Zircon U-Pb Ages and Geochemical Characteristics of the Plagioclase Amphibolite in the Aohan Banner, Inner Mongolia

LI Bin; CHEN Jingsheng; LIU Miao; LI Wei; WU Zhen; YANG Fan

Northwestern Geology > 2017 > 50(1): 227-238.

LI Bin, CHEN Jingsheng, LIU Miao, et al. Zircon U-Pb Ages and Geochemical Characteristics of the Plagioclase Amphibolite in the Aohan Banner, Inner Mongolia[J]. Northwestern Geology, 2017, 50(1): 227-238.

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Zircon U-Pb Ages and Geochemical Characteristics of the Plagioclase Amphibolite in the Aohan Banner, Inner Mongolia

Shenyang Center of Geology Survey, CGS, Shenyang 110034, Liaoning, China

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Received Date: October 07, 2016
Revised Date: November 19, 2016
Available Online: July 28, 2022
Published Date: March 04, 2017

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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.
- plagioclase amphibolite,
- zircon U-Pb dating,
- geochemical characteristics,
- Aohan

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Zircon U-Pb Ages and Geochemical Characteristics of the Plagioclase Amphibolite in the Aohan Banner, Inner Mongolia

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