First magmatism in the New England Batholith, Australia: forearc and arc–back-arc components in the Bakers Creek Suite gabbros

McKibbin, Seann J.; Landenberger, Bill; Fanning, C. Mark

doi:https://doi.org/10.5194/se-8-421-2017

Articles | Volume 8, issue 2

https://doi.org/10.5194/se-8-421-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/se-8-421-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 8, issue 2

Research article

|

05 Apr 2017

Research article |

| 05 Apr 2017

First magmatism in the New England Batholith, Australia: forearc and arc–back-arc components in the Bakers Creek Suite gabbros

Seann J. McKibbin, Bill Landenberger, and C. Mark Fanning

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Final revised paper (published on 05 Apr 2017)
Supplement to the final revised paper
Preprint (discussion started on 31 Aug 2016)
Supplement to the preprint

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

SC1: 'Where is the early Permian arc?', Pengfei Li, 02 Sep 2016
SC2: 'Relationship of Bakers Creek Suite to Hillgrove Supersuite', Heejin Jeon, 11 Sep 2016
SC3: 'Extent of Lachlan Orogen', Kim Jessop, 29 Sep 2016
RC1: 'Comments for the manuscript se-2016-123', Anonymous Referee #1, 19 Oct 2016
RC2: 'Comments on "First magmatism in the New England Orogen, Australia:Forearc and arc-backarc components in Bakers Creek Suite gabbros', Anonymous Referee #2, 21 Nov 2016
AC1: 'Reply and revised manuscript', Seann McKibbin, 27 Feb 2017

Short summary

The youngest, easternmost part of continental Australia formed in an ancient subduction zone by rifting of the crust. This drove melting of the underlying mantle, producing basaltic magmas that intruded the crust. We determined the composition and ages of these intrusives, finding that they predate other types of magmatic intrusion in the area. This indicates progression in magma types from basaltic (mantle origin), through mixed, to granitic (crust recycling) during the growth of this region.