塔里木盆地顺北地区中—晚奥陶世稳定碳同位素特征及意义CHARACTERISTICS AND CORRELATION OF THE STABLE CARBON ISOTOPE RECORDS IN THE MIDDLE TO LATE ORDOVICIAN CARBONATES IN THE SHUNBEI AREA, TARIM BASIN, NW CHINA
成俊峰,董少峰,陈中阳
摘要(Abstract)：
本研究对塔里木盆地顺北地区3口典型钻井岩屑样品的稳定碳同位素组成进行分析,揭示盆地腹地中—晚奥陶世碳同位素变化特征,并与世界其他地区进行对比,探讨碳同位素作为井下奥陶系精细划分和对比标志的可行性。除少量样品因受后期成岩作用改造具有明显偏负的δ~(13)C值外,绝大多数样品保持较好的碳氧同位素值纪录。整体而言,在达瑞威尔期之前,δ~(13)C值分布较为稳定,略有偏负,大致在-1.0‰附近变化;此后,δ~(13)C值逐渐增大至+2‰并呈现出振荡性变化的特征。本研究识别出两次正漂移事件,分别对应国际上的达瑞威尔期中期碳同位素正漂移(MDICE)和凯迪早期的碳同位素正漂移(GICE)。其中,顺北地区井下的MDICE正漂移幅度较世界其他地区报道的略微偏低,GICE正漂移事件与其他地区发现的特征基本一致,可作为塔里木盆地井下中—晚奥陶世地层精细划分和对比的识别标志。
关键词(KeyWords)： 碳同位素;中—晚奥陶世;顺北地区;塔里木盆地
基金项目(Foundation): 中国石油化工股份有限公司西北油田分公司科研项目(KJ202004)资助
作者(Author): 成俊峰,董少峰,陈中阳
DOI: 10.19839/j.cnki.dcxzz.2020.0035
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