山东省胶南地区斜长花岗岩的发现
THE DISCOVERY OF PLAGIOGRANITE IN THE JIAONAN AREA, SHANDONG PROVINCE
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摘要: 胶南地区斜长花岗岩与中元古代变辉长岩相伴产出,由60%的斜长石和40%的石英组成。化学成分以高硅、低至中等的铝、低K2O为特征,与大洋斜长花岗岩相似。其单颗粒锆石Pb Pb同位素年龄是(1370.6±14.3)Ma。Abstract: Plagiogranite was discovered in the Jiaonan area, Shandong province. It occurs in association with Middle Proterozoic metagabbro. The rock consists of 60% plagioclase and 40% quartz and has high Si, low to moderate Al and low K2O, being similar in chemical composition to oceanic plagiogranite. Its Pb Pb age of single grain zircon is (1 370.6±14.3) Ma.