RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (06): 943-951.doi: 10.11870/cjlyzyyhj201606010

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HEAVY MINERAL COMPOSITION CHARACTERISTICS AND SIGNIFICANCE OF LOESS IN THE UPPER HAN JIANG RIVER VALLEY

CUI Tian-yu, PANG Jiang-li, HUANG Chun-chang, ZHA Xiao-chun, ZHOU Ya-li, ZHANG Wen-tong   

  1. College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China
  • Received:2015-09-29 Revised:2015-12-18 Online:2016-06-20
  • Supported by:
    National Natural Science Foundation of China (Grant No.41271108, 41371029);National Social Science Foundation of China(Grant No.14BZS070);National Higher-education Institution General Research and Development Funding (No.GK201301003)

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Abstract: By the analysis on the heavy mineral in eolian loess in the upper Han Jiang river valley, we get many characteristics of the heavy mineral. There are more than 20 kinds, including opaque minerals such as hornblende, magnetite, ilmenite etc. They are the advantageous minerals, accounting for 60% of all. The stable minerals are 47.95% of the total heavy mineral, which are the main mineral in loess on Hanjiang River. The kinds of heavy minerals in Hanjiang are similar to that in the Loess Plateau. They are resembled to the stability, indicating the same resource between them. However, the content of stable minerals is relatively high and that of instable minerals is relatively low. The reason is that the distance between the Hanjiang River and the main sourced regions are higher than that between Loess Plateau and the sourced regions. It resulted in the difficult reservation of the instable minerals because of the wet climate. The mineral compositions in different stratigraphy of the loess profile in the upper Hanjiang River are same, indicating the same resource in loess and palaeosol in the late Pleistocene, and the composed materials in the S0 succeed to that of L1 and different content between each other. There are higher content of instable minerals in L1 than that of S0 but relatively low in the stable minerals. The surface of the minerals is fresh and clean, and the clay is relatively less than that in palaeosol. The instable minerals were made into clay minerals because of the strongly weathering and pedogenesis during the formation of palaeosol.

Key words: heavy mineral, composition characteristics, weathering process, sediments provenance, upper Hanjiang River Valley

CLC Number: 

  • P531
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