地球学报2025，Vol.46Issue(4)：726-744,中插1-中插4,23.DOI:10.3975/cagsb.2024.102601
西藏多龙矿集区拿若斑岩型铜(金)矿床锆石和磷灰石地球化学特征及意义
Geochemical Characteristics and Significance of Zircon and Apatite in the Naruo Porphyry Cu(Au)Deposit in the Duolong Ore District,Tibet
摘要
Abstract
The large-scale Naruo porphyry copper(gold)deposit is one of the important deposits in the Duolong Ore District,Tibet.Although previous studies have examined the diagenetic and metallogenic ages,source of ore-forming materials,genetic mechanism,dynamic background,and preservation conditions of the deposit,the research on geochemical characteristics of the evolution process of ore-bearing magma is still limited.Therefore,in this study,the laser ablation-inductively coupled plasma-mass spectrometry method was used to analyze trace element compositions of zircon and apatite in the ore-bearing rocks of the Naruo deposit.This analysis aimed to study the characteristics of the magma crystallization differentiation process,oxygen fugacity,and water content to explore the evolution characteristics of ore-bearing magmas and their implications for mineralization.Zircons from the ore-bearing rocks of the Naruo deposit showed strong positive Ce and moderate negative Eu anomalies,whereas apatite displayed strong negative Eu anomalies.The characteristics of the zircon and apatite trace elements indicated that the magma was formed in a continental arc environment and belonged to type I granitic rock.The Th/U,Ce/Sm,and Yb/Gd characteristics of zircon showed that zircon is affected by the co-crystallization of apatite and titanite from high temperature to low temperature.The ore-bearing magma of the Naruo deposit exhibited a higher water content and oxygen fugacity and had undergone a higher degree of evolution than the ore-barren magmas.The high oxygen fugacity of ore-bearing magmas may have been caused by SO2 degassing in sulfur-rich magmas and the re-emplacement or mixing of magmas.Zircon Dy/Yb<0.2,10 000×(Eu/Eu*)/Y>7,and Ce4+/Ce3+>200 can effectively distinguish ore-bearing from ore-barren rocks in the ore district.The results of this study demonstrate that the trace element characteristics of zircon and apatite can effectively indicate the source area characteristics,crystallization history,and ore-forming potential of igneous rocks.关键词
含矿性判别/磷灰石/锆石/矿物地球化学/拿若/多龙矿集区Key words
mineralization assessment/apatite/zircon/mineral geochemistry/Naruo/Duolong Ore District分类
天文与地球科学引用本文复制引用
张荣坤,张琪,陈守关,付雪莲,杨欢欢,董玉杰,王勤,李社,李发桥,袁盛朝,翟建军,李宏伟..西藏多龙矿集区拿若斑岩型铜(金)矿床锆石和磷灰石地球化学特征及意义[J].地球学报,2025,46(4):726-744,中插1-中插4,23.基金项目
本文由国家重点研发计划项目(编号:2022YFC2905001)、国家自然科学基金项目(编号:42230813)、中国地质调查局项目(编号:DD20230362)、四川省自然科学基金项目(编号:2023NSFSC0798)和西藏自治区"十四五"时期科技重大专项(编号:XZ202401YD0006-02)联合资助. This study was supported by National Key Re-search and Development Program of China(No.2022YFC2905001),National Natural Science Foun-dation of China(No.42230813),China Geological Survey(No.DD20230362),Natural Science Founda-tion of Sichuan Province(No.2023NSFSC0798),and Major Science and Technology Project of Tibet Au-tonomous Region in the 14th Five-Year Plan Period(No.XZ202401YD0006-02). （编号:2022YFC2905001）
