中国东部富钾埃达克岩成因的实验约束

RobertP.PAPP 肖龙 等. 中国东部富钾埃达克岩成因的实验约束[J]. 岩石学报, 2002, 18(3): 293-302.
引用本文: RobertP.PAPP 肖龙 等. 中国东部富钾埃达克岩成因的实验约束[J]. 岩石学报, 2002, 18(3): 293-302.
Rapp R P,Xiao L and Shimizu N. 2002. 1. Department of Geosciences and Mineral Physics Institute,State University of New York,Stony Brook,New York 11794 2100,USA2. Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Wushan,Guangzhou 510640,China3. Woods Hole Oceanographic Institution,Woods,Hole,Massachusetts 02543,USA. Experimental constraints on the origin of potassium-rich adakites in eastern China.[J]. Acta Petrologica Sinica, 2002, 18(3): 293-302.
Citation: Rapp R P,Xiao L and Shimizu N. 2002. 1. Department of Geosciences and Mineral Physics Institute,State University of New York,Stony Brook,New York 11794 2100,USA2. Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Wushan,Guangzhou 510640,China3. Woods Hole Oceanographic Institution,Woods,Hole,Massachusetts 02543,USA. Experimental constraints on the origin of potassium-rich adakites in eastern China.[J]. Acta Petrologica Sinica, 2002, 18(3): 293-302.

中国东部富钾埃达克岩成因的实验约束

  • 基金项目:

    the grant of the National Science F oundation of the United States:Petrogenesis of Archean Granitoidsand Implications for the Geochemical Evolution of Cratonic Lithosphere( EAR-0 0 0 3 63 8)

  • Adakite在地球化学上具明显特征的火山岩和深成花岗岩类岩石,见于洋内岛孤环境和大陆孤,如安底斯孤。在洋内岛孤,由热的消减的大洋岩石圈熔融形成(叫做“板片熔融”),而在大陆孤,熔融曾发生在构造或岩浆加厚的下地壳底(叫做“下地壳熔融”)。在这两种产状环境中,adakite的鲜明地球化学特征被认为是起因子,一种不同程度含水的变质基性原岩在足够深度上的部分熔融,这里的足够深度是指可使石榴子石在残余结晶组合(即石榴角闪石和/或榴辉石的残余)中保持稳定的深度。“原始”或“母”adakite熔体一旦形成,便可能在其向上运移和侵位上地壳期间受到同化作用(或是地幔,或是大陆物质)和结晶分异作用的改造。中国东部晚中生代(早中白垩世,160-110Ma)的adakite,与见于同一地区和其它地方的钠质adakite相比,通常富含钾(K2O)和其它大离子亲石元素(如Ba,Th,U),有较低的Na2O/K2O比值(-1.0-1.1),类似于玄武岩在石榴角闪岩-榴辉岩相含水熔融实验中所产生adakite熔体,要么是由洋壳板片熔融所形成,要么是由不同成分的玄武质下地壳原岩部分熔融所形成。尽管有些成分差异,它们的总体化学特征仍然可将中国东部的富钾花岗岩类岩石定均adakite。我们把这些富钾的adakite的独特化学行特征,归因于成分来源的特殊性,或adakite母岩浆遭受了同化混染和结晶分异(AFC)作用的改造。虽然中国东部与消减带环境明显不同这一点表明,那里的adakite可由板块底部侵位的(岩浆加厚的)镁铁质下地壳部分熔融所形成,但燕山运动期间中国东部存在“平坦”俯冲的地球动力学环境是可能被排除的。
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