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首页> 外文期刊>AAPG Bulletin >Stable-isotope chemostratigraphy as a tool to correlate complex Mississippian marine carbonate facies of the Anadarko shelf Oklahoma and Kansas
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Stable-isotope chemostratigraphy as a tool to correlate complex Mississippian marine carbonate facies of the Anadarko shelf Oklahoma and Kansas

机译：稳定同位素化学地层学作为关联阿纳达科陆架俄克拉荷马州和堪萨斯州的密西西比海海洋碳酸盐相的一种工具

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The Mississippian section of the United States mid-continent Anadarko Basin (Oklahoma and Kansas) has been a prolific hydrocarbon reservoir since the 1920s, yet large-scale regional correlations between individual stratigraphic units remain difficult because of the complex and heterogeneous nature of the carbonate facies. New sedimentologic and carbon isotopic data from a nearly continuous Mississippian core (Pan American 1 Albert Severin) from the Anadarko Basin, Oklahoma (Garfield County), United States, provides insight into the potential of carbon-isotope chemostratigraphy as a correlation tool in complex stratigraphic successions for which biostratigraphic data are not available. The carbon isotopic composition (δ~(13)C) of whole-rock samples was analyzed to determine if stratigraphic trends reflect global changes in the carbon cycle. A large positive shift (+5.6‰ in the lower Tournaisian (Kinderhookian), consistent values (averaging +2.3‰) in the upper Tournaisian through middle Visean (upper Kinderhookian-Meramecian), and a negative shift (-2.3‰ in the uppermost Visean (lower Chesterian) correspond to trends in the carbon isotopic compositions ((δ~(13)C values) from other regional data sets, including the global type section at Arrow Canyon, Nevada. Further analysis of the data reveals that isotopic compositions are not facies dependent, suggesting that marine chemistry and depositional changes in the Anadarko Basin reflect global environmental changes during the Mississippian. These inferences demonstrate the potential of the Pan American 1 Albert Severin core to be a Mississippian-type section for the Anadarko Basin, and that stable-isotope chemostratigraphy can be used as a correlation tool to better understand the subsurface in complex successions, such as the Mississippian limestone of the United States mid-continent.
机译：自1920年代以来，美国中部阿纳达科盆地（俄克拉荷马州和堪萨斯州）的密西西比河段是多产的油气藏，但由于碳酸盐相的复杂性和非均质性，各个地层单元之间的大规模区域相关性仍然很困难。来自美国俄克拉荷马州加德菲尔德县阿纳达科盆地近乎连续的密西西比河岩心（泛美1阿尔伯特·塞韦林）的新沉积学和碳同位素数据，使人们了解了碳同位素化学地层学在复杂地层中作为相关工具的潜力没有生物地层数据的演替。分析了整个岩石样品的碳同位素组成（δ〜（13）C），以确定地层趋势是否反映了碳循环的整体变化。较大的正向偏移（下图尔纳式（Kinderhookian）为+ 5.6‰，恒定值（平均值为+ 2.3‰），在上Visean到中Visean（上层Kinderhookian-Meramecian），而负值式（-2.3‰在最高Visean中） （较低的切斯特勒）对应于其他区域数据集的碳同位素组成趋势（（δ〜（13）C值），包括内华达州艾罗峡谷的全球类型剖面。对数据的进一步分析表明，同位素组成并非如此取决于相的存在，表明阿纳达科盆地的海洋化学和沉积变化反映了密西西比期的全球环境变化，这些推论证明了泛美1 Albert Severin岩心可能成为阿纳达科盆地的密西西比型剖面，并保持稳定同位素化学地层学可以用作相关工具，以更好地了解复杂演替过程中的地下，例如美国中部密西西比州的石灰岩。适当的。

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