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《Earth Science Frontiers》 2003-04
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CIA (CHEMICAL INDEX OF ALTERATION)AND ITS APPLICATIONS IN THE NEOPROTEROZOIC CLASTIC ROCKS

FENG Lian-jun, CHU Xue-lei, ZHANG Qi-rui, ZHANG Tong-gang Institute of Geology and Geophysics , Chinese Academy of Science, Chinese Key Lab of Mineral Resources Exploration and Research , Beijing 100029, China  
The chemical index of alteration (CIA) was widely used as an index ascertaining the degree of chemical weathering, this index can be calculated using molecular proportions: CIA = {x(Al2O3)/ [x(Al2O3)+x(CaO* )+x(Na2O)+x(K2O)]} ×100,where CaO* is the amount of CaO incorporated in the silicate fraction of the rock. We used CIA to analyze the Neoproterozoic strata from the Yangjiaping section in the Shimen County of Hunan Province, the values of CIA from glacial sediments (Nantuo Formation and Dongshanfeng Formation) ranging from 60 to 70 and interglacial sediments (Xiangmeng Formation) ranging from 70 to 75 respectively reflect the characteristic of the chemical weathering during the glacial and interglacial period, and the values of CIA from the Xieshuihe Formation ranging from 55 to 70 indicate that the sediments from the Xieshuihe Formation belong to glacial materials. On the other hand, the A - CN - K triangle also can be used to constrain the initial composition of source rocks, since the extrapolation of the sample points back to the P1-Ksp line in the A - CN - K diagram suggests a pla-gioclase to K-feldspar ratio in the provenance. According to the rule, the source rocks from the Xieshuihe Formation is probably the Proterozoic TTG from the South Qinling-Yangtze areas. In addition. K-metasomatism is very pervasive in Precambrian, which represents the right deviation relative to the predicted weathering trend in the A - CN - K diagram. The deviation displayed by the Xieshuihe Formation data indicates that K-metasomatism effect extensively exists. It is an important step to take some proper samples in research. First, we would better take some samples like argillaceous rocks in order to avoid sorting effect changing the composition of the source rocks; second, remove the additional K2O during diagenesis; third, index of compositional variability(ICV) is a useful index to estimate whether the recycling of previously weathered detritus would change the composition of the source rocks or not. When ICV is more than 1, it indicates that the sedimentary rocks belong to first-cycle deposits. Therefore, we choose samples whose values of ICV are more than 1.
【Key Words】: CIA (chemical index of alteration) K-metasomatism chemical composition of source rocks the degree of the chemical weathering Neoproterozoic the Yangjiaping section
【Fund】: 国家自然科学基金(49973008 40172015);; 中国科学院创新项目(KZCX2-116)
【CateGory Index】: P588.21
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