[1]陈国楷,张 健,尹常青.2021.华夏地块东南缘放鸡岛地区花岗质岩石锆石U-Pb年代学、地球化学特征及其构造意义.大地构造与成矿学,45(5):983-1006.doi:10.16539/j.ddgzyckx.2021.05.009
　CHEN Guokai,ZHANG Jian,YIN Changqing.2021.Zircon U-Pb Dating, Geochemical Characteristics of the Fangjidao Granitic Rocks in the Southeasternmost Cathaysia Block and Their Tectonic Implications.Geotectonica et Metallogenia,45(5):983-1006.doi:10.16539/j.ddgzyckx.2021.05.009
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华夏地块东南缘放鸡岛地区花岗质岩石锆石U-Pb年代学、地球化学特征及其构造意义
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2021年45卷05期
页码:
983-1006
栏目:
岩石大地构造与地球化学
出版日期:
2021-10-25

文章信息/Info

Title:
Zircon U-Pb Dating, Geochemical Characteristics of the Fangjidao Granitic Rocks in the Southeasternmost Cathaysia Block and Their Tectonic Implications
文章编号:
1001-1552(2021)05-0983-024
作者:
陈国楷1、2;  张 健1、2*;  尹常青1、2;  刘 锦1、2;  余晨颖1、2;  俞鑫源1、2;  刘明飞1、2
1.广东省地球动力作用与地质灾害重点实验室, 中山大学 地球科学与工程学院, 广东 广州 510275; 2.南方海洋科学与工程广东省实验室(珠海), 广东 珠海 519082
Author(s):
CHEN Guokai1、2;  ZHANG Jian1、2*;  YIN Changqing1、2;  LIU Jin1、2;  YU Chenying1、2;  YU Xinyuan1、2 and LIU Mingfei1、2
1. Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, SUN Yat-sen University, Guangzhou 510275, Guangdong, China; 2. Southern Laboratory of Ocean Science and Engineering, Zhuhai 519082, Guangdong, China
关键词:
华夏地块;  放鸡岛;  早古生代;  陆内造山;  花岗质岩石;  锆石U-Pb定年
Keywords:
Cathaysia Block;  Fangjidao area;  early Paleozoic;  intra-plate orogeny;  granite;  zircon U-Pb dating
分类号:
P581; P597
DOI:
10.16539/j.ddgzyckx.2021.05.009
文献标志码:
A
摘要:
粤西放鸡岛地区位于华夏地块东南缘, 广泛出露强烈深熔且剪切变形的花岗质岩石, 主要以眼球状花岗质片麻岩为主, 但其形成时代及成因研究十分薄弱, 其是否与邻区(如云开地区等)经历了相似的早古生代构造演化并不确定。本次通过对放鸡岛出露的花岗质岩石进行了LA-ICP-MS锆石U-Pb定年, 同时开展了全岩地球化学和锆石Hf同位素研究, 以探讨其岩石成因及其构造背景。锆石U-Pb定年结果表明, 强烈深熔且变形的花岗质片麻岩形成于早志留世(436~432 Ma), 并保留了众多中-新元古代(1183~700 Ma)的继承锆石。侵入到该花岗质片麻岩中的未变形花岗质岩脉结晶年龄为~427 Ma, 据此限定了放鸡岛地区深熔变形时代为436~427 Ma。同时, 两种岩性样品都显示出相似的地球化学和Hf同位素特征。花岗质片麻岩与未变形的花岗质岩脉样品的铝饱和指数A/CNK比值为1.10~1.24, 均显示出过铝质特征。LREE/HREE值为2.07~3.98, (La/Yb)N值为5.93~22.27, 富集轻稀土元素, 并具有强烈的Eu负异常。锆石εHf(t)值显示强烈负值(-22.8~-4.3), tDM2为2820~1688 Ma, 平均值为2028 Ma, 表明该区花岗质岩石来源于华夏地块古老地壳物质的部分熔融。综合研究显示放鸡岛花岗质岩体与邻区(如云开地区)花岗质岩石具有相同的岩石成因, 属华南早古生代陆内造山作用伸展构造背景下深熔作用的产物。
Abstract:
Early Paleozoic granites are widely distributed in the Fangjidao area, the western Guangdong province, i.e., the southeastern Cathaysia Block. They experienced intensive shearing zone deformation and metamorphism, and now occur as mylonized granitic gneiss. The later undeformed monzogranitic veins intruded and truncated the major foliation of the granitic gneiss. However, the crystallization age, petrogenesis and deformation characteristics of these granites are poorly constrained, which hinder our understanding of the tectonic evolution of the region and its relation to the Cathaysia Block. LA-ICP-MS zircon U-Pb dating results show that the granitic gneisses contain abundant inherited zircon of ca. 1183-700 Ma, and have crystallization age of 436-432 Ma. In contrast, the undeformed monzogranitic veins have a younger crystallization age of ~427 Ma. This can well bracket the timing of regional anatexis and regional deformation in 436-427 Ma. The granitic gneisses and monzogranite samples are characterized by a peraluminous signature with A/CNK values varying from 1.10 to 1.24. The rocks are enriched in LREE, with LREE/HREE ratios ranging from 2.07 to 3.98, and (La/Yb)N from 5.93 to 22.27 (mean value is 10.36). All the samples exhibit distinct negative Eu anomalies. Zircon crystals from the granitic rocks have negative εHf(t) values mainly ranging from -22.8 to -4.3, with two stage model ages of 2820-1688 Ma. New data of this study reveal that the Early Paleozoic granitic rocks in the Fangjidao area were generated by partial melting of the Paleoproterozoic crustal components. Combined with the previously published data, we infer that the granitic rocks in the Fangjidao area have a similar origin with the coeval granites in the adjacent areas (e.g. the Yunkai area). They were most likely derived from partial melting of the crustal materials during the extension stage of the intra-plate orogeny.

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备注/Memo

备注/Memo:
收稿日期: 2020-07-19; 改回日期: 2020-08-23 项目资助: 广东省引进人才创新团队(2016ZT06N331)和国家级大学生创新创业训练计划项目(201810558204)联合资助。 第一作者简介: 陈国楷(1996-), 男, 硕士研究生, 构造地质学专业。Email: chengk8@mail3.sysu.edu.cn 通信作者: 张健(1978-), 男, 教授, 博士生导师, 从事造山带相关的构造地质学研究。Email: zhangjian@mail.sysu.edu.cn
更新日期/Last Update: 2021-09-20