|本期目录/Table of Contents|

[1]张慧明,郑常青,徐学纯,等.南非林波波带中央带Sand River地区高压麻粒岩变质作用[J].地球科学与环境学报,2016,38(05):612-622.
　ZHANG Hui-ming,ZHENG Chang-qing,XU Xue-chun,et al.Metamorphism of High-pressure Granulites in Sand River Area of the Central Zone of Limpopo Belt, South Africa[J].Journal of Earth Sciences and Environment,2016,38(05):612-622.
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第38卷
期数:
2016年第05期
页码:
612-622
栏目:
基础地质与矿产地质
出版日期:
2016-09-15

文章信息/Info

Title:
Metamorphism of High-pressure Granulites in Sand River Area of the Central Zone of Limpopo Belt, South Africa
文章编号:
1672-6561(2016)05-0612-11
作者:
张慧明; 郑常青; 徐学纯; 徐久磊; 韩晓萌; 周晓萍
吉林大学 地球科学学院，吉林 长春 130061
Author(s):
ZHANG Hui-ming;  ZHENG Chang-qing;  XU Xue-chun;  XU Jiu-lei;  HAN Xiao-meng;  ZHOU Xiao-ping
College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China
关键词:
变质作用; 高压麻粒岩; P-T轨迹; 林波波带; 大陆碰撞; Sand River 地区; 南非
Keywords:
metamorphism;  high-pressure granulite;  P-T path;  Limpopo Belt;  continental collision;  Sand River area;  South Africa
分类号:
P588.3
DOI:
-
文献标志码:
A
摘要:
南非林波波带中央带Sand River地区存在高压基性麻粒岩，其峰期矿物组合为石榴石+单斜辉石+石英+钛铁矿+磁铁矿。岩石学研究表明，该高压麻粒岩经历了两期退变质作用，早期退变质阶段以斜方辉石和斜长石的出现为特征，晚期退变质阶段以角闪石的出现为特征。传统温压计计算表明：高压麻粒岩峰期变质温度为820 ℃~900 ℃，压力为13.5~15.4 kbar；早期退变质的形成温压为800 ℃~890 ℃和8.8~11.2 kbar；晚期退变质条件为540 ℃~650 ℃和2.7~4.4 kbar。其退变质作用P-T轨迹为顺时针型近等温降压到降温降压的过程。高压麻粒岩经历的这种顺时针P-T轨迹通常发育在大陆碰撞环境，指示其形成可能与津巴布韦克拉通、卡普瓦尔克拉通在碰撞后地壳快速剥露事件有关，这对探讨林波波带中央带的构造演化具有重要意义。
Abstract:
High-pressure mafic granulite with a peak mineral assemblage of garnet+clinopyroxene+quartz+ilmenite+magnetite was found in Sand River area of the central zone of Limpopo Belt, South Africa. The highpressure granulite experiences two stages of retrograde metamorphism. Early retrograde metamorphic stage is characterized by the appearance of orthopyroxene and plagioclase; late retrograde metamorphic stage is characterized by the appearance of amphibole. P-T estimates suggests that the peak metamorphic conditions are 820 ℃-900 ℃ and 13.5-15.4 kbar, which retrogress from the postpeak phase at 800 ℃-890 ℃and 8.8-11.2 kbar to the amphibolite facies at 540 ℃-650 ℃and 2.7-4.4 kbar. The three stages define a clockwise P-T path with near-isothermal decompression and cooling following the peak highpressure metamorphism. The granulites experience this clockwise P-T- paths, and usually develop in the continental collision setting. It means that the formation of high-pressure granulite relates to the crust fast stripping event after the collision of Zimbabwe craton and Kaapvaal craton. It is important for exploring the tectonic evolution in the central zone of Limpopo Belt.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-05-19
基金项目:国家自然科学基金项目(41472164);国土资源部公益性行业科研专项经费项目(201011083)
作者简介:张慧明(1990-),女,辽宁沈阳人,理学硕士研究生,E-mail:huiming9876@qq.com。
通讯作者:郑常青(1962-),男,吉林榆树人,教授,博士研究生导师,理学博士,E-mail:zhengchangqing@jlu.edu.cn。
更新日期/Last Update: 2016-09-30