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大麻坪超镁铁岩主要以两种产状产出,一是以包体形式寄生在碧玄岩、碱性橄榄玄武岩中,二是地幔底辟体侵位至近地表形成二辉橄榄岩岩体.二道沟二辉橄榄岩体相对规模大,露头较好,岩石新鲜,其中橄榄石颗粒粗大,色泽鲜艳,现被当作宝石矿加以开采利用.同时也吸引了不少专家、学者在此作了大量研究工作.关于它的成因问题,多数学者认为它是包体堆积成因.通过近两年野外和室内工作,笔者认为二道沟二辉橄榄岩岩体并非包体堆积,而是二辉橄榄岩固态侵入体.
The Mamaping ultramafic rocks are mainly produced in two forms: one is parasitic in the basalt and the other basic olivine basalts in the form of inclusions; the other is the emplacement of the mantle diapirism to the near surface to form lherzolite rock mass The Erdaogou Limestone Peridotite is relatively large in scale and outcrops are good with fresh rocks, of which the peridot grains are coarse and bright in color, and are now being exploited as gemstones, attracting many experts and scholars here Made a lot of research work.On its cause of formation, most scholars believe that it is the cause of the accumulation of inclusions.By the past two years field and indoor work, I believe that the two ErdaogouLabelite rock body is not a pack accumulation, but two Peridotite solid intrusions.