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Reaction rind formation in the Catalina Schist: Deciphering a history of mechanical mixing and metasomatic alteration. by Sarah Penniston-dorland and Gray Bebout. Download Free PDF Download PDF Download Free PDF View PDF. Very-low-temperature record in subduction process: A review of worldwide lawsonite eclogites ...
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Sample 98Z75 represents an ∼80 kg block of schist, which was broken up and cleaned by hammer chipping in the field. The resulting sample consisted of ∼8 kg of fragments of 2-10 cm size. These were reduced to chips of 3-10 mm in a jaw crusher. About 1·5 kg of the chips were crushed in several steps in a swing mill and screened to <0·5 mm.
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Over most of the area occupied by the schists, but especially in that portion lying east of a north and south line passing through Govern-ment Peak, the predominant type of rock represented is a mica-albite' schist. This rock shows a highly developed schistosity. It is usually a dark silvery-gray in color, but where weathered may be stained
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Background copper values for the major rock types (gneiss, quartz diorite, the Pelona Schist, and mylonitic rocks) are low, rang-ing from 7 ppm in gneiss and quartz diorite to 20 ppm in the Pelona Schist. Most quartz, hematite, and siderite veins are low in copper (background, 15 ppm); quartz monzonite, latite, and pegmatite dike rocks are very ...
Get priceThe quartzofeldspathic mica-Ranges and Chimanimani Mountains in the schist exhibits granolepidoblastic texture south, through a series of outliers in the but the rocks in this formation are Chicamba Dam area to the Bandula region characterized by mylonitic and and is bounded by Messica granite gneiss in micromylonitic textures (Monso, 1978 ...
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The transfer of fluid and trace elements from the slab to the mantle wedge cannot be adequately explained by simple models of slab devolatilization. The eclogite-facies mélange belt of northern New Caledonia represents previously subducted oceanic crust and contains a significant proportion of talc and chlorite schists associated with serpentinite. These rocks host large quantities of H2O and ...
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