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Geological note: Igneous and sedimentary rocks dredged from the northern Macquarie Ridge, Southern Ocean

Created 24/06/2017

Updated 24/06/2017

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Altered basalt, dolerite and gabbro have been dredged from a previously unsampled portion of the Macquarie Ridge (47o-48° S), using the commercial fishing vessel Amaltal Explorer. These rocks are petrographically and geochemically similar to mafic-ultramafic volcanic and plutonic suites of MORB-like petrological affinity, collected along the ridge between 49° and 58° S by previous investigators. The northernmost part of the Macquarie Ridge (Puysegur Bank) is thus geologically related to the rest of the ridge, even though it is bathymetrically part of the New Zealand continental shelf. Sedimentary rocks dredged from 47o-48° S were derived from both oceanic Macquarie Ridge and continental New Zealand sources. There is no evidence of subduction-related magmatism along any part of the Macquarie Ridge.

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Title Geological note: Igneous and sedimentary rocks dredged from the northern Macquarie Ridge, Southern Ocean
Language English
Licence Creative Commons Attribution 4.0 International
Landing Page https://devweb.dga.links.com.au/data/dataset/92630dc2-b9c2-4b5b-8c65-5d2d01585a50
Contact Point
Geoscience Australia
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Geospatial Coverage http://www.ga.gov.au/place-names/PlaceDetails.jsp?submit1=GA1
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Geological note: Igneous and sedimentary rocks dredged from the northern Macquarie Ridge, Southern Ocean". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/geological-note-igneous-and-sedimentary-rocks-dredged-from-the-northern-macquarie-ridge-souther

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