Geochemical and isotopic characterisation of mafic intrusions in the Fraser Zone, Western Australia

Kathleen Bathgate

doi:10.26182/hwx6-q022

Geochemical and isotopic characterisation of mafic intrusions in the Fraser Zone, Western Australia

Kathleen Bathgate

School of Earth Sciences

Research output: Thesis › Master's Thesis

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Abstract

The Albany-Fraser Orogen records widespread mafic/ultramafic magmatism in the Fraser Zone, which hosts the magmatic Ni-Cu deposit, Nova-Bollinger. Seven prospects containing mafic/ultramafic intrusives in the Fraser Zone were analysed to determine how they compare to Nova-Bollinger and if they are prospective for magmatic sulfide deposits. Broadly, similar trace element data suggest these intrusions are formed from a similar source which may be consistent with subduction modified mantle intruding into a back-arc/rift environment. Negative ENd suggest varying degrees of crustal contamination, whilst S isotopes also display some crustal signatures and possible incorporation of Archean MIF bearing Δ33S. The greatest difference between regional prospects and Nova-Bollinger is in the olivine chemistry with differences in partial melting and sulfide segregation. These differences potentially being responsible for Nova's economic sulfides and the relatively barren intrusions studied regionally.

Original language	English
Qualification	Masters
Awarding Institution	The University of Western Australia
Supervisors/Advisors	Fiorentini, Marco, Supervisor Denyszyn, Steven, Supervisor
Award date	5 Jul 2019
DOIs	https://doi.org/10.26182/hwx6-q022
Publication status	Unpublished - 2019

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Embargoed from 18/11/2019 to 18/11/2020. Made publicly available on 18/11/2020.

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10.26182/hwx6-q022

THESIS - MASTER OF SCIENCE - BATHGATE Kathleen Jennifer - 2019
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Cite this

@mastersthesis{d1e35b169acd42cbb45295e5ed72c0c0,

title = "Geochemical and isotopic characterisation of mafic intrusions in the Fraser Zone, Western Australia",

abstract = "The Albany-Fraser Orogen records widespread mafic/ultramafic magmatism in the Fraser Zone, which hosts the magmatic Ni-Cu deposit, Nova-Bollinger. Seven prospects containing mafic/ultramafic intrusives in the Fraser Zone were analysed to determine how they compare to Nova-Bollinger and if they are prospective for magmatic sulfide deposits. Broadly, similar trace element data suggest these intrusions are formed from a similar source which may be consistent with subduction modified mantle intruding into a back-arc/rift environment. Negative ENd suggest varying degrees of crustal contamination, whilst S isotopes also display some crustal signatures and possible incorporation of Archean MIF bearing Δ33S. The greatest difference between regional prospects and Nova-Bollinger is in the olivine chemistry with differences in partial melting and sulfide segregation. These differences potentially being responsible for Nova's economic sulfides and the relatively barren intrusions studied regionally.",

keywords = "magmatic sulfide deposit, Albany-Fraser Orogen, nickel-copper deposit, mafic intrusions",

author = "Kathleen Bathgate",

year = "2019",

doi = "10.26182/hwx6-q022",

language = "English",

school = "The University of Western Australia",

}

TY - THES

T1 - Geochemical and isotopic characterisation of mafic intrusions in the Fraser Zone, Western Australia

AU - Bathgate, Kathleen

PY - 2019

Y1 - 2019

N2 - The Albany-Fraser Orogen records widespread mafic/ultramafic magmatism in the Fraser Zone, which hosts the magmatic Ni-Cu deposit, Nova-Bollinger. Seven prospects containing mafic/ultramafic intrusives in the Fraser Zone were analysed to determine how they compare to Nova-Bollinger and if they are prospective for magmatic sulfide deposits. Broadly, similar trace element data suggest these intrusions are formed from a similar source which may be consistent with subduction modified mantle intruding into a back-arc/rift environment. Negative ENd suggest varying degrees of crustal contamination, whilst S isotopes also display some crustal signatures and possible incorporation of Archean MIF bearing Δ33S. The greatest difference between regional prospects and Nova-Bollinger is in the olivine chemistry with differences in partial melting and sulfide segregation. These differences potentially being responsible for Nova's economic sulfides and the relatively barren intrusions studied regionally.

AB - The Albany-Fraser Orogen records widespread mafic/ultramafic magmatism in the Fraser Zone, which hosts the magmatic Ni-Cu deposit, Nova-Bollinger. Seven prospects containing mafic/ultramafic intrusives in the Fraser Zone were analysed to determine how they compare to Nova-Bollinger and if they are prospective for magmatic sulfide deposits. Broadly, similar trace element data suggest these intrusions are formed from a similar source which may be consistent with subduction modified mantle intruding into a back-arc/rift environment. Negative ENd suggest varying degrees of crustal contamination, whilst S isotopes also display some crustal signatures and possible incorporation of Archean MIF bearing Δ33S. The greatest difference between regional prospects and Nova-Bollinger is in the olivine chemistry with differences in partial melting and sulfide segregation. These differences potentially being responsible for Nova's economic sulfides and the relatively barren intrusions studied regionally.

KW - magmatic sulfide deposit

KW - Albany-Fraser Orogen

KW - nickel-copper deposit

KW - mafic intrusions

U2 - 10.26182/hwx6-q022

DO - 10.26182/hwx6-q022

M3 - Master's Thesis

ER -

Geochemical and isotopic characterisation of mafic intrusions in the Fraser Zone, Western Australia

Abstract

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