|Table of Contents|

Genetic Relationship Between Ore-bearing Pegmatite and the Surrounding Granite of Bieyesamasi Rare Metal Deposit in Altay of Xinjiang, China(PDF)

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

Issue:
2020年第01期
Page:
71-85
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Genetic Relationship Between Ore-bearing Pegmatite and the Surrounding Granite of Bieyesamasi Rare Metal Deposit in Altay of Xinjiang, China
Author(s):
DING Jian-gang1 YANG Cheng-dong2* YANG Fu-quan2 LI Qiang2
(1. No.701 Geological Team, Xinjiang Nonferrous Geoexploration Bureau, Changji 831100, Xinjiang, China; 2. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China)
Keywords:
rare metal deposit pegmatite granite zircon U-Pb age Hf isotope Altay orogenic belt Xinjiang
PACS:
P588.13+1; P597
DOI:
10.19814/j.jese.2019.07021
Abstract:
The newly discovered Bieyesamasi rare metal deposit, which is distributed in North Altay of Xinjiang and characterized by Li-dominated mineralization, is distinctive and representative. Li-Nb-Ta and Nb-Ta mineralized pegmatites are both developed in the mining area, and two-mica monzogranite is the direct surrounding rock of ore-bearing pegmatite veins. Based on the systematic field geological investigation(including detailed observations of field outcrops, drill holes, mineralization characteristics and alteration types, etc.), LA-ICP-MS zircon U-Pb dating and in-situ Hf isotope were carried out on ore-bearing pegmatite and two-mica monzogranite. The weighted mean 206Pb/238U ages are(151.0±1.8)Ma and(449.0±4.2)Ma, respectively. Ore-bearing pegmatite is formed in Late Jurassic, but two-mica monzogranite is formed in Late Ordovician. Ore-bearing pegmatite and two-mica monzogranite have εHf(t)values of 0.62-1.30 and 1.35-6.07, respectively, and have the two-stage mode ages of Hf isotope varying from 1 161 to 1 118 Ma and from 1 345 to 1 037 Ma, respectively. The εHf(t)values of ore-bearing pegmatite are much smaller than those of granite, and the gaps between the two-stage model age of Hf isotope and the formation age are much larger than those of granite, indicating that they are the products of Altay orogenic belt at different evolution stages. The large gaps in formation ages, different geotectonic backgrounds and different formation sources together show that there is no genetic relationship between ore-bearing pegmatite and two-mica monzogranite of Bieyesamasi rare metal deposit. The surrounding granite near the orebodies is not the true parent rock of ore-bearing pegmatite veins.

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Last Update: 2020-01-07