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Release of trace elements through the sub-greenschist facies breakdown of detrital rutile to metamorphic titanite in the Otago Schist, New Zealand

Citation

Cave, BJ and Stepanov, AS and Craw, D and Large, RR and Halpin, JA and Thompson, J, Release of trace elements through the sub-greenschist facies breakdown of detrital rutile to metamorphic titanite in the Otago Schist, New Zealand, The Canadian Mineralogist, 53, (3) pp. 379-400. ISSN 0008-4476 (2015) [Refereed Article]


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Copyright Statement

2016 by the Mineralogical Association of Canada

DOI: doi:10.3749/canmin.1400097

Abstract

Detrital rutile is observed in trace amounts in the sub-greenschist facies, graywacke, and argillite lithologies of the Torlesse Terrane-derived Otago Schist, New Zealand. Trace element analyses reveal that mean compositions of detrital rutile grains are characterized by high concentrations (5003600 ppm) of V, Cr, Fe, Zr, Nb, and W, moderate amounts (100500 ppm) of Sn and Ta, and minor amounts (50100 ppm) of Mn and Hf. Recrystallization of detrital rutile to metamorphic titanite is first observed in the prehnite-pumpellyite facies rocks, with recrystallization largely complete by upper chlorite greenschist facies. Dissolution, material transport, and precipitation reactions were crucial in the progression of this recrystallization reaction, with pore spaces generated allowing the transportation of Ca, Si, and O to the titanite-rutile interface. Redistribution of trace elements during the mineral transition of detrital rutile to metamorphic titanite was assessed using mass-balance techniques. These calculations indicate that V, Cr, Zr, Nb, Ta, and W were released during the prograde mineral reaction. The liberation of this suite of trace elements potentially provides a source for the W and Cr enrichment observed in the orogenic deposits of the Otago Schist.

Item Details

Item Type:Refereed Article
Keywords:rutile, titanite, trace element release, sub-greenschist, greenschist, mineral transition, Otago Schist, New Zealand
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Cave, BJ (Mr Ben Cave)
Author:Stepanov, AS (Mr Sasha Stepanov)
Author:Large, RR (Professor Ross Large)
Author:Halpin, JA (Dr Jacqueline Halpin)
Author:Thompson, J (Mr Jay Thompson)
ID Code:105405
Year Published:2015
Web of Science® Times Cited:4
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2015-12-23
Last Modified:2017-10-24
Downloads:0

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