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《Marine Geology & Quaternary Geology》 2002-01
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SEDIMENTARY RESPONSES TO THE GLOBAL EVENT OF TRANSITIONAL PALEOCENE-EOCENE BOUNDARY IN TINGRI, SOUTHERN TIBET

LI Xiang-hui 1,BAO Xiang-nong 2,HU Xiu-mian 1,WANG Cheng-shan 1, WAN Xiao-qiao 3,FAN Shan-fa 4 ( 1 Chengdu University of Technology,610059 Chengdu,China; 2 Gansu Institute of Coal,730000 Lanzhou,China; 3 China University of Geosciences,  
The exact boundary between Paleocene and Eocene,well exposed at Gongzha,northwestern flank of the Zhepure Shan syncline,west to Tingri is determined by benthic foraminiferal assemblages.There is an obvious replacement of Lockhartia community ranging from units 13 to 16 by Alveolina community in units 17~19.Most of the species in the Lockhartia community disappear in the Alveolina community,and ca.70% new species occur in the later community.A sedimentary response can be observed at the boundary of the P/E.The latest Paleocene units 13~16 are dominated by nodular limestone and thin wackstone less than 15 cm in single layer thickness with 5%~10% of clay,and above the boundary,the earliest Eocene units 17~19 are composed of thick blocky wackstone and packstone with clay less than 1%.Some organic geochemical data also provide clues for analysis of the P/E event.Parameters of biomarkers extensively support the idea. For example,Pr/17(pristane n-C17),Ph/18(phytane n-C18),β/17(β-carotane n-C17) and γ/17 (γ-carotane n-C17)increase simultaneously from units 14~16 to units 17~19.The sharp increase of the parameters to great degree is the result of redox condition changes.Organic elements and their relations N,C,N/H and N/O are also distinctly different beneath and above the boundary of the P/E although the causes are not available.From the response of biota,sediment and biomarker in Tingri,southern Tibet,we suppose that it could result from changes of ocean water masses that led to the geologic event at the turnover of the P/E in the Tibetan Tethys Himalayas,and caused the change of aerobic in latest Paleocene to the quasi-,anaerobic environment in the earliest Eocene in southern Tibetan Sea.
【Fund】: 国家有机地球化学重点实验室项目 ( OGL-970 9);; 国家杰出青年科学基金项目 ( 4 96 2 5 2 0 3)
【CateGory Index】: P736.22
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