Quantifying the rise of the Himalaya orogen and implications for the South Asian monsoon
Quantifying the rise of the Himalaya orogen and implications for the South Asian monsoon
复制标题
量化喜马拉雅造山带的崛起及其对南亚季风的影响
DOI：
10.1130/g38583.1
复制
发表时间：
2017-03-01
期刊：
影响因子：
5.8
通讯作者：
Mehrotra, R.
中科院分区：
文献类型：
--
作者：
Ding, Lin;Spicer, R. A.;Mehrotra, R.
我们使用基于藏南两个新组合（六曲和恰布林）和喜马拉雅前陆盆地四种先前已知植物群的化石叶子中编码的古焓的古高度计，重建了拉萨地体以南的喜马拉雅-西藏造山带南翼的一部分的崛起。锆石U-Pb定年将六曲植物群限制在古新世晚期（约56Ma），而恰布林植物群限制在最早的中新世（21-19Ma）。原始喜马拉雅山相对于高（约4公里）的原始青藏高原缓慢生长，从古新世晚期的约1公里到中新世初期的约2.3公里，到大约19世纪时至少达到约5.5公里。 15马。过去喜马拉雅-西藏大厦和喜马拉雅前陆盆地之间的降水模式对比类似于56 m.y。显示西藏南部逐渐干燥，这似乎与喜马拉雅造山带的隆起有关。
We reconstruct the rise of a segment of the southern flank of the Himalaya-Tibet orogen, to the south of the Lhasa terrane, using a paleoaltimeter based on paleoenthalpy encoded in fossil leaves from two new assemblages in southern Tibet (Liuqu and Qiabulin) and four previously known floras from the Himalaya foreland basin. U-Pb dating of zircons constrains the Liuqu flora to the latest Paleocene (ca. 56 Ma) and the Qiabulin flora to the earliest Miocene (21- 19 Ma). The proto-Himalaya grew slowly against a high (similar to 4 km) proto-Tibetan Plateau from similar to 1 km in the late Paleocene to similar to 2.3 km at the beginning of the Miocene, and achieved at least similar to 5.5 km by ca. 15 Ma. Contrasting precipitation patterns between the Himalaya-Tibet edifice and the Himalaya foreland basin for the past similar to 56 m.y. show progressive drying across southern Tibet, seemingly linked to the uplift of the Himalaya orogen.