Contrasting P-T-t loops from southern East Africa, Natal and East Antarctica

Saved in:
Authors:Grantham, G. H.; Thomas, R. J.; Mendonidis, P.
Main Author Affiliation:Grantham, G. H., Department of Geology, University of Pretoria, Hillcrest, Pretoria 0002, South Africa
Volume Title:Journal of African earth sciences
Source:Journal of African earth sciences. 19(3). United Kingdom. P.225-235. ISSN: 1464-343X
Publication Date:1994
Note:With French summary. Refs. p.233-235. Ant. Acc. No: 52984
Abstract:Thermobarometric data are compared with the ∼1100 to ∼500 Ma polyphase mobile belts from three separate areas of Africa and Antarctica, which originally lay in close proximity within Gondwana. These areas are all characterized by high-grade gneiss terranes formed at ∼1100 Ma (Grenvillian), which were subsequently reworked to a greater or lesser extent at ∼500 Ma (Pan-African). In Zambia, Malawi, Zimbabwe and western Dronning Maud Land peak metamorphic conditions at high temperatures and pressures were attained between 1100 and 850 Ma, followed by isothermal decompression (ITD). In Natal and Mozambique, voluminous collision-related granitoid intrusions emplaced between 1200 and 1000 Ma gave rise to high-temperature, moderate pressure metamorphism, with subsequent near-isobaric cooling (IBC). (Auth. mod.)
Index Terms:Tectonics; Continental drift; Geomorphology; Petrology; Geology--Maps and charts; Mineralogy; Geochronology; Antarctica--East Antarctica
Coordinates:S900000 S650000 E1710000 W0400000
Publication Type:journal article
Record ID:189578
Tags: Add Tag
No Tags, Be the first to tag this record!