STRUCTURE OF THE ROSEBERY PB-ZN ORE DEPOSIT Supplementary material to Aerden, 1991 (J. Struct. Geol.)

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Presentation transcript:

STRUCTURE OF THE ROSEBERY PB-ZN ORE DEPOSIT Supplementary material to Aerden, 1991 (J. Struct. Geol.)

Aerden 1991 – J. Struct. Geol.

100m WOODEN BLOCKS MODEL

Fold interpretation of Brathwaite, ORE LENS E ORE LENS G ORE LENS F

Fold interpretation of Green, ORE LENS E ORE LENS G ORE LENS F

Fold interpretation of Huston & Zaw 1988 consistent eastward vergence of parasitic folds in host rock conflicts with previous fold interpretation of the orebody 45 longitudinal cross-section line (next slide) ORE LENS E ORE LENS G ORE LENS F

200m 15 level 17 level longitudinal cross-section modified after Aerden 1991

sulfuros masivos sulfuros masivos ore lenses cut folded bedding in host rock and are parallel to foliation Aerden – J. Struct. Geol. 1991

Extensional ramp FOLIATION BOUDINAGE modified after Aerden 1991

similar foliation boudinage geometries in marbles of the Nevado- Filabride Complex, Betic Cordillera

Aerden JSG 1991 (Fig. 17) barite-rich massive sulphides replacing shear zone

Py-Cpy ore (Cu-rich) Sph-Gal-Py ore (Pb-Zn-rich) modified after Aerden 1991

genetic model Aerden JSG 1991

CROSS-SECTION MAP Aerden – J. Metamorphic Geol FIGURE 2

modified after Aerden 1991

REPLACEMENT TEXTURES

Sphalerite-rich massive sulphides containing numerous fragments of schistose host rock miniature of Rosebery ore body (Aerden 1991)

FeS 2 PbS host-rock fragment containing S3 crenulation cleavage sharply truncated by massive sulphides. The sulphides post-date the cleavage (from Aerden 1994). Aerden – J. Metamorphic Geol FIGURE 12

Sphalerite replacing host rock controlled by microboudinage Aerden – J. Metamorphic Geol FIGURE 17

Massive Galena-Sphalerite-Pyrite ore (BLACK) replacing quartz. Quartz grains with identical optical orientations have been given the same coloured ornament pattern. Aerden – J. Metamorphic Geol FIGURE 8

Massive Galena-Sphalerite-Pyrite ore (BLACK) replacing quartz end large feldspar crystal. Aerden – J. Metamorphic Geol FIGURE 10

S 2 (main cleavage) S 3 (crenualation cleavage) S 0 (folded bedding) Sphalerite Chlorite Hercules Mine Aerden - Econ. Geol ther geometries of replaced host- rock domains are controlled by S3 and S2 cleavages. The ore appears preferentially located in short-limb domains of folds (yellow line)

pyrite I chlorite- quartz-carbonate-barite pyrite II Chalcopyrite, Galena, Sphalerite time Py-Cpy-Chl-Q Sph-Ga-Py-Q Ca-Feld-Ba (+Sph, Ga) sericite-carbonate-quartz-chlorite alteration observed mineral zoning from structural trap outward

syn-D3 replacement of host rock by pyrite-quartz gangue (S2 reactivated during D3) S3

mechanical remobilization of sulphides into late fractures formed at the sulphide (soft) - hostrock interface (piercement structures) host-rock banded massive sulphides

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