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Spinifex texture komatiite (ultramafic composition volcanic rock) from the Red Lake Greenstone Belt, northwestern Ontario. The sample experienced retrograde metamorphism at greenschist facies. Spinifex olivine has been replaced by actinolite. Age = 3.0 Ga. Sample courtesy of Christie Rowe. Sample prepped using a pres...
The orthomagamatic sulfide deposit at Kambalda is hosted within komatiitic lavas. These ultramafic rocks are high volume melts and so can include a large amount of metal sulfide, normally a restite phase. Crystallisation of the komatiite melts was assocaited with the development of high supersaturation with respect to ...