矿床地质2026，Vol.45Issue(3)：611-634,24.DOI:10.16111/j.0258-7106.2026.03.008
广东揭阳赤寮花岗岩体成因及其对燕山晚期钨成矿的约束
Petrogenesis of Chiliao granite pluton in Jieyang,Guangdong,and constraints on Late Yanshanian tungsten mineralization
摘要
Abstract
The eastern coastal region of eastern Guangdong,located along the southeastern margin of South China,rep-resents one of the most important Yanshanian tungsten-polymetallic metallogenic provinces,where mineralization is mainly controlled by the NE-trending Lianhuashan fault system and is temporally concentrated in 135～145 Ma.The Chiliao granite pluton,situated in the central segment of this fault zone,is flanked by several tungsten depos-its to its north and south;however,its genetic relationship with regional tungsten mineralization remains poorly constrained.This study investigates the emplacement age,magmatic characteristics,and tungsten enrichment fea-tures of the Chiliao pluton based on petrographic observations,whole-rock major and trace element geochemistry,and zircon trace-element and U-Pb geochronology.The results indicate that the Chiliao pluton is mainly com-posed of coarse-grained and fine-grained biotite granites,characterized by high SiO2(w(SiO2)=72.87％～75.68％),high total alkalis(w(K2O+Na2O)=7.53％～8.43％),peraluminous compositions(A/CNK=1.04～1.11),and a high degree of magmatic differentiation(Zr/Hf=27～31;Nb/Ta=6～7).Whole-rock W contents range from 300× 10-6 to 869× 10-6,with an average of 677×10-6,representing an enrichment of approximately 450 times relative to the av-erage crustal abundance and indicating pronounced tungsten enrichment.Zircon U-Pb dating yields crystalliza-tion ages of 131～137 Ma for the biotite granites;together with previously reported ages of 144 Ma and 157 Ma,these data demonstrate that the Chiliao pluton is a composite granite formed by multi-stage magmatic activity.Whole-rock geochemistry and zircon trace-element characteristics suggest that the 131～137 Ma magmas were mainly derived from partial melting of crustal materials and experienced intense magmatic differentiation.In com-bination with the regional tectonic framework,the Chiliao pluton is interpreted to have formed in a transitional tectonic setting related to back-arc extension or the transition from compression to extension induced by rollback and retreat of the Paleo-Pacific slab.The 131～137 Ma magmatic episode indicates that,following the regional main tungsten mineralization period,tungsten-fertile magmatic activity with mineralization potential may still have developed,highlighting favorable exploration significance and providing a new example for understanding the multi-stage nature of Yanshanian tungsten-fertile granitic magmatism in the eastern Guangdong coastal region.关键词
花岗岩成因/富钨花岗岩/锆石U-Pb年龄/赤寮岩体/揭阳/广东Key words
granite genesis/W-rich granite/zircon U-Pb age/Chiliao pluton/Jieyang/Guangdong分类
天文与地球科学引用本文复制引用
黄辰旭,陈郑辉,王岩,马旭东,许箭琪,赵云彪,范建福,张佳欣,贾冬博..广东揭阳赤寮花岗岩体成因及其对燕山晚期钨成矿的约束[J].矿床地质,2026,45(3):611-634,24.基金项目
本文得到深地国家科技重大专项二级项目《南岭中东段(赣南-粤东)中重稀土立体勘查评价与定位技术》之三级项目《赣南-粤东中重稀土成矿预测与找矿实践》(编号:2025ZD1007902)、中国地质调查局中国矿产地质志(编号:DD20221695,DD20190379)和全国常态化成矿远景区划(编号:DD2026021102)联合资助 （赣南-粤东）
