Protodolomite in Daito jima, Okinawa

This report describes protodolomites found in Daito-jima to the east of the Okinawa Islands, Japan. To investigate the conditions for sedimentary protodolomite formation, the distribution and chemical composition of protodolomites were studied through field observations and laboratory analyses. From...

Full description

Saved in:
Bibliographic Details
Published inGEOCHEMICAL JOURNAL Vol. 15; no. 4; pp. 199 - 207
Main Authors Ohde, Shigeru, Kitano, Yasushi
Format Journal Article
LanguageEnglish
Published GEOCHEMICAL SOCIETY OF JAPAN 01.01.1981
Online AccessGet full text

Cover

More Information
Summary:This report describes protodolomites found in Daito-jima to the east of the Okinawa Islands, Japan. To investigate the conditions for sedimentary protodolomite formation, the distribution and chemical composition of protodolomites were studied through field observations and laboratory analyses. From the thin section studies of carbonate rocks, it was observed that porous parts of coral were cemented by protodolomite crystals and that aragonite in hard tissue of coral was transformed into protodolomite. These observed facts may show that protodolomite was formed through the transformation from aragonite and magnesian calcite in magnesium rich solution. The distribution and chemical composition of protodolomite in Minami-daito-jima suggest that protodolomites may be formed in concentrated seawater.
ISSN:0016-7002
1880-5973
DOI:10.2343/geochemj.15.199