不同气候带花岗岩风化过程中稀土元素的地球化学行为
Geochemical Behavior of Rare-Earth Element During the Weathering of Granite under Different Climatic Conditions
查看参考文献40篇
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文摘
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本研究选择中国东部主要的花岗岩分布区中位于中温带、暖温带和热带的8个花岗岩风化壳作为研究对象,对比研究了不同气候环境下花岗岩风化过程中稀土元素(REE)的分布规律及其演化特征。结果表明,各气候带的花岗岩风化壳的REE分布具有一定的共性规律,风化产物的REE总量相对基岩都有不同程度的富集,且都表现出轻稀土(LREE)相对重稀土(HREE)富集以及一定程度的Eu负异常。由于REE的迁移和淋滤,导致其在风化壳内的再分配。通常REE在半风化层富集,pH值和粘土矿物含量等内因变化是导致这一现象的主要因素。对于少数表层REE富集的现象,如SD-DG、HN-3剖面,气候环境与地质条件等外因则是这一现象的主导因素。受海洋性气候影响显著的风化壳(QHD-1,HN-3),以基岩为标准,容易发生HREE富集的轻、重稀土分异的现象。大部分花岗岩风化壳中,Ce通常在剖面上部出现正异常,而在下部出现与之互补的Ce负异常。 |
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其他语种文摘
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To illuminate the distribution and evolution characters of Rare Earth Element (REE) during granite weathering process under different climate conditions, this work examined eight profiles located in the main distribution area of granite from mid-temperate zone to tropic zone in Eastern China. Results show that the total concentrations (10~(-6)) of REE (ΣREE) of the weathered products were generally higher than those of the bed rocks in all places, and heavy REE (HREE) enriched relative to the light REE (LREE) while negative Eu anomaly were found more or less in all samples. During granite weathering process, REE have redistributed in the weathering crust due to REE migrating and leaching. Within the weathering profiles, REE leached form the upper layers and usually accumulated at the semi-weathering layers which resulted from variations of internal factors, such as pH and clay mineral content. In a few cases, the enrichment of REE at the upper layers in some weathering profiles such as SD-DG and HN-3, was mainly due to some external factors, such as climate condition and geology background. By the standard of parent rocks, HREE enrichment and differentiation between LREE and HREE were easily found in the granite weathering profiles which are strongly influenced by oceanic climate, such as QHD-1 and HN-2. Within the most granite weathering profiles in the current study, Ce showed the positive anomaly at the upper layers but complementary negative anomaly at the lower layers. |
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来源
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矿物学报
,2016,36(1):125-137 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2016.01.020
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关键词
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花岗岩风化壳
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稀土元素
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分异
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气候
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金重大国际合作项目
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国家自然科学基金重点项目
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国家自然科学基金面上项目
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文献收藏号
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CSCD:5716762
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参考文献 共
40
共2页
|
|
1.
Maher B A. Global connections between aeolian dust, climate and ocean biogeochemistry at the present day and at the last glacial maximum.
Earth-Science Reviews,2010,99(1/2):61-97
|
CSCD被引
41
次
|
|
|
|
|
2.
韩贵琳. 喀斯特河流溶解态稀土元素组成变化及其控制因素.
中国岩溶,2004,23(3):177-186
|
CSCD被引
8
次
|
|
|
|
|
3.
Minasny B. Quantitative models for pedogenesis - A review.
Geoderma,2008,144(1/2):140-157
|
CSCD被引
5
次
|
|
|
|
|
4.
Bao Z. Geochemistry of mineralization with exchangeable REY in the weathering crusts of granitic rocks in South China.
Ore Geology Reviews,2008,33(3/4):519-535
|
CSCD被引
13
次
|
|
|
|
|
5.
Taylor S R. The continental crust: its composition and evolution.
Journal of Geology,1985,94(4):57-72
|
CSCD被引
101
次
|
|
|
|
|
6.
马英军. 化学风化作用中的稀土元素行为及其影响因素.
地球科学进展,2004,19(1):87-94
|
CSCD被引
82
次
|
|
|
|
|
7.
杨元根. 南方红土形成过程及其稀土元素地球化学.
第四纪研究,2000,20(5):469-480
|
CSCD被引
44
次
|
|
|
|
|
8.
李建武. 强烈风化条件下玄武岩发育土壤的元素地球化学特征.
地球与环境,2012,40(4):491-498
|
CSCD被引
7
次
|
|
|
|
|
9.
Nesbitt H W. Mobility and fractionation of rare earth elements during weathering of a granodiorite.
Nature,1979,279(5710):206-210
|
CSCD被引
171
次
|
|
|
|
|
10.
Duddy L R. Redistribution and fractionation of rare-earth and other elements in a weathering profile.
Chemical Geology,1980,30(4):363-381
|
CSCD被引
30
次
|
|
|
|
|
11.
Jahn B. REE geochemistry and isotopic data of Archean silicic volcanics and granitoids from the Pilbara Block, Western Australia: implications for the early crustal evolution.
Geochimica et Cosmochimica Acta,1981,45(9):1633-1652
|
CSCD被引
48
次
|
|
|
|
|
12.
Chauvel C. Nd Sr isotope and REE geochemistry of alkali basalts from the Massif Central, France.
Geochimica et Cosmochimica Acta,1984,48(1):93-110
|
CSCD被引
2
次
|
|
|
|
|
13.
Chakhmouradian A R. Rare earth elements: Minerals, mines, magnets(and more).
Elements,2012,8(5):333-340
|
CSCD被引
34
次
|
|
|
|
|
14.
洪大卫. 中国花岗岩概述.
地质论评,2007,53(B08):9-16
|
CSCD被引
43
次
|
|
|
|
|
15.
池汝安. 风化壳淋积型稀土矿评述.
中国稀土学报,2007,25(6):641-650
|
CSCD被引
122
次
|
|
|
|
|
16.
马英军. 化学风化作用中的微量元素地球化学--以江西龙南黑云母花岗岩风化壳为例.
科学通报,1999,44(22):2433-2437
|
CSCD被引
38
次
|
|
|
|
|
17.
张丽萍. 长江三峡坝区花岗岩风化壳化学元素迁移特征.
地质学报,2001,56(5):515-522
|
CSCD被引
1
次
|
|
|
|
|
18.
吴澄宇. 江西龙南地区花岗岩风化壳中稀土元素的地球化学研究.
地质学报,1989,63(4):349-362
|
CSCD被引
49
次
|
|
|
|
|
19.
熊志方. 北戴河红色风化壳地球化学特征及气候环境意义.
地学前缘,2006,13(6):177-186
|
CSCD被引
17
次
|
|
|
|
|
20.
吴梅贤. 广东英德白沙佛冈花岗岩风化壳地下水中的稀土元素.
地球化学,2003,32(4):335-342
|
CSCD被引
10
次
|
|
|
|
|
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