中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Petrogenesis and magmatic–hydrothermal evolution time limitation of Kelumute No. 112 pegmatite in Altay, Northwestern China: Evidence from zircon Usingle bondPb and Hf isotopes

文献类型:期刊论文

作者Zheng-Hang Lv;  Hui Zhang;  Yong Tang;  Shen-Jin Guan
刊名Lithos
出版日期2012
卷号154页码:374-391
关键词Magmatic–hydrothermal Evolutionzircon Usingle Bondpb Agehf Isotopepegmatitegranitealtay, Xinjiang
英文摘要

Granitic pegmatites and associated rare-metal deposits, unique features in the Altay orogen, are located in a key tectonic position of the southern Central Asian Orogenic Belt (CAOB) and document the tectonic evolution of the Paleo-Asian Ocean. The Kelumute No. 112 pegmatite, which intruded into the Jideke two-mica granites, hosts abundant rare-metal (e.g., Li, Be, Nb, Ta) ore deposits and ranks only second to the Koktokay No. 3 pegmatite in both size and reserves. To explore the evolution time limitation of magmatic, magmatic–hydrothermal and hydrothermal stages in the pegmatite magma system, the tectonic setting and the genetic relationship between pegmatites and granites, this study presents zircon Usingle bondPb and Hf isotopic compositions of the Kelumute No. 112 pegmatite and the wall rocks (two-mica granite and biotite granite) as determined by LA-ICPMS and LA-MC-ICPMS. The weighted mean 206Pb/238U ages of the internal textural zones of the pegmatite, including zones I, II, III, V and VI, are 238.3 ± 2.0 Ma, 233.5 ± 3.7 Ma, 188.3 ± 1.7 Ma, 218.8 ± 1.9 Ma and 210.7 ± 1.6 Ma, respectively. Wall rocks of two-mica granite and biotite granite are dated at 445.6 ± 4.3 Ma and 455.6 ± 5.4 Ma, respectively. Zircons from the Kelumute No. 112 pegmatite have lower positive εHf(t) values (+ 0.03 to + 2.35), with TDM model ages of 1112–1225 Ma. Wall rocks show similar zircon εHf(t) values (− 1.41 to + 4.13) and TDM model ages (1172 to 1515 Ma). However, three xenocrystic zircons from the granites are characterized by larger negative εHf(t) values (− 5.85 to − 9.83) and older TDM model ages (1839 to 2090 Ma). Thus, the following conclusions can be drawn: 1) the Kelumute No. 112 pegmatite and its wall rocks (Jideke two-mica granite and biotite granite) have no genetic relationship, as indicated by the large gaps between their formation ages. However, they did originate from a common source composed of ancient crust and mantle-derived materials under two different tectonic settings; 2) the magmatic, magmatic–hydrothermal transition and hydrothermal stages of the No. 112 pegmatite magma lasted for ~ 5 Ma, ~ 23 Ma and ~ 22 Ma, respectively; and 3) the No. 112 pegmatite magma was most likely formed in a post-collision tectonic setting, indicating that block amalgamation and collisional orogeny of the CAOB continued into the Triassic.

语种英语
源URL[http://ir.gyig.ac.cn/handle/42920512-1/10950]  
专题地球化学研究所_地球内部物质高温高压实验室
作者单位1.State Key Laboratory for Mineral Deposits Research and Department of Earth Sciences, Nanjing University, Nanjing 210093, China
2.Laboratory for High Temperature & High Pressure Study of the Earth's Interior , Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
3.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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GB/T 7714
Zheng-Hang Lv;Hui Zhang;Yong Tang;Shen-Jin Guan. Petrogenesis and magmatic–hydrothermal evolution time limitation of Kelumute No. 112 pegmatite in Altay, Northwestern China: Evidence from zircon Usingle bondPb and Hf isotopes[J]. Lithos,2012,154:374-391.
APA Zheng-Hang Lv;Hui Zhang;Yong Tang;Shen-Jin Guan.(2012).Petrogenesis and magmatic–hydrothermal evolution time limitation of Kelumute No. 112 pegmatite in Altay, Northwestern China: Evidence from zircon Usingle bondPb and Hf isotopes.Lithos,154,374-391.
MLA Zheng-Hang Lv;Hui Zhang;Yong Tang;Shen-Jin Guan."Petrogenesis and magmatic–hydrothermal evolution time limitation of Kelumute No. 112 pegmatite in Altay, Northwestern China: Evidence from zircon Usingle bondPb and Hf isotopes".Lithos 154(2012):374-391.

入库方式: OAI收割

来源:地球化学研究所

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