地质论评2025，Vol.71Issue(5)：1545-1563,19.DOI:10.16509/j.georeview.2025.01.025
胶莱盆地南缘五莲七宝山地区花岗斑岩年代学、地球化学特征及其地质意义
Geochronology,geochemistry and geological significance of granite porphyry in Qibaoshan area,Wulian County,southern margin of Jiaolai Basin
摘要
Abstract
The Jiaolai Basin is an important Au-Cu polymetallic metallogenic belt in eastern Shandong Province.The Qibaoshan subvolcanic complex in Wulian is a complex intrusives developed in the southern margin of the Jiaolai Basin,which is most closely related to the metallogenesis of Au-Cu polymetals.With the development of prospecting work in the outer and deep parts of the complex,the granite porphyry has been discovered in the deep part of the complex.On the basis of lithographic observation and zircon U-Pb dating of granite porphyry,this paper attempts to clarify the genetic type,provenance characteristics and tectonic environment of this rock mass through whole rock geochemistry and zircon Hf isotope analysis.Zircon U-Pb dating results show that the granite porphyry was formed in 120.0±0.3 Ma and 120.5±0.3 Ma,which is early Cretaceous.The granite porphyry as a whole is characterized by high Si,Al,Na,and low Fe,Mg.It is a weak peraluminous rock with high potassium calcium alkalinity,relatively enriched in light rare earth elements and large ion lithophile elements,and deficient in heavy rare earth elements and high field strength elements,with obvious Ta,Nb,Sr and Eu negative anomalies,belonging to type Ⅰ granite.The Hf isotopic composition of the zircon is obviously negative,and the mean age of the two-stage model is 2891 Ma,indicating that the magma originates from the Mesoarchaean ancient shell source material.Tectonic environment discrimination shows that the granite porphyry was formed in the post-orogenic tectonic environment after the plate subduction briefly extended,belongs to post-collision granite,and is basically consistent with the subduction of the Pacific plate to Eurasia and the magmatism related to mineralization in the region.关键词
锆石U-Pb定年/锆石Hf同位素/岩石地球化学/花岗斑岩/五莲七宝山/胶莱盆地南缘Key words
zircon U-Pb dating/Hf isotope/petrogeochemistry/granite porphyry/Qibaoshan area/southren margin of Jiaolai Basin引用本文复制引用
王欣,李双飞,战洪雷,唐名鹰,孙丽莎,张蕾,朱海波,华磊,朱伟,陈建..胶莱盆地南缘五莲七宝山地区花岗斑岩年代学、地球化学特征及其地质意义[J].地质论评,2025,71(5):1545-1563,19.基金项目
本文为国家重点研发计划(编号:2023YFC2906900) （编号:2023YFC2906900）
山东省重点研发计划(重大科技创新工程)(编号:2023CXGC011001) （重大科技创新工程）
泰山学者工程(编号:tstp20240847)和山东省地矿局第八地质大队总工基金项目(编号:DZG202403)的成果. This paper is the results of the National Key R&D Program of China(No.2023YFC2906900),Key R&D Program of Shandong(No.2023CXGC011001),Taishan Scholars Program(No.tstp20240847)and the General Engineering fund project of No.8 Geological Team of Shandong Provincial Bureau of Geology and Mineral Resources(No.DZG202403) （编号:tstp20240847）
