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DISCOVERY OF THE LATEST MARINE NON-CARBONATE SEDIMENT WESTERN TINGRI, SOUTHERN TIBET

地学前缘 2000年第S1期7卷 54-55页

作者： li xianghui 1, wang chengshan 1,{2., wan xiaoqiao 2. and xu yulin 2.1 Institute of sedimentary geology, chengdu university of technology, chengdu 610059, china 2.geology Department, china university of Geosciences, Beijing 100083, china

The marine non\|carbonate sediment is exposed at the southwestern flank of the Zhepure Syncline where it lies about 4 km east to the typical cross\|section, Gongzha cross\|section (Hao and {2., 1985; Willems et al., 1993, 1996) and ca.75km north to the Qomolangma. There are few people who can approach the place of the cross\|section, even so are endemic Tibetan. The cross\|section is named of the Qumiba cross\|section in this abstract. The new discovery, conformed on the massive Zhepure Formation limestone, here is named of Qumiba Formation. It is composed of two series of terrigenous sediments: Enba Member—lower gray shales intercalating with sandstones, and Zhaguo Member—upper reddish shales interbedding with sandstones. Abundant nannofossils with chronological meanings are first found *** Member Common calcareous nannofossils in the Lutetian such as Chiastozygus barbatus, Chiasmolithus sp., Discoaster barbadiensis, Helicosphaera compacta, Reticulofenstra bisecta, Sphenolithus radians are processed in sample S12.1\|S17W1, in which the Helicosphaera compacta and Sphenolithus radians are part of the indicators of the nannofossil zone NP15. So it is proposed that Units S12.|17, 110 m in thickness, could have been deposited during Middle\|Late Lutetian.

关键词： marine non\|carbonate sediment Tingri Southern Tibet

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MARINE SOURCE ROCKS AND THEIR DEPOSITIONAL CONDITIONS OF MESOZOIC—CENOZOIC IN THE GAMBA—TINGRE BASIN,SOUTH TIBET:ORGANIC GEOCHEMICAL STUDY

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地学前缘 2000年第S1期7卷 423-425页

作者： hu xiumian,{2. chengshan,li xianghui[WT5,5”BX](Institute of sedimentary geology, chengdu university of technology, chengdu 610059, china)

The Gamba—Tingri basin lies in south Tethys Himalaya subzone. It is 400km in length from east to west, and 30～50km in width from north to south. The basin is mainly made up of marine Mesozoic and Lower Cenozoic, i.e., Jurassic, Cretaceous, and Lower Tertiary. Its total strata are more than 3100m in thickness. The passive continental margin of the India plate developed during Jurassic—Cretaceous after a Triassic rifting stage. Collision took place between the India and the Eurasian plate during the latest Cretaceous and earliest Tertiary (liu and Einsele, 1994), which resulted in a Tertiary residual *** Jurassic stratigraphic system in the Gamba—Tingri basin were not carried out until recently (wan et al., 1999), which is divided into three formations, i.e.., Pupuga Fm., Nieniexiongla Fm., and Menkadun Fm.. The Cretaceous and Tertiary stratigraphic system is after wan (1985) and xu et al.(1990), which the Cretaceous is divided into six formations: Dongsan Fm., Chaqiela Fm., Lengqingle Fm., Xiawuchubo Fm., Jiubao Fm., and Zongshan Fm, whereas the Tertiary is divided into Jiabula Fm. Zongpu Fm., and Zhepure Fm.

关键词： marine source rocks depositional conditions Mesozoic Cenozoic organic geochemical study South Tibet

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