Palaeovegetation variation in response to the late Oligocene-early Miocene East Asian summer monsoon in the Ying-Qiong Basin, South China Sea
Palaeovegetation variation in response to the late Oligocene-early Miocene East Asian summer monsoon in the Ying-Qiong Basin, South China Sea
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DOI：
10.1016/j.palaeo.2020.110205
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发表时间：
2021-02-02
影响因子：
3
通讯作者：
George, Simon C.
中科院分区：
文献类型：
--
作者：
Ding, Wenjing;Hou, Dujie;George, Simon C.
利用高等植物生物标志物、孢粉记录、页岩中粘土矿物和干酪根显微组分等资料，对南海莺-琼盆地晚渐新世-早中新世古植被和古气候进行了综合重建。在24.9- 18.3Ma期间，较年轻的沉积物中植物源生物标志物的相对丰度有升高的趋势。同样，在这段时间内，有越来越多的热带/亚热带被子植物和蕨类植物在年轻的沉积物，温带松和赤杨属物种的数量较少。在此期间，占主导地位的热带-亚热带高等植物和陆源有机质的大量流入的盛开可能与夏季季风降水在气候变暖。南海东亚夏季风的建立时间为晚渐新世24.9 Ma，可能是北方喜马拉雅-青藏高原隆升的结果。
Late Oligocene-early Miocene palaeovegetation and palaeoclimate in the Ying-Qiong Basin, South China Sea were comprehensively reconstructed using higher plant-derived biomarkers, palynological records, clay minerals, and kerogen maceral compositions of shales. During the period from about 24.9-18.3 Ma, there are trends of higher relative abundances of plant-derived biomarkers in the younger sediments. Similarly, over this time period there are increasing amounts of tropical/subtropical angiosperms and pteridophytes in the younger sediments, and lesser amounts of temperate Pinus and Alnus species. The bloom of the dominant tropical-subtropical higher plants and the large influx of terrigenous organic matter during this period were likely associated with extra summer monsoonal precipitation under a warming climate. The establishment of the East Asian summer monsoon in the South China Sea is proposed at about 24.9 Ma in the late Oligocene, which is likely to have been caused by uplift of the northern Himalaya-Tibetan Plateau at the same time.