中条裂谷铜矿床成矿流体的物理化学条件

PHYSICOCHEMICAL CONDITION OF MINERALIZING FLUIDS IN COPPER ORE DEPOSIT,THE ZHONGTIAO RIFT ZONE

中条裂谷主要铜矿床的包裹体是以液相包裹体为主，含气液相包裹体亦较普遍，常含子矿物ＮａＣｌ；成矿温度以１４０—３００℃为主，晚期则高达４００—６２０℃；主要矿床的包裹体化学成分及化学序列相似，普遍富含Ｃｌ－，Ｎａ＋，Ｃａ２＋和Ｈ２Ｏ及ＣＯ２；成矿流体以高盐度（３２～４０Ｗｔ％ＮａＣｌ）为主，密度为１．０～１．１８ｇ／Ｃｍ３；各矿床成矿的物理条件不同，沉淀环境存在若干差异．矿床属海底中低温热液铜矿床．

The compositons of inclusions in copper ores from main deposits of the Zhongtiao rift zone consist mainly of the gaseous phase and generally of gas-liquid phase, as well as usually with inclusions of NaCl in daughter minerals. Ore-forming temperatures range mainly from 140℃ to 300℃ and increase from 400℃ to 620℃ during the later stage of ore-formation. The chemical compositions and the chemical successions of major ore deposits are similar. They are generally rich in Cl-, Na+, Ca2+, H2O and CO2. The mineralizing fluids are mainly of high salinity (32-40 Wt% NaCl). The mineralizing density is 1.0-1. 18 g / cm3.The ore-forming physical conditions of ore deposits are different. Their precipitation environments have some differences. Ore deposits are of the submarine low-mesothermal copper type.