A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2019; you can also visit the original URL.
The file type is application/pdf
.
CONSIDERAÇÕES SOBRE A ORIGEM DOS GRÃOS "OLHOS-DE-QUARTZO" NAS ROCHAS PORFIROIDAIS DO DISTRITO DE WESTERN MINES, ILHA DE VANCOUVER,CANADA
1981
Revista Brasileira de Geociências
Quartz-eye bearing porphyroidal rocks occur in straight association with the vent ore, in the vent zone, of the base metal massive sulphide deposits of the Western Mines District. Microscopic observations on these rocks indicated two stages of quartz-eye development, which are part of a continuous process of rock alternation. In the earlier stage (first generation quartz) there was a total or quasi-total replacement of chloritecalcite spherulites or a filling of vesicles by quartz. It was
doi:10.25249/0375-7536.19813649
fatcat:w7zujrhuvfa7hjlnqunyhjgxwy