武家沟地区成矿特征（Metallogenic characteristics of Majiagou area）.docVIP

武家沟地区成矿特征（Metallogenic characteristics of Majiagou area） [amphibolite] called amphibolite. It is mainly composed of hornblende and plagioclase Composed of metamorphic rocks. The content of ordinary amphibole and plagioclase in rocks is similar, or the former is slightly more than that of the latter A small amount of quartz, biotite, iron aluminum garnet, epidote, diopside, or pyroxene. The structure can be a piece of linen or ribbon Shape or lump. A product of intermediate metamorphism of igneous rocks or tuff or mafic marl. [gabbro] one of the basic intrusive rocks. The main mineral composition is clinopyroxene (augite), Diopside and other basic plagioclase and the two are nearly equal in content. Minor minerals are amphibole, olivine, biotite Other minerals are apatite, magnetite, ilmenite and so on. Color gray black. Medium to coarse grain. Hypautomorphic granular structure (or gabbro structure). According to the minor minerals, the gabbro can be divided into olivine gabbro and hornblende gabbro. Hui The long Su Changyan is a transition between the gabbro and Su Changyan rocks, which contain both clinopyroxene and orthopyroxene Type. If there is a small amount of feldspar, which is called gabbro, it is a kind of transition to alkaline gabbro. Gabbro gabbro Shi Ke altered fibrous tremolite, actinolite. The mafic can be altered albite, epidote, zoisite ore Aggregates and carbonates, grapes, kaolin, etc. Gabbro tends to be smaller intrusions and tend to have relatively large intrusions Good differentiation can be related to the transition of ultrabasic rocks and amphibolite facies; sometimes complicated with ultrabasic rocks, consisting of a variety of rocks Basic rock, ultrabasic rock, differentiation, layered production. The ore bed often accumulates at the bottom of the differentiation series; the better the differentiation, the ore bearing The greater the sex. Minerals associated with gabbro are iron, titanium, copper, nickel, phosphorus, and so on. [marble] is