Vein and skarn formation at the Cannington Ag-Pb-Zn deposit, northeastern Australia

Roache, Tony J., Williams, Patrick J., Richmond, Julie M., and Chapman, Lucy H. (2005) Vein and skarn formation at the Cannington Ag-Pb-Zn deposit, northeastern Australia. Canadian Mineralogist, 43 (1). pp. 241-262.

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Abstract

Synchronous deformation and metamorphism at the Cannington Ag–Pb–Zn deposit, in northeastern Australia, involved a phase of Ca and Mn mobilization that accounts for the distribution of pyroxene- and garnet-bearing rocks, which were preferentially overprinted by sulfide mineralization. Garnet composition and its textural association in relation to three generations of planar fabric (S1 to S3) show that skarn-related grossular-rich garnet formed in the last garnet-stable event, D3. The D3 Cl-rich biotite in the gneiss is intergrown with garnet in veins, and within skarn rocks is continuous along strike with veins of garnet {angle}pyroxmangite, hedenbergite or amphibole, which indicates a period of anhydrous through to hydrous metasomatism. Compositional maps show that infiltration extended from alteration fronts through fractures, which indicates the high permeability of S3; these maps and XGrt profiles across skarn–gneiss contacts show that there was large-scale transport of mass by infiltration and varying degrees of hydrodynamic dispersion. Precipitation of oscillatory Ca- and Mn-zoned grossular-rich garnet in veins parallel to veins filled with Cl-rich biotite, in conjunction with the distribution of biotite-filled veins across the deposit, suggest that the mass transfer during D3 may be responsible for deposit-scale Ca–Mn skarn-like zoning.

Item ID: 4528
Item Type: Article (Refereed Research - C1)
Keywords: Cannington; Australia; garnet; zoning; metasomatism; skarn; shear zones; veins
Additional Information:

Reproduced with permission from The Canadian Mineralogist.

ISSN: 1499-1276
Date Deposited: 12 Jun 2009 00:36
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8499 Other Mineral Resources (excl. Energy Resources) > 849999 Mineral Resources (excl. Energy Resources) not elsewhere classified @ 100%
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