Title: The Response of the Main and Trace Element Concentrations to Climate Evolvement in 8-3.85 Ma Sediment of the Kekeya Section at Yecheng,Xinjiang
Abstract:The Kekeya section at Yecheng,lies in the northwestern margin of the Qinghai-Tibet Plateau.It is composed of three strata from Miocene to Pliocene with the thickness of 2 271.9 m.The lowest stratum is...The Kekeya section at Yecheng,lies in the northwestern margin of the Qinghai-Tibet Plateau.It is composed of three strata from Miocene to Pliocene with the thickness of 2 271.9 m.The lowest stratum is Wuqia Group,with Atushi Formation in the middle and the Xiyu Formation in the upper part.According to the detailed research of measured section and sedimentary facies,major and trace elements were analyzed for the ancient climate information from the deposition of the Kekeya section during 8-3.85 Ma.The element ratios between the deposit and the upper continental crust(UCC) indicate that the paleoclimate of the study area was characterized by cold-dry during 8-3.85 Ma.According to variations of CIA,CaO/Sr,Rb/Sr,CaO/MgO,the palaeoclimatic of the area can be divided into three stages: 0-222 m(1-7 beds in Wuqia Group,about 8.3-8 Ma) was characterized by cold-dry;222-419 m(8-18 beds in Wuqia Group,about 8.3-6.6 Ma) was marked by cold-dry alternating warm-wet;419-1 665 m(16-24 beds in Wuqia Group to Atushi Formation,about 6.6-3.85 Ma) was characterized by more cold-dry than the above two stages.The results of palaeoclimate research lead to the conclusion that the Qinghai-Tibet Plateau might have uplifted to an important critical altitude since 8 Ma.The uplifted plateau may have obstacled the moisture current from the south,so the Tarim Basin turned dry.Before 6.6 Ma,the continuing uplifting of the plateau and the strengthening of winter monsoon from the Siberian induced the climate,causing more drought.Read More
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 4
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