Oligocene Ailanthus from northwestern Qaidam Basin, northern Tibetan Plateau, China and its implications
Oligocene Ailanthus from northwestern Qaidam Basin, northern Tibetan Plateau, China and its implications
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DOI：
10.1002/gj.3904
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发表时间：
2020-06
影响因子：
1.8
通讯作者：
Tao Yang;Jingwei Jia;Hongyu Chen;Yuxin Zhang;Yong Wang;Haojian Wang;Lin Bao;Li Zhang;Wenjia Li;S. Xie;De-Fei Yan
中科院分区：
文献类型：
--
作者：
Tao Yang;Jingwei Jia;Hongyu Chen;Yuxin Zhang;Yong Wang;Haojian Wang;Lin Bao;Li Zhang;Wenjia Li;S. Xie;De-Fei Yan
柴达木盆地是青藏高原东北部最大的内陆盆地，传统上被认为是研究高原新生代气候变化的重点地区，但由于缺乏植物化石，从古植物学方面的信息还很缺乏。报道了柴达木盆地西北部渐新世上干柴沟组臭椿属植物的化石果实和叶。所有这些特征都表明化石材料应归属于A. confucii是一种广泛分布于新生代的化石种，被认为是现存A.很高。目前的材料是青藏高原北方Simaroubaceae的第一个化石记录。根据气候要求的生活A。altissima，柴达木现今化石反映的年平均温度（MAT）和年平均降水量（MAP）的变化范围分别为6.9-17.0°C和376- 1383 mm，结果表明，化石遗址早渐新世的气候条件比现今的气候条件（MAT =-1.03 °C，MAP = 60.5mm）好得多比现在更温暖更潮湿。因此，早渐新世，暖湿气流可能向柴西北部靠近，以适应柴西北地区的生态环境。
As the largest inland basin in the northeastern Tibetan Plateau, Qaidam Basin has traditionally been thought of as the key region to study the Cenozoic climatic changes in the plateau; however, the information from a palaeobotanic respect is still lacking because of the paucity of the fossil plants. Fossil fruits and foliage of Ailanthus (Simaroubaceae) are reported from the Oligocene Shangganchaigou Formation in the northwestern Qaidam Basin, Qinghai Province, China. All the characters suggest that the fossil materials should be assigned to A. confucii, which is one widely distributed fossil species in the Cenozoic, regarded as the analogue of extant A. altissima. Current materials represent the first fossil record of Simaroubaceae in the northern Tibetan Plateau. Based on the climate requirements of the living A. altissima, the ranges of mean annual temperature (MAT) and mean annual precipitation (MAP) reflected by current fossils from Qaidamare 6.9–17.0°C, and 376–1,383 mm, respectively, compared with the current climate at the fossil site with MAT of −1.03°C and MAP of 60.5 mm. The results indicate that the climate conditions of the fossil site during the Early Oligocene were much warmer and more humid than that of the current. We hereby suggest the warm and moist air could approach the northwestern Qaidam and to accommodate the ecological environment in Early Oligocene.