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Silurian-Devonian and Jurassic Thermal Events in the Ordos Basin, China: Indications from k-ar dating on Illites

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Acta Geologica Sinica(English Edition) 1996年第4期70卷 435-446页

作者： Hans Ahrendt klaus Wemmer Hans-J rgen Behr Institute of Geology and Dynamics of Lithosphere University of Gttingen G ttingen GermanyInstitute of Geology and Dynamics of LithosphereUniversity of Gttingen G ttingen GermanyInstitute of Geology and Dynamics of LithosphereUniversity of Gttingen G ttingen Germany

In the Ordos basin, two distinct thermal events of different ages have been identified for the first time by means of k-ar dating combined with illite crystallinity analysis. For the Late Triassic and Late Permian samples, the k-ar ages of the k-ar ages of the are interpreted as mixed ages of detrital material and authigenic illites. The k-ar ages of both arliest granite intrusion in the northern Caledonian Qinling fold zone (380-420 Ma) and show a thermal event during Silurian-Devonian time.

关键词： illite k-ar dating illite crystallinity thermal event Ordos basin

k-ar dating of Authigenic Illites and Its Applications to the Study of Hydrocarbon Charging Histories of Typical Sandstone Reservoirs in Tarim Basin, China

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Petroleum Science 2005年第2期2卷 12-24,81页

作者： ZhangYouyu HorstZwingmann AndrewTodd Liukeyu LuoXiuquan ResearchInstituteofPetroleumExplorationandDevelopment（RIPED） Beijing100083China／／KeyLaboratoryforHydrocarbonReservoirsChinaNationalPetroleumCorporation（CNPC）Beijing100083China CSIROPetroleumResources POBox1130BentleyWA6102Australia ResearchInstituteofPetroleumExplorationandDevelopment（RIPED） Beijing100083China

The Tarim Basin in China comprises eight sets of sandstone reservoirs, five of which are investigated in detail in this study. The main purpose of this study is to investigate the hydrocarbon charging histories of reservoirs by applying k-ar dating of authigenic illites. The ages of authigenic illites from the Lower Silurian bituminous sandstones in the Central Uplift area range from 383.5 to 235.2 Ma, suggesting that the Silurian oil accumulations were formed from the late Caledonian till the late Hercynian. The ages of authigenic illites from the Upper Devonian Donghe Sandstone reservoirs range from 263.8 to 231.3 Ma, indicating that hydrocarbon accumulations within the Donghe sandstone were formed mainly in the late Hercynian. The authigenic illites ages from the Lower Jurassic Yangxia Group sandstones in the Yinan-2 gas reservoir (Yinan-2, kuqa Depression) range from 28.1 to 23.9 Ma, suggesting that the initial hydrocarbon charging occurred in the Miocene. The ages of the authigenic illites from the Lower Cretaceous sandstones in the Akemomu gas field (Ake-1, kashi Sag, Southwest Depression) range from 22.6 to 18.8 Ma, indicating a probable early oil accumulation or early migration of hydrocarbon within this area. The illites from the Paleogene sandstones in the Dina-2 gas reservoir (Dina-201, kuqa Depression) have a detrital origin; they cannot be used to study the hydrocarbon charging histories. The ages of authigenic illites in the underlying Cretaceous sandstones in the same well (Dina-201) range from 25.5 to 15.5 Ma, indicating that hydrocarbon charging in this reservoir probably occurred within the Miocene. This study highlights the potential of applying k-ar dating of authigenic illites to investigate the timing of hydrocarbon charging histories of the Tarim Basin reservoir sandstones.

关键词： k-ar dating authigenic illite hydrocarbon charge sandstone reservoirs Tarim Basin

Chronological dating and tectonic implications of late Cenozoic volcanic rocks and lacustrine sequence in Oiyug Basin of southern Tibet

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Chronological dating and tectonic implications of late Cenoz...

蒙古khuvsgul湖HDP09湖芯中地下玄武岩的k-ar年龄:对贝加尔裂谷起始时间的估计（英文）

中国科学院地质与地球物理研究所2008学术年会

作者： CHEN HeHai~(1,2),HAN JingTai~(1+),DING ZhongLi~1,SUN HuiGuo~1 & GUO ZhengFu~1 1 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 Beilun Entry-exit Inspection and Quarantine Bureau of China,Ningbo 315800,China

Reconstruction of uplift history of the Tibetan Plateau is crucial for understanding its environmental *** Oiyug Basin in southern Tibet contains multiple periods of sedimentary sequences and volcanic rocks that span much of the Cenozoic and has great potential for further studying this issue. However,these strata were poorly *** paper presents a chronological study of the 145 m thick and horizontally-distributed lacustrine sequence using paleomagnetic method as well as a k-ar dating of the underlying volcanic *** on these dating results,a chronostratigraphic framework and the basin-developmental history have been established for the past 15 Ma,during which three tectonic stages are *** period of 15—8.1 Ma is characterized by intense volcanic activities involving at least three major ***,the basin came into a tectonically quiescent period and a lacustrine sedimentary sequence was *** 2.5 Ma,an N-S fault occurred across the southern margin of the basin,leading to the disappearance of the lake environment and the development of the Oiyug *** Gyirong basin on northern slope of the Himalayas shows a similar basin developmental history and thus there is a good agreement in tectonic activities between the Himalayan and Gangdise orogenic ***,the tectonic evolution stages experienced by the Oiyug Basin during the past 15 Ma could have a regional significance for southern *** chronological data obtained from this study may provide some constraints for further studies with regard to the tectonic processes and environmental changes in southern Tibetan Plateau.

关键词： southern Tibet Oiyug Basin late Cenozoic paleomagnetic dating k-ar dating

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地球环境学报 2011年第3期2卷 462-466页

作者： HASEBE Noriko ITO kazumi HASEBE Akihiro NarANTSETSEG Ts OYUNCHIMEG Ts IVANOV Egor V kASHIWAYA kenji Institute of Nature and Environmental Technology Kanazawa University Frontier Science Organization Kanazawa University Institute of Geology and Mineral Resources MAS Institute of Geochemistry Siberia Branch of RAS

HDP09 core drilled in Lake khuvsgul,Mongoria,at 50°52'48 'N,100°26'30' E where the water depth is 222.25 m reached to the depth of ~60 m below lake floor in *** bottom part of the core consists of alkali *** basalt consists of the basement of the lake khuvsgul based on its bulk chemistry and core position plotted on the seismic profile.k-ar age of the basalt is(8.5±0.2) Ma,which is concordant with the on-land basalt distributed in the eastern part of the lake,and implies the maximum age of the Lake khuvsgul formation.

关键词： Lake khuvsgul Baikal rift zone alkali basalt k-ar dating