Zircon U-Pb Ages and Geochemical Characteristics of the Plagioclase Amphibolite in the Aohan Banner, Inner Mongolia
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摘要: 内蒙古赤峰市敖汉旗出露一套岩性为斜长角闪岩、大理岩、变粒岩等为主的中级变质岩系，笔者对斜长角闪岩进行了LA-ICP-MS锆石U-Pb测年和岩石地球化学测试。根据岩石学及地球化学特征，可知该变质岩系原岩为一套钙碱性系列基性火山岩及沉积岩组合；斜长角闪岩原岩是伸展构造背景下形成的受到地壳或岩石圈混染的板内玄武岩。在斜长角闪岩中获得4组年龄，其中（498±13）Ma、（434±16）Ma、（390.4±6.8）Ma为捕获锆石年龄；（351.2±5.2）Ma应代表了该基性火山岩的形成年龄，为早石炭世早期。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.
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Keywords:
- plagioclase amphibolite /
- zircon U-Pb dating /
- geochemical characteristics /
- Aohan
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