The middle Eocene to early Miocene integrated sedimentary record in the Qaidam Basin and its implications for paleoclimate and early Tibetan Plateau uplift

被引：108

作者：

Song, Bowen ^{[1
]}

Zhang, Kexin ^{[1
]}

Lu, Jingfang ^{[2
]}

Wang, Chaowen ^{[3
]}

Xu, Yadong ^{[1
]}

机构：

[1] China Univ Geosci, State Key Lab Biogeol & Environm Geol, Fac Earth Sci, Wuhan 430074, Hubei, Peoples R China

[2] China Geol Survey, Inst Oceanol, Qingdao 266003, Peoples R China

[3] China Univ Geosci, Fac Earth Sci, Wuhan 430074, Hubei, Peoples R China

来源：

CANADIAN JOURNAL OF EARTH SCIENCES | 2013年 / 50卷 / 02期

关键词：

CARBON-DIOXIDE CONCENTRATIONS; CHEMICAL-WEATHERING RATES; NORTHERN TIBET; TECTONIC EVOLUTION; NORTHEASTERN TIBET; CENOZOIC CLIMATE; CLAY-MINERALS; HEXI CORRIDOR; CONSTRAINTS; TEMPERATURE;

D O I：

10.1139/cjes-2012-0048

中图分类号：

P [天文学、地球科学];

学科分类号：

070403 [天体物理学];

摘要：

Detailed analysis of whole-rock geochemistry, clay minerals, sedimentary color, and pollen in the Dahonggou section, northeast of the Qaidam Basin, are investigated, and the results suggest an intense weathering in the source area during the middle Eocene (similar to 48.5-40.5 Ma), indicating a warm and humid condition. The distinct decrease of chemical weathering degree in source regions began at similar to 40.5 Ma, which is in agreement with the distinct decrease in redness of sedimentary sequences and the disappearance of thermophilic elements in pollen records. This 40.5 Ma cooling event extent demonstrated evidence for an intensification of central Asian aridification, which could be attributed to attainment of high elevations in southern-central Tibet and retreat of the Paratethys from central Asia in the late Eocene, reducing moisture transport to the Qaidam Basin.

引用

页码：183 / 196

页数：14

共 89 条

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