9.) While we know that submarine black smokers and white smokers concentrate met

Question

9.) While we know that submarine black smokers and white smokers concentrate metaliferous deposits, they are generally not a target for mining companies because they occur in the deep ocean. Instead, Pohl notes on p. 23 that there are generally two types of targets for ore deposits in ophiolites, or ancient ocean floor, sequences. What are they and what kinds of metals do they host? 1.1.3 Ore formation related to alkaline magmatic rocks, carbonatites and kimberlites CT10.) According to Pohl, "Rocks of these families generally have low SiO2 and high alkali element content especially of sodium and potassium. If a rock has a high sodium and potassium content, what kinds of common crust.

Explanation / Answer

Volcanogenic massive sulfide deposits in ophiolite complexes are usually attributed to the Cyprus type. They associate with basaltic volcanics that are formed in mid-ocean or back-arc spreading centers and much less frequently in intra-plate settings. The deposits are characterized by copper or copper-zinc ores that are enriched in Ni, Co, and in places Mn and As, but are very poor in Pb and demonstrate a low to moderate content of Ag and Au.Fossil hydrothermal systems exposed in ophiolites include subsea-floor feeder-zone mineralization in volcanic rocks, diabase, and high-level gabbro, massive sulfide deposited by fluids discharging at the sea-floor/seawater interface, and peripheral Fe- and Mn-oxide facies deposited on the surrounding sea floor. The stratigraphic and structural position of Cyprus-type massive sulfide deposits in ophiolitic volcanic sequences indicate that hydrothermal activity was focused along ridge-parallel faults either in the axial graben or on the ridge flanks, and in seamounts on or near the paleoridge axis.

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