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Juye Shi - One of the best experts on this subject based on the ideXlab platform.
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depositional process and astronomical forcing model of lacustrine fine grained Sedimentary Rocks a case study of the early paleogene in the dongying sag bohai bay basin
Marine and Petroleum Geology, 2020Co-Authors: Juye Shi, Zhijun Jin, Quanyou Liu, Zhenkai HuangAbstract:Abstract The Paleogene strata of the Bohai Bay Basin include multiple sets of lacustrine fine-grained sediments, which provide a detailed record of the climate changes that occurred in the lake basin. Early Paleogene fine-grained Sedimentary Rocks are the main target layers of continental shale oil exploration in eastern China. Therefore, studies of the geological responses to astronomical factors have important theoretical and practical significance for understanding the depositional process of lacustrine fine-grained Sedimentary Rocks. In this paper, we focus on the lower Es3 (Es3l)-upper Es4 (Es4u) units in four shale oil wells in the Dongying Sag of the Bohai Bay Basin. Based on the previous establishment of a high-resolution astronomical time scale in this area, we have further studied the petrological characteristics and lithofacies of the fine-grained Sedimentary Rocks. Then the geological responses to astronomical cycles on different scales are investigated, and the models for the depositional process of fine-grained Sedimentary Rocks under the control of astronomical factors are revealed. The results indicate that the cyclic changes in mineral content and lithofacies in fine-grained Sedimentary Rocks in the Dongying Sag are controlled by short eccentricity and precession cycles. Periods near the maximum short eccentricity range had large precession amplitudes, humid climates, and the development of organic-rich laminated calcareous mudstone lithofacies. In contrast, periods near the minimum short eccentricity range had small precession amplitudes, a dry climates, and the development of organic-containing layered muddy limestone lithofacies. This study explores the depositional process of fine-grained Sedimentary Rocks from the perspective of astronomical cycles, which is conducive to the comprehensive prediction of favorable shale oil layers.
Zhenkai Huang - One of the best experts on this subject based on the ideXlab platform.
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depositional process and astronomical forcing model of lacustrine fine grained Sedimentary Rocks a case study of the early paleogene in the dongying sag bohai bay basin
Marine and Petroleum Geology, 2020Co-Authors: Juye Shi, Zhijun Jin, Quanyou Liu, Zhenkai HuangAbstract:Abstract The Paleogene strata of the Bohai Bay Basin include multiple sets of lacustrine fine-grained sediments, which provide a detailed record of the climate changes that occurred in the lake basin. Early Paleogene fine-grained Sedimentary Rocks are the main target layers of continental shale oil exploration in eastern China. Therefore, studies of the geological responses to astronomical factors have important theoretical and practical significance for understanding the depositional process of lacustrine fine-grained Sedimentary Rocks. In this paper, we focus on the lower Es3 (Es3l)-upper Es4 (Es4u) units in four shale oil wells in the Dongying Sag of the Bohai Bay Basin. Based on the previous establishment of a high-resolution astronomical time scale in this area, we have further studied the petrological characteristics and lithofacies of the fine-grained Sedimentary Rocks. Then the geological responses to astronomical cycles on different scales are investigated, and the models for the depositional process of fine-grained Sedimentary Rocks under the control of astronomical factors are revealed. The results indicate that the cyclic changes in mineral content and lithofacies in fine-grained Sedimentary Rocks in the Dongying Sag are controlled by short eccentricity and precession cycles. Periods near the maximum short eccentricity range had large precession amplitudes, humid climates, and the development of organic-rich laminated calcareous mudstone lithofacies. In contrast, periods near the minimum short eccentricity range had small precession amplitudes, a dry climates, and the development of organic-containing layered muddy limestone lithofacies. This study explores the depositional process of fine-grained Sedimentary Rocks from the perspective of astronomical cycles, which is conducive to the comprehensive prediction of favorable shale oil layers.
Hallo Erwa - One of the best experts on this subject based on the ideXlab platform.
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Inclination shallowing in Eocene Linzizong Sedimentary Rocks from Southern Tibet: correction, possible causes and implications for reconstructing the India-Asia collision
'Oxford University Press (OUP)', 2013Co-Authors: Huang Wentao, Dupont-nive Guillaume, Lippe Pete, Van Hinsbergen, Douwe J.j., Hallo ErwaAbstract:International audienceA systematic bias towards low palaeomagnetic inclination recorded in clastic sediments, that is, inclination shallowing, has been recognized and studied for decades. Identification, understanding and correction of this inclination shallowing are critical for palaeogeographic reconstructions, particularly those used in climatemodels and to date collisional events in convergent orogenic systems, such as those surrounding the Neotethys. Here we report palaeomagnetic inclinations from the Sedimentary Eocene upper Linzizong Group of Southern Tibet that are ∼20◦ lower than conformable underlying volcanic units. At face value, the palaeomagnetic results from these Sedimentary Rocks suggest the southern margin of Asia was located ∼10◦N, which is inconsistent with recent reviews of the palaeolatitude of Southern Tibet. We apply two different correction methods to estimate the magnitude of inclination shallowing independently from the volcanics. The mean inclination is corrected from 20.5◦ to 40.0◦ within 95 per cent confidence limits between 33.1◦ and 49.5◦ by the elongation/inclination (E/I) correction method; an anisotropy-based inclination correction method steepens the mean inclination to 41.3 ± 3.3◦ after a curve fitting- determined particle anisotropy of 1.39 is applied. These corrected inclinations are statistically indistinguishable from the well-determined 40.3 ± 4.5o mean inclination of the underlying volcanic Rocks that provides an independent check on the validity of these correction methods. Our results show that inclination shallowing in Sedimentary Rocks can be corrected. Careful inspection of stratigraphic variations of rock magnetic properties and remanence anisotropy suggests shallowing was caused mainly by a combination of syn- and post-depositional processes such as particle imbrication and Sedimentary compaction that vary in importance throughout the section. Palaeolatitudes calculated from palaeomagnetic directions from Eocene Sedimentary Rocks of the upper Linzizong Group that have corrected for inclination shallowing are consistent with palaeolatitude history of the Lhasa terrane, and suggest that the India-Asia collision began at ∼20◦N by 45-55 M
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Inclination shallowing in Eocene Linzizong Sedimentary Rocks from Southern Tibet: correction, possible causes and implications for reconstructing the India-Asia collision
geophysical journal international, 2013Co-Authors: Huang Wentao, Dupont-nive Guillaume, Lippert, Pete C., Van Hinsbergen, Douwe J. J., Hallo ErwaAbstract:A systematic bias towards low palaeomagnetic inclination recorded in clastic sediments, that is, inclination shallowing, has been recognized and studied for decades. Identification, understanding and correction of this inclination shallowing are critical for palaeogeographic reconstructions, particularly those used in climate models and to date collisional events in convergent orogenic systems, such as those surrounding the Neotethys. Here we report palaeomagnetic inclinations from the Sedimentary Eocene upper Linzizong Group of Southern Tibet that are similar to 20 degrees lower than conformable underlying volcanic units. At face value, the palaeomagnetic results from these Sedimentary Rocks suggest the southern margin of Asia was located similar to 10 degrees N, which is inconsistent with recent reviews of the palaeolatitude of Southern Tibet. We apply two different correction methods to estimate the magnitude of inclination shallowing independently from the volcanics. The mean inclination is corrected from 20.5 degrees to 40.0 degrees within 95 per cent confidence limits between 33.1 degrees and 49.5 degrees by the elongation/inclination (E/I) correction method; an anisotropy-based inclination correction method steepens the mean inclination to 41.3 +/- 3.3 degrees after a curve fitting- determined particle anisotropy of 1.39 is applied. These corrected inclinations are statistically indistinguishable from the well-determined 40.3 +/- 4.5 boolean OR mean inclination of the underlying volcanic Rocks that provides an independent check on the validity of these correction methods. Our results show that inclination shallowing in Sedimentary Rocks can be corrected. Careful inspection of stratigraphic variations of rock magnetic properties and remanence anisotropy suggests shallowing was caused mainly by a combination of syn- and post-depositional processes such as particle imbrication and Sedimentary compaction that vary in importance throughout the section. Palaeolatitudes calculated from palaeomagnetic directions from Eocene Sedimentary Rocks of the upper Linzizong Group that have corrected for inclination shallowing are consistent with palaeolatitude history of the Lhasa terrane, and suggest that the India-Asia collision began at similar to 20 degrees N by 45-55 Ma.Geochemistry & GeophysicsSCI(E)EI10ARTICLE31390-141119
Huang Wentao - One of the best experts on this subject based on the ideXlab platform.
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Inclination shallowing in Eocene Linzizong Sedimentary Rocks from Southern Tibet: correction, possible causes and implications for reconstructing the India-Asia collision
'Oxford University Press (OUP)', 2013Co-Authors: Huang Wentao, Dupont-nive Guillaume, Lippe Pete, Van Hinsbergen, Douwe J.j., Hallo ErwaAbstract:International audienceA systematic bias towards low palaeomagnetic inclination recorded in clastic sediments, that is, inclination shallowing, has been recognized and studied for decades. Identification, understanding and correction of this inclination shallowing are critical for palaeogeographic reconstructions, particularly those used in climatemodels and to date collisional events in convergent orogenic systems, such as those surrounding the Neotethys. Here we report palaeomagnetic inclinations from the Sedimentary Eocene upper Linzizong Group of Southern Tibet that are ∼20◦ lower than conformable underlying volcanic units. At face value, the palaeomagnetic results from these Sedimentary Rocks suggest the southern margin of Asia was located ∼10◦N, which is inconsistent with recent reviews of the palaeolatitude of Southern Tibet. We apply two different correction methods to estimate the magnitude of inclination shallowing independently from the volcanics. The mean inclination is corrected from 20.5◦ to 40.0◦ within 95 per cent confidence limits between 33.1◦ and 49.5◦ by the elongation/inclination (E/I) correction method; an anisotropy-based inclination correction method steepens the mean inclination to 41.3 ± 3.3◦ after a curve fitting- determined particle anisotropy of 1.39 is applied. These corrected inclinations are statistically indistinguishable from the well-determined 40.3 ± 4.5o mean inclination of the underlying volcanic Rocks that provides an independent check on the validity of these correction methods. Our results show that inclination shallowing in Sedimentary Rocks can be corrected. Careful inspection of stratigraphic variations of rock magnetic properties and remanence anisotropy suggests shallowing was caused mainly by a combination of syn- and post-depositional processes such as particle imbrication and Sedimentary compaction that vary in importance throughout the section. Palaeolatitudes calculated from palaeomagnetic directions from Eocene Sedimentary Rocks of the upper Linzizong Group that have corrected for inclination shallowing are consistent with palaeolatitude history of the Lhasa terrane, and suggest that the India-Asia collision began at ∼20◦N by 45-55 M
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Inclination shallowing in Eocene Linzizong Sedimentary Rocks from Southern Tibet: correction, possible causes and implications for reconstructing the India-Asia collision
geophysical journal international, 2013Co-Authors: Huang Wentao, Dupont-nive Guillaume, Lippert, Pete C., Van Hinsbergen, Douwe J. J., Hallo ErwaAbstract:A systematic bias towards low palaeomagnetic inclination recorded in clastic sediments, that is, inclination shallowing, has been recognized and studied for decades. Identification, understanding and correction of this inclination shallowing are critical for palaeogeographic reconstructions, particularly those used in climate models and to date collisional events in convergent orogenic systems, such as those surrounding the Neotethys. Here we report palaeomagnetic inclinations from the Sedimentary Eocene upper Linzizong Group of Southern Tibet that are similar to 20 degrees lower than conformable underlying volcanic units. At face value, the palaeomagnetic results from these Sedimentary Rocks suggest the southern margin of Asia was located similar to 10 degrees N, which is inconsistent with recent reviews of the palaeolatitude of Southern Tibet. We apply two different correction methods to estimate the magnitude of inclination shallowing independently from the volcanics. The mean inclination is corrected from 20.5 degrees to 40.0 degrees within 95 per cent confidence limits between 33.1 degrees and 49.5 degrees by the elongation/inclination (E/I) correction method; an anisotropy-based inclination correction method steepens the mean inclination to 41.3 +/- 3.3 degrees after a curve fitting- determined particle anisotropy of 1.39 is applied. These corrected inclinations are statistically indistinguishable from the well-determined 40.3 +/- 4.5 boolean OR mean inclination of the underlying volcanic Rocks that provides an independent check on the validity of these correction methods. Our results show that inclination shallowing in Sedimentary Rocks can be corrected. Careful inspection of stratigraphic variations of rock magnetic properties and remanence anisotropy suggests shallowing was caused mainly by a combination of syn- and post-depositional processes such as particle imbrication and Sedimentary compaction that vary in importance throughout the section. Palaeolatitudes calculated from palaeomagnetic directions from Eocene Sedimentary Rocks of the upper Linzizong Group that have corrected for inclination shallowing are consistent with palaeolatitude history of the Lhasa terrane, and suggest that the India-Asia collision began at similar to 20 degrees N by 45-55 Ma.Geochemistry & GeophysicsSCI(E)EI10ARTICLE31390-141119
Elena S Rubanova - One of the best experts on this subject based on the ideXlab platform.
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geochemical study of the cambrian ordovician meta Sedimentary Rocks from the northern altai mongolian terrane northwestern central asian orogenic belt implications on the provenance and tectonic setting
Journal of Asian Earth Sciences, 2014Co-Authors: Ming Chen, Guochun Zhao, M M Buslov, Elena S RubanovaAbstract:Abstract The Altai-Mongolian terrane (AM) is a key component of the Central Asian Orogenic Belt (CAOB), but its tectonic nature has been poorly constrained. This paper reports geochemical compositions of Cambrian–Ordovician meta-Sedimentary Rocks from the northern AM to trace their source nature and depositional setting, which in turn place constraints on the geodynamic evolution of the AM. The Cambrian–Ordovician meta-Sedimentary Rocks from the northern AM show variable major-element compositions, with negative correlation between SiO2 and TiO2, Al2O3, Fe2O3T, MgO and K2O. Their high ICV values (1.18–2.53) and relatively low CIA values (37.9–76.3) indicate that the sediments were immature and probably underwent mild to moderate chemical weathering. The low-SiO2 samples are characterized by relatively restricted SiO2/Al2O3 (mostly 2.60–6.07) and low Rb/Sr ratios (0.02–1.89), implying their proximal deposition without obvious Sedimentary sorting and recycling. In contrast, the high-SiO2 samples show much higher SiO2/Al2O3 ratios (15.4–19.9) possibly due to Sedimentary sorting and/or silicification. All these samples yield relatively high Al2O3/TiO2 ratios (15.6–22.8), strong LREEs/HREEs differentiation ((La/Yb)N = 4.86–10.7) and obvious negative Eu anomalies (δEu = 0.61–0.83). Combined with their Th/Sc, Zr/Sc, La/Th and Co/Th ratios comparable with intermediate-acidic magmatic Rocks, we infer that these kinds of magmatic Rocks served as a major source for the investigated meta-Sedimentary Rocks. The TiO2, Al2O3 and Fe2O3T + MgO concentrations are mostly higher than typical sediments from passive margin, and the Th/U, La/Sc, Th/Sc, Eu/Eu∗, Zr/Hf, Zr/Th and La/Th ratios are quite similar to sediments from continental arcs. These data suggest that the Cambrian–Ordovician meta-Sedimentary Rocks from the northern AM were most likely deposited in an environment related to a continental arc setting rather than a passive regime. These Rocks show strong similarities to their counterparts in the Chinese Altai (CA, southern AM) and Tseel terrane (southeastern extension of the CA in western Mongolia) in terms of geochemical compositions and depositional setting. With combination of recent isotopic studies for detrital zircons, our data suggest that the AM probably represented a coherent accretionary prism along a continental arc in the early Paleozoic.
