北苏鲁超高压变质带前寒武纪基底研究新进展  

Main Progresses in the Study of Precambrian Basement of the North Sulu Ultra-high Pressure Metamorphic Belt,Eastern China

作　　者：徐扬[1,2] 杨坤光[3,4] 李日辉[1,2] 侯方辉[1,2] 秦亚超[1,2] 

机构地区：[1]国土资源部海洋油气与环境地质重点实验室,山东青岛266071 [2]青岛海洋地质研究所,山东青岛266071 [3]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [4]中国地质大学地球科学学院,湖北武汉430074

出　　处：《现代地质》2013年第2期248-259,共12页Geoscience

基　　金：国土资源部海洋油气资源与环境地质重点实验室开放基金项目(MRE201214);国土资源部海洋区域地质调查项目(GZH200800501)

摘　　要：北苏鲁超高压变质带位于胶东牟平—即墨断裂以东的地区,其前寒武纪基底以出露新元古代的双峰式火成岩为主要特征,其主要岩石组合包括大量花岗片麻岩以及少量变(超)基性岩(榴辉岩)、变沉积岩。对花岗片麻岩、变质(超)基性岩的岩石组合、地球化学、锆石U-Pb和Lu-Hf同位素的研究表明,北苏鲁存在新太古代—古元古代的残留地壳,经历了1.8～2.2 Ga期间的岩浆-火山-变质事件;新元古代中期(0.72～0.80 Ga)与Rodinia超大陆的裂解相关的岩浆活动促使地壳的生长和再造,形成了北苏鲁的前寒武纪基底的主体;北苏鲁和苏鲁—大别造山带一样,其前寒武纪基底是扬子板块北缘的一部分,苏鲁造山带的西北边界是五莲—烟台断裂带。The north Sulu ultra-high pressure （UHP） metamorphic belt which is located at the eastern MupingJimo fault in eastern Shandong Peninsula is mainly characterized by Neoproterozoic bimodal igneous rocks. And its assemblages include a large number of granitic gneiss and a small amount of ultra basic/basic metamorphic rocks and metasedimentary rocks. The previous research of geochemical, zircon U-Pb, Lu-Hf isotope data revealed the geologic succession of the north Sulu UHP terrane. The Neoarchean-Paleoproterozoic ancient crust was remained and its initial ernst evolution might start from Neoarehean or even earlier, then it undergone a se- ries of magma-volcano-metamorphic events during 1.8 - 2.2 Ga. The bimodal magmatism, which caused by the rifting of the Rodinia Supercontinent at mid-Neoproterozoic （0.7 -0. 8 Ga） reworked the ancient and juvenile crust. As the same to the Sulu-Dabie orogen terrane, some characteristics of the Precambrian basement of the north Sulu UHP terrane are corresponding to Yangtze Block, and its northwestern boundary to the North China Block may be located along the Wulian-Yantai fault.

关 键 词：花岗片麻岩 榴辉岩 氧同位素 铪同位素 北苏鲁超高压变质带 

分 类 号：P534.1[天文地球—古生物学与地层学] P542[天文地球—地质学]