The Paleocene syncollisional deposits in Renbu, southern Tibet, China: New insights into the foredeep–wedge evolution of the Himalayan foreland

IF 2
Zhen Wei , Xiang-Hui Li , Min-Jia Sun , Xiao-Long Fan , Jing-Yu Wang
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Abstract

Understanding turbidites and olistostromes in the foredeep depozone is critical for deciphering foreland–orogenic wedge interactions. Despite the abundance of syncollisional deposits in the central Himalaya, current research lacks analysis of their depositional models in this context. Our study focuses on the Renbu Unit, a recently discovered Paleocene syncollisional deposits in Renbu, assessing its lithological composition, sedimentary environment, and provenance. The lower part of the Renbu Unit is characterized by fine-grained turbiditic sandstones, showcasing maximum depositional ages of ∼80 Ma. Contrarily, the upper part, composed of coarse-grained turbiditic sandstones, presents a maximum depositional age of ∼64 Ma. The sandstones sources vary from the recycled Xigaze forearc basin in the lower unit to the Gangdese arc in the upper unit. Hence, the lower Renbu Unit could equate to the Jiachala Formation, and the upper Renbu Unit could correspond to its eroded counterpart whose zircon geochronology fits the biostratigraphic data of the Jiachala Formation. This leads to a new depositional model suggesting near-contemporaneous deposition of the Zongzhuo mélange, Jiachala Formation, and the Renbu Unit in the foredeep, demonstrating events like the orogenic front's collapse and gravity flow deposition.
藏南仁部古新世同碰撞沉积:喜马拉雅前陆前深楔演化新认识
了解前深沉积带中的浊积岩和鲕粒岩对于解释前陆-造山带的相互作用至关重要。尽管喜马拉雅中部有丰富的同碰撞矿床,但目前的研究缺乏在这种背景下对其沉积模式的分析。本文以新发现的仁部古新世同碰撞矿床仁部单元为研究对象,对其岩性组成、沉积环境和物源进行了评价。人步单元下部以细粒浊积砂岩为特征,最大沉积时代为~ 80 Ma。上部由粗粒浊积砂岩组成,最大沉积年龄为~ 64 Ma。砂岩源区从下单元日喀则弧前盆地的再循环到上单元冈底斯弧。据此,下人布单元可与嘉查拉组对应,上人布单元可与侵蚀后的嘉查拉组对应,其锆石年代学与嘉查拉组生物地层资料吻合。在此基础上,建立了宗卓组、贾恰拉组和仁布组近同时期沉积的新沉积模式,反映了造山带前缘崩塌和重力流沉积等事件。
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