中国硫化镍矿床成矿规律的研究与展望

中国硫化镍矿床主要分布于古大陆地壳的边缘地带以及古陆壳之间的增生褶皱带,成矿时代以元古代、晚古生代为主,多形成于拉张的地质环境。含矿岩体类型以拉斑之武岩系列的侵入体为主,多为超镁铁岩或超镁铁、镁铁质杂岩体。成岩成矿的物理化学条件属还原的深成环境,硫多来源于地幔,少数矿床有壳源硫加入。深部熔离-贯入作用是主要成矿方式,岩体小、含矿率高,陡产状。可归纳为四种成矿模式。

Studies Of Metallogenic Regularity Of Nickel Sulfide Deposits In China And Their Prospects

Nickel sulfide deposits in China are mainly distributed along the margin of the old landmass and the accretionary fold belt Oil the outer flank of the old landmass. Most of these deposits occur in Proterozoic and late Paleozoic, being products of tensile mechanism of the continental crust. Ore-bearing intrusive bodies are chiefly of tholeiite series commonly in the form of mafic-ultramafic complexes. Petrochemically, they are characterized by low SiO₂ value and Mg/Fe as well as relatively high Fe, Na₂O+K₂O and S. The exposed intrusives are small in area. They are strongly basic bodies with high ore potential and mostly assume steeply-dipping dykes, stocks and lenses. The ore-forming process took place under the physicochelnical condition of high temperature, great depth and reduction, and sulfur came mainly from the mantle with crustal sulfur added to a few deposits. Deep liquation-injection seems to be the major form of mineralization. In conformity with styles of deep Equation and injection, nickel sulfide deposits of China might be assigned to four metallogenic models, namely Jinchuan type, Hongqiqi type, Kelatongke type and Tongdongzi type, whose ore-forming styles are simple injection, complex injection, pulsation injection and late injection respectively.