新疆哈密大水一带天湖岩群斜长角闪岩地球化学特征、锆石U-Pb定年及地质意义
The Geochemical Features,Zircon U-Pb Dating and Significance of Tianhu Rock Group Amphibolites
韩飞 1曾华栋 2贾红旭 2李卫东 2张磊 3藏梅 4沈宏飞1
作者信息
- 1. 新疆工程学院新疆煤炭资源绿色开采教育部重点实验室,新疆 乌鲁木齐 830023
- 2. 新疆维吾尔自治区地质矿产勘查开发局第六地质大队,新疆哈密 839000
- 3. 华北地质勘查局综合普查大队,河北三河 065200
- 4. 新疆工程学院新疆煤炭资源绿色开采教育部重点实验室,新疆 乌鲁木齐 830023;新疆自然资源与生态环境研究中心,新疆 乌鲁木齐 830023
- 折叠
摘要
斜长角闪岩是天湖岩群分布较广的岩石之一.通过对天湖岩群斜长角闪岩的地质、岩石地球化学特征及年代学进行研究.结果表明,天湖岩群斜长角闪岩原岩为变质基性火山岩类,显示较复杂的地球化学特征.锆石U-Pb定年表明斜长角闪岩原岩可能形成于元古代(1 731±33)Ma,经历了中元古代的变质作用.综合分析认为,东天山天湖岩群出露的地区存在早元古代岩浆活动,可能发育太古代基底,斜长角闪岩经历了漫长且复杂的构造演化过程,与库鲁克塔格地区具有可比性,共同经历了 Columbia超大陆的聚合和裂解,同为中元古代早期Columbia超大陆裂解的产物,经历了哥伦比亚超大陆裂解向罗迪尼亚超大陆转换的过程.
Abstract
The Tianhu Rock Group contains a widespread distribution of amphibolites.This study investigates the geol-ogy,petrology,geochemistry,and geochronology of the amphibolites in the Tianhu Rock Group.The results indicate that the protolith of the Tianhu Rock Group's amphibolites is a metamorphosed mafic volcanic rock,exhibiting complex geo-chemical characteristics.Zircon U-Pb dating suggests that the protolith likely formed during the Proterozoic(1,731±33 Ma)and subsequently underwent metamorphism in the Mesoproterozoic.Integrative analysis suggests the presence of early Proterozoic magmatic activity in the exposed areas of the Tianhu Rock Group in eastern Tianshan,with a possible Archean basement.The amphibolites have experienced an extended and complex tectonic evolution,comparable to that of the Kuruktag region.Both regions underwent the assembly and breakup of the Columbia supercontinent,with the am-phibolites in particular representing an early Mesoproterozoic product of Columbia's disintegration.This progression re-flects the tectonic transition from the breakup of Columbia to the emergence of the Rodinia supercontinent.
关键词
天湖岩群/斜长角闪岩/地球化学/锆石U-Pb定年,地质意义Key words
Tianhu Rock Group/Amphibolites/Zir-con U-Pb dating/Geochemical characteristics/Significance引用本文复制引用
出版年
2024
NETL
NSTL
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