Cenozoic evolution of the Pamir and Tien Shan mountains reflected in syntectonic deposits of the Tajik Basin
Cenozoic evolution of the Pamir and Tien Shan mountains reflected in syntectonic deposits of the Tajik Basin
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DOI：
10.1144/sp427.7
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
M. Klocke;T. Voigt;J. Kley;S. Pfeifer;T. Rocktäschel;S. Keil;R. Gaupp
中科院分区：
文献类型：
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作者：
M. Klocke;T. Voigt;J. Kley;S. Pfeifer;T. Rocktäschel;S. Keil;R. Gaupp
摘要位于中亚的塔吉克盆地东北部，北夹天山山脉，南夹帕米尔高原，是研究这些山系演化的重要地区。沉积记录反映了晚渐新世以来塔吉克盆地东北部及毗邻造山带的侵蚀和沉积历史。塔吉克盆地东北部的沉积岩由近源辫状河沉积的厚层单元组成。它们反映了从北方帕米尔和南天山边缘延伸出来的大型河流平原，但与已建立的岩石地层方案无关。塔吉克盆地东北部渐新世-上新世同造山期沉积物，除天山活动边缘的上中新世-新近纪近源沉积物外，几乎全部来自帕米尔山脉北方。渐新世以来，天山西南部部分地区的初始隆升伴随着低能沉积阶段和南部源区的优势。自中新世中期以来，随着粗河流沉积物沿着塔吉克盆地北方边缘的近端沉积，山脉受到侵蚀。
Abstract The NE Tajik Basin in Central Asia, compressed between the ranges of the Tien Shan in the north and the Pamir in the south, is a key region for understanding the evolution of these mountain systems. Erosion and deposition history of the NE Tajik Basin and the adjoining orogens since the late Oligocene is reflected in the sedimentary record. The sedimentary rocks of the NE Tajik Basin are composed of thick units of proximal braided river deposits. They reflect large fluvial plains extending from the margins of the Northern Pamir and the Southern Tien Shan mountains, but are not related to the established lithostratigraphic scheme. Almost all Oligocene–Pliocene synorogenic deposits of the NE Tajik Basin were derived from the northern Pamir ranges, except upper Miocene–Recent proximal deposits close to the active margin of the Tien Shan. Initial uplift in some areas of the SW Tien Shan since the Oligocene was followed by a phase of low-energy sedimentation and a predominance of the southern source area. Since the middle Miocene, erosion of the ranges has occurred with the proximal sedimentation of coarse fluvial deposits along the northern margin of the Tajik Basin.