J4 ›› 2010, Vol. 40 ›› Issue (4): 947-954.

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Clay Mineral Analysis of the Early Triassic Tempestites, Lower Yangtze Region

BAO Han-yong1, HAN Guang-min2, YANG Feng-li1, ZHU Jing-chang1, ZHOU Zu-yi1   

  1. 1.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
    2.Geological Survey of Belgium, Brussels 1000, Belgium
  • Received:2009-09-15 Online:2010-07-26 Published:2010-07-26

Abstract:

Based on sampling analysis of clay minerals on Early Triassic storm deposits outcroped in Jingxian, Ningguo and Yixing in the Lower Yangtze region and integrated sedimentological and paleontologyic studies, it is confirmed that when Kübler index (KI) increase the content of smectite decrease and smectite illitization would be restrained. In addition, the clay mineral associations are distinctly different. Therefore, it is concluded that provenance is the main factor that affects smectite illitization and the difference of clay mineral combination. The sources can be divided into two sequences according to the sedimentological characteristics and the content of smectite and illite in clay mineral combination. The results show that the provenance of storm deposits from profiles of Ningguo and Yixing (sequenceⅠ) are of proximal type, while that of Jingxian profile (sequence Ⅱ) demonstrates a combination of proximal and distal type, which means that the location of Jingxian profile is closer to the transitional zone.

Key words: tempestite, Lower Yangtze region, clay mineral, provenance, proximal and distal, sediments

CLC Number: 

  • P588.2
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