Petrologic features of mesoproterozoic lamprophyric dykes from Montevideo (Piedra Alta terrane, South Uruguay)

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Earth Sciences Research Journal Pub Date : 2021-07-19 DOI:10.15446/ESRJ.V25N2.89652

R. Muzio, N. Martino, E. Peel

引用次数: 1

Abstract

Mafic dykes of lamprophyric affinity cropping out along the coastal area of Montevideo city are described. These dykes trend N75o-85o and crosscut 2.1 Ga Paleoproterozoic metamorphic units of the Rio de la Plata craton. They show mainly porphyritic textures with phlogopite and clinopyroxene macrocrysts in a groundmass composed of carbonates, phlogopite, augite, and feldspathoids. Ocellar structures filled by leucite, carbonates and fibrous alkaline amphibole are present. The mineralogical assembly allows their classification as lamprophyres (minettes), but according to their chemical nature, they can be classified as alkaline lamprophyres. A crystallization age of 1.42 Ga, by Ar-Ar method (on biotite/phlogopite) was obtained.

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乌拉圭南部蒙得维的亚(Piedra Alta地体)中元古代煌斑岩岩脉岩石学特征

描述了沿蒙得维的亚市沿海地区出现的煌斑岩亲和基性岩脉。这些岩脉走向n750 ~ 850°，横切拉普拉塔克拉通里约热内卢古元古界2.1 Ga变质单元。在由碳酸盐、绢云母、辉长岩和长石组成的地质体中，它们主要表现为含有绢云母和斜辉石大晶体的斑状结构。存在由白晶石、碳酸盐和纤维性碱性角闪孔填充的孔洞结构。矿物学组合可将其分类为煌斑岩，但根据其化学性质，可将其分类为碱性煌斑岩。用Ar-Ar法(在黑云母/绿云母上)测定结晶年龄为1.42 Ga。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Earth Sciences Research Journal 地学-地球科学综合

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

>12 weeks

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