西秦岭温泉混浆花岗岩的微量与稀土元素地球化学特征

李永军; 李景宏; 孔德义; 李英; 刘志武; 李注苍; 李金宝

西秦岭温泉混浆花岗岩的微量与稀土元素地球化学特征

1.
长安大学地球科学与国土资源学院, 陕西西安 710054
2.
新疆地质矿产勘查开发局地质九队, 新疆乌鲁木齐 830000

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出版历程
- 收稿日期: 2003-01-13
- 修回日期: 2003-06-26
- 发布日期: 2003-09-04

The geochemical features and its genesis of the trace and REE of the Wenquan magma mixing granite in wester Qinling

1.
School of Earth Science and Land Resources, Chang'an University, Xi'an 710054, China
2.
No.9 Geological party, BGMRED of Xinjiang, Urumqi 830000, China

摘要

摘要: 西秦岭温泉岩体是壳、幔岩浆混浆的产物。寄主岩石高Mo、Sn、Bi、W等高温热液成矿元素及Co、Ni、Cr等亲铁元素,而基性端元的暗色微细粒镁铁质包体及基性岩墙则异常富集轻稀土和Ba、Rb、Sr、Zr、Th、Hf、Nb等大离子亲石元素,贫Co、Ni、Cr等亲铁元素。微量元素的反常分布,指示了两个端元元素演化的显著依从性和交换性。LREE/HREE值在寄主岩石中为10～15,受岩浆混合作用影响在基性端元为9.98～13.5,异常富轻稀土。δEu值及(La/Sm)_N、(Gd/Yb)_N、(La/Yb)_N等比值,显示该岩体为混浆花岗岩。岩浆混合作用强烈的混浆暗色花岗岩具有显著的壳幔过渡性质。
- 花岗岩体 /
- 微量元素与稀土元素 /
- 岩浆混合 /
- 温泉 /
- 西秦岭
Abstract: The Wenquan granite,which lies in the western Qinling originates,is the product of the magma mixing of crust and mantlemagmas.The host rocks are characterized by higher hypothermal metallogenic elements suchas Mo,Sn,Bi and Was well as siderophile elements Co,Ni and Cr etc.The basic mafic magmatic enclave and basic dyke are rich in LREE and lithophile elements such as Ba,Rb,Sr,Zr,Th,Hf and Nb,but have poorer siderophile elements.The abnormal distribution of the trace elements indicates the noticeably exchanging and complying between the two terminal elements.The ratio of LREE HREE is 10-15 in host rocks,but is 9.98-13.5 in basic parts because of the magm as magm a mixing,namely,they abnormally enrich the LREE.The ratio of the δEu,(La/Sm)_N as well as (La/Yb)_N all indicate that this rockbody is amigmatized one,and the intensively migmatized monzonitic granite shows the markable transition between crust and mantle.
- granite /
- trace and REE elements /
- magma mixing /
- Wenquan /
- Western Qinling

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参考文献(16)

霍福臣,李永军.西秦岭造山带的建造与地质演化[M].西安: 西北大学出版社,1-100.

李永军,丁仨平,刘志武,等.西秦岭温泉花岗岩体的新认识[J].地质通报(待刊).

李永军,刘志武,丁仨平,等.西秦岭温泉花岗岩体的岩石学特征及岩浆混合标志[J].矿物岩石(待刊).

李永军,赵仁夫,李注苍,等.岩浆混合花岗岩微量元素成因图解尝试--以西秦岭温泉岩体为例[J].长安大学学报--地球科学版(待刊).

江万.中酸性侵入岩中铁镁质微粒包体及其意义[J].地质科技情报,1996,15(1): 13-18.

王涛.花岗岩混合成因研究及大陆动力学意义[J].岩石学报,2000,16(2): 161-168.

肖庆辉,邓晋福,马大铨,等.花岗岩研究思维与方法[M].北京: 地质出版社,2002,53-63.

Giorgio Rivalenti,Maurizio Mazzucchelli,Vicente Antonio,Vitorio Girarcli etc.Petrogenesis of the paleoproterozoic basalt-andesite-rhyolite dyke asso-ciation in the Carajas region,Amazonian craton[J].Lithos 1998,43: 235-265.

Collins W J.Evaluation of petrogenetic models for Lachlan Fold Belt granites: implications for crustal architecture and tectonic model[J].Australian jour.Of Sci.1998,45: 483-500.

李永军.洮坪地区花岗岩的成因类型研究[J].甘肃地质学报,1993,2(2): 45-53.

武汉地质学院.地球化学[M].北京: 地质出版社,1979.39-40.

赵振华.微量元素地球化学原理[M].北京: 科学出版社,71-73.

刘英俊,曹励明.元素地球化学导论[M].北京: 地质出版社,1987.57-80.

中国科学院贵阳地球化学所.华南花岗岩的地球化学[M].北京: 科学出版社,1979.212.

P.亨德森.稀土元素地球化学[M].北京: 地质出版社,1989.20-178.

王中刚,于学元,赵振华,等.稀土元素地球化学[M].北京: 科学出版社,1989.133-246.