Mid-Miocene sea level altitude of the Qaidam Basin, northern Tibetan Plateau
Mid-Miocene sea level altitude of the Qaidam Basin, northern Tibetan Plateau
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DOI：
10.1038/s43247-022-00671-8
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发表时间：
2023-01
影响因子：
7.9
通讯作者：
Yuanyuan Sun;Yuanyuan Liang;Hu Liu;Jun Liu;Junliang Ji;Xue Ke;Xiaobo Liu;Yuxin He;Huanye Wang
中科院分区：
文献类型：
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作者：
Yuanyuan Sun;Yuanyuan Liang;Hu Liu;Jun Liu;Junliang Ji;Xue Ke;Xiaobo Liu;Yuxin He;Huanye Wang
详细的青藏高原隆升历史对于解开所提出的地球动力学模型和评估其对气候和生物多样性的影响至关重要。然而，高原何时以及如何形成仍然存在很大争议。本文介绍了青藏高原北方柴达木盆地新生代陆相地层中的一些不寻常的海洋地球化学标志，这些标志对盆地的海拔高度有很强的指示意义。我们在整个盆地的调查揭示了典型的海洋烯酮和异常高的碳酸盐碳同位素值在中新世中期，但不是在早期阶段，这是伴随着一个分歧的趋势，成对的碳酸盐氧和叶蜡氢同位素记录。我们推断海水入侵到柴达木盆地，从而限制了中新世中期盆地海拔接近海平面。因此，后来北方高原的大部分显著隆升似乎与青藏高原的向外生长有关。
A detailed uplift history of the Tibetan Plateau is essential for disentangling the proposed geodynamical models and assessing its impacts on climate and biodiversity. However, when and how the plateau formed remains highly controversial. Here, we present unusual geochemical indicators of marine signatures in the Cenozoic terrestrial strata of the Qaidam Basin, northern Tibetan Plateau, with strong implications for the basin altitude. Our investigations across the basin reveal typical marine alkenones and anomalously high carbonate carbon isotopic values during the mid-Miocene, but not at earlier stages, which are accompanied by a divergent trend in the paired carbonate oxygen and leaf wax hydrogen isotopic records. We infer an incursion of seawater into the Qaidam Basin, thus constraining the mid-Miocene basin altitude close to sea level. Hence, much of the substantial northern plateau uplift afterwards appears to be associated with the outward growth of the Tibetan Plateau.