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华北克拉通东部辽河群中两类斜长角闪岩年代学、地球化学特征及其地质意义
投稿时间:2020-04-29  修订日期:2020-06-15  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021113
摘要点击次数: 91
全文下载次数: 106
作者单位地址
杨玉伟 辽宁省物测勘查院有限责任公司 辽宁省沈阳市皇姑区宁山中路42号羽丰大厦
于海峰 辽宁省物测勘查院有限责任公司 
石玉学 辽宁省物测勘查院有限责任公司 
吴奇 辽宁省物测勘查院有限责任公司 
孙海洋 辽宁省物测勘查院有限责任公司 
韩雪 辽宁省物测勘查院有限责任公司 
张言珑 辽宁省物测勘查院有限责任公司 
余超 辽宁省地质矿产调查院有限责任公司 辽宁省沈阳市皇姑区宁山中路42号羽丰大厦
基金项目:中国地质调查局地质调查项目(编号 DD20160049-9)
中文摘要:对辽东桓仁地区辽河群高家峪组中出露的斜长角闪岩进行岩石学、地球化学及年代学研究,显示高家峪组中的斜长角闪岩原岩为基性玄武岩,可划分为低Ti-E-MORB及高Ti-OIB两种类型:低Ti型样品原岩属拉斑玄武岩系列,轻微亏损Nb、Ta、Zr,明显亏损P,弱轻稀土富集、重稀土亏损,具有E-MORB地球化学特征;高Ti样品原岩属碱性玄武岩系列,富集Rb、Th、U等大离子亲石元素,轻稀土富集、重稀土亏损,具有OIB地球化学特征。两类斜长角闪岩具有较低的MgO、Cr、Ni含量及Mg#值,说明它们原岩不是原始岩浆,而是通过不同矿物相分离结晶作用形成。锆石U-Pb测年表明低Ti型和高Ti型斜长角闪岩成岩年龄分别为2158±15Ma、2173±12Ma,变质年龄分别为1870±6Ma、1861±7Ma。区域地质特征及岩石成因研究共同指示两类斜长角闪岩形成于弧后盆地环境,辽吉地区在古元古代早期可能处于活动大陆边缘弧后盆地构造环境,辽吉造山带的形成与弧-陆碰撞有关。
中文关键词:辽河群  锆石U-Pb  斜长角闪岩  弧后盆地  辽吉造山带
 
Chronology, geochemical characteristics and geological significance of two types of amphibolites within the Liaohe Group in the eastern block of the North China Craton
Author NameAffiliationAddress
YANG Yuwei Geophysical Measuring Xeploration Institute of Liaoning Province,Shenyang 辽宁省沈阳市皇姑区宁山中路42号羽丰大厦
YU Haifneg Geophysical Measuring Xeploration Institute of Liaoning Province,Shenyang 
Shi Yuxue Geophysical Measuring Xeploration Institute of Liaoning Province,Shenyang 
Wu Qi Geophysical Measuring Xeploration Institute of Liaoning Province,Shenyang 
SUN Haiyang Geophysical Measuring Xeploration Institute of Liaoning Province,Shenyang 
HAN Xue Geophysical Measuring Xeploration Institute of Liaoning Province,Shenyang 
ZHANG Yanlong Geophysical Measuring Xeploration Institute of Liaoning Province,Shenyang 
YU Chao Liaoning Survey Academy of Geology and Mineral Resources InvestigationShenyang 辽宁省沈阳市皇姑区宁山中路42号羽丰大厦
Abstract:Petrology, geochemistry and zircon U-pb chronology were studied on the amphibolite in Gaojiayu Formation of Liaohe Group in Huanren area, eastern Liaoning Province. The results show that the original rock of amphibolite is basalt and can be divided into two types: low Ti and high Ti. The original rock of the low-Ti sample belongs to tholeiite series, with slight loss of Nb, Ta and Zr, obvious loss of P, and weak enrichment of light rare earth and heavy enrichment of rare earth, showing the geochemical characteristics of E-MORB. The original rock of the high Ti sample belongs to alkaline basalt series, with enrichment of large ionic lithophile elements such as Rb, Th and U, and enrichment of rare earth and loss of heavy rare earth, showing the geochemical characteristics of OIB. The two types of amphibolites have low contents of MgO, Cr, Ni and Mg# values, indicating that their protoliths are not primitive magma, but formed by separate crystallization of different mineral phases. The U-Pb dating of zircon indicates that the diagenetic ages of the low Ti type and the high Ti type are 2158±15 Ma and 2173±12 Ma, and the metamorphic ages are 1870±6 Ma and 1861±7 Ma. There are obvious differences in the geochemical characteristics of the two types of amphibolite, which indicates that there is no transitional relationship between them. The regional geological characteristics and petrogenetic studies jointly indicate that the two types of plagioclase were formed in the back-arc basin environment. Based on the available petrology, geochemistry and isotopic characteristics, the Liaoji area may have been in the tectonic environment of the back-arc basin of the active continental margin in the early Paleoproterozoic, and the formation of the Liaoji orogenic belt is related to the arc-land collision.
keywords:Liaohe Group  Zircon U-Pb chronology  amphibolite  back-arc basin  Liao-Ji belt
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