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The setting and style of manganese mineralization in the Constantiaberg Massif, Cape Peninsula, South Africa

A. M. Killick
The setting and style of manganese mineralization in the Constantiaberg Massif, Cape Peninsula, South Africa
South African Journal of Geology (October 2020) 123 (4): 493-510

Abstract

Manganese oxyhydroxide mineralization is widespread in the Constantiaberg Massif. It is largely hosted by west-northwest - east-southeast trending brittle structures in the competent Ordovician arenites of the Peninsula Formation of the Cape Supergroup. Manganese is also found impregnating more porous Peninsula Formation arenites and Quaternary scree. This study proposes that the more significant deposits at Hout Bay and Constantiaberg differ from most of the mineralization in that they are spatially associated with saprolithic dolerite dykes belonging to the 132 Ma False Bay dolerite dike swarm. It is suggested that this deep weathering may be related to a Miocene paleo-landsurface, yielding a maximum age for these more important Mn deposits. However, there is evidence for mineralization of different ages through the Quaternary Period. Apart from Mn-mineralization hosted by rare breccias containing hydrothermal quartz, most of the mineralization is supergene, having been leached and transported in reduced acidic groundwater and precipitated at or near a redox front in a near-surface environment.


ISSN: 1012-0750
EISSN: 1996-8590
Serial Title: South African Journal of Geology
Serial Volume: 123
Serial Issue: 4
Title: The setting and style of manganese mineralization in the Constantiaberg Massif, Cape Peninsula, South Africa
Author(s): Killick, A. M.
Affiliation: 56 Orient Road, Lakeside, Western Cape, Lakeside, South Africa
Pages: 493-510
Published: 20201026
Text Language: English
Publisher: Bureau for Scientific Publications, Pretoria, South Africa
References: 46
Accession Number: 2021-003267
Categories: Economic geology, geology of ore depositsStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
S34°10'00" - S34°10'00", E18°19'60" - E18°19'60"
S34°04'00" - S34°04'00", E18°22'00" - E18°22'00"
Country of Publication: South Africa
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Abstract, Copyright, Geological Society of South Africa. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202103
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