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[1]付建明,马昌前,谢才富,等.湘南西山铝质 A 型花岗质火山侵入杂岩的地球化学及其形成环境[J].地球科学与环境学报,2004,26(04):15-23.
　FU Jian-ming,MA Chang-qian,XIE Cai-fu,et al.Geochemistry and tectonic setting of Xishan aluminous A-type granitic volcanic-intrusive complex , Southern Hunan[J].Journal of Earth Sciences and Environment,2004,26(04):15-23.
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湘南西山铝质 A 型花岗质火山侵入杂岩的地球化学及其形成环境(PDF)

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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:: 第26卷
期数:: 2004年第04期

页码:: 15-23

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出版日期:: 2004-12-20

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Title:: Geochemistry and tectonic setting of Xishan aluminous A-type granitic volcanic-intrusive complex , Southern Hunan

作者:: 付建明¹; 2; 马昌前¹; 谢才富²; 张业明²; 彭松柏²; 1.中国地质大学地球科学学院,湖北武汉430074;2.宜昌地质矿产研究所,湖北宜昌443003

Author(s):: FU Jian-ming ¹; 2; MA Chang-qian ¹; XIE Cai-fu ²; ZHANG Ye-ming ²; PENG Song-bai ²; 1 .Facul ty of Ear th Sciences , China University of Geosciences , Wuhan 430074 , China ; 2.Y ichang Institute of Geology and Minera l Resources , Hubei Yi chang 443003 , China

关键词:: 火山侵入杂岩; A型花岗岩; 地球化学; 构造背景; 西山; 湖南; 南部

Keywords:: volcanic-intrusive complex ; A-type granite ; geochemistry ; tectonic setting ; Xishan ; Southern Hunan

分类号:: P588.12;P595

DOI:: -

文献标志码:: A

摘要:: 初步研究表明,以往被认为是典型的S型花岗质岩石的湘南西山火山侵入杂岩应为铝质A 型花岗质岩石。该杂岩富硅碱贫钙镁、K2O/Na2O>1、准铝过铝质0.94～1.26);FeO＊/MgO比值大平均12.05),高于M型,S型和I型花岗岩。在微量元素和稀土元素组成上,岩石富LREE,Ga,Y,Nb, Zr等大离子高场强元素及亏损Ni,Cr,Eu,Ti,V,P,Sr等,与国内外A型花岗岩相似。与一般A型花岗岩来源于I型花岗岩或大量抽提了S型花岗岩物质后的地壳源区不同,西山火山侵入杂岩的ISr) 0.71612～0.71823)较高,εNd-7.0～-8.0)较低,钕模式年龄1517～1600Ma)略小于区域上变质基底和中国东南部中生代花岗岩类的钕模式年龄,显示其直接来源于地壳物质的部分熔融,但可能有少量新生地幔物质的加入。西山铝质A型花岗质火山侵入杂岩是中侏罗世晚期挤压造山作用趋于结束,造山带崩塌,岩石圈强烈伸展减薄、热流值上升的构造背景下形成的造山后花岗质岩石。

Abstract:: Xishan volcanic-intrusive complex , with exposure area of about 705 km2 in Southern Hunan occurs in the western part of Nanling E-W tectonic magmatic belt .Petrochemically , the complex is metaluminous to peraluminous0 .94 ～ 1 .26) , rich in SiO2 , K2O+Na2O, poor in CaO , MgO , and is characterized by hig h FeO＊/ MgO ratio with an average of 12.05), which is similar to tho se of A-ty pe g ranite and different from the ordinary S- and I-type granites .Xishan complex is rich in Ga and Nb , Ta , Zr and other high field streng th elements , and depeleted in Sr , P, Eu , Ti, w hich can well be analogued to the know n A-type g ranites in the w orld .Iso to pically , the Complex is hig her in initial Sr ratios Isr =0 .716 12 ～ 0 .718 23) , lower in εNd -7 . 0 ～ -8 .0) ;their T2DM1 517～ 1 600 Ma)is slightly lower than those of the metamo rphic basement and Mesozoic granitoids in the southern-eastern China , indicating that the complex was mainly derived from crustal material, but had a little influence of mantle-derived materials.Based on the major and trace element data as w ell as isotopic features, it is suggested that Xishan volcanic- intrusive complex belong to the post-collisio nal aluminous A-type g ranite .I t is commonly accepted that A-type granite was derived from the I-type sources o r crustal sources from w hich S-type melt has been ex tracted.The preliminary study on Xishan volcanic- intrusive complex show s that A-ty pe g ranite can be directly derived from ty pical S-type crustal sources, its petrogenesis mechanism need further investig ation.Acco rding to the geolog ical characteristics and combining w ith the regional tectonic evolution, it is reasonable tha t the fo rmation of Xishan complex should be related to the asthenospheric upwelling and lithospheric ex tensio n and thinning during the Mesozoic .

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备注/Memo

备注/Memo:: [收稿日期]2004-01-17
[基金项目]中国地质调查局基础地质综合研究项目200313000041;200113900018)
[作者简介]付建明1964-),男,四川井研人,宜昌地质矿产研究所副研究员,中国地质大学博士研究生,现从事岩石地球化学研究工作。

更新日期/Last Update: 2004-12-20

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