Australian Museum Journal Formation of chrysocolla and secondary copper phosphates in the highly weathered supergene zones of some Australian deposits

Shortform:
Crane et al., 2001, Rec. Aust. Mus. 53(1): 49–56
Author(s):
Crane, Martin J.; Sharpe, J. L.; Williams, P. A.
Year published:
2001
Title:
Formation of chrysocolla and secondary copper phosphates in the highly weathered supergene zones of some Australian deposits
Serial title:
Records of the Australian Museum
Volume:
53
Issue:
1
Start page:
49
End page:
56
DOI:
10.3853/j.0067-1975.53.2001.1323
Language:
English
Date published:
09 May 2001
Cover date:
09 May 2001
ISSN:
0067-1975
CODEN:
RAUMAJ
Publisher:
The Australian Museum
Place published:
Sydney, Australia
Digitized:
09 May 2001
Available online:
09 May 2001
Reference number:
1323
EndNote package:
EndNote file
Title page:
Title page (8kb PDF)
Complete work:
Complete work (295kb PDF)

Abstract

Intense weathering of copper orebodies in New South Wales and Queensland, Australia has produced an unusual suite of secondary copper minerals comprising chrysocolla, azurite, malachite and the phosphates libethenite and pseudomalachite. The phosphates persist in outcrop and show a marked zoning with libethenite confined to near-surface areas. Abundant chrysocolla is also found in these environments, but never replaces the two secondary phosphates or azurite. This leads to unusual assemblages of secondary copper minerals, that can, however, be explained by equilibrium models. Data from the literature are used to develop a comprehensive geochemical model that describes for the first time the origin and geochemical setting of this style of economically important mineralization.