期刊
CHEMICAL GEOLOGY
卷 620, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.chemgeo.2023.121335
关键词
Late Miocene cooling; NE Tibetan Plateau; Paleotemperature reconstruction; Moisture history; EASM evolution
In this study, the late Miocene temperature and hydroclimate changes in the northeastern Tibetan Plateau were reconstructed. The results show a sustained decrease in temperature during this period, primarily due to global cooling. In contrast, humidity exhibits an increasing trend. This opposite evolution is likely caused by the weakening of the East Asian summer monsoon due to global cooling, leading to westward monsoonal moisture transport and increased precipitation.
The late Miocene climatic change is critical to understanding the interactions among late Cenozoic global cooling, tectonic activity and the Asian monsoon system evolution. However, paleoclimate reconstruction is restricted to qualitative descriptions, and quantitative work is rare, which limits further study. Here, we reconstruct the late Miocene temperature and hydroclimate changes based on branched glycerol dialkyl glycerol tetraethers (brGDGTs) and magnetic susceptibility evidence in the Alagu planation surface in the northeastern Tibetan Plateau (NE TP), which is at the junction of the zones of westerly and monsoonal influences. The following preliminary conclusions have been drawn: the late Miocene temperatures exhibit a near-linear decreasing trend, mainly in response to global sustained cooling rather than tectonic activity; while the hu-midity shows an increasing trend opposite to that of temperature. We regard the possible reason for the opposite evolution of the late Miocene temperature and moisture of the Alagu planation surface as the weakening East Asian summer monsoon (EASM) caused by global cooling, leading to westward monsoonal moisture transport and thereby enhancing precipitation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据