阿拉善地块北缘灰石山地区上三叠统珊瑚井组的厘定 来自碎屑锆石U−Pb年龄和植物化石的证据

丁海生; 王振义; 李成元; 雷聪聪; 胡景焕; 王文宝; 李卫星; 马军; 王競繁

doi:10.12097/gbc.2023.03.015

阿拉善地块北缘灰石山地区上三叠统珊瑚井组的厘定来自碎屑锆石U−Pb年龄和植物化石的证据

Determination of the Upper Triassic Shanhujing Formation in the Huishishan area on the northern margin of the Alxa Block: Evidence from detrital zircon U−Pb ages and plant fossils

摘要

摘要:
研究目的 为明确灰石山地区原“下二叠统双堡塘组”部分地层的真实时代与归属，进一步提高该地区地层学认识。
研究方法 以该区域新发现的植物化石Neocalamites sp.为线索，结合碎屑锆石U−Pb测年数据（236.8±2.1 Ma），采用生物地层学与锆石年代学结合的方法，对含化石的地层开展研究。
研究结果 该套地层为晚三叠世河流相沉积，与北山地区上三叠统珊瑚井组相当，应从下二叠统双堡塘组中解体。
结论该套含化石的陆相碎屑岩应划归珊瑚井组，时代为晚三叠世。

Abstract:
Objective To clarify the actual geological age and stratigraphic assignment of part of the strata originally referred to the Lower Permian Shuangbaotang Formation in the Huishishan area and further improve the stratigraphic understanding of this region..
Methods Based on the newly discovered plant fossil Neocalamites sp. in the study area, combined with detrital zircon U–Pb dating results (236.8±2.1 Ma), an integrated method of biostratigraphy and zircon geochronology was applied in this research.
Results These strata are fluvial deposits of the Late Triassic, correlative with the Upper Triassic Shanhujing Formation in the Beishan area, and should be separated from the Lower Permian Shuangbaotang Formation.
Conclusions This fossil−bearing terrestrial clastic succession should be assigned to the Shanhujing Formation of Late Triassic age.

HTML全文

参考文献(45)

施引文献

资源附件(0)