造山型金矿以多期H2O-NaCl-CO2流体叠加成矿为特征，成矿过程复杂，但金一般只在特定阶段成矿，因而获得各期次成矿流体的温度、压力、组分及矿物溶解-沉淀等信息，刻画成矿精细过程至关重要。传统研究方法过于宏观，往往遗漏多种关键矿化细节。流体热力学模拟和石英溶解度模型可正演成矿流体在不同压力-体积-温度-组分下的相变形为和热力学性质，分析石英的溶解-沉淀行为，模拟矿脉形成过程。石英和黄铁矿显微结构、原位微量元素和同位素，及原位流体包裹体分析可精细限定不同期次流体物理化学性质、来源及演化特征。本项目拟结合两种手段，应用于造山型金矿研究，有望在揭示成矿过程、矿化条件和金迁移-沉淀机制方面取得突破性进展。东昆仑成矿带的果洛龙洼金矿是典型的造山型金矿，是本项目的绝佳应用实例，分析造山带演化过程中成矿流体组分和物理化学条件对成矿元素迁移-沉淀的控制机理，对理解东昆仑成矿带金矿化机理具有重要意义。

Hydrothermal fluids in orogenic gold deposits are dominated by multiple and complex H2O-NaCl-CO2 fluids, but gold mineralization is only at some certain stages, making it significant to acquire temperature, pressure, composition and behavior of mineral dissolution-precipitation in each ore-forming stages. Traditionally, mineralization processes were classified by veins crosscutting relations and mineral assemblages, etc, and it always ignored some vital information. Thermodynamic modeling and quartz solubility model can be used to constrain the phase equilibria, fluid properties and quartz dissolution-precipitation behavior in the H2O-NaCl-CO2 system, and explore the process of quartz vein formation. In-situ analyses of microstructure, trace elements and isotopes on quartz and pyrite, as well as fluid inclusions in quartz, can precisely investigate physicochemical properties, sources and evolution of ore-forming fluids of different stages. This project will combine and apply the above two methods to orogenic gold deposits, expecting to make a breakthrough in revealing the fine process of mineralization, ore-forming conditions and the mechanism of gold migration-deposition. The representative Guoluolongwa gold deposit, which is a typical orogenic gold deposit, in the East Kunlun metallogenic belt is an excellent research target of this project. Analyzing the composition and physico-chemical conditions of ore-forming fluids during orogenic evolution, is of great significance to understand the formation, occurrence and mineralization mechanism of gold deposits in the East Kunlun metallogenic belt.