Chronology and geochemistry of the volcanic rocks in Woruo Mountain region,northern Qiangtang depression: Implications to the Late Triassic volcanic-sedimentary events |
| |
Authors: | Wang Jian Fu XiuGen Chen WenXi Wang ZhengJiang Tan FuWen Chen Ming Zhuo JieWen |
| |
Institution: | (1) Chengdu Institute of Geology and Mineral Resources, Chengdu, 610082, China;(2) Graduate Department of Chinese Academy of Geological Sciences, Beijing, 100037, China |
| |
Abstract: | A suite of sedimentary-volcaniclastic rocks intercalated with the volcanic rocks unconformably overlies the Triassic Xiaochaka
Formation in the Woruo Mountain region, Qiangtang Basin, northern Tibet. The vitric tuff from the base of these strata gives
a SHRIMP zircon U-Pb age of 216 ± 4.5 Ma, which represents the age of the Late Triassic volcanic-sedimentary events in the
Woruo Mountain region, and is consistent with that of the formation of the volcanic rocks from the Nadi Kangri Formation in
the Nadigangri-Shishui River zone. There is a striking similarity in geochemical signatures of the volcanic rocks from the
Woruo Mountain region and its adjacent Nadigangri-Shishui River zone, indicating that all the volcanic rocks from the Qiangtang
region might have the same magmatic source and similar tectonic setting during the Late Triassic. The proper recognition of
the Late Triassic large-scale volcanic eruption and volcanic-sedimentary events has important implications for the interpretation
of the Late Triassic biotic extinction, climatic changes and regressive events in the eastern Tethyan domain, as well as the
understanding of the initiation and nature, and sedimentary features of the Qiangtang Basin during the Late Triassic-Jurassic.
Supported by the National Oil and Gas Special Project(Keyou 2006] No.2)”and the National Natural Science Foundation of China
(Grant No. 40472070) |
| |
Keywords: | Nadi Kangri Formation volcanic rocks zircon U-Pb age geochemistry volcanic-sedimentary events Qiangtang Basin in northern Tibet |
本文献已被 SpringerLink 等数据库收录! |
|