Evolution of the Multiply Metamorphosed Broughton Arm Meta-Peridotite, and Implications for the Wider Fiordland Region

Author:

Dwight, Thomas (Tom)

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Abstract:

The Broughton Arm Meta-Peridotite is thought to represent a multiply metamorphosed ultramafic cumulate intrusion within Central Fiordland. This unit was first recognised by the QMAP Fiordland mapping program but has not been studied until now. The ultramafic body outcrops as a two oblate lobes trending north-south, encased in a thin hornblendite rim. It is situated within Early Paleozoic metasedimentary rocks that are thought to be a part of Deep Cove Gneiss (Takaka Terrane). Evidence for a cumulate origin is seen through bulk rock analysis, which return Mg# values of 78

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101 pages A4

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2016Dwight

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MULTIPOLYGON (((166.896830153942 -45.5692202092565,166.933581438918 -45.5711851829177,166.928399066234 -45.5940123755103,166.893837383282 -45.5904959874,166.896830153942 -45.5692202092565)))

Abstract PDF File

http://download.otagogeology.org.nz/temp/Abstracts/2016Dwight.pdf

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Citation

Dwight, Thomas (Tom), “Evolution of the Multiply Metamorphosed Broughton Arm Meta-Peridotite, and Implications for the Wider Fiordland Region,” Otago Geology Theses, accessed April 22, 2018, http://theses.otagogeology.org.nz/items/show/627.