Petrology of the alkaline rocks of the Macau Volcanic Field, NE Brazil

详细信息    查看全文

• 作者：Emmanuel Donald Ngonge^a ; ^{donald@usp.br} ; Maria Helena Bezerra Maia de Hollanda^a ; Má ; rcio Martins Pimentel^b ; Dió ; genes Custó ; dio de Oliveira^c
• 关键词：Continental alkali basalts ; FOZO mantle component ; Enriched mantle.
• 刊名：Lithos
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：266-267
• 期：Complete
• 页码：453-470
• 全文大小：2157 K
• 卷排序：266

文摘

Cenozoic MVF nephelinite-basanite-alkali olivine basalts presented in 4 groups. Compositions of primitive characteristics: 10%<Mgo < 15% and 200ppm < Ni < 500ppm. Are sodic, fractional crystallization limited, exhibit LILE and Nb-Ta enrichment. Magmas from amphibole ± phlogopite and amphibole-rich garnet and spinel lherzolites. Geochemical modelling shows mixing of FOZO and EM components.