中国松潘-甘孜造山带柯儿岭花岗伟晶岩及伴生锂矿化的成岩作用:磷灰石和块岩化学证据

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Qing-Gao Yan, Jian-Kang Li, Deng-Hong Wang, Ze-Ying Zhu, Chao Li, Zhen-Yu Chen
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引用次数: 0

摘要

锂-铯-钽(LCT)型花岗伟晶岩通常出现在花岗岩体附近。对于许多伟晶岩岩场来说,伟晶岩熔体究竟是源于演化的花岗岩岩浆,还是源于变质岩的低度局部熔融,并不明显。中国松潘-甘孜造山带的柯儿殷花岗岩伟晶岩围绕大体积花岗岩侵入体(包括生物花岗岩(BG)、双云母花岗岩(TG)和蕈状花岗岩(MG))蕴藏着大量的氧化锂储量,是研究花岗岩伟晶岩成岩过程及相关锂矿化的绝佳地点。我们的研究结果表明,这些花岗岩产生于一个共同的岩浆源,并以脉冲和分块结晶的方式喷出。这些花岗岩和相关伟晶岩的块岩Zr/Hf和Nb/Ta比值以及磷灰石Y/Ho和Sr/Y比值呈现出不和谐的趋势,反映了从花岗岩岩浆到富通量伟晶岩熔体的演化过程。伟晶岩熔体可能是在从 BG 岩浆向 TG 和 MG 岩浆演化的过程中从 TG 岩浆中衍生出来的。BG磷灰石的初始87Sr/86Sr比值(0.7161-0.7188)和大块岩石的低Fe2O3/FeO比值(0.04-0.22)意味着深部的西康组可能经历了高程度的局部熔融,以产生原始的花岗岩岩浆。这种玄武岩的熔融产生了低通量和稀有金属含量的大容积岩浆,随后在多次岩浆喷发过程中发生了持久的分馏。这一过程的结果是从花岗岩岩浆中形成了富含通量和稀有金属的伟晶岩熔体。这种机制可能适用于世界各地与大型花岗岩复合体有关的许多 LCT 型伟晶岩。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Petrogenesis of Ke’eryin granitic pegmatites and associated Li mineralization in the Songpan–Ganze orogenic belt, China: evidence from apatite and bulk-rock chemistry

Petrogenesis of Ke’eryin granitic pegmatites and associated Li mineralization in the Songpan–Ganze orogenic belt, China: evidence from apatite and bulk-rock chemistry

Li–Cs–Ta (LCT)-type granitic pegmatites commonly occur adjacent to granitic bodies. For many pegmatite fields, it is not obvious whether the pegmatitic melt originated from an evolved granitic magma or from low-degree partial melting of metasedimentary rocks. The Ke’eryin granitic pegmatites in the Songpan–Ganze orogenic belt, China, which hosts large Li2O reserves around large-volume granitic intrusions, including biotite granite (BG), two-mica granite (TG), and muscovite granite (MG), present an excellent location to investigate the petrogenesis of granitic pegmatites and associated Li mineralization. Our results suggest that these granites were generated from a common magma source and emplaced in pulses, coupled with fractional crystallization. These granites and associated pegmatites show discordant trends in the bulk-rock Zr/Hf and Nb/Ta ratios and apatite Y/Ho and Sr/Y ratios, which reflect an evolution from granitic magma to flux-rich pegmatite melts. Pegmatitic melts might have derived from TG magma during evolution from BG to TG and MG magma. Initial 87Sr/86Sr ratios of BG apatite (0.7161–0.7188) and low bulk-rock Fe2O3/FeO ratios (0.04–0.22) imply that the Xikang Group at depth might have undergone high-degree partial melting to produce the original granitic magma. This melting of metasedimentary rocks, resulting in a large-volume magma with low flux and rare-metal contents, was followed by protracted fractionation during multiple pulses of magma emplacement. This process resulted in the formation of flux- and rare metal-rich pegmatite melts from granitic magma. This mechanism may be applicable to many LCT-type pegmatites associated with large granitic complexes worldwide.

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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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