| 陈泳霖,崔振,白国典,陈剑波.寒武纪芙蓉世碳同位素漂移事件在豫北地区的响应[J].矿产勘查,2026,2(2):246-256 |
| 寒武纪芙蓉世碳同位素漂移事件在豫北地区的响应 |
| The response of the Cambrian Furongian carbon isotope excursion event in northern Henan region |
| 投稿时间：2025-02-18 |
| DOI：10.20008/j.kckc.202602003 |
| 中文关键词: 碳同位素 三山子组 寒武系—奥陶系 豫北 |
| 英文关键词: Carbon isotope Sanshanzi Formation Cambrian-Ordovician Northern Henan |
| 基金项目:本文受河南省自然科学基金项目“寒武纪海相事件沉积层及高精度地层对比标志研究”(202300410024)、河南省地震构造探查工程项目(豫财招标采购-2021-1550；豫财招标采购-2023-320)、河南省地质研究院“黄河流域三门峡盆地段地表基质层分类标准研究”(2024-909-XM02)、项目(2026-XM22)联合资助。 |
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| 中文摘要: |
| 发生在寒武纪晚期芙蓉统中的 Steptoean全球性碳同位素正漂移事件(即 SPICE)是显生宙早期最为显著的碳同位素正漂移事件之一。为了寻找该事件在华北地台上的记录，本文对辉县市李家沟剖面张夏组、山组、炒米店组和三山子组碳酸盐岩地层进行了岩石学、生物地层学、碳酸盐碳(δ13C)氧同位素综合研究。崮结果表明:δ13C在三山子组底部的细晶白云岩中表现为显著的正漂移，最大漂移幅度达到 1.5‰。结合生物地层信息，推测该正漂移对应于 SPICE事件，其起始位置指示了芙蓉统排碧阶的底界。相比世界其他地区，豫北地区的 SPICE事件漂移峰值较小，跨越的地层厚度也较薄，说明华北地台上的 SPICE事件记录具有本地化特征，陆源碎屑物质的输入、局部碳循环的扰动、后期成岩作用的改造、以及海平面的下降等因素的共同作用可能是造成这一本地化特征的原因。 |
| 英文摘要: |
| The Steptoean Positive Carbon Isotope Excursion (SPICE), a globally significant positive carbon iso-tope excursion event recorded in the Late Cambrian Furongian Series strata, represents one of the most prominentEarly Phanerozoic carbon isotope perturbations. To identify records of this event on the North China Platform, an in-tegrated study combining petrographic, biostratigraphic, and carbonate carbon-oxygen isotope (δ13C and δ18O) analy-ses was conducted on carbonate sequences of the Zhangxia, Gushan, Chaomidian, and Sanshanzi formations in theLijiagou section, Huixian City. Results reveal a marked positive δ13C excursion in fine-grained dolostones at thebase of the Sanshanzi Formation, with peak values reaching +1.5‰. Integrated biostratigraphic constraints suggestthis excursion corresponds to the SPICE event, with its initiation marking the base of the Paibian Stage in the Furon-gian Series. Compared with global records, the northern Henan section exhibits a smaller isotopic shift magnitudeand reduced stratigraphic thickness associated with SPICE, indicating distinct regional characteristics in the NorthChina Platform. This localized expression likely results from combined factors including terrigenous clastic input,perturbations of local carbon cycling, post-depositional diagenetic alteration, and regional sea-level regression. Thestudy highlights the importance of considering regional geological contexts when interpreting global geochemicalevents in carbonate platforms. |
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