西北地质2017，Vol.50Issue(1)：227-238,12.
内蒙古敖汉旗斜长角闪岩锆石U-Pb年龄及地球化学特征
Zircon U-Pb Ages and Geochemical Characteristics of the PlagioclaseAmphibolite in the Aohan Banner, Inner Mongolia
摘要
Abstract
A series of intermediate metamorphic rocks,discovered in Aohan Banner, Chifeng City, Inner Mongolia, was characterized by plagioclase amphibolite, marble and granulite.The LA-ICP-MS zircon U-Pb dating and petrographic tests on the plagioclase amphibolites have been completed in this paper.According to petrological and geochemical characteristics, the metamorphic rock series has been classified as a set of basic calc-alkaline volcanic rocks and sedimentary rocks.The source rock of plagioclase amphibolite is similar to intraplate basalt, which was formed by the crustal or lithospheric contaminationin extensional environment.LA-ICP-MS zircon U-Pb dating of the plagioclase amphibolites yielded four groups of weighted mean 206Pb/238U ages.In which, the ages of (498±13)Ma, (434±16)Ma and (390.4±6.8)Ma stand for the age of trapped zircon, while the age of (351.2 ± 5.2)Ma for magmatic zircon represents the crystallization time of the volcanic rocks, belonging to early stage of Early Carboniferous Epoch.关键词
斜长角闪岩/锆石U-Pb年龄/地球化学特征/敖汉旗Key words
plagioclase amphibolite/zircon U-Pb dating/geochemical characteristics/Aohan分类
天文与地球科学引用本文复制引用
李斌,陈井胜,刘淼,李伟,吴振,杨帆..内蒙古敖汉旗斜长角闪岩锆石U-Pb年龄及地球化学特征[J].西北地质,2017,50(1):227-238,12.基金项目
中国地质调查局"内蒙古1∶5万敖汉旗、捣格朗营子、新地、铁匠营子幅区域地质矿产调查"(1212011120662),"内蒙古敖汉旗大黄花地区矿产地质调查"(12120114055501),"大兴安岭成矿带突泉-翁牛特地区地质矿产调查"(DD20160201),"辽宁1∶5万台吉、他拉皋、七道岭、十二台营子幅区域地质调查"(DD20160201-05) （1212011120662）
