The Pengqu Formation: a New Eocene Stratigraphical Unit in Tingri Area, Tibet
The Pengqu Formation: a New Eocene Stratigraphical Unit in Tingri Area, Tibet
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发表时间：
2000
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通讯作者：
Li Xiang
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作者：
Li Xiang
在藏南定日西部哲普拉山向斜西北翼的曲米坝发现了一套由灰色、紫色页岩、细岩屑砂岩和粉砂岩组成的非碳酸盐岩沉积序列，厚约180m。我们称之为蓬曲组。可分为两段，上段（扎果段）为紫红色，下段（恩坝段）为灰色和绿灰色。非化石和有孔虫化石表明其时代可能为Lutetian中晚期至Bartonian早期。非碳酸盐沉积为解释新特提斯洋的末次闭合时间、印度次大陆与亚洲大陆的碰撞过程以及喜马拉雅山和冈底斯的初次隆升提供了依据。
A sequence of non carbonate sediments totalling 180m thick was recently found at Qumiba on the northwestern flank of the Zhepure Shan Syncline, in western Tingri, southern Tibet, which are composed of gray and purple shale, fine lithoclastic sandstone, and siltstone. Here we name it Pengqu Formation. It can be divided into in two members, the upper member (Zhaguo Member) in purple and reddish and the lower member (Enba Member) is gray and greenish gray. Nonnofossils and foraminiferal fossils indicate that it may range in age from mid-late Lutetian to early Bartonian. The non carbonate sediments provide the basis the interpretation of the last closure time of the Neo Tethys Ocean, and the process of the collision between the India Subcontinent and Asia Continent, and the primary uplift of the Himalayas and Gangdise.