LA-ICPMS Zircon U-Pb Geochronology and Hf Isotopic Composition of the Taoxi Migmatite (Wuping): Constrains on the Formation Age of the Taoxi Complex and the Yu’nanian Event
详细信息
- 责任者：Zhang Aimei (Key Laboratory of Isotope Geochronology and Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhou 510640 ; China) ; Wang Yuejun
- 刊名：Geotectonica et Metallogenia
- 出版年：2011
- 卷期：35(1)
- 关键词：花岗质片麻岩 ; granitic gneiss ; 铀—铅计时 ; U-Pb dating ; 铪同位素 ; hafnium isotopes ; 部分熔融 ; partial melting ; 混合岩 ; migmatites ; 元古宙 ; Proterozoic ; 混合作用 ; hybridization
- 页码：p.64-72
- 图表：5 illus., 2 tables, 31 refs.
- 分类号：0802
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
This paper presents LA-ICPMS zircon U-Pb geochronology and Hf isotopic composition for two migmatitic and gneissic samples from the Taoxi Complex at the Aocun-Tianyuan areas (Wuping). Zircons from the two samples (FJ-137 and FJ-138) yield the weighted mean 206Pb/238U ages of (496±4)Ma (n=8) and (494±6)Ma (n=17), respectively. Some grains give Neoproterozoic ages (641～657 Ma and 799 Ma), which can be considered to be inherited grains. The Hf isotopic compositions for FJ-137 sample range from -2.3 to -18.2 with the Hf model age of 1.84～2.65 Ga. The results show that: 1) the Mesoproterozoic Taoxi “Group” is most likely to be the Complex; 2) these rocks probably represent the products of the reworked Neoproterozoic-Early Paleozoic sedimentary sequences; and 3) the 494～496 Ma magmatism in the Wuping area might be correlated with the Yu’nanian orogenic event that were previously discussed in other studies.
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