The role of replacement in the origin of some cockade textures

• Published in: Economic geology and the bulletin of the Society of Economic Geologists Vol. 56; no. 1; pp. 149 - 176
• Main Authors: Kutina, Jan, Sedlácková, J
• Format: Journal Article
• Language: English
• Published: Economic Geology Publishing Company 01-01-1961
• Subjects: Cockade textures; Czechoslovakia; mineralogy; replacement origin
• ISSN: 0361-0128; 1554-0774
• DOI: 10.2113/gsecongeo.56.1.149

Cites examples from Czechoslovakian localities of cockade textures which were not formed by successive deposition of minerals around older components (fragments of rock or vein-filling material). Siderite which was the original cement of rock fragments was partially replaced along grain boundaries by quartz in the specimen from Gelnica, by quartz and later tetrahedrite in material from Polkanová, and by quartz and later sphalerite in a sample from the Príbram district. Criteria for recognition of textures formed in this manner are outlined, and it is suggested that existing descriptions of cockade textures be reviewed.