胶南造山带日照地区的荆山岩群  

JINSHAN GROUP IN JIAONAN TECTONIC BELT IN RIZHAO AREA

作　　者：宋余理 

机构地区：[1]山东省第八地质矿产勘查院

出　　处：《山东地质》1997年第2期32-43,39-43,共12页Geology of Shandong

摘　　要：近年来的1：5万区域地质调查成果表明，发育于胶南造山带日照地区的变质岩系，为一套以变质变形的侵入体为主，其中含有不同地质年代地层包体的变质杂岩。笔者等通过区域对比，将这套变质岩系中的变质地层厘定为胶东芝群及荆山岩群。胶东岩群仅出露苗家岩组，岩性单一，分布零星。荆山岩群发育相对较齐全，有野头岩组及陡崖岩组，主要岩石组合为黑云变粒岩、透辉透间变粒岩、石墨透辉变粒岩、富黑云变粒岩、黑云（二云）片岩、线粒岩、大理岩、石英岩、斜长角闪岩及石榴蓝晶片岩等，其原岩为一套浅海相泥砂质碎屑岩、泥岩夹火山岩、碳酸盐岩的沉积建造。日照地区荆山岩群与胶北地区的荆山群具有大致相同的岩石组合、原岩建造及大地构造环境。取自其陡崖岩组中变质岩石的错石U－Pb年龄为2146．8Ma和2279．2Ma，其时代应属古元古代。As shown by the regional geological survey result with the scale of 1: 50, 000, the metamorphic rock system developed in the Jiaonan tectonic belt in Rizhao area is a series of metamorphic and deformed intrusive rocks, including metamorphic complex with inclusions of different geological layers. According to the regional comparasion, the metamorphic systems can be divided into Jiaodong group and Jinshan group. Only Miaojia formation emerged. It has simple lithology and distributes sporadically. Jinshan group has developed completely including Yetou formation and Douya formation. Major rock associations are biotite granulitite, diopsied and tremolite granulitite, graphite and tremolite granulitite,biotite gneiss ,leucogranulitite, marble, quartzite, amphibolite and garnet kyanite schist, etc.Its protolith is a sedimentary foundation of shallow -sea facies pelitic arenaceous fragmental rocks, mudstones with magmatic rocks and carbonate rocks. Compared with the Jinshan group in the northern Shandong, the Jinshan group in Rizhao area has a similiar rock association t protolith foundation and geotectonic environment. According to the U - Pb age obtained from the metamorphic rocks of Douya formation which is 2146. 8Ma and 2279. 2Ma, respectively. the Jinshan group belongs to the Paleoproterozoic.

关 键 词：造山带 胶南造山带 日照地区 荆山岩群 

分 类 号：P542.2[天文地球—构造地质学]