Högbomite in migmatitic paragneiss in the Betroka shear belt, Vohidava area, Precambrian of southern Madagascar

Autor:	T. Razakamanana, Dietrich Ackermand, Brian F. Windley
Rok vydání:	2000
Předmět:	Hercynite Geochemistry Cordierite engineering.material Precambrian Leucogranite chemistry.chemical_compound Geophysics Shear (geology) chemistry Geochemistry and Petrology visual_art visual_art.visual_art_medium engineering Chlorite Ilmenite Geology Pyrophyllite
Zdroj:	Mineralogy and Petrology. 68:257-269
ISSN:	1438-1168 0930-0708
DOI:	10.1007/s007100050012
Popis:	¶The Betroka sinistral shear belt is a major geotectonic unit in the Precambrian of southern Madagascar. It consists of migmatitic paragneiss commonly interlayered with phlogopite-bearing diopsidite, phlogopite-humite-diopside-spinel marble, sillimanite-garnet quartzite and syn-tectonic S-type leucogranite. Hogbomite occurs sporadically in the migmatitic paragneiss in patches of magnetite with hercynite, and at the border of magnetite where it is in contact with hercynite, rare ilmenite, rutile and cordierite, which contains a network of chlorite, pyrophyllite and rare corundum/diaspore. XMg = Mg/(Mg + Fe) decreases as follows: Crd > Bt > Chl > Hog > Hc. The textural relations suggest the following hogbomite-participating reactions
Databáze:	OpenAIRE
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