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Episodic Orogeny Deduced from Coeval Sedimentary Sequences in the Foreland Basin and Its Implication for Uplift Process of Longmen Mountain,China

ISSN号：1000-0550
期刊名称：《沉积学报》
时间：0
分类：P544.4[天文地球—构造地质学;天文地球—地质学] P512.2[天文地球—地质学]
作者机构：[1]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, 61o059Chengdu, China, [2]Institute of Geology, Chinese Academy of Geological Science, Beijing 100037, China, [3]Institute of Earthquake Engineering, Seismological Bureau of Siehuan Province, Chengdu 610014, China, [4]Institute of Hazard and Risk Research and Department of Geography, Durham University, Durham, UK
相关基金：supported by the China National Natural Science Foundation （Grant No. 40841010,40972083,41172162）;CGS Foundation （Grant No.1212011121268）;Foundation from State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation （Grant No. SK-0801）

作者： LI Yong[1], SU De-chen[2], ZHOU Rong-jun[3], LI Hai-bing[2], Alexander L.DENSMORE[4], YAN Liang[1], YAN Zhao-kun[1]

关键词：前陆盆地, 沉积序列, 隆升过程, 龙门山, 造山运动, 走滑运动, 情节, 地壳均衡, Wedge-shaped megasequence Tabular megasequence Orogenic loading Erosional unloading Uplift process Longmen Mountain Foreland basin

中文摘要：

Longmen 山在在四川盆和西藏的高原之间的边界定位了，代表高原的任何边的最陡峭的坡度。三个 endmember 模型高举过程和机制被建议了包括外壳的变厚，外壳的流动，和外壳的均衡说的反弹。这里，我们在低岬盆使用同时代的沉积序列到抑制高举在 Longmen 山的过程和机制。超过 10,000 m 厚晚三叠纪第四级的阶层填了这低岬盆并且能被划分成作为二种不同类型被区分的六 megasequences。第一种类型是是装载事件的强壮的活跃的戳的沉积反应的楔形的 megasequences，由沉淀和沉积累积的高率描绘了，变粗向上继任和双来源的沉积供应。这种类型包括晚三叠纪的、迟了的侏罗记到早白垩纪和迟了的白垩纪到 Paleogene megasequences。第二种类型是平坦 megasequences，由沉淀和沉积的低率描绘了累积，鳍向上的继任，和采购单人赛的沉积供应，它是卸掉的均衡说的反弹和侵蚀的沉积反应。这种类型包括对到第四级的 megasequences 的中间的侏罗记，中间的白垩纪和晚第三纪早。基于沉积、活跃构造、似地球形状的证据，我们推断方向在 403.6 妈期间从指导 SSW 的左首的罢工滑倒被颠倒了到指导 NNE 的右罢工滑倒，并且自从 3.6 妈，， Longmen 山插入了带属于与指导 NNE 的右罢工滑倒卸掉的均衡说的反弹和 erosional 的时间。这建议那外壳的均衡说的反弹是一位主要司机为高举并且现在的 Longmen 山的地形学。Wenchuan (Ms8.0 ) 地震，它破裂了有沿着范围前面的指导 NNE 的右罢工滑倒的一个大戳差错，是这个外壳的均衡说的反弹过程与的活跃表明右滑倒罢工、弄短。这个过程可以是为 Wenchuan 地震和高地势的明显的悖论的原因，很少弄短，在这个区域的历史的 seismicity 的相对缺乏。

英文摘要：

Longmen Mountain located at the boundary between the Sichuan Basin and Tibetan Plateau,representing the steepest gradient of any edges of the plateau.Three endmember models of uplift process and mechanism have been proposed,including crustal thickening,crustal flow,and crustal isostatic rebound.Here we use coeval sedimentary sequences in the foreland basin to restraint uplift process and mechanism in the Longmen Mountain.The more than 10,000 m thick Late TriassicQuaternary strata filled in this foreland basin and can be divided into six megasequences that are distinguished as two distinct types.The first type is the wedge-shaped megasequences which are sedimentary response of strong active thrust loading events,characterized by a high rate of subsidence and sediment accumulation,coarsening-upward succession and a dual-sourced sediment supply.This type includes Late Triassic,Late Jurassic to Early Cretaceous and Late Cretaceous to Paleogene megasequences.The second type is the tabular megasequences,characterized by the low rate of subsidence and sediment accumulation,finingupward succession,and a single-sourced sediment supply,which is sedimentary response of isostatic rebound and erosion unloading.This type includes the Early to Middle Jurassic,Middle Cretaceous and Neogene to Quaternary megasequences.Basing on sedimentary,active tectonic,geomorphic evidence,we infer that the direction has been reversed from SSWdirected sinistral strike-slip to NNE-directed dextral strike-slip during 40-3.6 Ma,and since 3.6 Ma,the Longmen Mountain thrust belt belong to times of isostatic rebound and erosional unloading with NNEdirected dextral strike-slip.This suggests that crustal isostatic rebound is a primary driver for uplift and topography of the present Longmen Mountain.The Wenchuan（Ms8.0） earthquake,which ruptured a large thrust fault with NNE-directed dextral strikeslip along the range front,is an active manifestation of this crustal isostatic rebound process with dextral strike-slipping and shortening.This process ma

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