
TY  - JOUR
A1  - Eagle, Ryan M. 
A1  - Birch, William D. 
A1  - McKnight, Stafford 
T1  - Phosphate minerals in granitic pegmatites from the Mount Wills District, north-eastern Victoria
JF  - Proceedings of the Royal Society of Victoria
JO  - Proc. R. Soc. Vic.
Y1  - 2015
VL  - 127
IS  - 2
SP  - 55
EP  - 68
KW  - 
UR  - https://doi.org/10.1071/RS15018 
N2  - Tin- and tantalum-bearing LCT-type granitic pegmatites occur in a 45 km long belt between Eskdale and Mount Wills in north-eastern Victoria. Near Mount Wills, several compositionally zoned rare-element pegmatites contain complex assemblages of primary and secondary phosphate minerals, many of which are rare and previously unrecorded in Victoria. The phosphate assemblages can be divided into Al-rich and Fe&#x2013;Mn-rich suites, in addition to ubiquitous fluorapatite. The Al-rich phosphate suite includes montebrasite, scorzalite, bertossaite and brazilianite. The Fe&#x2012;Mn phosphate suite includes heterosite, phosphoferrite, wolfeite, alluaudite (sp.), arrojadite (sp.) and jahnsite (sp.), derived from the metasomatic alteration of primary triplite. Further hydrothermal alteration of this assemblage has resulted in a secondary suite of strengite, rockbridgeite, phosphosiderite, whiteite, jahnsite and whitmoreite forming in etch cavities and fractures. A Late Silurian age of 420&#xb1;4 Ma was obtained from one of the dykes via CHIME radiometric dating of monazite, suggesting a similar age for the adjacent Mount Wills Granite, which has not been reliably dated. This highly fractionated, peraluminous granite is presumed to be the source of the rare-element pegmatites based on their close spatial relationship. 
ER  -

