Late Cenozoic tectono-geomorphologic evolution of the northern Tian Shan mountain range: Insight from U-Pb ages of detrital zircon grains from the Upper Oligocene-Quaternary sediments of the southern Junggar basin
Late Cenozoic tectono-geomorphologic evolution of the northern Tian Shan mountain range: Insight from U-Pb ages of detrital zircon grains from the Upper Oligocene-Quaternary sediments of the southern Junggar basin
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北天山晚新生代构造地貌演化：准噶尔盆地南部上渐新世-第四纪沉积物碎屑锆石U-Pb年龄的认识
DOI：
10.1016/j.jseaes.2020.104286
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发表时间：
2020-06-01
影响因子：
3
通讯作者：
Lu, Lixing
中科院分区：
文献类型：
--
作者：
Jia, Yingying;Sun, Jimin;Lu, Lixing
天山造山带是世界上最大的陆内造山带之一，在印亚辐合的远场作用下抬升到现在的高度。本文对准噶尔盆地南部上渐新统—第四纪沉积岩进行了系统的研究，包括砾岩碎屑计数和碎屑锆石U-Pb测年，重建了天山山脉北部晚新生代隆升历史。新的碎屑锆石U-Pb资料为晚新生代Borohoro山脉陆内变形提供了新的约束。晚白垩世—古近纪准噶尔盆地的主要烃源岩为伊利—中天山和北天山。当时的波罗霍洛山脉具有地势低、水系宽的特点。由于北天山的隆升开始于25 ~ 23 Ma，婆罗霍罗山北部的高地形阻碍了伊里-中天山向北的沉积物搬运。北天山成为准噶尔盆地南部的主要物源区。根据沉积物源分析和地貌调查，推测伊犁-中天山在12 ~ 9 Ma开始隆升。结合前人资料，我们认为中中新世隆升事件极有可能发生在整个天山山脉的腹地和前陆地区。
Being one of the largest intra-continental orogens of the world, the Tian Shan orogenic belt was uplifted to its present elevation due to the far-field effect of the India-Asia convergence. In this study, we performed a systematic study on the Upper Oligocene-Quaternary sedimentary rocks from the southern Junggar basin, including conglomerate clast counting and detrital zircon U-Pb dating, to reconstruct the Late Cenozoic uplift history of the northern Tian Shan mountain range. The new detrital zircon U-Pb data provide new constrains on the Late Cenozoic intra-continental deformation of the Borohoro range. The Yili-Central Tian Shan and North Tian Shan were the major sources for the Junggar basin during the Latest Cretaceous-Paleogene period. At that time, the Borohoro range was characterized by low topography and wide drainage pattern. As the uplift of the North Tian Shan commenced at similar to 25-23 Ma, the high topography of the northern Borohoro range blocked the transport of sediments from the Yili-Central Tian Shan to the north. The North Tian Shan became the primary provenance area of the southern Junggar basin. According to sedimentary provenance analysis and geomorphologic survey, we infer that the Yili-Central Tian Shan started to uplift at 12-9 Ma. Combined with previously published data, our results suggest that the Middle Miocene uplift event most likely occurred in both the hinterland and foreland regions along the whole Tian Shan mountain range.