粤北黄沙桥铀矿床花岗岩锆石U-Pb年龄、Hf同位素特征及岩石地球化学和地质意义

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中文摘要：黄沙桥铀矿床位于诸广山岩体南部,处于城口矿集区西侧.本文针对黄沙桥铀矿床赋矿花岗岩开展了 LA-ICP-MS锆石U-Pb定年、Hf同位素及地球化学组成测定,结果显示:中粗粒斑状黑云母花岗岩和中细粒斑状黑云母花岗岩年龄分别为152.8±1.1 Ma和154.0±1.4 Ma.元素分析结果表明:两类黑云母花岗岩均具富硅、富碱、高K2O/Na2O值和低CaO/Na2O值等特征,二者皆具有较一致的稀土、微量分配曲线特征;均相对富集大离子亲石元素Rb以及高场强元素Th、U、Hf,明显亏损Ba、Nb、Ti等元素;两者均具明显轻重稀土分馏特征,稀土配分曲线呈"右倾型"以及明显的Eu负异常;两类黑云母花岗岩均具有较低εHf(t)值(-15.24～-8.96和-13.60～-9.65),二者古元古代的模式年龄为2171～1778 Ma和2063～1821 Ma.两类黑云母花岗岩均属于强过铝质S型花岗岩,主要由富黏土的泥质沉积岩部分熔融而来.二者均为燕山期岩浆活动的产物,是在太平洋板块俯冲导致的伸展构造背景下,由古元古代为主的地壳源区低程度部分熔融的方式形成.

外文标题：U-Pb ages and Hf isotopic characteristics of zircons from and petrogeochemistry of the granite in Huangshaqiao uranium deposit,northern Guangdong

外文摘要：The Huangshaqiao uranium deposit is located in the southern part of the Zhuguangshan composite pluton,on the west side of the Chengkou ore concentration area.In this paper,zircon LA-ICP-MS U-Pb dating,Hf isotope and geochemical composition measurements have been carried out for the granite of the Huangshaqiao uranium deposit.The results show that the ages of the medium—coarse grained porphyritic Biotite granite and the medium—fine grained porphyritic Biotite granite are 152.8±1.1 Ma and 154.1±1.4 Ma,respectively.The results of element analysis show that the two types of Biotite granites are rich in silicon,alkali,high K2O/Na2O ratio and low CaO/Na2O ratio,both of which have relatively consistent REE and trace distribution curves;They are relatively enriched in large ion lithophile elements Rb and high field strength elements Th,U,and Hf,with significant depletion of elements such as Ba,Nb,and Ti.Both have obvious light and heavy rare earth fractionation characteristics,with rare earth partitioning curves showing a right-dipping pattern and distinct negative Eu anomalies.Both types of Biotite granite have lower εHf(t)values(-15.24～-8.96 and-13.60～-9.65),and their Paleoproterozoic model ages(2171～1778 Ma and 2063～1821 Ma).Both types of Biotite granites belong to strongly aluminous S-type granites,which are mainly partially melted from clay rich argillaceous Sedimentary rock.Both are products of Yanshanian magmatic activity,formed by low degree partial melting of the crustal source area dominated by the Paleoproterozoic era under the extensional tectonic background caused by the subduction of the Pacific Plate.

外文关键词：

Huangshaqiao uranium depositzircon U-Pb datinggeochemistrygeochronologyHf isotopenortheastern Guangdong

作者：

周堂波、李俊、江卫兵、钟福军、李海东、郭新文、许幼

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作者单位：

核工业二九○研究所,广东韶关,512026

东华理工大学核资源与环境国家重点实验室,南昌,330013

关键词：

黄沙桥铀矿床锆石U-Pb定年 Hf同位素地球化学粤北

基金：

中国核工业地质局项目中国核工业地质局项目国家自然科学基金资助项目国家自然科学基金资助项目中国地质调查局花岗岩成岩成矿地质研究中心开放基金资助项目中国铀业有限公司—东华理工大学核资源与环境国家重点实验室联合创新基金资助项目中国铀业有限公司—东华理工大学核资源与环境国家重点实验室联合创新基金资助项目中国铀业有限公司—东华理工大学核资源与环境国家重点实验室联合创新基金资助项目

项目编号：

202238202138-24236201142002095PMGR202107NRE2021-01NRE2021-092022NRE-LH-05

出版年：

2024

DOI：

10.16509/j.georeview.2024.05.025

地质论评

中国地质学会

地质论评

CSTPCD北大核心

影响因子：1.842

ISSN：0371-5736

年,卷(期)：2024.70(5)

参考文献量34