岩石矿物学杂志2026，Vol.45Issue(3)：603-618,16.DOI:10.20086/j.cnki.yskw.2026.5091
滇东南薄竹山大山脚细晶岩年代学及其成因研究
Study on geochronology and genesis of Dashanjiao aplite in Bozhushan,southeastern Yunnan
摘要
Abstract
The Mesozoic magmatic activity in the Bozhushan area of southeastern Yunnan plays an important role in regional tectonic evolution and mineralization.A large number of aplite bodies are developed around the Bozhushan pluton in this area,yet previous studies on the timing and petrogenesis of such rocks remain limited.This paper focuses on the Dashanjiao aplite in Bozhushan and investigates its genesis and metallogenic implications through LA-ICP-MS zircon U-Pb dating,whole rock major and trace element analysis,and zircon Lu-Hf isotopic testing.Dating results indicate that it formed in the Late Cretaceous(89.1～87.5 Ma),consistent with the age of regional Yanshanian granites.Geochemical characteristics reveal that it is a highly fractionated S type granite,characterized by peraluminous to metaluminous composition,enrichment in silicon and alkali,and depletion in magnesium and iron.Zircon εHf(t)values range from-7.79 to-5.07,with tDM2 model ages of 1 451～1 300 Ma,suggesting that the magma was derived from partial melting of Mesoproterozoic crust.The pluton formed in a post collisional exten-sional setting under the background of Pacific Plate subduction.Its geochemical features(e.g.,depletion in Ba and Sr,high Rb/Sr ratio)reveal significant magmatic crystallization differentiation.Combined with previous research findings,it is concluded that the aplite and the granites in the region are products derived from the same source region but underwent different degrees of crystallization differentiation,the Late Cretaceous highly fractiona-ted S-type aplite originated from the low-temperature melting of Mesoproterozoic clay-rich crust,and the associated magmatic hydrothermal differentiation process played an important controlling role in regional W-Sn-Ag polymetallic mineralization.关键词
薄竹山大山脚地区/细晶岩/S型花岗岩/锆石U-Pb定年Key words
Bozhushan-Dashanjiao area/aplite/S-type granite/zircon U-Pb dating分类
天文与地球科学引用本文复制引用
罗聪,刘璇,刘学龙,张世涛,周杰虎,陆波德,陈显超,王涛,霍联双,邓亚峰..滇东南薄竹山大山脚细晶岩年代学及其成因研究[J].岩石矿物学杂志,2026,45(3):603-618,16.基金项目
深地国家科技重大专项(2024ZD1001702) （2024ZD1001702）
昆明理工大学"双一流"专项(202202AG050006-2) （202202AG050006-2）
云南省新一轮找矿行动暨地勘基金项目(Y202407) Deep Earth Exploration National Major Science and Technology Project(2024ZD1001702) （Y202407）
Double First-Class Science and Technology Special Project of Kunming University of Science and Technology(202202AG050006-2) （202202AG050006-2）
Yunnan Geological Exploration Foundation(Y202407) （Y202407）
