|Table of Contents|

Geochemical Characteristics of Garnet from Jing'erquan Granitic Pegmatite-type Lithium-beryllium Deposit in East Tianshan, China: Implications for Magmatic Processes and Rare-metal Mineralization(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2025年第01期
Page:
16-33
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Geochemical Characteristics of Garnet from Jing'erquan Granitic Pegmatite-type Lithium-beryllium Deposit in East Tianshan, China: Implications for Magmatic Processes and Rare-metal Mineralization
Author(s):
JUMAHONG Yilizhati1;  FENG Yong-gang1; 2*;  LEI Ru-xiong1;  WU Chang-zhi1; 2; 3;  TANG Guo-qing1
(1. School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Laboratory of Mineralization and Dynamics, Chang'an University, Xi'an 710054, Shaanxi, China; 3. Xinjiang Natural Resources and Ecological Environment Research Center, Urumqi 832104, Xinjiang, China)
Keywords:
rare-element pegmatite;  granite;  garnet;  trace element;  microanalysis;  magma evolution;  East Tianshan
PACS:
P618.71
DOI:
10.19814/j.jese.2024.08027
Abstract:
Garnet is one of common accessory minerals in granites and granitic pegmatites, and is capable of preserving crucial information regarding magma evolution and rare-metal mineralization. The Jing'erquan rare-metal deposit is the most representative granitic pegmatite-type lithium-berylium deposit in East Tianshan. The magmatic evolution processes and the metallogenic dynamic background for Li-Be-Nb-Ta enrichment are still unclear. EPMA and LA-ICP-MS in-situ microanalyses were conducted on garnets from the spoduemene-type pegmatite and its host muscovite granite from Jing'erquan rare-metal deposit. The results show that garnets in the muscovite granite and spoduemene-type pegmatite predominantly occur as spessartine-almandine solid solution, with the sum of the two endmember contents exceeding 95%, exhibiting Mn enrichment and Ca depletion; the garnet from the muscovite granite is enriched in HREE, depleted in LREE, and shows negative Eu anomaly, whereas the garnet from the spoduemene-type pegmatite is characterized by gradual depletion of HREE and significant negative Eu anomaly; the contents of Y, HREE, and Sc of the garnets exhibit a decreasing trend at the pegmatite stage. In general, the garnet in Jing'erquan spoduemene-type pegmatite is of typical magmatic origin. Trace elements including Li, Na, REE, and Y exhibit coupled substitution in the garnet, and the contents of REE and Y decrease with increasing magma differentiation. In addition, the garnets from the lithium pegmatite at Jing'erquan rare-metal deposit also show high Nb and Ta, which is capable of indicating Nb-Ta mineralization in granitic pegmatites.

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