地质学报2025，Vol.99Issue(4)：1223-1237,中插21-中插24,19.DOI:10.19762/j.cnki.dizhixuebao.2023513
拉萨地体南缘中新世埃达克质斑岩中熔体包裹体特征
Characteristics of melt inclusions of Miocene adakitic porphyries in the southern margin of Lhasa terrane
摘要
Abstract
Miocene adakite porphyries are widely distributed along the southern margin of the Lhasa terrane,but they exhibit significant variations in ore-forming element composition and mineralization scale.In order to better understand the constraints of different mineralization of these Miocene porphyries,this study focuses on the ore-bearing porphyries of the Jiama Cu deposit and Bangpu Mo deposit.We carry out TIMA scanning and electron probe analyses of single melt inclusions in quartz phenocrysts from these porphyries.The results show that the melt inclusions in both Jiama and Bangpu are predominantly crystalline,composed mainly of quartz,albite,orthoclase,plagioclase,and mica.A significant negative correlation between SiO2 and K2O is observed in these melt inclusions from both deposits,classifying them as high-K calc-alkaline to shoshonite series.The Jiama ore-bearing porphyry has lower Cl(0～0.03％)and higher H2O(1.12％～4.35％)contents compared to the Bangpu porphyry.Previous research has shown that the injection of ultrapotassic magma and strong crystallization differentiation of potassium feldspar play an important role in the formation of porphyry deposits in collisional environments.In addition,the content of volatiles(including H2O and Cl)significantly influences the differences in metallogenesis.关键词
TIMA扫描/电子探针/熔体包裹体/斑岩矿床/拉萨地体Key words
TIMA scanning/electron probe/melt inclusions/porphyry deposits/Lhasa terrane引用本文复制引用
赵晓燕,杨竹森,董艳蕊,刘畅..拉萨地体南缘中新世埃达克质斑岩中熔体包裹体特征[J].地质学报,2025,99(4):1223-1237,中插21-中插24,19.基金项目
本文为中国地质调查项目(编号DD20230008)、国家自然科学基金项目(编号42072107)和第二次青藏高原综合科学考察研究项目(编号2021QZKK0302)联合资助的成果. （编号DD20230008）
