论文部分内容阅读
马脑壳金矿床位于中国重要的“川、甘、陕”成矿远景区的川西北地区,是川西北地区与构造蚀变带有关的微细浸染型金矿的典型代表。近年来深部勘查、外围找矿和矿山开采发现了许多与原有认识不一致的地质现象,特别是越往深部,构造控矿和热液流体活动的迹象明显增强。根据对矿床地质特征的进一步研究,分析了矿床控矿因素,总结了成矿规律,探讨了矿床成因,指出了进一步找矿的方向。认为马脑壳金矿床以构造控矿为主,构造破碎岩带是主要矿体赋存部位,构造变形程度控制着矿体的空间分布、产出形态和矿化富集程度。多组构造复合部位是重要的赋矿部位,虽然矿(化)体总体呈北西向展布,但北北东向构造、北西向以及南北向构造复合部位是寻找富大矿体的主要方向。矿床表现出的层控性特点,主要与不同物理化学性质岩层的岩石组合有关,能干性(渗透障)与非能干性(不渗透障)岩层的交互叠置和有序排列,导致所有金矿体都产于能干性和非能干性的转换部位,即砂岩、板岩的接触部位。马脑壳矿床的成矿与传统的卡林型金矿有较大的差异,构造—岩浆活动对成矿起了重要的控制作用,有深部流体参与成矿的迹象,属多因复式成矿特征的大型中低温热液金矿床。
The Magma Shell Gold Deposit is located in the northwestern Sichuan Province of the important “Sichuan, Gan and Shan” mineralization prospect areas in China and is a typical representative of finely disseminated gold deposits related to structural alteration zones in the northwestern Sichuan. In recent years, deep exploration, peripheral prospecting and mining have found many geological phenomena that are inconsistent with the original understanding. In particular, as the more deep geological conditions go deep, the signs of tectonic activities and hydrothermal fluid activities are obviously enhanced. Based on the further study on the geological characteristics of the deposit, the ore-controlling factors of the deposit are analyzed, the metallogenic regularity is summarized, the genesis of the deposit is discussed, and the direction of prospecting is pointed out. It is believed that the magma gold deposit is dominated by tectonically controlled orebodies. The structural crushed rock belt is the main part of the ore body. The degree of tectonic deformation controls the spatial distribution, the output pattern and the degree of mineralization enrichment. Multiple sets of tectonic assemblages are important ore-bearing parts. Although ore bodies are generally distributed in the NW direction, the NE-trending, NW-trending and north-south tectonic complexes are the main directions for finding ore-rich ore bodies. The stratigraphic control features of the deposit are mainly related to the rock assemblages of different physico-chemical stratigraphy. The overlapping and orderly arrangement of incipient (permeable barrier) and non-incapacitated (impermeable barrier) strata resulted in that all gold mines The body is produced in the dry and non-incandescent conversion sites, sandstone, slate contact parts. The mineralization of the horse’s brain deposit is quite different from that of the traditional Carlin-type gold deposit. The tectono-magmatic activity plays an important controlling role in the mineralization. There are some signs that the deep fluid is involved in the metallogenesis. Large-scale low-temperature hydrothermal gold deposit.