中国中部北秦岭造山带白湾盆地热河生物群的校准

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research Pub Date : 2024-08-03 DOI:10.1016/j.cretres.2024.105972

Siyu Song , Xiao Teng , Xin Zhang , Haichun Zhang , Daran Zheng

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引用次数: 0

摘要

热河生物群在东亚分布广泛，为恢复早白垩世陆地生态系统提供了古生物学线索。热河生物群被认为到达了秦岭造山带，但其到达时间尚不清楚。本研究对位于北秦岭造山带的河南省西南部镇平县白湾盆地白湾地层中的热河生物群的年龄进行了初步推定。对含化石层进行了LA-ICP-MS U-Pb分析，得出最大沉积年龄约为123.6 Ma（早古生代）。这一年龄与生物地层分析结果一致，可以大致确定含化石层的位置。该研究证实热河生物群在二次演化阶段已经到达秦岭造山带，揭示了该造山带在热河生物群东亚扩散过程中的独特古地理位置。

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Calibrating the Jehol Biota in the Baiwan Basin of the North Qinling Orogenic Belt, central China

The Jehol Biota sensu lato has a very wide distribution in East Asia, providing palaeontological clues for recovering the Early Cretaceous terrestrial ecosystems. This Biota was considered to reach the Qinling Orogenic Belt but its reaching time remains unclear. In this study, we initially constrained the age of the Jehol Biota recovered from the Baiwan Formation of the Baiwan Basin, Zhenping County, southwestern Henan Province, which geographically lies in the North Qinling Orogenic Belt. LA-ICP-MS U–Pb analyses were conducted for the fossil-bearing layers, providing a maximum depositional age of ca. 123.6 Ma (early Aptian). This age is consistent with the biostratigraphic analyses, and can approximately constrain the fossil-bearing layers. This study confirmed that the Jehol Biota has already reached the Qinling Orogenic Belt during its secondary evolutionary stage, revealing the unique palaeogeographic position of this belt for the dispersal of the Jehol Biota in East Asia.

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来源期刊

Cretaceous Research 地学-地质学

CiteScore

4.10

自引率

19.00%

发文量

235

审稿时长

12 weeks

期刊介绍： Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.