Skip Nav Destination
GEOREF RECORD
Altered pyroclastic rocks in South African iron-formation
G. L. LaBerge
Altered pyroclastic rocks in South African iron-formation
Economic Geology and the Bulletin of the Society of Economic Geologists (May 1966) 61 (3): 572-581
Altered pyroclastic rocks in South African iron-formation
Economic Geology and the Bulletin of the Society of Economic Geologists (May 1966) 61 (3): 572-581
Index Terms/Descriptors
Latitude & Longitude
Abstract
Hundreds of layers composed dominantly of stilpnomelane occur in thick extensive iron-formation in the Transvaal system in South Africa. Examination of thin sections reveals that many of these layers contain axiolitic shard-like structures, suggesting that they are altered pyroclastic material, presumably water-laid tuffs. A comparison is made with similar stilpnomelane-rich layers in iron-formation from Western Australia. The presence of these altered pyroclastic layers indicates that there was volcanic activity during much of the time the iron-formation was being deposited.
ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 61
Serial Issue: 3
Title: Altered pyroclastic rocks in South African iron-formation
Author(s): LaBerge, G. L.
Pages: 572-581
Published: 196605
Text Language: English
Publisher: Economic Geology Publishing Company,
Lancaster, PA,
United States
Accession Number: 1967-000461
Categories: Economic geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
S35°00'00" - S22°00'00", E16°00'00" - E33°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
Update Code: 1967