PALEOMAGNETIC EVIDENCE FOR THE EVOLUTION OF MESO-PROTEROZOIC TO NEO-PROTEROZOIC GLACIOGENIC ROCKS IN CENTRAL-EASTERN BRAZIL

被引：17

作者：

DAGRELLAFILHO, MS

PACCA, IG

TEIXEIRA, W

ONSTOTT, TC

RENNE, PR

机构：

[1] UNIV SAO PAULO,INST GEOCIENCIAS,BR-05541 SAO PAULO,BRAZIL

[2] PRINCETON UNIV,DEPT GEOL & GEOPHYS SCI,PRINCETON,NJ 08544

来源：

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY | 1990年 / 80卷 / 3-4期

基金：

美国国家科学基金会; 巴西圣保罗研究基金会;

关键词：

D O I：

10.1016/0031-0182(90)90136-U

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

Paleomagnetic studies on basic dikes in the eastern São Francisco Craton which have isotopic ages of 1.0-1.1 Ga, define an apparent polar wander path for South America over this time interval. The data indicate that the São Francisco Craton was at paleolatitudes between 40° and 65° at the time of emplacement of these dikes. Neo-Proterozoic sedimentary glaciogenic rocks, the Macaúbas Group, Bebedouro Formation, Ibiá Formation and Carandai Formation, crop out in central-eastern Brazil. An age of about 1.0 Ga has been proposed for these glacial deposits. Paleogeographical reconstructions of South America show a continental movement coherent with paleoenvironmental models proposed for the Macaúbas Group and suggest that the glacial period may have occurred between 1.01 and 1.08 Ga. © 1990.

引用

页码：255 / 265

页数：11

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