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首页> 外文期刊>International Journal of Geosciences >Petrochemical Characterization of Two Distinct Types of Dolerites from Bafoussam Area, West Cameroon
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Petrochemical Characterization of Two Distinct Types of Dolerites from Bafoussam Area, West Cameroon

机译：喀麦隆西巴夫桑姆地区两种不同类型白云岩的石化特征

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Two petrochemical types of doleritic dykes have been distinguished in Bafoussam area: 1) the olivine-bearing dolerites which are the most representative are dark green, showing characteristics of alkaline basalts and, 2) the calcite-bearing dolerites are grayish green, showing characteristics of tholeiitic basalts. The studied dolerites are less differentiated (1 FeOt/MgO 2); they present the evolution of a subalkaline magma following a calc-alkaline series (alkaline dolerites) and the tholeiitic series (tholeitiic dolerite). The chondrite normalized multielement spider diagrams of all the dolerites show a pronounced depletion in Ba, Th, and enrichment in Rb. Their geotectonic context is inferred to be intraplate and the contrast between the two types is probably due to a diverse source: crustal source for calcite-bearing dolerites and mantle source for olivine-bearing dolerites.
机译：在Bafoussam地区，已区分出两种岩石化学类型的白云岩堤：1）最典型的橄榄石白云岩是深绿色，表现出碱性玄武岩的特征; 2）方解石白云岩是灰绿色，表现出玄武岩研究的钙铝石的分化程度较低（1 FeOt / MgO 2）。他们介绍了钙碱性系列（碱性白云石）和胆碱系列（纯胆性白云石）之后的碱下岩浆的演化。所有白云母的球粒陨石归一化多元素蜘蛛图显示，Ba，Th明显耗竭，Rb富集。据推测，它们的大地构造背景是板内的，两种类型之间的对比可能是由于来源不同：方解石来源为方解石的地壳来源和橄榄石来源的地幔的来源为地幔来源。

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