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The Tuwu porphyry Cu deposit in the eastern Tianshan Orogenic Belt of southern Central Oceanic Orogen Belt contains 557Mt ores at an average grade of 0.58wt.% Cu and 0.2g/t Au, being the largest porphyry Cu deposit in NW China. The deposit is genetically related to dioritic and plagiogranitic porphyries that intruded the Carboniferous Qieshan Group. Ore minerals are dominantly chalcopyrite, pyrite...
Normal mid-ocean ridge basalts (MORBs) from the Southwest Indian Ridge (SWIR) (48°E–64°E) have larger ranges of 187 Os/ 188 Os ratios from 0.1295 to 0.3023 than previously reported N-MORBs. 187 Os/ 188 Os ratios show positive correlations with 1/Os, suggesting possible contamination from a component with higher 187 Os/ 188 Os ratios. Mixing modeling...
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