Mesozoic-Cenozoic Topographic Evolution of the South Tianshan (NW China): Insights from Detrital Apatite Geo-Thermochronological and Geochemical Analyses

IF 1.8 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Dunfeng Xiang, Zhiyong Zhang, David Chew, Marc Jolivet, Marco G. Malusà, Chao Guo, Nan Wang, Wenjiao Xiao
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Abstract

Abstract The present-day topography of Tianshan is the product of repeated phases of Meso-Cenozoic intracontinental deformation and reactivation, whereas the long-term Mesozoic topographic evolution and the timing of the onset of Cenozoic deformation remain debated. New insights into the Meso-Cenozoic geodynamic evolution and related basin-range interactions in the Tianshan were obtained based on new detrital single-grain apatite U-Pb, fission-track, and trace-element provenance data from Mesozoic sedimentary sequences on the northern margin of the Tarim Basin. Detrital apatite U-Pb age data from Early-Middle Triassic clastic rocks show two prominent age populations at 500–390 Ma and 330–260 Ma, with a paucity of ages between 390 and 330 Ma, suggesting that sediment source is predominantly from the northern Tarim and South Tianshan. From the Late Triassic to Early Jurassic, the first appearance of populations in the 390–330 Ma and 260–220 age ranges indicates that the Central Tianshan-Yili Block and Western Kunlun Orogen were source regions for the northern margin of Tarim Basin. In the Cretaceous strata, south-directed paleocurrents combined with the decrease in the 390–330 Ma age population from the Central Tianshan-Yili Block imply that South Tianshan was uplifted and again became the main source region to the Baicheng-Kuqa depression during the Cretaceous. Our new apatite fission-track data from the southern Chinese Tianshan suggest that rapid cooling commenced at c. 30 Ma along the southern margin, and the Early Mesozoic strata exposed on the southern flank of the Tianshan underwent c. 4–5 km of late Cenozoic exhumation during this period. This age is approximately synchronous with the onset of exhumation/deformation not only in the whole Tianshan but also in the interior of the Tibetan Plateau and its margins. It suggests that far-field, N-directed shortening resulting from the India-Asia collision was transmitted to the Tianshan at that time.
南天山中新生代地形演化:来自碎屑磷灰石地-热年代学和地球化学分析的启示
摘要天山现今的地形是中新生代陆内反复变形和活化的产物,而长期的中生代地形演化和新生代变形发生的时间仍然存在争议。利用塔里木盆地北缘中生代沉积序列的碎屑单粒磷灰石U-Pb、裂变径迹和微量元素物源资料,对天山中新生代地球动力学演化及盆-岭相互作用有了新的认识。早中三叠世碎屑岩的碎屑磷灰石U-Pb年龄显示出500 ~ 390 Ma和330 ~ 260 Ma两个突出的年龄群,而390 ~ 330 Ma之间的年龄较少,表明沉积物来源主要来自塔北和南天山。晚三叠世至早侏罗世,390 ~ 330 Ma和260 ~ 220 Ma的种群首次出现,表明塔里木盆地北缘的源区为中天山—伊犁地块和西昆仑造山带。在白垩系地层中,南向古流与中天山—伊力地块390 ~ 330 Ma种群的减少表明,白垩系南天山隆升,再次成为白城—库车坳陷的主要烃源区。新的天山磷灰石裂变径迹资料表明,南缘的快速冷却开始于c. 30 Ma,暴露在天山南侧的早中生代地层在此期间经历了约4-5 km的晚新生代发掘。这一时代不仅与整个天山,而且与青藏高原内部及其边缘的发掘/变形开始时间大致同步。这表明印度-亚洲碰撞引起的远场n向缩短在当时被传递到天山。
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来源期刊
Lithosphere
Lithosphere GEOCHEMISTRY & GEOPHYSICS-GEOLOGY
CiteScore
3.80
自引率
16.70%
发文量
284
审稿时长
>12 weeks
期刊介绍: The open access journal will have an expanded scope covering research in all areas of earth, planetary, and environmental sciences, providing a unique publishing choice for authors in the geoscience community.
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