华北克拉通东南部太古宙英云闪长岩—奥长花岗岩—花岗闪长岩形成及演化  

Formation and evolution of Archean TTG in southeastern North China Craton

作　　者：刘磊[1,2] 康诗胜 刘恒 胡天杨[1,2] 周炜鉴 张云飞 LIU Lei;KANG Shisheng;LIU Heng;HU Tianyang;ZHOU Weijian;ZHANG Yunfei(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Educationin Central South University,Changsha,410083;School of Geosciences and Info-Physics,Central South University,Changsha,410083;Natural Resources department,Hunan College of Engineering Vocational Technology,Changsha,410083)

机构地区：[1]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083 [3]湖南工程职业技术学院自然资源学院,长沙410083

出　　处：《地质论评》2023年第1期49-75,共27页Geological Review

基　　金：国家自然科学基金资助项目(编号:41972198);湖南省科技创新团队项目(编号:2021RC4055);湖南省自然科学基金资助项目(编号:2022JJ30702)的成果。

摘　　要：华北克拉通是世界范围内少数保存有大量太古宙英云闪长岩—奥长花岗岩—花岗闪长岩(TTG)及多期次岩浆事件记录的克拉通之一,相关研究对揭示全球太古宙时期壳—幔动力学演化过程具有重要的指示意义。笔者等在华北克拉通东南部归纳总结了52个太古宙时期TTG岩石样品的有效地球化学资料。根据地区与岩石成因差异,将样品主要分为3类:霍邱、五河地区低铝、低压型TTG岩石,鲁西(C带)、丰县张河地区中铝、中低压型TTG岩石以及登封地区高铝、高压型TTG岩石。华北克拉通东南部的TTG片麻岩经历了两期明显的地壳生长事件:2.95~2.70 Ga,2.58~2.48 Ga(峰值为约2.52 Ga)。主、微量数据表明,华北克拉通东南部的TTG片麻岩主体源于低钾镁铁质岩石的部分熔融,并且源区可能受到来自于壳—幔相互作用的影响。其中,霍邱、登封地区的TTG分别受到流体、熔体交代作用;鲁西和张河地区则同时受到熔体和流体交代作用。霍邱地区TTG片麻岩形成于约2.70 Ga,成因可能受鲁西地区地幔柱垂向构造的影响;太古宙末期,鲁西及张河地区与登封地区TTG片麻岩的形成具有一定联系,主要表现为受洋内岛弧地体侧向的洋内俯冲与弧陆碰撞增生控制,并经历了区域麻粒岩相变质作用。The North China Craton( NCC) is one of the cratons that preserve a large number of Archean Tonalite—Trondhjemite—Granodiorite(TTG) rocks and multi-stage magmatic events. The related studies of NCC have important implications for revealing the late Archean crust—mantle dynamic evolution. This paper collects and arranges the valid geochemical data of 52 Archean TTG gneiss samples in the Xuhuai area, which is located in the southeastern of NCC. According to the distribution of region and petrogenesis, it can be divided into three parts: the low-aluminum and low-pressure TTG rocks in the southeast(Huoqiu and Wuhe) of the Xuhuai area, the medium-aluminum and medium—low-pressure TTG rocks in the north—central(Western Shandong C belt and Zhanghe), and the high-aluminum and high-pressure TTG rocks in the western area(Dengfeng). The TTG gneiss in the Xuhuai area has significantly two stages crustal growth: 2. 95 ~ 2. 70 Ga, 2. 58 ~ 2. 48 Ga(peak value ~ 2. 52 Ga). Based on analysis of major and trace elemental data, it is proposed that they are properly sourced from the partial melting of low-K mafic rocks and the magma source area of TTG gneiss may be affected by the mixture of crust—mantle interaction. The source region of Huoqiu TTG had subjected to fluid metasomatism, whereas the the source region of Dengfeng magma had suffered melt metasomatism. The magma source regions of Western Shandong and Zhanghe had experienced both melt and fluid metasomatism. Tectonic systems show that mantle plume vertical structure may impact the generation of TTG gneiss in the Huoqiu area. In the late Archean, western Shandong and Zhanghe areas may have a relationship of TTG gneiss forming especially lateral intra-oceanic subduction and arc—continent collision accretion control of intra-oceanic island arc terrane, and experienced regional granulite facies metamorphism.

关 键 词：TTG片麻岩 壳—幔相互作用 华北克拉通 弧陆增生 

分 类 号：P542[天文地球—构造地质学] P581[天文地球—地质学]