Possible explanations for the localization of residual hematite ore on a Precambrian iron formation

Autor:	W. H. Gross, A. B. Baldwin
Rok vydání:	1967
Předmět:	Geochemistry Mineralogy Geology Weathering Hematite engineering.material Conglomerate Ironstone Precambrian Geophysics Geochemistry and Petrology visual_art visual_art.visual_art_medium engineering Economic Geology Banded iron formation
Zdroj:	Economic Geology. 62:95-108
ISSN:	1554-0774 0361-0128
DOI:	10.2113/gsecongeo.62.1.95
Popis:	Primary banded iron formation near Fort Gouraud, Mauritania, contains about 30 percent iron. Four kinds of hematite concentration (roughly 65 percent iron) are recognized. 9Deep hematite ore9 is believed to be syngenetic, since it is chemically similar to the associated iron formation; its direction of remanent magnetism indicates that it is Precambrian and pre-structure, and it occurs as boulders in overlying Cambrian conglomerate. 9Hard surface ore9 and underlying 9soft plaquette ore9 are believed to be products of Tertiary weathering. 9Talus ores9 have accumulated recently on some slopes.
Databáze:	OpenAIRE
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