青藏高原及邻区马兰黄土重矿物特征与黄土来源的研究  

Heavy minerals and provenance of the Malan loess on the Qinghai Xizang(Tibet) Plateau and its adjacent area

作　　者：陈国英[1] 孙淑荣 方小敏[1] 康世昌 

机构地区：[1]兰州大学地质系,兰州大学地理科学系

出　　处：《沉积学报》1997年第4期134-142,共9页Acta Sedimentologica Sinica

基　　金：国家教委留学基金;博士点基金

摘　　要：通过对青藏高原及邻区马兰黄土重矿物的研究表明，以昆仑山—布尔汗达山—西倾山—岷山为界，黄土重矿物特征表现为两大沉积区系，以北重矿物母岩特征以侵入岩和深变质岩为主的风化产物，主要来源于亚洲内陆干旱的沙漠、戈壁区；以南重矿物母岩特征，以侵入岩、火山岩和浅变质岩为主的风化物质，主要来源于青藏高原冰碛和寒冻风化物。Study of heavy minerals of the Malan loess on the Qinghai Xizang Plateau and its adjacent area demonstrates that two loess depositional areas in heavy mineral can be clearly divided by the boundary of Kunlun Mts.-Buqing Mts-Xiqing Shan-Min Shan.To the north of this boundary,heavy minerals in the Malan loess are hypometamorphic rocks and come chiefly from the Asian inland desert gobi area;To the south,they are characterized by weathered parent rocks of volcanic,intrusive,and hypermetamorphic rocks and come from tills and periglacial sediments on the Qinghai Xizang Plateau.The regional difference in material in the sourec area,together with the effect of particular landform of the Plateau and the difference of atmospheric circulation,may be mainly responsible for the difference of heavy minerals and provenance of the Chinese Malan loess.

关 键 词：青藏高原 重矿物 马兰黄土 黄土来源 

分 类 号：P642.131[天文地球—工程地质学] P575.2[天文地球—地质矿产勘探]