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IOCG MINERAL DEPOSITS, 5 Common textural replacements of rock constituents General order of hydrothermal altn/mnzn: Country rock albitization High T° Fe±K±Ca altn (Biot-garnet-Kfelds-amphybolite-cpx-mag) Mnzn+low T° altn (sulphs±mag±hem-carb±ser/chl) w/ Cu±Au Explosive bxn in most known deposits Multiple explosive fragmentation in largest orebodies
IOCG MINERAL DEPOSITS, 6 Geometry of mineralized bodies varies substantially -Commonest deposits are veins -Some are massive replacements that grade into stockworks -Bx pipes or diatremes -Tabular bodies that run concordant w/ rock foliation or stratification Composite deposits comprising veins, bxs, stockworked zones & replacement mantos are common.
Page 1 and 2: Quartz “Pods” - An Exploration
Page 3 and 4: -Goatscommon sight during field wor
Page 5 and 6: That man is crazy! He’s definitel
Page 7 and 8: Now you’ve seen them too. I disco
Page 9 and 10: Quartz Pods 2 Occur near intrusive
Page 11 and 12: QP surface expression E Solwesi, Za
Page 13 and 14: Typical QP outcrop in Zambia. Areal
Page 15 and 16: Interpreted airborne magnetometry +
Page 18 and 19: 500 km Quartz pod outcrop QP outcro
Page 20 and 21: 500 km IOCG deposits and prospects
Page 22 and 23: Sometimes country rock is deformed
Page 24 and 25: Four Rock Association Association s
Page 26 and 27: A Braided veins w/ hem + oxidized s
Page 28 and 29: Brittle character of qz allows it t
Page 30 and 31: Portion of cp-py rich, mag-filled s
Page 32 and 33: Surface expression of bo-cp-mag enr
Page 34 and 35: Large QP, NE of Otjiwarongo, Namibi
Page 36 and 37: Practical Applications of QP QP are
Page 38 and 39: Call to Other Geologists Call atten
Page 40 and 41: Conclusions 1. QP = massive/sugary
Page 42 and 43: IRON OXIDE-COPPER-GOLD MINERAL DEPO
Page 44 and 45: IOCG MINERAL DEPOSITS, 2 Mag might
Page 46 and 47: IOCG MINERAL DEPOSITS, 3 Uncertain
Page 50: Major IOCG Deposits (from Pollard,

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