Premières données géochronologiques sur le volcanisme alcalin du Jbel Saghro, Anti-Atlas, Maroc

Journal of African Earth Sciences (and the Middle East) Pub Date : 1993-10-01 DOI:10.1016/0899-5362(93)90077-4

M. Berrahma , M. Delaloye , A. Faure-Muret , H.E.N. Rachdi

{"title":"Premières données géochronologiques sur le volcanisme alcalin du Jbel Saghro, Anti-Atlas, Maroc","authors":"M. Berrahma , M. Delaloye , A. Faure-Muret , H.E.N. Rachdi","doi":"10.1016/0899-5362(93)90077-4","DOIUrl":null,"url":null,"abstract":"<div><p>The Jbel Saghro is one of the two late Cenozoic, large volume strato-volcano of the so-called Anti-Atlas. Saghro (east) and Siroua (west) lie within a zone of local extension but in a regional context of compression, related to a major E-W fault system that defines the southern rim of the Haut-Atlas. The tectonic regime is trans-tensional.</p><p>Lavas composition range from olivine nephelinites to phonolithes, but major and trace element criteria permit distinctions between one group which includes only phonolites versus a separate more diverse group which includes nephelinites and phonolites. K-Ar dating of 22 whole rock samples demonstrate a temporal-spatial progression from early volcanism in the centre of the area (10-6.4 Ma) to activity focused in the northern part of the complex (5.5-2.8 Ma; includes the youngest eruption). The sequence is successively more evolved from nephelinite through tephrite to phonolite, but the younger, northern sequence is confined to olivine-nephelinites.</p></div>","PeriodicalId":100750,"journal":{"name":"Journal of African Earth Sciences (and the Middle East)","volume":"17 3","pages":"Pages 333-341"},"PeriodicalIF":0.0000,"publicationDate":"1993-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0899-5362(93)90077-4","citationCount":"36","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of African Earth Sciences (and the Middle East)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0899536293900774","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 36

Abstract

The Jbel Saghro is one of the two late Cenozoic, large volume strato-volcano of the so-called Anti-Atlas. Saghro (east) and Siroua (west) lie within a zone of local extension but in a regional context of compression, related to a major E-W fault system that defines the southern rim of the Haut-Atlas. The tectonic regime is trans-tensional.

Lavas composition range from olivine nephelinites to phonolithes, but major and trace element criteria permit distinctions between one group which includes only phonolites versus a separate more diverse group which includes nephelinites and phonolites. K-Ar dating of 22 whole rock samples demonstrate a temporal-spatial progression from early volcanism in the centre of the area (10-6.4 Ma) to activity focused in the northern part of the complex (5.5-2.8 Ma; includes the youngest eruption). The sequence is successively more evolved from nephelinite through tephrite to phonolite, but the younger, northern sequence is confined to olivine-nephelinites.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

摩洛哥反阿特拉斯Jbel Saghro碱性火山活动的首次地质年代学数据

Jbel Saghro火山是所谓的Anti-Atlas的两个晚新生代大体积层状火山之一。Saghro(东部)和Siroua(西部)位于局部伸展区，但处于区域压缩环境中，与一个主要的东西向断裂系统有关，该系统定义了上阿特拉斯的南缘。构造体制为反张性。熔岩的组成范围从橄榄云母岩到phonolite，但主要元素和微量元素的标准允许区分一组只包括phonolite与一个单独的更多样化的组，包括nepolite和phonolite。22个整块岩石样品的K-Ar测年显示了一个从该地区中心的早期火山活动(10-6.4 Ma)到集中在该杂岩北部的活动(5.5-2.8 Ma)的时空递进;包括最年轻的喷发)。该层序的演化顺序较好，从云母岩到软玉岩再到云母岩，但较年轻的北部层序仅限于橄榄石-云母岩。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Journal of African Earth Sciences (and the Middle East)

自引率

0.00%

发文量