Page 67 - Introduction to Mineral Exploration

50 A.M. EVANS & C.J. MOON

Shale-siltstone
Sedimentary exhalative Zn-Pb 31a
Bedded barite 31b
Emerald veins 31c
(Basaltic Cu) (23)
(Carbonate-hosted Au-Ag) (26a)
(Sediment-hosted Cu) (30b)

I. Carbonate rocks
No associated igneous rocks
Southeast Missouri Pb-Zn 32a
Appalachian Zn 32b
Kipushi Cu-Pb-Zn 32c
(Replacement Sn) (14c)
(Sedimentary exhalative Zn-Pb) (31a)
(Karst bauxite) (38c)
Igneous heat sources present
(Polymetallic replacement) (19a)
(Replacement Mn) (19b)
(Carbonate-hosted Au-Ag) (26a)
(Fluorspar deposits) (26b)

J. Chemical sediments
Oceanic
Mn nodules 33a
Mn crusts 33b
Shelf
Superior Fe 34a
Sedimentary Mn 34b
Phosphate, upwelling type 34c
Phosphate, warm-current type 34d
Restricted basin
Marine evaporate 35a
Playa evaporate 35b
(Sedimentary exhalative Zn-Pb) (31a)
(Sedimentary Mn) (34b)

REGIONALLY METAMORPHOSED ROCKS

K. Derived mainly from eugeosynclinal rocks
Low-sulfide Au-quartz vein 36a
Homestake Au 36b
(Serpentine-hosted asbestos) (8d)
(Gold on flat faults) (37b)

L. Derived mainly from pelitic and other sedimentary rocks
Unconformity U-Au 37a
Gold on flat faults 37b