湘东北中生代基性岩脉岩石地球化学及构造意义
Petrological geochemistry of the mesozoic mafic dikes and their implication on tectonic setting in northeast Hunan Province
查看参考文献18篇
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文摘
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湘东北中生代发育以辉绿岩类和煌斑岩类为代表的基性岩脉，属陆内拉斑玄武岩系，部分煌斑岩属于碱性系列。岩石富集LREE，δEu负异常不明显，其形成主要受软流圈地幔部分熔融作用制约。煌斑岩类微量元素总体上具有洋岛玄武岩（OIB）岩浆源区特征，富集Nd、P、Cs而K、Rb、Sr、U、Th等富集程度不明显，Ta、Nb略有富集。辉绿岩类表现出Ta、Nb、Ti亏损，但LILE并不富集，反映地壳混染程度的增强。基性岩脉形成于陆内拉张带的构造环境，岩浆活动未受到中生代大洋板块俯冲的影响。基性岩脉在时、空及物质组成上与湘东南玄武质岩石基本一致，属于整个湘东南岩石圈拉张-减薄带的一部分。 |
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其他语种文摘
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Mesozoic mafic dikes developed in Northeastern Hunan Province were represented by the diabases and lamprophyres. Most of them belong to tholeiite series, a part of lamprophyres belong to alkali basalt series. The petrological and geochemical characteristics show the nature of tholeiite series within continental plate. The chondrite-normalized REE patterns are characterized by LREE enrichment. The negative Eu anomalies are not observed. The correlation analysis of La/Sm-La shows that the mafic dikes were controlled by partial melting. The lamprophyres are rich in LILE, Nd, P, Cs, but K, Rb, Sr, U, Th and Ta, Nb are not enriched very obviously. The HFSE: Tb, Y, Yb and Lu are depleted, which have the general characteristics of OIB. The diabases show Ta, Nb and Ti depletion, but LILE are not enriched, so that Ta and Nb depletion expresses the continental matters hydridization. The mafic dikes occurred in the tectonic setting of a intracontinental extension belt. The magmatic activity had been not influenced by the Mesozoic subducting oceanic plate. The mafic dikes corresponded with the basaltic rocks at Southeastern Hunan Province in space and time as well as lithogeochemistry. It was the northeastern part of the lithospheric extension-thinning belt of the whole Southeastern Hunan Province and they should have a same magma source. |
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来源
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大地构造与成矿学
,2002,26(2):179-184 【核心库】
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关键词
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基性岩脉
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岩石地球化学
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陆内拉张带
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湘东北
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地址
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1.
吉林大学地球探测科学与技术学院, 吉林, 长春, 130026
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中科院贵阳地球化学所, 矿床地球化学开放研究实验室, 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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1001-1552 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程项目
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中国科学院广州地球化学研究所与南海海洋研究所边缘海地质重点实验室基金
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中国科学院贵阳地球化学研究所矿床地球化学中国科学院重点实验室基金
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文献收藏号
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CSCD:964491
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参考文献 共
18
共1页
|
|
1.
Gill J B.
Orogenic andesites and plate tectonics,1981:358
|
CSCD被引
16
次
|
|
|
|
|
2.
Fitton J G. The cameroon line, west Africa, and its bearing on the orogin of oceanic and continental alkali basalt.
Earth Planet Sci Lett,1985,72:23-38
|
CSCD被引
20
次
|
|
|
|
|
3.
Dungan M A. Open system magmatic evolution of the Taos Plateau volcanic field, northern New Mexico: the petrology and geochemistry of the Servilleta basalt.
Geophys Res,1986,91:5999-6028
|
CSCD被引
34
次
|
|
|
|
|
4.
湖南省地质矿产局.
湖南省区域地质志,1988:180-330
|
CSCD被引
7
次
|
|
|
|
|
5.
庄锦良. 湘南地区小岩体与成矿关系及隐伏矿床预测.
湖南地质,1988(增刊第4号):1-198
|
CSCD被引
23
次
|
|
|
|
|
6.
Sun S S. Chemical and isotopic systematics of oceanic basalts: implication for mantle composition and processes.
Magmatism in the Ocean Basins,1989:312
|
CSCD被引
2
次
|
|
|
|
|
7.
Fitton J G. Basic magmatism associated with Late Cenozoic extension in the western United States: compositional variation in space and time.
Geophys Res,1991,96:13693-13711
|
CSCD被引
56
次
|
|
|
|
|
8.
Weaver B L. The origin of ocean island basalt end-member compositions: trace element and isotopic constraints.
Earth and Planetary Science Letters,1991,104:381-397
|
CSCD被引
383
次
|
|
|
|
|
9.
Rogers N W. Potassic magmatism as a key to trace-element enrichment processes in the upper mantle.
Volcano Geother Res,1992,50:85-99
|
CSCD被引
24
次
|
|
|
|
|
10.
涂光炽. 超大型矿床探寻与研究的若干进展.
地学前缘,1994,1:45-53
|
CSCD被引
49
次
|
|
|
|
|
11.
毛景文. 湖南千里山花岗岩体的Sr-Nd同位素及岩石成因研究.
矿床地质,1995,14(3):235-242
|
CSCD被引
74
次
|
|
|
|
|
12.
朱勤文. 湘南中新生代玄武岩岩石学特征.
现代地质,1996,10(4):461-469
|
CSCD被引
18
次
|
|
|
|
|
13.
李献华. 粤北白垩纪基性岩脉的年代学和地球化学.
地球化学,1997,26(2):14-30
|
CSCD被引
234
次
|
|
|
|
|
14.
赵振华. 湖南中生代玄武岩类地球化学特征.
中国科学（D辑）,1998,28(增刊):7-14
|
CSCD被引
160
次
|
|
|
|
|
15.
郭峰. 湘南中生代玄武岩浆成因与岩石圈-软流圈相互作用.
岩石矿物地球化学通报,1998,17(1):1-4
|
CSCD被引
5
次
|
|
|
|
|
16.
Borg L E. The petrogenesis of felsic calc-alkaline magmas from the southernmost Cascades, California: Origin by partial melting of basaltic lower crust.
Petrology,1999,39(6):1197-1222
|
CSCD被引
4
次
|
|
|
|
|
17.
王岳军. 湘东南中生代花岗闪长质小岩体的岩石地球化学特征.
岩石学报,2001,17(1):169-175
|
CSCD被引
80
次
|
|
|
|
|
18.
贾大成. 湘东北构造活化期花岗岩形成构造环境及成因.
大地构造与成矿学,2001,25(4):277-281
|
CSCD被引
6
次
|
|
|
|
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