Age constraints on a Neogene tropical rainforest in China and its relation to the Middle Miocene Climatic Optimum

Age constraints on a Neogene tropical rainforest in China and its relation to the Middle Miocene Climatic Optimum
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中国新近纪热带雨林的年龄限制及其与中中新世最适气候的关系

DOI:
10.1016/j.palaeo.2019.01.019
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发表时间:
2019-03
期刊:
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子:
--
通讯作者:
Chang Su-Chin
Chang Su-Chin
中科院分区:
其他
文献类型:
--
作者:
Zheng Daran;Shi Gongle;Hemming Sidney R.;Zhang Haichun;Wang Weiming;Wang Bo;Chang Su-Chin

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热带雨林在其整个进化历史中对地球系统产生了强烈的影响。福建佛潭群植物群的发现表明中新世中国东南部曾存在亚洲热带雨林。大量的含虫琥珀与露头中的植物化石共生。火炭群化石表明中国东南部新近纪早期存在高度多样的热带生态系统。本文报道了佛堂化石的40 Ar/39 Ar年龄为14.7 ± 0.4Ma。这一年龄限制了对以下问题的解释:1)中国热带雨林生态系统何时发展; 2)火炭植物群是否与印度的亚洲热带森林在时间上重叠; 3)中新世中期气候适宜期是否引发了亚洲热带雨林的扩张。一个精确的年龄火炭单位提供了重要的限制,该领域的古地理历史和古地理模型连接亚洲和印度的生物群。
Tropical rainforests have strongly influenced Earth systems throughout their evolutionary history. Plant taxa found in the Fotan Group of Fujian Province indicate that an Asian tropical rainforest prevailed in southeastern China during the Miocene. Abundant insect-bearing ambers co-occur with diagnostic plant fossils in outcrop. Fotan Group fossils demonstrate that highly diverse tropical ecosystems existed during the early Neogene in southeastern China. This study reports a robust40Ar/39Ar age of 14.7 ± 0.4 Ma for the Fotan fossils. This age constrains interpretations of 1) when tropical rainforest ecosystems developed in China, 2) whether the Fotan flora temporally overlapped with the Asian tropical forest in India, and 3) whether the Middle Miocene Climatic Optimum triggered expansion of tropical rainforests in Asia. A precise age for Fotan units provides important constraints on the biogeographic history of the field area and paleographic models linking Asian and Indian biota.
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