渝东北黑色页岩元素迁移特征及化学风化程度

巫锡勇; 凌斯祥; 任勇; 廖昕; 赵思远; 李晓宁

doi:10.3799/dqkx.2016.017

Volume 41 Issue 2

Feb. 2016

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Wu Xiyong, Ling Sixiang, Ren Yong, Liao Xin, Zhao Siyuan, Li Xiaoning, 2016. Elemental Migration Characteristics and Chemical Weathering Degree of Black Shale in Northeast Chongqing, China. Earth Science, 41(2): 218-233. doi: 10.3799/dqkx.2016.017

Citation:

Wu Xiyong, Ling Sixiang, Ren Yong, Liao Xin, Zhao Siyuan, Li Xiaoning, 2016. Elemental Migration Characteristics and Chemical Weathering Degree of Black Shale in Northeast Chongqing, China. Earth Science, 41(2): 218-233. doi: 10.3799/dqkx.2016.017

Citation:

Wu Xiyong, Ling Sixiang, Ren Yong, Liao Xin, Zhao Siyuan, Li Xiaoning, 2016. Elemental Migration Characteristics and Chemical Weathering Degree of Black Shale in Northeast Chongqing, China. Earth Science, 41(2): 218-233. doi: 10.3799/dqkx.2016.017

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Elemental Migration Characteristics and Chemical Weathering Degree of Black Shale in Northeast Chongqing, China

doi: 10.3799/dqkx.2016.017

Wu Xiyong^{1,2
,},
Ling Sixiang¹,
Ren Yong¹,
Liao Xin^{1*
,
,},
Zhao Siyuan¹,
Li Xiaoning^1,3

1.
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
2.
Key Laboratory of High-Speed Railway Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
3.
School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China

Received Date: 2015-09-13
Publish Date: 2016-02-15

Abstract

Abstract

Black shales are special sedimentary rocks that contain significant amounts of organic matter and sulfide minerals; whereas, less is known about the elemental mobility and weathering mechanism in black shales during chemical weathering. For understanding the chemical weathering processes of black shale in different geographic locations, a number of Shuijingtuo Formation black shale samples were collected from three weathering profiles, namely, profile A (mid-ridge), profile B (near mountaintop), and profile C (valley) at Chengkou County, northeastern Chongqing Province in this study. The major element concentration, mineral composition, and bulk density of each sample were analyzed by XRF, XRD and chemical analysis methods. The results of geochemical analysis indicate that these weathering profiles were significantly depleted of Ca, Mg and Na in all samples but enriched in Al on the surface weathering zone by calculated mass transfer coefficient (τ) and mass transfer flux (M_{j, flux}) in all samples. From the perspective of mineralogy, the calcite, dolomite and plagioclase were dissolved in acid solution produced from pyrite and organic matter, and the illite, gypsum and Fe-oxides were formed during chemical weathering process. From the graphical representations of Na/K-CIA, K/Ca^*-Al/Na, A-CN-K, and A-CNK-FM show that profile A is located in the weak chemical weathering stage of Ca removal. Profile B has reached the weak to moderate chemical weathering stage and being initial stage of Ca and Na removal. Profile C has undergone the early stage of Ca and Na removal, and reached the Si removal (desilication) stage of moderate to strong chemical weathering. Different chemical weathering indexes of CIA, CIW, PIA, and MWPI were calculated in three profiles, showing that the chemical weathering sequence in all profiles is C > B > A.
- black shale,
- chemical weathering,
- element migration,
- mineral transformation,
- chemical weathering index,
- geochemistry,
- petrology

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References(62)

References

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