Sulfur isotopes and the origin of stibnite mineralisation in New England,Australia |
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| Authors: | Brian W Robinson Michael G Farrand |
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| Institution: | (1) Institute of Nuclear Sciences, D.S.I.R., Lower Hutt, New Zealand;(2) Geology Department, University of New England, Armidale, N.S.W., Australia;(3) Present address: Geology Department, Kuwait University, PO Box 5969, Kuwait;(4) Present address: AMDEL, PO Box 114, 5063 Eastwood, S. Australia |
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| Abstract: | Stibnite mineralisation in the antimony province of New England can be divided into Central type ores (veins of stibnite + quartz ± berthierite) and Peripheral type ores of stibnite + quartz + native antimony ± berthierite. The  Central stibnites have  34SCDT values of –5±2 (1 ) which may represent equilibrium precipitation from mantle sulfur at about 200°C. Peripheral stibnites have 34S values between 0 and –25, with a large group at 0±2. They represent precipitation from a limited supply of mantle sulfur and the acquisition of sedimentary sulfur. We consider that the different ore types were produced from distinct ore solutions derived from two immiscible melts. These originated in the deep mantle, were mobilised by tectonic activity and supplied the antimony and most of the sulfur to the ores. |
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