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首页> 外文期刊>Clays and clay minerals >THE TIMING OF DIAGENESIS AND THERMAL MATURATION OF THE CRETACEOUS MARIAS RIVER SHALE, DISTURBED BELT, MONTANA
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THE TIMING OF DIAGENESIS AND THERMAL MATURATION OF THE CRETACEOUS MARIAS RIVER SHALE, DISTURBED BELT, MONTANA

机译：蒙大拿州扰动带白垩纪玛丽亚斯河页岩的渗漏时间和热成熟度

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摘要

The hypothesis that chemical remanent magnetization (CRM) in argillaceous rocks may be due to release of Fe during smectite illitization has been tested by study of spatial and temporal relationships of CRM acquisition, smectite illitization, and organic-matter maturation to deformation in the Montana Disturbed Belt. New K-Ar ages and stacking order and percentages of illite layers in illite-smectite (I-S) are consistent with conclusions from previous studies that smectite illitization of bentonites in Subbelts Ⅰ and Ⅱ of the Disturbed Belt was produced by thrust-sheet burial resulting from the Laramide Orogeny. Internally concordant, early Paleogene, K-Ar age values (55-57 Ma) were obtained from clay sub-fractions of thick bentonites which were significantly different in terms of their ages (i.e. Jurassic Ellis Formation and late Cretaceous Marias River Shale), further supporting a model of smectite illitization as a result of the Laramide Orogeny. Internally concordant K-Ar ages were found also for clay sub-fractions from a thick bentonite at Pishkun Canal (54 Ma) and from an undeformed bentonite near Vaughn on the Sweetgrass Arch (48 Ma). In Subbelts Ⅰ and Ⅱ, a greater degree of smectite illitization corresponds to increased thermal maturation, increased natural remanent magnetization intensity, and increased deformation (dip of beds). A dissolution-precipitation model over a short duration is proposed for the formation of illite layers in Subbelts Ⅰ and Ⅱ. A characteristic remanent magnetization was developed before or just after folding began in the early Paleogene. More smectite-rich I-S, low thermal maturity, and the absence of a CRM were noted in one outcrop of an undeformed rock on the Sweetgrass Arch. Strontium isotope data allow for the possibility that internal or externally derived fluids may have influenced illitization, but the K-Ar age values suggest that illitization was probably in response to conductive heating after the overthrusting had occurred. The differences in K-Ar dates among the bentonites studied herein may be due to differences in the timing of peak temperature related to differences in distance below the overthrust slab, in rates of burial and exhumation, and in initial temperature.
机译：通过研究在蒙大拿州扰动的CRM的获取，蒙脱石的软化以及有机物成熟与变形之间的时空关系，检验了泥质岩石中的化学剩余磁化（CRM）可能是由于蒙脱石未熟化过程中的Fe释放的假说。带。新的K-Ar年龄，伊利石-蒙脱石（IS）中伊利石层的堆积顺序和百分率与先前研究得出的结论一致，即干扰带子带Ⅰ和Ⅱ中膨润土的蒙脱石非法化是由冲断片埋藏产生的Laramide造山运动。内部一致的古近纪早期K-Ar年龄值（55-57 Ma）是从厚膨润土的粘土亚组分中获得的，它们的年龄（即侏罗纪埃利斯组和晚白垩世马里亚斯河页岩）存在明显差异。支持由于拉拉米造山作用而蒙皂石化的模型。在皮什昆运河（54 Ma）的厚膨润土和Sweetgrass拱上的沃恩附近的未变形的膨润土（48 Ma）中，也发现了内部一致的K-Ar年龄。在亚带Ⅰ和Ⅱ中，蒙脱石的更大程度的非法化对应于热成熟度的增加，自然剩余磁化强度的增加和变形（床的倾角）的增加。针对Ⅰ，Ⅱ类亚带中的伊利石层的形成，提出了短时间的溶解-沉淀模型。在古近纪早期开始折叠之前或之后，就产生了特征性的剩磁。在Sweetgrass Arch上未变形岩石的一个露头中发现了更多的富含绿土的I-S，较低的热成熟度和没有CRM。锶同位素数据考虑了内部或外部衍生的流体可能影响硅化的可能性，但K-Ar年龄值表明，硅化作用可能是由于发生过推力之后对传导加热的反应。本文研究的膨润土中K-Ar日期的差异可能是由于峰值温度时机的差异所致，该时间与推覆板下方的距离，埋葬和发掘率以及初始温度的差异有关。

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  • 来源
    《Clays and clay minerals》 |2014年第2期|112-125|共14页
  • 作者

    Stephen G. Osborn; Louise Totten Duffield; W. Crawford Elliott; J. M. Wampler; R. Douglas Elmore; Michael H. Engel;

  • 作者单位

    Department of Geological Sciences, California State Polytechnic University, Pomona, CA 91768, USA,Department of Geosciences, Georgia State University, Atlanta, GA 30302-4105, USA;

    Anadarko Petroleum Corporation, 1201 Lake Robbins Drive, The Woodlands, TX 77380, USA,ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, OK 73019, USA;

    Department of Geosciences, Georgia State University, Atlanta, GA 30302-4105, USA;

    Department of Geosciences, Georgia State University, Atlanta, GA 30302-4105, USA,School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332-0340, USA;

    ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, OK 73019, USA;

    ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, OK 73019, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Illite; K-Ar; Montana Disturbed Belt; Remagnetization; Thermal Maturity;

    机译：伊利特人K-Ar;蒙大拿州干扰带磁化;热成熟度;

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