Timing of the late Jehol Biota: New geochronometric constraints from the Jixi Basin, NE China

Timing of the late Jehol Biota: New geochronometric constraints from the Jixi Basin, NE China
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热河生物群晚期的时代:来自中国东北鸡西盆地的新地质年代学限制

DOI:
10.1016/j.palaeo.2017.11.063
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发表时间:
2017-12
期刊:
Paleogeopraphy, Paleoclimatology, Paleoecology
影响因子:
--
通讯作者:
Zhao Xueqin
Zhao Xueqin
中科院分区:
其他
文献类型:
--
作者:
Chen Dongxu;Zhang Fengqi;Tian Yuntao;Zhou Zhonghe;Dilek Yildirim;Chen Hanlin;Zhang Kefeng;Zhao Xueqin

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热河生物群是世界著名的东亚早白垩世陆地生态系统,出土了保存异常完好的化石,为了解鸟类和羽毛的起源和进化,以及哺乳动物和被子植物的早期多样化提供了重要的见解。在上个世纪关于生物群从晚侏罗世到早白垩世的时间存在长期争议之后,通过最近的一系列辐射分析,早中热河生物群的寿命被精确地确定为从巴雷姆期到早阿普第期(约131-120 Ma)。然而,对于晚期热河生物群来说,几乎没有严格限制的年龄,这阻碍了我们对陆地生态系统进化历史的全面了解。黑龙江东部城子河组的海相和非海相沉积产生了热河生物群、基底被子植物和白垩纪海相双壳类的非海相双壳类组合,这些组合为了解1990年代以来该生物群盛行的侏罗纪时期提供了至关重要且无可争议的线索。在这里,我们首次发现了城子河组火山灰岩层,通过锆石 U-Pb 地质年代学测得的年代为约 100 年前。 116–111 Ma,为早期被子植物和热河双壳类动物组合提供了首次定量年龄校准。因此,我们证明热河生物群的持续时间延伸到阿普第晚期到阿尔布早期,比目前公认的年龄限制大约年轻 4-9 Myr。
The Jehol Biota is a world-famous Early Cretaceous terrestrial ecosystem in East Asia and has revealed exceptionally well–preserved fossils which provide significant insights into the origin and evolution of birds and feathers, and the early diversifications of mammals and angiosperms. After the long-lived controversies over the timing of the biota varying from Late Jurassic to Early Cretaceous in last century, the lifespan of the early-middle Jehol Biota has been precisely dated from Barremian to early Aptian (ca. 131–120 Ma) by a series of recent radiometric analyses. However, few well–constrained ages are available for the late Jehol Biota, hindering our complete understanding of the evolutionary history of the terrestrial ecosystem. Alternating marine and non-marine deposits of the Chengzihe Formation in eastern Heilongjiang have yielded a non-marine bivalve assemblage of the Jehol Biota, basal angiosperms, and Cretaceous marine index bivalves, which collectively offer crucial and indisputable clues against the prevailing Jurassic time of the biota since 1990s. Here we present the first discovery of tephra layers from the Chengzihe Formation, dated by zircon U-Pb geochronology as ca. 116–111 Ma, providing the first quantitative age calibration for the early angiosperms and the Jehol bivalve assemblage. Therefore, we demonstrate that the duration of the Jehol Biota extends to late Aptian–early Albian, approximately 4–9 Myr younger than the currently accepted age limits.
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