[1]陆凡,张勇,张雪辉,等.赣东北茶坑花岗斑岩锆石U-Pb年代学、地球化学特征及地质意义[J].华东地质,2023,44(01):39-50.[doi:10.16788/j.hddz.32-1865/P.2023.01.004]
　LU Fan,ZHANG Yong,ZHANG Xuehui,et al.Zircon U-Pb geochronology, geochemical characteristics and geological significance of the Chakeng granite porphyry, northeast Jiangxi Province[J].East China Geology,2023,44(01):39-50.[doi:10.16788/j.hddz.32-1865/P.2023.01.004]
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赣东北茶坑花岗斑岩锆石U-Pb年代学、地球化学特征及地质意义()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
44
期数:
2023年01期
页码:
39-50
栏目:
重要矿产资源专辑
出版日期:
2023-04-15

文章信息/Info

Title:
Zircon U-Pb geochronology, geochemical characteristics and geological significance of the Chakeng granite porphyry, northeast Jiangxi Province
作者:
陆凡1; 2;  张勇2;  张雪辉2;  莫子奋1;  吕劲松2;  武彬2
1. 江西省地质局第六地质大队, 江西鹰潭 335001;
2. 中国地质调查局南京地质调查中心, 江苏南京 210016
Author(s):
LU Fan1; 2;  ZHANG Yong2;  ZHANG Xuehui2;  MO Zifen1;  Lü Jinsong2;  WU Bin2
1. The Sixth Geological Brigade of Jiangxi Geological Bureau, Yingtan 335001, Jiangxi, China;
2. Nanjing Center, China Geological Survey, Nanjing 210016, Jiangsu, China
关键词:
赣东北茶坑; 花岗斑岩; 锆石U-Pb年龄; 岩石地球化学; 白钨矿化
Keywords:
Chakeng; northeast Jiangxi; granite porphyry; zircon U-Pb dating; petrogeochemistry; scheelite mineralization
分类号:
P611P618.67
DOI:
10.16788/j.hddz.32-1865/P.2023.01.004
摘要:
赣东北茶坑花岗斑岩及围岩中发现了白钨矿化。为了进一步查明钨矿化与花岗斑岩的关系及其成矿潜力,对花岗斑岩开展了锆石U-Pb年代学、岩相学及地球化学研究。结果表明:茶坑花岗斑岩的形成年龄为153~152 Ma;具有高硅(SiO2含量为74.62％~76.09％)、富碱(Na2O+K2O含量为7.14％~8.55％)、富钾(K2O含量为4.95％~5.69％)、强过铝质(A/CNK为1.17~1.39,平均值为1.3)的特征;微量元素相对富集Rb、U、K,亏损Ba、Sr、P、Ti;稀土元素总含量为(62.52~75.13)×10-6, (La/Yb)N=3.73~12.16,平均值为7.81,轻、重稀土元素分馏明显,且相对富集轻稀土,具有中等程度的Eu负异常(δEu为0.55~0.82)。茶坑地区花岗斑岩的W含量为(8.80~160)×10-6,平均值为51.16×10-6,是华南花岗岩W平均含量的15倍,表明该地区花岗斑岩具有形成斑岩型-石英脉型钨矿的潜力。
Abstract:
The scheelite mineralization was found in the Chakeng granite porphyry and its surrounding rocks in northeastern Jiangxi Province. In order to ascertain the relationship between the tungsten mineralization and granite porphyry and pursue its metallogenic potential, the zircon U-Pb isotopic dating, geochemical and petrographic studies of granite porphyry were carried out. The results show that the Chakeng granite porphyry is 152~153 Ma in age, characterized with high silicon (content of SiO2 is 74.62％~76.09％), rich alkali (content of Na2O+K2O is 7.14％~8.55％) and kalium (content of K2O is 4.95％~5.69％), as well as strongly peraluminous (A/CNK=1.17~1.39, averagely 1.3); the trace elements are relatively enriched in Rb, U, K, and deficient in Ba, Sr, P, Ti; The total content of rare earths is (62.52~75.13)×10-6, and (La/Yb)N=3.73~12.16, with an average value of 7.81.The fractional distillation of light and heavy rare earth elements is obvious, and the light rare earth elements are relatively enriched, with moderate negative Eu anomaly (δEu is 0.55~ 0.82). The W content in the Chakeng granite porphyries is (8.80~160)×10-6, with an average value of 51.16×10-6, 15 times of the average tungsten content of the granites in South China, indicating that the granite porphyries in the Chakeng area have metallogenic potential of porphyry-quartz vein-type tungsten deposit.

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备注/Memo

备注/Memo:
收稿日期:2022-10-7;改回日期:2023-1-30。
基金项目:国家重点研发项目"武夷德化—尤溪—永泰矿集区三维综合探测与深部成矿预测(编号:2016YFC0600210)"、中国地质调查局"钦杭成矿带武宁—平江地区钨铜多金属矿地质调查(编号:DD20190153)"项目联合资助。
作者简介:陆凡,1993年生,男,助理工程师,本科,主要从事地质矿产勘查工作。Email:422904208@qq.com。
通讯作者:张勇,1983年生,男,高级工程师,本科,主要从事地质矿产勘查及科研工作。Email:252820423@qq.com。
更新日期/Last Update: 1900-01-01