. This in turn improves drilling success and finding new reserves, makes the development drilling program more efficient, and provides the best possible location for a wildcat survey. The results achieved in 16 3-D seismic surveys that cover 26 blocks in the offshore Gulf of Mexico reveal that offshore 3-D seismic surveys can be a cost‐effective way of finding and developing hydrocarbons.
7
Wyss, Max. "Return Times of Large Earthquakes Cannot Be Estimated Correctly from Seismicity Rates: 1906 San Francisco and 1717 Alpine Fault Ruptures." Seismological Research Letters 91, no. 4 (May 13, 2020): 2163–69. http://dx.doi.org/10.1785/0220200008.
Full textAbstract:
Abstract The unproven assumption that the Gutenberg–Richter (GR) relationship can be extrapolated to estimate the return time, Tr (1/probability of occurrence), of major and large earthquakes has been shown to be incorrect along 196 faults, so far. Here, two more examples of great, well-known faults that do not produce enough earthquakes to fulfill the hypothesis are analyzed. The 300 km section of the San Andreas fault, California, United States, that ruptured in 1906 in the M 8 San Francisco earthquake, produced 200 earthquakes with M≥2 in the last 52 yr, when about 250,000 such events are expected according to the hypothesis. Along a 250 km section that broke in an M 7.9 earthquake in 1717 along the Alpine fault, New Zealand, the number of reported M≥3.6 earthquakes during the last 34 yr was 100, when about 6000 would be expected, based on the hypothesis. Extrapolating the GR relationships for these two fault segments, one estimates Tr of mainshocks of M 8 to be about 10,000 and 100,000 for the 1717 and 1906 ruptures, respectively. Regardless of choice of analysis parameters, this is by factors of 10–400 larger than estimates based on paleogeology, tectonics, and geodesy. In addition, second catalogs for each case yield estimates of probabilities for M 8 earthquakes along the 1717 and 1906 rupture segments that differ by factors of about 2 and 80 (between 5000 and 98,000 yr) from the first respective catalogs. It follows that the probability of large earthquakes cannot be estimated correctly based on local seismicity rates along major faults.
8
Rui, Yuan, Yang Bo, Pan Chunfu, Guo Xuguang, Huang Liliang, He Wenjun, Feng Youlun, and Zhao Kang. "Conglomerate petrology characterization using high-definition borehole electrical images in the Upper Urho Formation at well JL42, Zhongguai Uplift, Junggar Basin, China." Interpretation 8, no. 3 (July 23, 2020): SL137—SL150. http://dx.doi.org/10.1190/int-2019-0243.1.
Full textAbstract:
Cores drilled from wells are significant resources for understanding the geologic characteristics of petroleum reservoirs. However, due to the high cost and long rig time involved, it is impossible to obtain cores from the entire sedimentary formation in a drilling well. Furthermore, core breakage limits the amount of information that can be obtained in the vertical deposition environment of deep-buried formations. Therefore, we have used ultrahigh-resolution and high-quality borehole electrical images obtained by a borehole electrical imaging tool, High-Definition Formation MicroImager (FMI-HD), to supplement “core” information and characterize the petrologic features, such as grain size and sedimentary structure, of conglomeratic formations in the Permian Upper Urho Formation at well JL42, Zhongguai Uplift, Junggar Basin, China. We have observed conglomeratic cores at 95.92 m in well JL42 and recorded various petrologic features of the core cylinders. In the cored interval, the FMI-HD images were compared with core photos in detail; grain size results from the FMI-HD images and cores were very similar. However, there were major differences in the structural results due to core interruption. In addition, the high-resolution depositional facies of the Upper Urho Formation at well JL42 were dissected in terms of the distributive fluvial system, not the fan-delta system, using vertical grain size features derived from FMI-HD images. Boulders, cobbles, coarse pebbles, and fine pebbles were developed in thick gravelly channels in the lower proximal facies, whereas fine pebbles and granules were developed in thin channels in the upper medial facies. Therefore, FMI-HD images can be efficiently used to supplement cores and sedimentary information, which provides important insights on the paleogeology of conglomeratic formations and in turn on the exploration potential of petroleum systems.
9
Maslyayev, G. A. "PALEOGEOLOGIC RECONSTRUCTIONS OF THE RUSSIAN PLATFORM." International Geology Review 31, no. 3 (March 1989): 217–27. http://dx.doi.org/10.1080/00206818909465873.
Full text
10
Gusev, A. V. "Some pathways and factors of monogenean microevolution." Canadian Journal of Fisheries and Aquatic Sciences 52, S1 (August 1, 1995): 52–56. http://dx.doi.org/10.1139/f95-507.
Full textAbstract:
This paper discusses probable causes for the origin and evolution of groups of monogenean congeneric sibling species infecting one fish host species, with special reference to freshwater fishes. These causes comprise strict specificity, topological differentiation of parasite micropopulations in microniches (microhabitats), ecological and geographic isolation of various parasite and host populations, paleogeographic or geomorphologic (but not paleogeologic) changes during the late Tertiary and Quaternary periods, with alternating marine transgressions and regressions acting upon continents which, after the Miocene, have been less affected by continental drift, orogenesis, and climatic fluctuations. Co-evolving with their hosts, Monogenea usually diverge faster than their hosts.
Dissertations / Theses on the topic "Paleogeology"
1
London, Jeremy Taylor. "Geologic Factors Affecting Hydrocarbon Occurrence in Paleovalleys of the Mississippian-Pennsylvanian Unconformity in the Illinois Basin." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1355.
Full textAbstract:
Paleovalleys associated with the Mississippian-Pennsylvanian unconformity have been identified as potential targets for hydrocarbon exploration in the Illinois Basin. Though there is little literature addressing the geologic factors controlling hydrocarbon accumulation in sub-Pennsylvanian paleovalleys basin-wide, much work has been done to identify the Mississippian-Pennsylvanian unconformity, characterize the Chesterian and basal Pennsylvanian lithology, map the sub-Pennsylvanian paleogeology and delineate the pre-Pennsylvanian paleovalleys in the Illinois Basin. This study uses Geographic Information Systems (GIS) to determine the geologic factors controlling the distribution of hydrocarbon-bearing sub-Pennsylvanian paleovalley fill in the Illinois Basin. A methodology was developed to identify densely-drilled areas without associated petroleum occurrence in basal Pennsylvanian paleovalley fill. Kernel density estimation was used to approximate drilling activity throughout the basin and identify “hotspots” of high well density. Pennsylvanian oil and gas fields were compared to the hotspots to identify which areas were most likely unrelated to Pennsylvanian production. Those hotspots were then compared to areas with known hydrocarbon accumulations in sub-Pennsylvanian paleovalleys to determine what varies geologically amongst these locations. Geologic differences provided insight regarding the spatial distribution of hydrocarbon-bearing sub-Pennsylvanian paleovalleys in the Illinois Basin. It was found that the distribution of hydrocarbon-bearing paleovalleys in the Illinois Basin follows structural features and faults. In the structurally dominated portions of the Illinois Basin, especially in eastern Illinois along the La Salle Anticlinal Belt, hydrocarbons migrate into paleovalleys from underlying hydrocarbon-rich sub- Pennsylvanian paleogeology. Along the fault-dominated areas, such as the Wabash, Rough Creek and Pennyrile Fault Zones, migration occurs upwards along faults from deeper sources. Cross sections were made to gain a better understanding of the paleovalley reservoir and to assess the utility of using all the data collected in this study to locate paleovalley reservoirs. The Main Consolidated Field in Crawford County, Illinois, was chosen as the best site for subsurface mapping due to its high well density, associated Pennsylvanian production, and locally incised productive Chesterian strata. Four cross sections revealed a complex paleovalley reservoir with many potential pay zones. The methodology used to locate this paleovalley reservoir can be applied to other potential sites within the Illinois Basin and to other basins as well.
2
Zheng, Xinyuan. "Oceanic cycling of rare earth elements and the application of Nd isotopes to assess changes in Mesozoic ocean circulation." Thesis, University of Oxford, 2016. http://ora.ox.ac.uk/objects/uuid:0b06129a-8f51-4421-a043-5eeb86cec972.
Full textAbstract:
Rare earth elements (REEs) and their isotopes (such as Nd isotopes) can be potentially used to trace a wide range of oceanic processes in both modern and ancient oceans, but their successful application as tracers requires a comprehensive understanding of REE cycling in the modern ocean. Previous studies of REEs in seawater were largely constrained by analytical difficulties in generating accurate and precise REE data from seawater, which typically contain REE concentrations at a sub-ppt to ppt level. A new, and relatively simple, analytical method for precise and accurate determination of all dissolved REE concentrations in reasonably small (∼100 ml) seawater samples is presented in this thesis. With the application of the new method, this thesis reports the first full-depth, zonal ocean section of all dissolved REE concentrations, collected during the CoFeMUG cruise along ∼12°S in the South Atlantic. The section approach of this study places the distribution of dissolved REE concentrations in a well-constrained hydrographic context, allowing the first quantitative assessment (by an inverse model) of the relative importance of hydrographic controls resulting from advection/mixing of ocean circulation, together with non-conservative controls resulting from local particle scavenging and remineralization, in controlling the distribution of dissolved REEs in this region. A noteworthy decoupling of Ce and Mn with respect to their cycling in the water column was also observed in this study. The application of Nd isotopes as a tracer to reconstruct changes in ocean circulation in the NW European chalk shelf sea during rapid climatic events, including the mid-Cenomanian Event and oceanic anoxic event 2 (OAE 2), suggests a tight coupling between ocean circulation and transient climatic cooling during the general warm Late Cretaceous. An advected volcanic signal during OAE 2 was registered in the seawater Nd-isotope record from the English Chalk, probably suggesting a period of enhanced ocean ventilation/mixing at this time.
3
Homens, Mário Jorge dos Santos Gustavo Mil. "O bário como indicador de paleoprodutividade em "cores" da margem continental portuguesa." Master's thesis, Universidade de Aveiro, 1997. http://hdl.handle.net/10773/16960.
Full textAbstract:
Mestrado em GeoquímicaEsta dissertação tem como principal objectivo avaliar a utilização do Bário como indicador de paleoprodutividade em "cores" de sedimentos da Margem Continental Portuguesa, e identificar as características do seu sinal a N e a S de Lisboa no período compreendido entre os O e 24ka. Com vista a atingir estes objectivos foram estudadas 141 amostras pertencentes a 4 "cores" colhidos no decorrer do cruzeiro POSEIDON200-10, dois em cada região (P028-1 e P021-1, a N de Lisboa; P08-2 e P06-2, a S de Lisboa). A selecção destes "cores" teve como base a existência de outros dados de indicadores biogénicos. A técnica de preparação de amostras utilizada foi uma fusão tipo alcalina. Como técnica instrumental foi utilizada a Espectrofotometria de Emissão Atómica de Plasma, que permitiu efectuar a determinação dos elementos maiores e em traço na amostra total. Com o objectivo de controlar a qualidade dos resultados analíticos foram efectuados estudos de precisão e de exactidão. Os primeiros tiveram por base a utilização de resultados analíticos referentes a amostras em duplicado, os quais foram projectados em gráficos de controle para avaliação da precisão analítica com o modelo de precisão de 5% (10) desenvolvido por Thompson et al., (1976). Este modelo indica que para todos os elementos maiores e alguns em traço (onde se inclui o Bário) os valores de precisão do método analítico são inferiores a 5%. No que diz respeito ao estudo de exactidão foram utilizados os dados analíticos do material geológico de referência (MESS-I), bem como os seus valores certificados. De modo a avaliar o nível de significância estatística para um p=0,05% dos vários elementos determinados foi calculado o valor do t de Student. Para o Bário não foi possível efectuar o estudo da exactidão por não ser disponível o seu valor certificado. De entre todos os elementos analisados foram escolhidos o Bário e os óxidos de Si e de Al. Ao longo dos "cores" verificou-se a existência de uma variação no comportamento do sinal do Bário mais saliente nos "cores" localizados a S de Lisboa. Como forma de tentar eliminar o efeito de diluição da contribuição terrígena no sinal do Bário biogénico foram utilizados os métodos desenvolvidos por Schmitz (1987), Dymond et al. (1992) e Rutsch et al. (1995). Os resultados obtidos por aplicação dos métodos anteriores mostram que os "cores" localizados a N de Lisboa apresentam um maior efeito de diluição do sinal biogénico que os "cores" do S. Uma possível explicação para este facto, é o da localização dos "cores" P028-1 e P021-1 se encontrar mais próxima do bordo da plataforma aquando da ocorrência do último glaciar máximo, cerca dos 18ka, originando uma maior e mais próxima contribuição de material teidgeno. Para além disso, outros factores como os diferentes tipos de relevo, o número e o tipo de rios existente podem contribuir de maneira significativa para esse efeito de diluição. Da conjugação de todos estes resultados, é possível concluir que o Bário pode ser utilizado como indicador de paieoprodutividade na Margem Continental Portuguesa, sendo no entanto, de salientar a importância da quantificação da contribuição da componente terrígena no seu sinal.
4
Shahbaz, Arslan. "Paleoenvironmental and stratigraphic reconstruction of Sado Bacin (Portugal)." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12085.
Full textAbstract:
Mestrado em Engenharia GeológicaThe Tertiary deposits of the Sado Basin (in southwestern Portugal) were deposited in a typical continental basin, composed by 4 main lithostratigraphic units. During the Palaeogene, the Sado Basin was a closed basin in which the mineralogy of the primary facies underwent significant changes that resulted in the extensive occurrence of palygorskite. The Palaeogene fill of the Sado basin is composed by reddish coarse detrital sediments (conglomerates, arkosic sandstones, clays and marly carbonates). 28 samples representative of the most exposed outcrops of these units were collected and analysed by XRD, XRF and SEM-EDS for their mineralogical and chemical characterization. SEMEDS was used to compute the crystallochemical formulas for the identified clay minerals. Clay minerals associations were used as lithostratigraphical markers as well as for paleoenvironmental reconstructions and diagenesis analyses. Palaeogene deposits are characterized by an increase on palygorskite relative amounts in the distal parts of the basin as well as by higher structural order of the clay minerals in the Miocene sediments and lower structural order in Eocene sediments, pointing to a significant diagenesis contribution.
Os depósitos terciários da Bacia do Sado (no sudoeste de Portugal) comtemplam quatro principais unidades litoestratigráficas que resultam de uma deposição típica de uma bacia continental. Durante o Paleogénico, a Bacia do Sado era uma bacia fechada em que a mineralogia da fácies primária passou por mudanças significativas, que resultou numa extensa ocorrência de paligorskite. O preenchimento paleogénico da bacia do Sado é composto por sedimentos avermelhados detríticos grosseiros (conglomerados, arcoses, argilas e margas). Foram colhidas 28 amostras representativas dos afloramentos mais expostos das referidas unidades litoestratigráficas e analisadas, do ponto de vista mineralógico e químico, por DRX, FRX, respectivamente. Recorreu-se a análises SEM-EDS para calcular as fórmulas cristaloquímicas para os minerais argilosos identificados. Os resultados obtidos permitiram estabelecer associações mineralógicas para cada unidade, principalmente no que concerne os minerais argilosos. Estas associações foram interpretadas como marcadores litostratigráficos e possibilitaram a reconstrução paleoambiental e análise diagenética da bacia do Sado. De forma geral, os depósitos paleogénicos que preenchem a Bacia do Sado são caracterizados por um incremento na quantidade relativa de paligorskite no sentido proximal-distal, bem como por um aumento da ordem estrutural dos minerais de argila na mesma unidade litoestratigráfica, o que aponta para uma contribuição diagenética relevante.
5
Santos, Ana Luísa Sebastião Rodrigues dos. "Geoquímica, mineralogia e luminescência de um mundo pré-histórico em negativo: do neolítico à idade do bronze região do Alentejo." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14828.
Full textAbstract:
Doutoramento em GeociênciasOs trabalhos de investigação arqueológica realizados nos últimos anos no Sul de Portugal têm revelado a existência de estruturas arqueológicas negativas com arquiteturas e funcionalidades inéditas, que levantaram questões quanto à sua dinâmica de preenchimento e cronologia. Estas estruturas (fossos, fossas e hipogeus) estão associadas a sociedades Pré-Históricas, do Neolítico à Idade do Bronze, e foram escavadas em formações carbonatadas e materiais de alteração de granitos, e de dioritos e gabros associados. Neste trabalho estudaram-se diferentes fracções granulométricas de materiais de preenchimento das estruturas negativas e contexto geológico com uma nova abordagem: (i) composição química (ativação neutrónica e fluorescência de raios-X), (ii) composição mineralógica (difração de raios-X), (iii) estudos de luminescência estimulada oticamente e termicamente, e (iv) datação por luminescência dos materiais de preenchimento. As diferenças encontradas na granulometria, composição química e mineralógica, nomeadamente da fração argilosa das diferentes formações estudadas, permitiram definir condições paleoambientais para os materiais de preenchimento das estruturas negativas, bem como diferenciar as formações carbonatadas: (i) calcretos freáticos, (ii) calcretos lacustes (jovens/maduros e pobres/ricos em Mg) e (iii) formações detríticas carbonatadas. Os resultados da luminescência combinados com os da mineralogia e geoquímica (complementando os da arqueologia) permitiram contribuir para a identificação de diferentes fases na sequência de preenchimento das estruturas, a proveniência dos materiais e o tipo de relação com o substrato geológico, destacando-se o papel dos elementos traço, particularmente das terras raras. A datação por luminescência confirmou em alguns casos a sequência cronológica estabelecida pela interpretação arqueológica. Contudo, verificou-se que em outras situações a idade de luminescência foi afectada por uma grande contribuição de materiais geológicos e/ou pela presença de calcite. Para atenuar o efeito da calcite propõe-se uma nova abordagem metodológica para o cálculo da taxa de dose, permitindo re-interpretar as idades determinadas. Desta forma, contribuiu-se para o conhecimento da composição e comportamento de amostras de natureza geológica sujeitas a processos de meteorização naturais e antrópicos, numa perspectiva interdisciplinar para uma melhor compreensão de um “mundo Pré-Histórico negativo” na região do Alentejo.
Archaeological research developed in recent years in South Portugal has revealed negative archaeological structures with original architectures and features, posing questions related to their chronology and fill dynamics. These structures (ditches, pits and hypogeum) have been excavated in carbonate-rich rocks and materials derived by weathering of granites, diorites and associated gabbros. They are related with Pre-Historic societies, from the Neolithic through the Bronze Age. In this work, different granulometric fractions of the fill materials of the negative structures and geological contexts have been studied by an innovative approach comprising: (i) chemical composition (neutron activation analysis and X-ray fluorescence), (ii) mineralogical composition (X-ray diffraction), (iii) thermo and optically stimulated luminescence profiling, and (iv) luminescence dating of fill materials. Results found for granulometry, chemical and mineralogical composition, particularly of the clay fraction, enable differentiation of the paleoenvironments of the fill materials, as well as classification of the carbonate-rich materials: (i) phreatic calcretes, (ii) lacustrine calcretes (young/mature and poor/rich in Mg) and (iii) carbonate detrital formations. Luminescence together with geochemical and mineralogical results (complementing archaeological ones) contributed to the identification of different phases in the stratigraphic sequence, materials provenance and relation with the geological background, with particular emphasis in the role of trace elements, namely rare earth elements. Luminescence dating is often in accordance with archaeological interpretations of stratigraphy. Nevertheless calcite and/or the contribution of geological materials disturb the obtained age. In order to attenuate the effect of calcite, a new methodological approach is proposed in this work for the dose rate estimation, allowing a re-interpretation of the obtained age. Thus this work contributes to better establish behaviour of geological materials subjected to natural and anthropogenic weathering effects, in an interdisciplinary point of view, and better understanding the “negative Pre-Historical world” in the Alentejo region.
6
Bluth, Gregg Jon Seymour. "Effects of paleogeology, chemical weathering, and climate on the global geochemical cycle of carbon dioxide." 1990. http://catalog.hathitrust.org/api/volumes/oclc/48421833.html.
Full text
7
Ned, Allison Marie. "Dynamic stratigraphy and sediment partitioning of high-supply fluvial succession in Maastrichtian source-to-sink system." 2013. http://hdl.handle.net/2152/21834.
Full textAbstract:
The sediment budget and paleogeography was reconstructed for the Maastrichtian fluvial to coastal plain Lance Formation (>200m thick) that developed coevally with the shoreline/shelf Fox Hills Sandstone (>200m thick) and deep-water Lewis Shale (>750m thick) in a complete source-to-sink system in the Washakie and Great Divide Basins of south central Wyoming. The system initiated during the final Western Interior Seaway (WIS) transgression and the onset of the Laramide Orogeny rapid subsidence (>2km in 1.9 My) that largely outpaced sediment flux into the basin so the system became and remained a deep-water (>500m water depth) basin beyond the Lance-Fox Hills shelf prism. The active tectonic setting and rapid subsidence caused the Lance fluvial and coastal plain deposits to aggrade and accumulate behind the generally rising shoreline trajectory of the Fox Hills Sandstone. The depositional succession is subdivided into 15 clinothem units and the Lance Formation is best exposed in outcrops in clinoforms 10, 11, and 12. Subsurface analysis correlates key stratigraphic surfaces across the basin to define the sediment budget and clinoform architecture. Field analysis along clinoform 12 on the east side of the basin details facies and paleohydraulic dimensions. Sediment partitioning shows the regressive and transgressive systems tracts (RST and TST) form complementary wedges such that the RST thickens basinward and the TST thins basinward, reflecting the preferential storage of sediment. Channels measured in the field and subsurface datasets are similar in thickness (2m-16m) and suggest braided channel morphology with channel belts from 6.2-8.4km. N/NE paleocurrent trends departing from the subsurface dataset and previous studies of the system provide evidence of possible tidal influences in a developed shoreline embayment or an east to west supply from the basement-cored Rawlins and Sierra Madre Uplifts in the east. The fluvial Lance Formation paleogeography associated with the RST and TST is primarily driven both by modest, Late Cretaceous relative sea level changes and sediment supply linked to the tectonic setting and climate.text
8
Sterli, Juliana. "Sistemática y paleobiogeografía de las tortugas continentales del Jurásico de Patagonia." Tesis, 2010. http://hdl.handle.net/10915/4315.
Full textAbstract:
Los objetivos de la presente Tesis fueron estudiar la anatomía de las tortugas del Jurásico continental de Patagonia, establecer sus relaciones filogenéticas dentro del grupo y comparar los resultados con la paleogeografía de la época. Se conocen, hasta el momento, tres localidades en Patagonia con restos de tortugas continentales del Jurásico, todas ellas ubicadas en la provincia de Chubut en las cercanías de la villa de Cerro Cóndor. Dos localidades están ubicadas en afloramientos de la Formación Cañadón Asfalto (Queso Rallado y El Bagual), mientras que la tercera lo está en afloramientos de la Formación Cañadón Calcáreo (Estancia Dionide Mesa). Los restos más completos y diagnósticos se recuperaron de la localidad Queso Rallado y los mismos fueron identificados como una nueva especie, Condorchelys antiqua Sterli 2008, la cual presenta una combinación de caracteres plesiomórficos y apomórficos. Los restos hallados en las otras localidades son fragmentarios, lo cual no permite una asignación taxonómica muy precisa.
Para establecer las relaciones filogenéticas de Condorchelys antiqua, se realizaron varios análisis filogenéticos, uno de ellos considerando datos morfológicos solamente, otro considerando tantos los datos morfológicos como los moleculares en forma conjunta (análisis de evidencia total) y otros analizando cada tipo de dato por separado para poder determinar la señal filegenética aportada por cada uno. Los resultados, tanto morfológicos solos como los de evidencia total, muestran que C. antiqua es un tortuga del ‘stem’, o sea que no pertenece a ninguno de los dos grupos modernos de tortugas, Pleurodira y Cryptodira (Testudines sensu Joyce et al., 2004). Estos resultados también sugieren que el ‘crown group’ Testudines se originó en el Jurásico Medio, pero no fue hasta el Jurásico Tardío y Cretácico Temprano que se produjo la radiación de los grupos modernos. Esta radiación, que es evidenciada tanto por los datos morfológicos como por los moleculares, es coincidente con ciertas modificaciones producidas en el cráneo de las tortugas y con la aparición de los procesos trocleares, los cuales funcionan como una polea para el músculo aductor mandibular. Todos estos cambios en el cráneo están íntimamente relacionados con la alimentación. Evidencias adicionales provenientes desde la paleoclimatología y desde la paleogeografía sugieren que durante el Jurásico Tardío, el clima en la Tierra se vio afectado por un descenso de las temperaturas medias, provocando probablemente cambios en la flora y fauna del planeta y por ende cambios en los hábitos alimenticios de los animales. Ésto es coincidente con la aparición de los procesos trocleares y la radiación de los grupos modernos de Testudines.
Book chapters on the topic "Paleogeology"
1
Hay, William W., and Christopher N. Wold. "Mass-Balanced Reconstruction of Paleogeology." In Computer Applications in the Earth Sciences, 101–13. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2826-5_8.
Full text
2
Powell, Robert E. "Chapter 1: Balanced palinspastic reconstruction of pre-late Cenozoic paleogeology, southern California: Geologic and kinematic constraints on evolution of the San Andreas fault system." In Geological Society of America Memoirs, 1–106. Geological Society of America, 1993. http://dx.doi.org/10.1130/mem178-p1.
Full text
3
Rodgers, David W., and Susanne U. Janecke. "Chapter 3: Tertiary paleogeologic maps of the western Idaho-Wyoming-Montana thrust belt." In Geological Society of America Memoirs, 83–94. Geological Society of America, 1992. http://dx.doi.org/10.1130/mem179-p83.
Full textConference papers on the topic "Paleogeology"
1
Ozdoyev, Sultan, Victor Popov, Nurbol Tileuberdi, and Ma Huadong. "THE BALKHASH DEPRESSION SEDIMENT PALEOGEOLOGY AND OIL-GAS PROSPECTS." In 20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020. STEF92 Technology, 2020. http://dx.doi.org/10.5593/sgem2020/1.2/s06.102.
Full text
2
Lobanov, Stanislav A. "PALEOGEOLOGIC METHOD OF CALCULATION OF THE HEAT CONDUCTIVITY COEFFICIENT OF SOILS." In 13th SGEM GeoConference on WATER RESOURCES. FOREST, MARINE AND OCEAN ECOSYSTEMS. Stef92 Technology, 2013. http://dx.doi.org/10.5593/sgem2013/bc3/s13.017.
Full text
3
Powell, Robert E. "PALEOGEOLOGIC PATTERNS, CRUSTAL BLOCKS, AND EVOLUTION OF THE SAN ANDREAS FAULT SYSTEM IN SOUTHERN CALIFORNIA." In Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-313778.
Full text