Behavior of rare earth elements in granitic profiles, eastern Tibetan Plateau, China

Rare earth elements（REEs） can record geologic and geochemical processes. We studied two granitic regolith profiles from different climatic zones in eastern Tibetan Plateau and found that（1）∑ RREEs ranged from119.65 to 275.33 mg/kg in profile ND and5.11–474.55 mg/kg in profile GTC, with average value...

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Bibliographic Details
Published in:Acta geochimica 2017-09, Vol.36 (3), p.552-555
Main Authors: Cui, Lifeng, Zhao, Zhiqi, Liu, Congqiang, Xu, Sheng, Liu, Taoze, Tu, Chenglong, Ding, Hu
Format: Article
Language:English
Subjects:
Bedrock
Climate
Climatic zones
Earth
Earth and Environmental Science
Earth Sciences
Fractionation
Geochemistry
Minerals
Neodymium
Original Article
Oxidoreductions
Pedosphere
Plateaus
Profiles
Rare earth elements
Regolith
Rocks
Stone
Trace elements
Tropical climate
Weathering
中国
地球化学过程
氧化还原条件
花岗岩风化壳
行为
西藏高原
轻稀土元素
重稀土元素
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Summary:Rare earth elements（REEs） can record geologic and geochemical processes. We studied two granitic regolith profiles from different climatic zones in eastern Tibetan Plateau and found that（1）∑ RREEs ranged from119.65 to 275.33 mg/kg in profile ND and5.11–474.55 mg/kg in profile GTC, with average values of205.79 and 161 mg/kg, respectively. ∑RREEs was higher in accumulation horizon and semi-regolith;（2） Influenced by climate, the fractionation of light and heavy REEs（LREEs and HREEs） varied during weathering. The ratio of LREEs/HREEs in pedosphere was higher than semi-regolith in tropical profile;（3） A negative Eu anomaly in both profiles was the result of bedrock weathering. A positive Ce anomaly was observed in all layers of profile ND, and only in the upper 100 cm of profile GTC. This indicates that redox conditions along the regolith profile varied considerably with climate.（4） Normalized by chondrite,LREEs accumulated much more than HREEs; REE distribution curves were right-leaning with a V-type Eu anomaly in both profiles.
ISSN:2096-0956
2365-7499
DOI:10.1007/s11631-017-0234-7