胶东蓬莱矿集区金矿床精细成矿过程

Penglai gold district, situated in the Penglai-Qixia Au belt of the central Jiaodong, exhibits several unique geologic features despite of a broad resemblance with other deposits. The proposed project will focus on investigating the hydrothermal-metallogenic processes of this ore district, and seek to understand the subtle and refined courses that are linked to the Au mineralization. Specific project aims involve: (1) delineating the fundamental controls on the genesis of visible gold using detailed fluid inclusion petrography and microthermometry; (2) unraveling the sources of ore-forming fluids and ore materials using electron probe microanalysis (EPMA), laser ablation ICPMS and Nano secondary ion mass spectrometer (NanoSIMS) on metal sulfide of different generations. Combing these macro- and micro- objectives, we attempt to reveal the geodynamic setting of the large-scale gold mineralizations.

蓬莱金矿集区隶属于胶东中部的蓬莱－栖霞成矿带，其矿床地质、成矿特征与胶东其它地区金矿有一定的相似性，但又显示出明显的地域特色，成矿期有大量明金产出。本项目以流体成矿作用为主线，对蓬莱矿集区金成矿精细过程进行重点研究，通过岩相学和流体包裹体研究，厘清蓬莱矿集区金矿床流体成矿系统发育、性质、演化及与对明金包形成的控制；利用电子探针、LA-ICP-MS和NanoSIMS等多种示踪手段，分析不同成矿期次载金硫化物微区元素和同位素地球化学特征，确定成矿流体与成矿物质来源和演化，精细刻画金成矿过程与控制因素，从而揭示蓬莱矿集区流体成矿系统发育的地球化学条件，探讨金矿形成的动力学背景。