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Tabla 2. Fórmulas y bandas de serie CROSTA aplicadas a datos ASTER
Mineral o alteración Clave Fórmula ASTER Serie CROSTA Observaciones
Alunita ALI (7/5)(7/8) 1357
Alunita 6/5
OHIa
(7/6)(4/6)
OHIb
(7/5)(4/5)
Arcillas Clay (5+7)/6
Arcillas Clay2 (5/6)(7/6)
Alt. Argilica: Alu / kao / Pyro/ Arg (4+6)/5 (4+6)/(5*2)
Alt. Argilica avanzada 6/5
Alt. Filica: Phy (4+7)/6
Alt. Filica: 7/5
Alt. Filica: (Ser/Mus/ili/sme) Phy2 (5+7)/6
Alt. Propilica 8/5
Calcite y/o Clorita CLI (6/8)(9/8)
Kaolinita KLI (4/5)(8/6) 1467
Kaolinita KLIa 7(5+6)
Kaolinita 4/6 si
Kaolinita
Kaolinita + Smectite 1469
Illita Illi 1356 (4+7) / (6*2)
Illita Illi 1456 (4+7) / (6*2)
Muscovita 7/6 (4+7)/(6*2) (7+9)/(8*2)
OXIDOS: ferrico Fe3+ 2/1
OXIDOS: hematita* 3/1 *Req. Mascara de Vegetaciónn
Silicato Ferroso 5/4
GOSSAN 4/2
Oxido ferroso Fe2+ 5/3 + ½
Silicatos Ferrosos 4/3 *Alteración Oxido Fe, Cu - Au
Jarosita 4/7 (Origel Gutierrez)
Goetita (Origel Gutierrez)
Silice SiO2 Si 13/12
Rocas ricas en Cuarzo 14/12
Cuarzo, Carbonato QI (11/10)(11/12)
SiO2_3 11/10
SiO2_4 11/12
SiO2_5 13/10
SiO2_2 SiO2_2 ((11*11)/10) / 12
IInverso Silice (Feldespatos Alcalinos) (12/13) QI
Indice de Grado Basico 12/13
Granitoide (12/11)(11/10)
Dolomita (6+8)/7 ** (Origel Gutierrez) (6+8)/(7*2)
Carbonato 13/14 4689
Carbonato/Clorita/Epidota (7+9)/8
Epidota / Clorita / Anfibole (6+9)/(7+8)
Clorita 5/8 2458 / 2489
(4+7)/5
(4+7)/6
3457 PC4
3467
321
3479
5678
2358
12471259
Clorita
(Origel Gutierrez)
1358
PC4
PC3
Common Ratio & Band Combinations ASTER
Features Red Green Blue Reference Vegetation and visible bands**
3, 3/2, or NDVI
2 1
AlOH minerals/advancedargillic alteration***
5/6 (phen) 7/6 (musc) 7/5 (kaol) Hewson (CSIRO)
Clay, amphibole, laterite (5x7)/62 (clay) 6/8 (amph) 4/5 (lat) Bierwith
Gossan, alteration, host rock
4/2 (goss) 4/5 (alt) 5/6 (host) Volesky
Gossan, alteration, host rock
6 (goss) 2 (alt) 1 (host)
Decorellation (envi) 13 12 10 Bierwith
Silica, carbonate, basic degree index
(11x11)/10/12 (silica)
13/14 (carb) 12/13 (basic) Bierwith
Silica, carbonate (11x11)/(10x12) 13/14 12/13 Ninomiya
Silica 11/10 11/12 13/10 CSIRO
Discrimination for mapping
4/1 3/1 12/14 Abdelsalam
Discrimination in sulphide rich areas 12 5 3
Discrimination 4/7 4/1 (2/3) x (4/3) Sultan
Discrimination 4/7 4/3 2/1 Abrams (USGS)
Silica, Fe2+
14/12(1/2) + (5/3) MNF Band 1 Rowan (USGS)
Enhanced structural features
7 4 2 Rowan (USGS)
*Comments by Hewso**Equivalent to Landsat RGB 432 ***Alunite/pyrophyllit
n
e, mica, kaolinite/dickite
(8)
Features Red Green Blue Reference
Common Ratio & Band Combinations ASTER
4 5 9 (6) Assiri
Alteracion en color blanco y magenta
3/1 4/6 7/5 Alteracion Argilica en color verde y blanco amarillo
PC2 PC3 PC5 En Porfidos, la Alteraciones de color amarillo
PCA de las 6 Bandasdel SW IR
Para separar unidadesgeologicas 4/5 3 PC4 PCA de las 5 Bandas
del T IR
Usar Decorrelation Stretch
Tabla 2. Fórmulas y bandas de serie CROSTA aplicadas a datos ASTER
Mineral o alteración Fórmula ASTER Observaciones