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Discovery of Giraffokeryx in China and the Tertiary Chronostratigraphy of linxia, Gansu Province

Chinese Science Bulletin 1995年第9期40卷 758-760页

作者：谷祖纲王四海黄钊文杨立新 Department of Geology Lanzhou University Lanzhou 730000 China

The linxia Basin in Gansu Province, extending across areas of linxia and Lintao, istopographically located in the northeastern edge of the Qinghai-Tibet Plateau. There arewell-developed Tertiary red deposits with a total thickness of about 500 m in this basin, whichwas named the Gansu Group by Hu Min in 1946, representing the Tertiary sediments.

关键词： linxia Basin Shangzhuang Formation of Middle Miocene Giraffokeryx Siwalik.

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Late Cenozoic deformation subsequence in northeastern margin of Tibet --Detrital AFT records from linxia Basin

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Science China Earth Sciences 2003年第Z2期46卷 266-275页

作者： ZHENG Dewen (郑德文) ZHANG Peizhen (张培震) WAN Jinglin (万景林) LI Chuanyou (李传友) CAO Jixiu (曹继秀) Institute of Geology China Seismological Bureau Beijing 100029 China Institute of Geology China Seismological Bureau Beijing 100029 China Institute of Geology China Seismological Bureau Beijing 100029 China Institute of Geology China Seismological Bureau Beijing 100029 China Department of Geology Lanzhou University Lanzhou 730000 China

Two events of Tibet uplifting are revealed by detrital apatite fission track (AFT) age data from linxia Basin. They occurred at about 14 and 5.4-8.0 MaBP respectively. We interpret the first one to be related to the uplifting of the northern Tibet, which might have resulted from convectively removing the thickened lower lithosphere. The second one is a result of Laji Mountain uplifting. Numerous studies of the Tibetan Plateau suggest that the onset time of the deformation in the northeastern margin of Tibetan Plateau and the time of Tibet attaining to its present elevation is about 8 MaBP. They are approximately coincident with the uplift of Lajishan Mountain. It suggests that the northeastern margin of Tibet propagated northeastwardly to its present site in about 8 MaBP for accommodating the sustained convergence between India-Eurasia plate and for keeping its high elevation. The active block pattern dominating the strong earthquake distribution of Chinese continent probably formed at about 8.0-5.4 MaBP.

关键词： linxia Basin, detrital apatite fission track, tectonic event, active block.

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Relations Between Paleoclimatological Conditions and Mineralogical Characteristics of Clays in Miocene Sediments at linxia Basin, China

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矿物学报 2013年第S1期33卷 129-129页

作者： YU Na HONG Hanlie LI Zhaohui ZHANG Kexin LI Rongbiao College of Earth Sciences Jilin University Faculty of Prospecting and Surveying Changchun Institute of Technology Faculty of Earth Sciences China University of Geosciences Geosciences Department University of Wisconsin-Parkside

linxia Basin is a late Cenozoic fault-block basin along the border between the Tibet plateau and the Loess plateau in Northwestern China. Its formation and sediments record may be directly affected by the structural dynamics and the uplift of the Tibet Plateau. For this reason, we studied the mineral characteristics of the Maogou formation of Miocene sediments using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD results showed that quartz, chlorite, illite, calcite, plagioclase, orthoclase, kaolinite, and trace palygorskite are present throughout the sequence of the cross-section in linxia basin. In contrast, gypsum and ankerite occur occasionally in the upper portion of the Miocene deposits. The content of calcite varied with layers in the profile and was relatively concentrated in mudstone. Chlorite and illite were observed transforming into palygorskite under SEM observation. Based on the mineral characteristics and the change of mineral composition, especially the clay minerals, it could be inferred that an arid environment prevailed in the region with warm and cold intervals during Miocene time.

关键词： clay minerals linxia basin paleoclimate palygorksite

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Environmental evolution recorded by lipid biomarkers from the Tawan loess-paleosol sequences on the west Chinese Loess Plateau during the late Pleistocene

Environmental evolution recorded by lipid biomarkers from th...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Fangming Zeng·Shuyuan Xiang·Kexin Zhang·Yulin Lu Institute of Geology and Geophysics,Graduate University, Chinese Academy of Sciences,Box 9825,Beijing 100029,China Faculty of Earth Sciences,State Key Lab of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China Development and Research Center,China Geological Survey, Beijing 100037,China

This study provides a reconstruction of the environmental evolution since 128 ka recorded by the lipid biomarkers of the C-C n-alkanes,the C-C n-alkan- 2-ones and the C-C n-alkanols isolated from the Tawan loess section,Northwest *** in paleoenvironment are reconstmcted from the values of the carbon preference index(CPI),the average chain length(ACL), the L/H(ratio of lower-molecular-weight to higher-molecular -weight homologues),the n-alkane C/C ratios,and the n-alkan-2-one C/C *** parameters indicate the dominance of grasses over the west Chinese Loess Plateau(CLP) during the late Pleistocene. Lower values of the CPI and the ACL values,respectively, indicate stronger microbial reworking of organic matter and changes in plant species,which are both indicative of a warmer-wetter ***,the fluctuations of environment recorded in the Tawan section exhibit ten phases that show obvious cycles between warm periods and cold *** study reveals that changes in the biomarker proxies agree well with changes in the magnetic susceptibility and grain size,and it indicates a huge potential for paleoenvironmental reconstructions by using the n-alkan-2-one and n-alkanol proxies.

关键词： Loess Lipid biomarker linxia Late Pleistocene Earth environment

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