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Early Miocene Paleoaltitude of the Tuotuohe Basin, Central‐Northern Tibetan Plateau and its Tectonic Implications
Acta Geologica Sinica-English Edition ( IF 3.3 ) Pub Date : 2019-10-04 , DOI: 10.1111/1755-6724.14373
Leyi LI 1, 2, 3 , Hong CHANG 1, 4 , Chong GUAN 2, 5 , Weiguo LIU 1, 4 , Yunning CAO 1, 4
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Reconstruction of the paleoaltitude history of the Tibetan Plateau is critical for understanding the linkage between tectonics and its effect on regional and global climate change. Presently, most of the paleoaltitude studies are concentrated on the southern and southeastern part of the Tibetan Plateau, and few studies have been conducted in the central‐northern part. In this paper we focused on the Wudaoliang Formation in the Tuotuohe Basin, central to northern Tibetan Plateau, to reconstruct paleoaltitude based on carbonate oxygen isotopes. The carbonate samples are primary or have experienced an early stage of digenesis. Based on the thermodynamic and empirical model results, the paleoaltitude of the Wudaoliang Formation is found to be around 2700–3260 m (average of 2980 ± 280 m) in the early Miocene (∼24 Ma). Integrating paleoaltitude results from Wudaoliang Basin and our results, we conclude that crustal shortening and tectonic activity were strong during the late Eocene to late Oligocene‐early Miocene and relatively weak during the early Miocene in the central‐northern Tibetan Plateau.

中文翻译:

青藏高原中北部the陀河盆地中新世早期高原及其构造意义

重建青藏高原的古高原历史对于理解构造学及其对区域和全球气候变化的影响至关重要。目前,大多数古高原研究都集中在青藏高原的南部和东南部,而在中北部进行的研究很少。本文以青藏高原北部中部托托河盆地五道梁组为重点,根据碳酸盐氧同位素重建古海拔。碳酸盐样品是主要的或已经历了成岩作用的早期阶段。根据热力学和经验模型结果,发现中新世早期(〜24 Ma)五道梁组的古海拔约为2700-3260 m(平均2980±280 m)。
更新日期:2019-10-04
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