GSCI 1050 Lecture 22: 04.11.2017

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GSCI 1050
Jennifer Cooper Boemmels

GSCI1050-002 04.11.2017 In-class quiz today Journal 3 due tonight OYO if presenting in class please sign up today Final exam is scan-tron sheet, you can hand write the essay You don’t need to bring a device Scheduled for 1 hr 15 minutes, can go 1 hr 30 min Weighted same as midterm 2 weeks from today is last in-class quiz Groins built to protect a shoreline result in _____ on the down-current side. • Erosion • Accretion • It’s unpredictable Mining Ore What is an ore? • a rock/mineral deposit where metals have been concentrated ◦ granite has patches of iron oxide, but not much - so it’s not an ore ◦ vs. iron ore, which has about 70% iron oxide minerals - it is an ore Would you consider the gneiss of the Storrs campus as ore? No Common Ore Minerals • copper • iron • tin • lead • mercury • zinc • aluminum • chrome • nickel • titanium • tungsten • etc. Ore is generated by many physical and geochemical processes. • Processes (deposits) ◦ Magmatic deposits - Chromite ▪ fractional crystallization: sulfide ore minerals settling, sulfide ore concentrate at bottom ◦ Hydrothermal deposits (vent, vein, dissem) - Gold, silver ▪ water infiltrates into the ground & convects with magma chamber, then recirculates as warmer water, then cools as it interacts with colder water again ▪ as this water circulates through the rock, it’s flowing through fractures, comes into contact with rock ▪ some leaching of metals into water ▪ as it cools, that water loses ability to carry those minerals, so they get deposited ▪ comes down to leaching + precipitation of minerals ▪ end result is when pluton has cooled/solidified, and find some disseminated ore + vein ore (particularly concentrated) ▪ also occurs in sea vents (cold sea water seeps in vent, warms and cools, thus precipitating minerals) ◦ Secondary enrichment - Metals, copper ▪ ground water that infiltrates the subsurface & as it flows across/through it, it can even without heat source extract material along the way and deposit it elsewhere ▪ ex: downward flowing ground water, infiltrates through top of pluton, leaches material, then encounters water table, depositing material there, creating a leached zone & a secondary enrichment zone ◦ Chemical sediment - Banded iron ▪ as o2 increased, seawater’s ability to hold that dissolved iron decreased, as result iron is deposited ▪ before when sea water was low in o2, could carry lots of iron ▪ manganese nodules that start as nucleus, grow larger and larger through precipitation (look like potatoes on the
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