Mineralogy and geochemistry of three weathered Lower Cambrian black shale profiles in Northeast Chongqing, China

Sixiang Ling; Xiyong Wu; Chunwei Sun; Xin Liao; Yong Ren; Xiaoning Li

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자료유형: 학술저널

저자정보: Sixiang Ling (Southwest Jiaotong University) Xiyong Wu (Southwest Jiaotong University) Chunwei Sun (Southwest Jiaotong University) Xin Liao (Southwest Jiaotong University) Yong Ren (Southwest Jiaotong University) Xiaoning Li (Southwest Jiaotong University)

저널정보: 한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.20 No.6

발행연도: 2016.1

수록면: 793 - 812 (20page)

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This paper reports a geochemical study on the mineralogy and major elements of mid-ridge (A), near mountaintop (B), and valley (C) profiles developed in the Lower Cambrian black shale in Northeast Chongqing, China. The primary objective was to understand the elemental mobility, mineralogical transformation, and weathering progression during black shale chemical weathering in a subtropical climate. Profiles A, B, and C are characterized as weak, weak to moderate, and moderate to intense in terms of weathering intensity, respectively, by the Chemical Index of Alteration (CIA). Results indicate that most elements were mobilized by acidic solutions produced during the oxidation of pyrite and organic matter (OM). Among the major elements, Si was slightly enriched in profile A, but depleted through desilication in profile B and C. Al was enriched in the regolith zone in profile A and C, and Fe was enriched at the oxic front because of secondary clay and sesquioxide formation. The addition and depletion of major elements and the depth of the oxic front increased with the degree of weathering. Gypsum and Fe- (hydro-) oxides were observed to form and re-precipitate in the saprock and fractured shale zones. Clay minerals formed from dissolution of plagioclase and the transformation of other labile clay minerals during weathering. The progressive changes in mineralogical composition of weathered material from profile A to C showed the sequence of mineral decomposition with degree of weathering: first, oxidation of pyrite and OM; then Ca and Mg were removed during dissolution of carbonatite; followed by removal of Na from dissolution of plagioclase; lastly, transformation of clay minerals during weathering; meanwhile, desilication occurs at moderate to intense weathering stages.

참고문헌 (89)

참고문헌 신청

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