摘要
各种数据资料证明沙溪斑岩铜(金)矿床成矿物质主要来自岩浆热液。矿化斑岩体的特征应包括与矿化有一定内在联系的岩体的各种特点,特别是岩浆期后热液活动的特点。根据岩体的形态、产状和形成方式,岩浆体系的物理化学性质,以及岩浆期后热液活动的特征,推断矿化斑岩体形成的充分且必要条件是:岩浆一热液体系极端远离平衡态;岩浆-热液体系的物理化学性质使其能够提供足够的成矿物质;岩浆热液体系具有半封闭性,一方面不断与环境(岩浆源、围岩、地下水)进行物质与能量交换,另一方面成矿物质又要相对集中不被逸散。
Various data demonstrate that ore-forming material of the Shaxi porphyry copper (gold) deposits came mainly from magmatic hydrothermal solution. characteristics of the mineralized porphyry ought to include all the features related to mineralization of the stock, especially features of postmagmatic hydrothermal activities. Based upon the shape, mode of occurrence and emplacement form of the stock, physicochemical behaviors of the magmatic system, and properties of postmagmatic hydrothemal activities, the authors have deduced the prerequisite for the formation of the mineralized porphyry: the condition of the magmatic-hydrothermal system is extremely distant from the equilibrium state, sufficient ore-forming materials are supplied due to the favorable physicochemical properties of the magmatic-hydrothermal system; the hydrothermal system related to porphyry is half-closed, that is, on the one hand, it constantly exchanges materials and energy with surrounding media such as magma, wall r(?)cks and ground water, and, on the other hand, the ore -forming materials should be relatively concentrated without dispersion.
出处
《矿床地质》
CAS
CSCD
北大核心
1991年第3期232-242,共11页
Mineral Deposits
基金
国家自然科学基金
