湖北宜昌樟村坪埃迪卡拉系陡山沱组C同位素变化及成因

发布时间：2018-04-17 11:12

本文选题：埃迪卡拉系 + C稳定同位素　；参考：《地质通报》2017年05期

【摘要】：以宜昌樟村坪地区万家沟和白鹭垭2个陡山沱组剖面为研究对象,开展了黄陵背斜北缘浅水沉积区埃迪卡拉系陡山沱组C稳定同位素研究。建立了黄陵背斜北缘陡山沱组C稳定同位素曲线,并识别出4次负漂移(ZN1~ZN4),3次正漂移事件(ZP1~ZP3)。其中3次负漂移可以全球对比,1次负漂移(ZN3)在峡东地区可以显著识别。确认了ZN4与DOUNCE事件的对应关系,且该区缺失峡东典型剖面陡山沱组四段。认为ZN1是全球性甲烷渗漏事件的反映;ZN2是区域性海平面下降的反映,与全球WANCE事件有很好的对应关系,而对应年代值要远比Gaskeris冰期时间早;ZN3应当是区域性洋流上升带来贫13C沉积物引起的;ZN4则可以非常好地用埃迪卡拉纪海洋有机碳库氧化来解释。
[Abstract]:The C stable isotopes of the Doushantuo formation of the Doushantuo formation of the Edikala system in the northern margin of the Huangling anticline were studied by taking the sections of Wanjiagou and Bailuya Doushantuo formation in Zhangcuuping area of Yichang as the research objects.The C stable isotopic curves of Doushantuo formation in the northern margin of Huangling anticline have been established and 4 negative drift events have been identified.Three of the negative drifts can be distinguished in the east of the gorge by global comparison with one negative drift (ZN3).The relationship between ZN4 and DOUNCE events is confirmed, and the fourth member of Doushantuo formation is missing in this area.It is considered that ZN1 is the reflection of global methane leakage events, and ZN2 is a reflection of regional sea level drop, which has a good corresponding relationship with global WANCE events.The corresponding age value is much earlier than that of Gaskeris glacial epoch, and ZN3 is probably caused by the poor 13C sediment caused by the regional ocean current rise, which can be explained very well by the oxidation of marine organic carbon pool in the Ediacaran period.
【作者单位】：中国地质调查局武汉地质调查中心;
【基金】：中国地质调查局项目《华南中部震旦纪—志留纪地层格架、岩相古地理与成矿关系》(编号:1212011121103)和《中扬子地区古生界页岩气基础地质调查》(编号:DD20160179)
【分类号】：P534.31;P597

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