NASC 130 Essentials3_ch12

12 riches in rock energy mineral resources ore

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Unformatted text preview: e… Pyrite Chalcopyrite Bornite Galena Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Ore Formation Hydrothermal deposits Hydrothermal Minerals deposited by hot, chemically active fluids Common in rocks heated by plutonic intrusions Often crystallize in rock fractures as vein deposits Often Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Ore Formation Hydrothermal deposits Black smokers - Occur along all mid ocean ridges Seawater in cracked hot crust is heated, picking up metals Water cycles back to the cold ocean, metals crystallize out Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Ore Formation Secondary-enrichment deposits Secondary-enrichment Groundwater leaches and oxidizes primary sulfide ores By adding O2, OH, and CO2 some secondary ores are prized Malachite Azurite Turquoise Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Ore Formation Mississippi Valley-type (MVT) ores Orogenic belts “squeegee” hot water through deep basins Orogenic The hot water leaches minerals and carries them along Where basin brines surface and cool, they deposit metals Where MVT lead-zinc (Pb-Zn) deposits Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Ore...
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