A Gondwana pre-break up related magmatism in Bafoussam area, west Cameroon: source characteristics and 40Ar/39Ar geochronology

International Journal of Advanced Geosciences Pub Date : 2019-05-05 DOI:10.14419/IJAG.V7I1.21354

G. D. K. Nono, P. Wotchoko, Evine Laure Tanko Njiosseu, Sylvestre Ganno, Joelle Flore Tene Djoukam, Yannick Seplong, D. Nkouathio

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引用次数: 2

Abstract

The Gondwana pre-break up related formations in Bafoussam area are transitional calc-alkaline doleritic dykes exhibiting high Alumina and low Ti-Mg contents. Their REE compositions are similar to those of E-MORB (Nd/Nb≈1, Zr/Nb≤20). A high partial melting of about 20% of Garnet peridotites source having primitive mantle composition, is inferred to the studied rocks. They are slightly evolved 50

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喀麦隆西部Bafoussam地区Gondwana前裂解相关岩浆活动:震源特征及40Ar/39Ar年代学

巴富萨姆地区冈瓦纳破碎前相关地层为过渡性钙碱性白云岩岩脉，具有高铝、低钛镁的特征。稀土元素组成与E-MORB相似(Nd/Nb≈1,Zr/Nb≤20)。从所研究的岩石中推断出具有原始地幔成分的石榴石橄榄岩源约20%的高部分熔融。微演化50< mg# <54，斜辉石质为高温辉石(600℃~ 1100℃)。研究的岩脉位于板块内构造环境，形成40Ar-39Ar的高原年龄为229±7Ma。这些年龄与奥巴-奥布杜地块(尼日利亚)的白云岩年龄、喀麦隆火山线的玄武岩岩脉以及卡鲁-费拉基性岩浆活动的年龄略有不同，都被解释为冈瓦纳分裂之前的岩浆活动。Bafoussam地区白云岩的侵位年龄为229±7Ma，与中非冈瓦纳裂解前岩浆活动的早期阶段有关。

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International Journal of Advanced Geosciences

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