安徽铜陵狮子山矿田岩浆岩矿物结构研究：对岩石成因和铜金成矿作用的制约

On the base of the previous studies for the magmatic rocks in the Tongling area, Anhui Province, we take the Baimangshan pyroxene diorite, Dongguashan and Shizishan quartz diorite as the research objects. We carry out system microscopic investigation and BSE image analysis for the dominated rock-forming minerals (hornblende, plagioclase, biotite, and pyroxene) and accessory minerals (apatite, metal sulfide, iron-titanium oxide) of these three intrusions. Major elements analysis for these minerals, and Sr, Ba, Fe trace elements and situ Sr isotope analysis for the plagioclase will also be done. Through the research of the mineral textures (include various disequilibrium textures and zonations) and their composition change, to investigate the forming mechanism of these mineral textures, to distinguish the magmatic processes (e.g. magma mixing crystallization differentiation and assimilation-contamination), and to reveal the redox state of the magma. We hope that this study could obtain profound and refined understanding about the petrogenesis of the magmatic rocks and related Cu-Au mineralization in the Tongling area.

在全面总结和吸收前人对铜陵地区燕山期岩浆岩研究的基础上，选取狮子山矿田内与Cu-Au成矿有关的白芒山辉石闪长岩和冬瓜山、狮子山石英闪长岩为研究对象, 对岩体的主要造岩矿物（角闪石、斜长石、黑云母、辉石）和副矿物（磷灰石、金属硫化物、铁钛氧化物）进行系统的镜下显微观察和背散射图像分析，开展各矿物的主量元素分析以及斜长石原位Sr、Ba、Fe微量元素和原位Sr同位素分析，掌握主要造岩矿物和副矿物的结构特征（包括各种不平衡结构、环带结构等）及其成分变化，分析矿物结构的形成机制，识别岩浆混合、结晶分异、同化混染等岩浆作用过程，揭示岩浆在演化过程中的氧逸度特征及变化，以期对铜陵地区岩浆岩成因及与其Cu-Au成矿作用的联系获得更为深入和精细的认识。