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首页> 外文学位 >Sedimentology and stratigraphy of Upper Triassic carbonate and clastic strata of the Chulitna terrane, Alaska Range, south-central Alaska.
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Sedimentology and stratigraphy of Upper Triassic carbonate and clastic strata of the Chulitna terrane, Alaska Range, south-central Alaska.

机译：阿拉斯加中南部阿拉斯加丘里特纳地层上三叠统碳酸盐岩和碎屑岩层的沉积学和地层学。

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摘要

The Chulitna terrane of the southern Alaska Range is one of the more enigmatic tectonic terranes in the North American Cordillera and is defined in part by the occurrence of Upper Triassic red bed and carbonate units that occur in association with basalt and serpentinite in the Alaska Range suture zone. New geologic mapping and measured stratigraphic sections of Upper Triassic strata from the Chulitna terrane reveal a continuous record of siliciclastic, volcaniclastic, and carbonate sedimentation. Red bed units consist largely of interbedded successions of poorly-sorted and matrix-supported sandstone, siltstone, and conglomerate. Individual beds are typically 0.25--2 m thick and exhibit tabular geometries. Upper Triassic units in the Chulitna terrane were originally thought to represent three distinct successions that were stratigraphically unrelated. However, measured sections revel that carbonate and red bed units are interbedded throughout the Chulitna terrane. Clastic and carbonate strata are interpreted to represent deposition in a marginal marine fan-delta complex characterized largely by debris flow processes, fluvial-deltaic and beach-barrier island sedimentation, as well as lagoon and carbonate reef/bank sedimentation. Upper Triassic carbonate and clastic strata of the Chulitna terrane are interpreted to represent sedimentation associated with an isolated period of exhumation and clastic sedimentation, bimodal volcanism, and carbonate precipitation during at the end of the Triassic.
机译：阿拉斯加山脉南部的丘利特纳地层是北美山脉中较神秘的构造地层之一，其部分定义是由于上三叠纪红层和碳酸盐岩单元的出现与阿拉斯加山脉缝合线中的玄武岩和蛇纹岩有关区。来自丘利特纳地层的上三叠纪地层的新地质测绘和测得的地层剖面揭示了硅质碎屑，火山碎屑和碳酸盐岩沉积的连续记录。红层单元主要由层序错乱，基质支撑的砂岩，粉砂岩和砾岩层间交错层序组成。单个床的厚度通常为0.25--2 m，并具有表格几何形状。 Chulitna地层中的上三叠纪单元最初被认为代表了三个在地层上不相关的不同演替。但是，实测断面表明，整个Chulitna地层中都夹有碳酸盐岩层和红层岩层。碎屑岩和碳酸盐岩地层被解释为代表在边缘海扇三角洲复合体中的沉积，其主要特征是泥石流过程，河流三角洲和海滩屏障岛沉积，泻湖和碳酸盐礁/河岸沉积。 Chulitna地层的上三叠纪碳酸盐岩和碎屑岩层被解释为代表与三叠纪末期发掘和碎屑沉积，双峰火山作用和碳酸盐沉淀的孤立时期有关的沉积。

著录项

  • 作者

    DeLoge, Jennifer L.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Geology.
  • 学位 M.S.
  • 年度 2009
  • 页码 145 p.
  • 总页数 145
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

  • 入库时间 2022-08-17 11:38:27

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