Geologia
Páginas: 4 (870 palabras)
Publicado: 18 de marzo de 2012
Adv. argillic?
Sakurajima, Kyushu: ionized gases Sociedad Geológica de Chile: July 2011
Bingham Canyon, Utah: >31 Mt Cu!
Bingham porphyry, Utah Redmond et al., 2004
80%
20%
Dioriteintrusion: if X magmatic fluid advected, intrusion heat convects ~19X meteoric water
Extreme hydrolytic = advanced argillic
propylitic
F - feldspar stable (potassic) H - hydrolytic (attackby H+) (phyllic and advanced argillic) E - caused by external fluids (propylitic and sodic-calcic)
Giggenbach, 1984, GCA
Sodic-calcic (propylitic)
Na-Ca basin brines
Potassic or phyllicLowell and Guilbert, 1970
Dilles et al., 2000
Ann Mason porphyry Cu-Mo
MacArthur porphyry Cu
Adv argillic Depth km 2 argillic sericitic potassic
4
Time >
~3 km Seedorff et al.,2005
2
4 ~3 km
Temperature
Seedorff et al., 2005
High Low
potassic
sericitic adv. arg. argillic
80%
20%
Cathodoluminscence
Redmond et al., 2004
Modified from LCMC,1994
Far Southeast porphyry, Philippines: Cu equiv. grade and quartz vein density
-100 m elev. plan
Vein density ~40%
Vein density ~5% Grade: Cu equiv Chang et al., 2011
AndalusiteAl2SiO5
Pyrophyllite Al2Si4O10(OH)2 White mica KAl3Si3O10(OH)2 Dickite / kaolinite Al2Si2O5(OH)4
(Na,Ca)1/3(Al,Mg)2(Si4O10)(OH)2!nH2O
Seedorff et al., 2005, from Hemley and Montoyo, 1964, etc. Mineral stabilities vs fluid compositions
Watanabe and Hedenquist, 2001, after Hemley et al., 1980
150
pyrophyllite muscovite
El Salvador, Chile: Watanabe and Hedenquist, 2001, afterHemley et al., 1969
Watanabe and Hedenquist, 2001
El Salvador, Chile: Watanabe and Hedenquist, 2001
Watanabe and Hedenquist, 2001
El Salvador, looking ~SE
pyrophyllite
alunite“lithocap” (late)
Watanabe and Hedenquist, 2001
Fluids from alteration at presentday level of exposure
kes
b Peb
le di
n sitio tran roph py
(andal)
dickite
Muscovite overprint...
Sakurajima, Kyushu: ionized gases Sociedad Geológica de Chile: July 2011
Bingham Canyon, Utah: >31 Mt Cu!
Bingham porphyry, Utah Redmond et al., 2004
80%
20%
Dioriteintrusion: if X magmatic fluid advected, intrusion heat convects ~19X meteoric water
Extreme hydrolytic = advanced argillic
propylitic
F - feldspar stable (potassic) H - hydrolytic (attackby H+) (phyllic and advanced argillic) E - caused by external fluids (propylitic and sodic-calcic)
Giggenbach, 1984, GCA
Sodic-calcic (propylitic)
Na-Ca basin brines
Potassic or phyllicLowell and Guilbert, 1970
Dilles et al., 2000
Ann Mason porphyry Cu-Mo
MacArthur porphyry Cu
Adv argillic Depth km 2 argillic sericitic potassic
4
Time >
~3 km Seedorff et al.,2005
2
4 ~3 km
Temperature
Seedorff et al., 2005
High Low
potassic
sericitic adv. arg. argillic
80%
20%
Cathodoluminscence
Redmond et al., 2004
Modified from LCMC,1994
Far Southeast porphyry, Philippines: Cu equiv. grade and quartz vein density
-100 m elev. plan
Vein density ~40%
Vein density ~5% Grade: Cu equiv Chang et al., 2011
AndalusiteAl2SiO5
Pyrophyllite Al2Si4O10(OH)2 White mica KAl3Si3O10(OH)2 Dickite / kaolinite Al2Si2O5(OH)4
(Na,Ca)1/3(Al,Mg)2(Si4O10)(OH)2!nH2O
Seedorff et al., 2005, from Hemley and Montoyo, 1964, etc. Mineral stabilities vs fluid compositions
Watanabe and Hedenquist, 2001, after Hemley et al., 1980
150
pyrophyllite muscovite
El Salvador, Chile: Watanabe and Hedenquist, 2001, afterHemley et al., 1969
Watanabe and Hedenquist, 2001
El Salvador, Chile: Watanabe and Hedenquist, 2001
Watanabe and Hedenquist, 2001
El Salvador, looking ~SE
pyrophyllite
alunite“lithocap” (late)
Watanabe and Hedenquist, 2001
Fluids from alteration at presentday level of exposure
kes
b Peb
le di
n sitio tran roph py
(andal)
dickite
Muscovite overprint...
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