Oligocene Desmanthus (Leguminosae) from the Qaidam Basin in northeastern Tibetan Plateau, China, and its implications for paleoclimate and paleoelevation
Oligocene Desmanthus (Leguminosae) from the Qaidam Basin in northeastern Tibetan Plateau, China, and its implications for paleoclimate and paleoelevation
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DOI：
10.1080/08912963.2020.1826471
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发表时间：
2020-10
影响因子：
1.4
通讯作者：
Tao Yang;Lei Han;Hongyu Chen;Yong Wang;Haojian Wang;Lin Bao;Wenjia Li;Jia-Hao Cai;Weiyu Liang;Yanzhi Dai;Li Zhang;S. Xie;De-Fei Yan
中科院分区：
文献类型：
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作者：
Tao Yang;Lei Han;Hongyu Chen;Yong Wang;Haojian Wang;Lin Bao;Wenjia Li;Jia-Hao Cai;Weiyu Liang;Yanzhi Dai;Li Zhang;S. Xie;De-Fei Yan
摘要化石是研究青藏高原新生代环境变化和隆升历史的重要资料。柴达木盆地是高原东北部最大的内陆盆地，是研究高原新生代气候变化的关键地区。本文报道了柴达木盆地西北部渐新世上干柴沟组的豆科植物化石，并将其归属于Desmanthus cf. virgatus（L.）Willd.基于形态学比较。目前的材料代表了世界上第一个该属的巨型化石记录。现今化石的类似物生活在年平均温度（MAT）介于13.4 ° C至29.1°C之间，年平均降水量（MAP）介于36 mm至2874 mm之间的地区，而现今柴达木盆地西北部的MAT和MAP分别为−1.03°C和60.5 mm，表明渐新世的柴达木比今天要温暖得多。根据柴达木盆地渐新世的气候条件，计算出现今化石的生长高度不超过2492 m。化石地点的估计海拔与现代海拔之间的差异表明，自渐新世以来，研究区域的海拔至少增加了1000米。
ABSTRACT Fossils are critical for understanding the environmental changes and uplift history of the Tibetan Plateau during the Cenozoic. As the largest inland basin located at the northeastern plateau, Qaidam Basin has been regarded as the key region to understand the climatic changes in the plateau during the Cenozoic. Herein, fossil legumes from the Oligocene Shangganchaigou Formation in northwestern Qaidam Basin have been reported and are assigned to Desmanthus cf. virgatus (L.) Willd. based on morphological comparison. Current materials represent the first megafossil record of this genus in the world. The living analogues of current fossils now live in regions with mean annual temperature values (MAT) ranging from 13.4 to 29.1°C and mean annual precipitation values (MAP) ranging from 36 to 2874 mm while the MAT and MAP of current northwestern Qaidam Basin is −1.03°C and 60.5 mm, respectively, and indicate that the Oligocene Qaidam was much warmer than today. We calculate that current fossils could grow no higher than 2492 m considering the climatic condition of the Oligocene Qaidam. The difference between estimated and modern elevation of the fossil site suggests that the elevation of the research area has increased by at least ≈1000 m since the Oligocene.