论文部分内容阅读
2700 Ma的阿比堤比绿岩带是由变质火山岩、同期火山岩和沉积岩以及伴生侵入体构成的,大体上呈S形的岩带。在整个岩带内的科马提岩里大约分散有十二个小镍矿床。它们的围岩是火山岩,与火山同期的超镁铁岩,含有40—45％的无水MgO,带有具鬣刺结构的顶部,并被较薄的橄榄岩和辉石岩流覆盖,至少有一个矿床(达蒙特矿床)是以纯橄榄岩侵入体为围岩的,而其他矿床是以含硫化物铁建造为围岩的(例如登多纳尔
The Abidibhi Greenstone Belt at 2700 Ma is a generally S-shaped rock belt composed of metamorphic volcanics, contemporaneous volcanic rocks and sedimentary rocks, and associated intrusions. Approximately twelve small nickel deposits are scattered throughout the kamamatite in the rock zone. Their surrounding rocks are volcanic rocks, contemporaneous with volcanoes, which contain 40-45% of anhydrous MgO with a top with a hypoid structure and are covered by thin peridotite and pyroxene rocks, at least One of the deposits (the Damont deposit) is surrounded by a dunite intrusive rock, while the others are constructed of sulphide-bearing iron (eg,