Palynological evidence for late Miocene stepwise aridification on the northeastern Tibetan Plateau

被引:61
作者
Liu, Jia [1 ,2 ]
Li, Ji Jun [1 ,2 ]
Song, Chun Hui [3 ,4 ]
Yu, Hao [1 ,2 ]
Peng, Ting Jiang [1 ,2 ]
Hui, Zheng Chuang [1 ,2 ]
Ye, Xi Yan [1 ,2 ]
机构
[1] Lanzhou Univ, MOE Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China
[2] Lanzhou Univ, Coll Earth & Environm Sci, Lanzhou 730000, Peoples R China
[3] Lanzhou Univ, Key Lab Western Chinas Mineral Resources Gansu Pr, Lanzhou 730000, Peoples R China
[4] Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China
基金
中国国家自然科学基金;
关键词
STABLE-ISOTOPE EVIDENCE; ASIAN MONSOON; SUMMER MONSOON; QAIDAM BASIN; LINXIA BASIN; ENVIRONMENTAL-CHANGE; EURASIAN CLIMATE; SURFACE POLLEN; TIANSHUI BASIN; NE MARGIN;
D O I
10.5194/cp-12-1473-2016
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
Holding a climatically and geologically key position both regionally and globally, the northeastern Tibetan Plateau provides a natural laboratory for illustrating the interactions between tectonic activity and the evolution of the Asian interior aridification. Determining when and how the late Miocene climate evolved on the northeastern Tibetan Plateau may help us better understand the relationships among tectonic uplift, global cooling and ecosystem evolution. Previous paleoenvironmental research has focused on the western Longzhong Basin. Late Miocene aridification data derived from pollen now require corroborative evidence from the eastern Longzhong Basin. Here, we present a late Miocene pollen record from the Tianshui Basin in the eastern Longzhong Basin. Our results show that a general trend toward dry climate was superimposed by stepwise aridification: a temperate forest with a rather humid climate existed in the basin between 11.4 and 10.1aEuro-Ma, followed by a temperate open forest environment with a less humid climate between 10.1 and 7.4aEuro-Ma, then giving way to an open temperate forest-steppe environment with a relatively arid climate between 7.4 and 6.4aEuro-Ma. The vegetation succession demonstrates that the aridification of the Asian interior occurred after similar to aEuro parts per thousand aEuro-7-8aEuro-Ma, which is confirmed by other evidence from Asia. Furthermore, the aridification trend on the northeastern Tibetan Plateau parallels the global cooling of the late Miocene; the stepwise vegetation succession is consistent with the major uplift of the northeastern Tibetan Plateau during this time. These integrated environmental proxies indicate that the long-term global cooling and the Tibetan Plateau uplift caused the late Miocene aridification of the Asian interior.
引用
收藏
页码:1473 / 1484
页数:12
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