U-Pb Zircon Geochronology of the Zijinshan Alkaline Intrusive Complex, Shanxi Province, and Its Geological Significance by Using LA-ICP-MS
详细信息
- 责任者：Zhang Hongfa (State Key Laboratory of Continental Dynamics ; Northwest University ; Xi’an 710069 ; China) ; Chen Gang
- 刊名：Acta Mineralogica Sinica
- 出版年：2011
- 卷期：31(1)
- 关键词：碱性岩 ; alkali rocks ; 二长岩 ; monzonites ; 铀—铅计时 ; U-Pb dating ; 山西 ; Shanxi Province
- 页码：p.70-79
- 图表：4 illus., 2 tables, 26 refs.
- 分类号：0801
- 出版序号：20120167
- issnNo：ISSN1000-4734
- isbnNo：CN52-1045/P
摘要
The Zijinshan alkaline intrusive complex,located in the eastern margin of the Ordos Basin, mainly consists of salite monzonite, diopside syenite, and nepheline-diopside syenite.This paper presented the zircon LA-ICP-MS data of U-Pb in salite monzonite and salite syenite from the Zijinshan alkaline complex. Zircon rims from salite monzonite sample are magmatic genesis with oscillatory and sector zoning,and have Th/U ratios of 0.781 to 2.559, with 206Pb/238U age of (136.7±6.5) Ma. In addition,the other two zircon grains from monzonite yield 206Pb/238U apparent ages of (222±4) Ma and (323±3) Ma, respectively, probably representing the timing of the magma underplating.
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