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首页> 外文期刊>GSA Bulletin >SEDIMENTARY VOLUMES IN GULF COASTAL PLAIN OF THE UNITED STATES AND MEXICO: PART III: VOLUME OF MESOZOIC AND CENOZOIC SEDIMENTS IN CENTRAL GULF COASTAL PLAIN OF UNITED STATES
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SEDIMENTARY VOLUMES IN GULF COASTAL PLAIN OF THE UNITED STATES AND MEXICO: PART III: VOLUME OF MESOZOIC AND CENOZOIC SEDIMENTS IN CENTRAL GULF COASTAL PLAIN OF UNITED STATES

机译：美国和墨西哥湾沿岸平原的沉积体积：第三部分：美国中央湾沿岸的中，新生代沉积物体积

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Gulfward-dipping Mesozoic and Cenozoic sediments underlie approximately 145,000 square miles in the Central Gulf Coast between Texas on the west and Georgia on the east. Pre-Cretaceous, Coahuilan, Comanchean, and early Gulfian rocks are predominantly red-bed elastics in the eastern portion of this area; westward and downdip marine facies predominate. Extensive marine deposits comprise the middle and late Gulfian; arenaceous facies predominate in the east; argillaceous and calcareous facies are prevalent westward and downdip. Tertiary deltaic sediments center in Louisiana and Mississippi; eastward and down-dip marine deposits prevail. Fluviatile and deltaic Quaternary deposits occur as a surficial mantle over much of the Central Gulf Coast; offshore these deposits are replaced by marine facies. Stratigraphic studies indicate that major Jurassic and Lower Cretaceous sedimentary units are typically elongate-lenticular while those of the Upper Cretaceous and Cenozoic are ladle-shaped. During Jurassic and Cretaceous times the major source of sediments was apparently eastern United States. In the Cenozoic, appreciable quantities of material appear to have come from western United States. Regional isopachous maps illustrate variations in thickness of Mesozoic and Cenozoic Stratigraphic units. In the emerged (onshore) portion of the plain, deep wells prove the presence of at least 265,000 cubic miles of sediments. Interpolations based on regional studies indicate that the total volume of Mesozoic and Cenozoic deposits in this area will exceed 300,000 cubic miles. The known volumes of sediments that accumulated in the emerged (onshore) portion of the Central Gulf Coast during these times are: Few data are available on volumes of sediments in the submerged (off-shore) portion of the plain, which has an area of approximately 140,000 square miles. Conservatively, it is estimated that at least 200,000 cubic miles of Mesozoic and Cenozoic deposits is present. On the other hand, some evidence indicates the total may exceed 500,000 cubic miles.
机译：在西德克萨斯州和东佐治亚州之间的墨西哥湾中部海岸中，向海湾浸入的中生代和新生代沉积物大约 145，000平方英里。白垩纪前，科阿惠兰，科曼奇安和早期海湾地区的岩石主要是该区域东部的红层弹性体。向西和下倾 海洋相占主导。大量的海洋沉积物包括 海湾中晚期。东部的砂岩相占主导地位；泥质和钙质相普遍向西 和下倾。路易斯安那 和密西西比州的第三纪三角洲沉积物中心； 易碎的和三角洲的第四纪沉积物是中部墨西哥湾沿岸大部分地区的表层地幔。这些沉积物 被海相所取代。 地层学研究表明，侏罗纪和下 白垩纪的主要沉积单元通常是长凸透镜状 < / sup>上白垩纪和新生代的那些是la子形的。 在侏罗纪和白垩纪时期，沉积物的主要来源 显然是美国东部。在新生代，明显的 物质数量似乎来自西方的United 州。 区域等渗图说明了厚度的变化 （陆上）部分，深井证明至少存在265,000立方英里沉积物。根据区域研究得出的插值 表明，该地区的 中生代和新生代矿床的总量将超过300,000 立方英里。 在这段时间 中，在墨西哥湾中部海岸涌现的 （陆上）部分中积累的已知沉积物体积为： 很少有数据是可用在平原的 （近海）部分的沉积物中，该区域的面积约为 140,000平方英里。保守地估计，中生代和新生代沉积物 至少存在200,000立方英里。另一方面，一些证据表明总 可能超过500,000立方英里。

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    《GSA Bulletin》 |1952年第12期|p.1177-1192|共16页
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    GROVER E MURRAY;

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