| 周永璋.大麻坪二道沟二辉橄榄岩岩体成因研究[J].地质找矿论丛,1986,(1):40-49 |
| 大麻坪二道沟二辉橄榄岩岩体成因研究 |
| PETROGENESIS OF DAMAPIN- ERDAUGOU LHERZOLITE, WANGQUAN, HEBEI |
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| DOI：10.6053/j.issn.1001-1412.1986.1. 004 |
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| 中文摘要: |
| 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. |
| 英文摘要: |
| Field geological observation, petrographic investigation, chemical analysis and thermodynamic calculation on Damapin-Erdaugou spinel-lhexzolite and the coexisting dike-like basalt suggest that this spinel-lhexzolite is a diapir of fragments of the upper mantle emplaced near the surface along a deep fracture zone, rather than an accumulation of ultramafic nodules carried by alkali basalt on the surface. |
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