Heavy minerals and provenance of the Malan loess on the Qinghai -Xizang(Tibet) Plateau and its adjacent area
-
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。高原隆起的特殊地形效应及其所产生的大气环流作用以及源区物质的区域性差别可能是马兰黄土重矿物组成及其来源差异的主要原因.Abstract: Study of heavy minerals of the Malan loess on the Qinghai-Xizang Plateau and its adjacent areademonstrates that two loess depositional areas in heavy mineral can be clearly divided by the boundary ofKunlun Mts.- Buqing Mts- Xiqing Shan- Min Shan.To the north of this boundary, heavy minerals inthe Malan loess are hypometamorphic rocks and come chiefly from the Asian inland desert-gobi area;Tothe south, they are characterized by weathered parent rocks of volcanic, intrusive,and hypermetamorphicrocks and come from tills and periglacial sediments on the Qinghai-Xizang Plateau.The regional differ-ence in material in the sourec area, together with the effect of particular landform of the Plateau and thedifference of atmospheric circulation, may be mainly responsible for the difference of heavy minerals andprovenance of the Chinese Malan loess.
-
Key words:
- Qinghai- Xizang /
- plateau /
- heavy mineral /
- malan loess
-
[1] (1) 郑东生等.黄土与环境.北京: 科学出版社, 1985, 208～219.
(2) 陈国英,陈发虎.兰州九洲台黄土剖面重矿物研究.兰州大学学报, 1993, 29(4): 257～264.
(3) 方小敏.青藏高原东部及邻区马兰黄土成因与来耗的初步研究.中国科学 (B辑), 1994, 24(5): 539～546.
(4) 成都地质学院岩石教研室编.沉积岩石学附编.北京: 中国工业出版社, 1961, 128～129.
(5) 中国地质科学院主编.中华人民共和国地质图集.中国地质图制印厂, 1973.
(6) 叶笃正,高由禧等.青藏高原气象学.北京: 科学出版社, 1979,208～219. -
点击查看大图
计量
- 文章访问数: 730
- HTML全文浏览量: 7
- PDF下载量: 514
- 被引次数: 0
下载:
