摘要
海南二甲金矿是一个受韧性剪切带控制的多因复成矿床（Ｐｏｌｙｇｅｎｅｔｉｃ ｃｏｍｐｏｕｎｄ ｄｅｐｏｓｉｔ）它经历了长期复杂的地质演化过程，其中包括矿源层的形成、变质混合岩化热液的初步富集、韧性剪切作用的改造和再富集以及岩浆热液加大气热液的叠加。这些成矿作用的时序（Ｔｉｍｅ ｓｅｒｉｅｓ）与该区地质构造演化密切相关。根据现有的地质和年龄资料，可以确定它们分别发生在武陵期（１８００～１４００Ｍａ）、晋宁期（１４００～１０００Ｍａ）、加里东─海西期（５００～２５０Ｍａ）和印支－燕山期（２５０Ｍａ以后）。据此提出了本矿床的成矿模式。
The Erjia gold ore field in western Hainan island,southern China is composed of three types of the gold deposis: the altered mylonite type, the altered cataclasite type and polymetal quartz vein type. They were hosted by the migmatized metamorphic rocks of the Mid-Proterozoic Baoban Group, and controlled by northeast-trending Gezhen ductile shear zone and lateral ductile-brittle and brittle faults.Mineralization of the ore field had experienced long term and complex geological evolutionary processes. These processes consist of the formation of the source bed, the preliminary enrichment of the metamorphic-migmatized hydrothermal solution, the reworking and re-enrichment of the ductile shearing, and the superimposing of the magmatic hydrothermal solution with a small amount of meteroic waters. The time series of these ore-formig events closely related to geological structural evolution in the region.Based on available geological and isotopic dating data. the time series of these ore-forming events can roughly be defined to have occurred in the wuling epoch (1800-1400 Ma), Jinning epoch (1400-1000 Ma), Caledonian-Hercynian epoch (500-250 Ma), and Indo-China and Yenshan epoches (after 250Ma), respectively.In view of the above, we have established a synthetical metallogenic model for the polygenetic compound gold deposits of the Erjia gold ore field.
出处
《地质找矿论丛》
CAS
CSCD
1994年第3期17-27,共11页
Contributions to Geology and Mineral Resources Research
