Zircon U-Pb SHRIMP Isotopic Dating of Granitic Garnet-Biotite Gneiss of the Aojiao Group at Aojiao Village of Dongshan County, Fujian Province, and Its Geological Significance
详细信息
- 责任者：Feng Yanfang (College of Earth Sciences and Mineral Resource ; China University of Geosciences ; Beijing 100083 ; China) ; Deng Jinfu
- 刊名：Geology in China
- 出版年：2011
- 卷期：38(1)
- 关键词：黑云母片麻岩 ; biotite gneiss ; 花岗质片麻岩 ; granitic gneiss ; 石榴子石岩 ; garnetite ; 铀—铅计时 ; U-Pb dating ; 福建 ; Fujian Province
- 页码：p.103-108
- 图表：6 illus., 3 tables, 10 refs.
- 分类号：0802
- 出版序号：20120172
- issnNo：ISSN1000-3657
- isbnNo：CN11-1167/P
摘要
In this paper, the authors conducted zircon U-Pb SHRIMP isotopic dating of the granitic garnet-biotite gneiss of the Aojiao Group at Aojiao Village of Dongshan County in Fujian Province. The Th/U ratios in the range of 0.31~1.01 (0.48 on average) show that the zircon is a typical magmatic mineral. The weighted mean 206Pb/238U age is (152.8±1.6) Ma (n=17, MSWD=1.12), which is considered to be the formation age of the gneiss. Some conclusions have been reached: 1) the granitic garnet-biotite gneiss of the Aojiao Group was formed in Late Jurassic rather than in pre-Devonian; and 2) the Qinyingshan Formation of the Aojiao Group should be divided into metamorphic intrusions and metamorphic sedimentary strata.
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