A new model for the granite-pegmatite genetic relationships in the Kaluan-Azubai-Qiongkuer pegmatite-related ore fields, the Chinese Altay

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	A new model for the granite-pegmatite genetic relationships in the Kaluan-Azubai-Qiongkuer pegmatite-related ore fields, the Chinese Altay
	Yun-Long Liu; Xin Zhang; Hui Zhang; Zhan-Long Ma; Yong Tang; Zheng-Hang Lv; Jing-Yu Zhao
刊名	Journal of Asian Earth Sciences
	2016
卷号	124 期号:1 页码:139-155
英文摘要	Pegmatites commonly form in the waning stage of magma evolution by fractional crystallization of volatile-rich magmas and may be important host rocks of strategic metals (e.g., Li, Be, Cs, Ta, and Nb) and high-quality gem minerals. This study reports new zircon U-Pb dating results and Hf isotopic compositions of the KLA803 pegmatite, the AZB-01 pegmatite, the JMK-09 pegmatite (abbreviated as the K-A-J pegmatites) and the Halong granite from the Chinese Altay to determine the potential petrogenetic relationships between them. The geochronological data document that the K-A-J pegmatites were emplaced at 224.6 +/- 2.3 Ma, 191.6 +/- 2.0 Ma and 192.0 +/- 2.3 Ma, respectively, and they are characterized by negative to low positive epsilon Hf(t) values (from -1.0 to +63) and old model ages (T-DM) (with the T-DM1 from 874 to 597 Ma and T-DM2 from 1298 to 833 Ma). In contrast, the Halong granite has an emplacement age of 398.3 +/- 2.4 Ma and is characterized by higher positive epsilon Hf(t) values (from +9.9 to +15.2) and younger model ages (T-DM) (with the T-DM1 from 626 to 414 Ma and T-DM2 from 760 to 423 Ma). They all have intruded into the Kulumuti group stratum, which has negative initial epsilon Nd(t) values (from -4.3 to -0.2) and old T-DM model ages (between 1.22 and 1.56 Ga). Based on the calculated results of the mixing ratios (f) of the initial magmas and the prevailing Paleozoic tectonic framework of the Chinese Altay, we establish two petrogenetic models for the K-A-J pegmatites: Model 1 refers to that these pegmatites originated from a mixed magma that was composed of 72-91 wt.% depleted mantle components and 9-28 wt.% lower crust components; and Model 2 refers to that they were derived from the partial melting of 38-83 wt.% Halong granite and 17-62 wt.% sedimentary rocks from the Kulumuti group. We also suggest that the initial magma of the Halong granite was significantly contributed by juvenile materials with a slight involvement of crustal materials. In Model 1, because LCT-type pegmatites (classified as Li-Cs-Ta enriched pegmatites associated with S-type granite that was produced by the partial melting of preexisting sedimentary rocks) have close geochemical affinities with crustal materials, the excessively high weight percentages (72-91 wt.%) of the depleted mantle components in the initial magma of the K-A J pegmatites indicate that this model is unrealistic. Therefore, we consider that Model 2 is more reasonable at present for interpreting the petrogenesis of the K-A-J pegmatites, and it needs to be verified in other pegmatite fields of the Chinese Altay.
学科主题	地球深部物质与流体作用地球化学
语种	英语
公开日期	2017-09-14
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6218]
专题	地球化学研究所_地球内部物质高温高压实验室_地球内部物质高温高压实验室_期刊论文
推荐引用方式 GB/T 7714	Yun-Long Liu,Xin Zhang,Hui Zhang,et al. A new model for the granite-pegmatite genetic relationships in the Kaluan-Azubai-Qiongkuer pegmatite-related ore fields, the Chinese Altay[J]. Journal of Asian Earth Sciences,2016,124(1):139-155.
APA	Yun-Long Liu.,Xin Zhang.,Hui Zhang.,Zhan-Long Ma.,Yong Tang.,...&Jing-Yu Zhao.(2016).A new model for the granite-pegmatite genetic relationships in the Kaluan-Azubai-Qiongkuer pegmatite-related ore fields, the Chinese Altay.Journal of Asian Earth Sciences,124(1),139-155.
MLA	Yun-Long Liu,et al."A new model for the granite-pegmatite genetic relationships in the Kaluan-Azubai-Qiongkuer pegmatite-related ore fields, the Chinese Altay".Journal of Asian Earth Sciences 124.1(2016):139-155.