Revised chronology of central Tibet uplift (Lunpola Basin).

Revised chronology of central Tibet uplift (Lunpola Basin).
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DOI:
10.1126/sciadv.aba7298
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发表时间:
2020-12
期刊:
影响因子:
13.6
通讯作者:
Chen Y
Chen Y
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Fang X;Dupont-Nivet G;Wang C;Song C;Meng Q;Zhang W;Nie J;Zhang T;Mao Z;Chen Y

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修正的年龄控制和古海拔显示始新世西藏中部低,直到约26 Ma前开始形成广泛的高原。了解青藏高原的地形演变,对于了解青藏高原的建设及其对气候、环境和生物多样性的影响至关重要。从西藏中部伦波拉盆地的稳定同位素记录估计的先前海拔,表明至少35 Ma以来是一个高高原,但最近发现的低海拔热带化石显然沉积在25.5 Ma,对此提出了挑战。在这里,我们使用磁性地层学和放射性年代学来修正伦波拉盆地海拔估计的年代学。更新的年龄与前人的结果相吻合,表明西藏中部的海拔在39.5 Ma时普遍较低(约2.3公里),在~26 Ma时一般较高(3.5~4.5公里)。这支持了始新世低海拔纵向狭窄区的存在,直到中新世早期才被抬升,这对青藏高原的生长机制、亚洲大气环流、地表过程和生物演化具有潜在的意义。
Revised age control and paleoelevations reveal Eocene low central Tibet until ~26 Ma ago when an extensive plateau began to form. Knowledge of the topographic evolution of the Tibetan Plateau is essential for understanding its construction and its influences on climate, environment, and biodiversity. Previous elevations estimated from stable isotope records from the Lunpola Basin in central Tibet, which indicate a high plateau since at least 35 Ma, are challenged by recent discoveries of low-elevation tropical fossils apparently deposited at 25.5 Ma. Here, we use magnetostratigraphic and radiochronologic dating to revise the chronology of elevation estimates from the Lunpola Basin. The updated ages reconcile previous results and indicate that the elevations of central Tibet were generally low (<2.3 km) at 39.5 Ma and high (3.5 to 4.5 km) at ~26 Ma. This supports the existence in the Eocene of low-elevation longitudinally oriented narrow regions until their uplift in the early Miocene, with potential implications for the growth mechanisms of the Tibetan Plateau, Asian atmospheric circulation, surface processes, and biotic evolution.
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