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Geochemical characteristics of organic matter-rich strata of lower Cambrian in Tarim Basin and its origin

Science China Earth Sciences 2004年第Z2期47卷 125-132页

作者： CHEN Jianfa1, SUN Shengli2, LIU Wenhui3 & ZHENG Jianjing3 1. Petroleum University, Beijing 102249, China 2. Zhanjiang Ocean University, Zhanjiang 524025, China 3. Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China Petroleum University Beijing 102249 China Zhanjiang Ocean University Zhanjiang 524025 China Lanzhou Institute of Geology Chinese Academy of Sciences Lanzhou 730000 China

The organic matter-rich strata of the Yurtusi Formation of Lower Cambrian are wildly spread and steady in the Tarim Basin, in which cherts are developed, companied with phos-phorite. Al/(Al+Fe+Mn) ratio and Si/(Si+Al+Fe) ratio of cherts range from 0.0023 to 0.0046 and 0.965 to 0.98, respectively, suggesting that cherts are formed in submarine hydrothermal activity and far away from terrestrial. Trace elements, such as As, Hg, Pb, Zn, Cu, Co, P, V, Ba, etc., are markedly rich in organic matter-rich sedimentary rocks of which Ba/Sr ratios are between 21.2 and 158.1. Compared with modern hydrothermal sediments, their Ba/Sr ratios are similar, it in-dicates that the organic matter-rich strata have the geochemical feature of submarine hydro-thermal sediments. The total content of rare earth elements (SREE) in cherts is from 8.81 to 56.682 mg/g, on average 31.41 mg/g and the SREE of cherts is between continental margin cherts and abyssal cherts. The LREE/HREE ratio of cherts varies from 1.01 to 3.56, which re-veals the characteristics of hydrothermal sediments. There is positive correlation between the total organic content (TOC) and Ba/Sr ratio which is geochemical index of submarine hydro-thermal activity, which indicates that the submarine hydrothermal activity obviously influences the richness of organic matter in the Yurtusi Formation.

关键词： Tarim Basin, Yurtusi Formation, organic matter-rich strata, submarine hydrothermal activity.

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A New Inversion Method of Sedimentary strata For Deriving Double Parameters and Its Applications

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Global Geology 2002年第1期7卷 79-88页

作者： GUO Hua, LIU Cai, LI Yue and YANG Baojun(College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, P. R. China) College of Geo - exploration Science and Technology Jilin University Changchun130026 P. R. China

The inverse problem of wave equation is the importance of study not only in seismic prospecting but also in applied mathematics. With the development of the research, the inverse methods of 1 - D wave equations have been trending towards the multiple parameters inversion . We have obtained an inverse method with double -parameter, in which medium density and wave velocity can be derived simultaneously. In this paper, to increase the inverse accuracy, the method is improved as follows. Firstly, the formula in which the Green Function is omitted are derived and used. Secondly, the regularizing method is reasonable used by choosing the stable function. With the new method, we may derive elastic parameter and medium density or medium density and wave velocity. Thus, lithology parameters for seismic prospecting may be *** comparing the derived values from the new method with that from previous method, we obtain the new method through which substantially improve the derived accuracy . The new method has been applied to real depths inversion for sedimentary strata and volcanic rock strata in Chaoyanggou Terrace of Songliao Basin in eastern China. According to the inverse results,the gas - bearing beds are determlned.

关键词： Sedimentary strata, Double - Parameter inversion, Green function, Regularization method, Fredholm integral equation of the first kind, Volcanic rock strata

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Discovery of Paleogene marine stratum along the southern side of Yarlung-Zangbo suture zone and its implications in tectonics

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Science China Earth Sciences 2005年第5期48卷 647-661页

作者： LI Guobiao 1 , WAN Xiaoqiao 1 , LIU Wencan 1 , LIANG Dingyi 1 & Hyesu Yun 2 1. China University of Geosciences, Beijing 100083, China 2. Chungnam National University, Daejon, 305-350, Korea China University of Geosciences Beijing China Chungnam National University Daejon Korea

The Jiachala Formatiom is a new lithostratigraphic unit set up in this paper. This is the first report on the Paleogene marine sequences and microfaunas in Gyangze to the southern side of the Yarlung-Zangbo suture zone. On the basis of fossil abundance, species diversity, dominant species and first and last occurrences of key species, three dinoflagellate assemblages and three polynological assemblages were recognized in the Jiachala Formatiom. They are in ascending order as follows: Apectodinium quinquelatum-Apectodinium hyperacanthum, Cannin- gia chinensis-Palaeoperidinium pyrophorum and Cymatiosphaera reticulosa-Samlandia chla- mydophora dinoflagellate assemblages, and Arliaceoipollenites baculatus-Anacolosidites sub- trudens, Aglaoreidia cyclops-Pinuspollenites microinsigis, and Elaeangnacites asper-Ilexpol- lenites iliacus polynological Assemblages. According to the assemblages, the age of the Jiachala Formation is referred to Paleocene-early Eocene. The preliminary study on the Jiachala Forma- tion shows that this group of Paleogene deposits accumulated in an underfilled peripheral fore- land basin which was in response to the load of the crust thickening resulted from the Asia-India collision. The stratigraphic evidences provided by the evolution of foreland basin indicate that the India-Asia initional collision should occure near the Cretaceous/Paleogene boundary. The de- velopment and evolution of the southern Tibet foreland basin was under the control of the stress field from the subduct-collision between India and Asia and the structure pattern of the basement. The withering of Tethys Sea might occur after early Eocene in the Gyangze basin and should be after Priabonian of late Eocene in southern Tibet.

关键词： Paleogene marine strata, Jiachala Formation, microfossils, underfilled peripheral foreland basin, initional collision, Gyangze.

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