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

卷:

第37卷

期数:

2015年第01期

页码:

1-11

栏目:

基础地质与矿产地质

出版日期:

2015-01-15

文章信息/Info

Title:

Granulite Facies Metamorphism, Partial Melting and Metasomatism in the Wuhe Complex at the Southeastern Margin of the North China Block

文章编号:

1672-6561(2015)01-0001-11

作者:

刘贻灿; 王程程; 张品刚; GROPPO Chiara; ROLFOFranco; 王安东

1. 中国科学院壳幔物质与环境重点实验室,安徽 合肥 230026; 2. 中国科学技术大学 地球和空间科学学院,安徽 合肥 230026; 3. 安徽省煤田地质局勘查研究院,安徽 合肥 230088; 4. 都灵大学 地球科学系,皮埃蒙特 都灵 10124

Author(s):

LIU Yi-can; WANG Cheng-cheng; ZHANG Pin-gang; GROPPO Chiara; ROLFO Franco; WANG An-dong

1. Key Laboratory of Crust-mantle Materials and Environments, Chinese Academy of Sciences, Hefei 230026, Anhui, China; 2. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China; 3. Exploration Institute of Anhui Coalfield Geology Bureau, Hefei 230088, Anhui, China; 4. Department of Earth Sciences, University of Torino, Torino 10124, Piedmont, Italy

关键词:

麻粒岩相; 多阶段变质作用; 部分熔融; 交代作用; 前寒武纪; 五河杂岩; 华北板块

Keywords:

granulite facies;  multistage metamorphism;  partial melting;  metasomatism;  Precambrian;  Wuhe complex;  North China Block

分类号:

P588.3

DOI:

-

文献标志码:

A

摘要:

华北板块东南缘五河杂岩属于前寒武纪变质基底,出露于蚌埠及相邻地区,主要由变质的镁铁质和长英质火成岩以及表壳岩系组成,并伴生有古元古代片麻状花岗岩和中生代花岗岩类,构成了“蚌埠隆起”。五河杂岩中主要有石榴斜长角闪岩/榴闪岩、石榴麻粒岩、异剥钙榴岩、石榴斜长角闪片麻岩、花岗片麻岩、云母片岩、大理岩和变质砂岩等岩石类型。这些不同类型的变质岩具有类似的峰期变质矿物,如石榴子石、单斜辉石、斜长石、金红石和石英等;结合其锆石U-Pb年龄,表明它们共同经历了古元古代高压麻粒岩相变质作用。石榴斜长角闪岩的石榴子石包体中存在钾长石+斜长石+石英+黑云母等矿物交生体,指示早期花岗质熔体的存在,证明五河杂岩在古元代变质过程中发生了部分熔融作用。此外,部分变基性岩中存在方解石、绿帘石和绿泥石等蚀变矿物,沿石榴子石的裂隙中分布有钾长石+斜长石+石英+黑云母+角闪石等矿物,表明它们经历了含碳酸盐的熔/流体交代作用以及绿帘石化和绿泥石化作用等。遭受过古元古代含碳酸盐的熔/流体交代作用的变基性岩表现为高放射成因Pb同位素组成,而未遭受含碳酸盐的熔/流体交代作用的变基性岩则表现为典型华北板块前寒武纪麻粒岩地体和下地壳包体岩石的低放射成因Pb同位素组成。

Abstract:

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备注/Memo:

收稿日期:2014-11-10
基金项目:国家自然科学基金项目(41273036);高等学校博士学科点专项科研基金项目(20133402130008)
作者简介:刘贻灿(1962-),男,安徽潜山人,教授,博士研究生导师,理学博士,E-mail:liuyc@ustc.edu.cn。

常用功能

更新日期/Last Update: 2015-02-04