SHRIMP Zircon U-Pb Dating of Chajian Mafic-Ultramafic Rocks in Hongqiling Mine Field, Jilin Province, and Its Implications
详细信息
- 责任者：Hao Libo (College of Geoexploration Science and Technology ; Jilin University ; Changchun 130021 ; China) ; Sun Liji
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(2)
- 关键词：镍矿 ; nickel ores ; 容矿岩 ; host rocks ; 铀—铅计时 ; U-Pb dating ; 吉林 ; Jilin Province
- 页码：p.233-240
- 图表：illus., 3 tables, 20 refs.
- 分类号：1001
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
Chajian No.1 rock mass is the main ore-forming rock mass in Chajian deposit, its lithofacies include pyroxene-peridotite, olivine-pyroxene-amphibolite,Hornblende-pyroxenite, gabbro and diorite-pegmatite.The results of gabbro zircon SHRIMP U-Pb dating show that mafic-ultramafic rock masses formed in the Late Triassic and the age is 239.6±2.6 Ma. The existing age data of mafic-ultramafic rocks indicate that the formation age of the rock masses become new in turn from southwest to northeast. The formation age of Chajian No.1 rock mass is earlier than that of Hongqiling rock mass significantly, age difference between them can reach 20 Ma. Mafic-ultramafic magmatism activities in Hongqiling district began before 240 Ma and lasted for a long time. The finding of 1.7 Ga and 0.6 Ga zircon cores is direct evidence of magma mixed with crustal material. The ages of captured zircons are corresponding with those of Neoproterozoic and Mesoproterozoic tectonic heat events in the North China Platform, suggesting that their origin is North China platform basement.
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