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DOI10.1016/j.gexplo.2010.10.010
Trace elements in ferromanganese concretions, gibbsite spots, and the surrounding terra rossa overlying dolomite: Their mobilization, redistribution and fractionation
Feng, Jin-Liang
通讯作者Feng, JL (通讯作者)
发表日期2011
ISSN0375-6742
EISSN1879-1689
起始页码99
结束页码111
卷号108期号:1
英文摘要The mobilization, redistribution and fractionation of trace elements during chemical weathering processes have been investigated on a 4.05 m thick terra rossa profile overlying dolomite on the Yunnan-Guizhou Plateau, in Southwest China. In this in situ weathering profile, the ferromanganese concretions and the gibbsite spots coexist in the terra rossa saprolite. The mass-balance evaluation reveals that titanium, Nb and Hf in the terra rossa matrix are conservative elements during chemical weathering compared to Zr. The elements of Li, Sc, V. Cr, Fe, Ga, As, Mo, Cs, Ce, Ta, TI, Pb and Th in the terra rossa matrix include additions from external sources. Beryllium, Mn, Co, Ni, Cu, Rb, Ba and La are depleted in the shallow parts of the terra rossa profile and enriched in the deep parts. The elements of Zn, Sr, Y, Cd, Sn and U in the terra rossa profile are lost during weathering. Compared to the terra rossa matrix, the ferromanganese concretions are significantly enriched in most trace elements, especially Mn, Co, Cd, Ce, TI and Pb. In contrast, the gibbsite spots are depleted in all trace elements, except for U. The results regarding specific inter-element relationships indicate that most trace elements have different inter-element relationships in the ferromanganese concretions, the gibbsite spots and the terra rossa matrix. This suggests that the behavior of many trace elements during mobilization and redistribution differs from their behavior during incorporation into secondary mineral phases, especially the Mn and Fe oxides and/or oxyhydroxides in the ferromanganese concretions. It is worthy to note that the fractionation between Ce and Mn occurs under intensive chemical weathering conditions. Correspondingly, beryllium exhibits a similar geochemical behavior as that of rare earth elements (except for Ce) and Y during surface weathering. (C) 2010 Elsevier B.V. All rights reserved.
关键词RARE-EARTH-ELEMENTSIRON-MANGANESE CONCRETIONSYUNNAN-GUIZHOU PLATEAUFE-MN NODULESHEAVY-METALSWEATHERING PROFILESSOILSGEOCHEMISTRYMOBILITYOXIDES
英文关键词Terra rossa; Karst weathering; Trace elements; Mass-balance calculation; Redox sensitive elements; Inter-elemental relationship
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000286550600010
来源期刊JOURNAL OF GEOCHEMICAL EXPLORATION
来源机构中国科学院青藏高原研究所
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/257837
推荐引用方式
GB/T 7714
Feng, Jin-Liang. Trace elements in ferromanganese concretions, gibbsite spots, and the surrounding terra rossa overlying dolomite: Their mobilization, redistribution and fractionation[J]. 中国科学院青藏高原研究所,2011,108(1).
APA Feng, Jin-Liang.(2011).Trace elements in ferromanganese concretions, gibbsite spots, and the surrounding terra rossa overlying dolomite: Their mobilization, redistribution and fractionation.JOURNAL OF GEOCHEMICAL EXPLORATION,108(1).
MLA Feng, Jin-Liang."Trace elements in ferromanganese concretions, gibbsite spots, and the surrounding terra rossa overlying dolomite: Their mobilization, redistribution and fractionation".JOURNAL OF GEOCHEMICAL EXPLORATION 108.1(2011).
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