维普中文期刊产品整合服务

Paleoproterozoic Granitoids on Liaodong Peninsula, North China Craton

查看全文 作　　者：ZHU [1]Kai;LIU [2]Zhenghong;XU [2]Zhongyuan;LIU [2]Jiexun;WANG Xing’[3]an 高影响力作者 机构地区：[1]College of Geo-exploration Science and Technology,Jilin University,Changchun 130061,China;[2]College of Earth Sciences,Jilin University,Changchun 130061,China;[3]College of Geographical Sciences,Northeast Normal University,Changchun 130024,China高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2019年第93卷第5期,共20页高影响力期刊 基　　金：financially supported by the 3D Geological Mapping and Deep Geological Survey of the China Geological Survey under a pilot project entitled Deep Geological Survey of the Benxi–Linjiang Area (Project No. 1212011220247) 摘　　要：Paleoproterozoic granitoids are an important constituent of the Jiao-Liao-Ji Belt(JLJB). The spatial-temporal distribution and types of Paleoproterozoic granitoids are closely related to the evolution of the JLJB. In this paper, we review the field occurrence, petrography, geochronology, and geochemistry of Paleoproterozoic granitoids on Liaodong Peninsula, northeast China. The Paleoproterozoic granitoids can be divided into pre-tectonic(~2.15 Ga;peak age=2.18 Ga) and post-tectonic(~1.85 Ga) granitoids. The pre-tectonic granitoids are magnetite and hornblende-biotite monzogranites and granodiorites. Pre-tectonic monzogranites are widespread in the JLJB and have A2-type affinities. In contrast, pretectonic granodiorites are only present in the Simenzi area and have adakitic affinities. The post-tectonic granitoids consist of porphyritic monzogranite, syenite, diorite, granodiorite, quartz monzonite, monzogranite, and granitic pegmatite, which are adakitic rocks and I-, S-, and A2-type granitoids. The assemblage of pre-tectonic A2-type granitoids and adakitic rocks indicates the initial tectonic setting of the JLJB was a continental back-arc basin. The assemblage of post-tectonic adakitic rocks and I-, S-, and A2-type granitoids indicates a post-collisional setting. The 2.20-2.15 Ga A2-type granitoids and adakitic rocks were associated with the initial stage of back-arc extension, and the peak of back-arc extension is inferred from the subsequent(2.15-2.10 Ga) mafic intrusive activity. The ~1.90 Ga adakitic rocks mark the beginning of the postcollisional stage, which was followed by the intrusion of low-temperature S-and I-type granitoids. High-to low-pressure granitoids(S-type) were generated during the peak of post-collisional lithospheric delamination and asthenospheric upwelling. The emplacement of later granitic pegmatites occurred during the waning of the orogeny. 关 键 词：PALEOPROTEROZOIC GRANITOIDS pre-tectonic post-tectonic POST-COLLISION continental BACKARC basin Jiao-Liao-Ji Belt
相关文献

参考文献(125)

引证文献(3)

耦合文献(2559)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费