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Showing 1 to 1 of 1 for “"Petrology; Iron; Geology"”.
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Petrography of Precambrian iron formation, Pembina County, North Dakota
… them to consist of oxide and silicate facies iron formation interlayered with quartz-biotite schist of Precambrian age. The core recovered from the Akra site contained mineral assemblages of the greenschist and amphibolite facies of regional metamorphism, the metamorphic grade increasing with …