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

Maintenance and Update Frequency: unknown Statement: Unknown 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...

Full description

Bibliographic Details
Other Authors: AMARSHAL (custodian), Australian Geological Survey Organisation (publisher), Commonwealth of Australia (Geoscience Australia) (distributor), Commonwealth of Australia (Geoscience Australia) (owner), Commonwealth of Australia (Geoscience Australia) (pointOfContact), Corp (hasAssociationWith), Manager Client Services (custodian), Mortimer, N. (author)
Format: Text
Language:unknown
Published: Australian Ocean Data Network
Subjects:
geoscientificInformation
GA Publication
Journal
marine
EARTH SCIENCES
Published_External
Southern Ocean
Online Access:https://researchdata.edu.au/geological-note-igneous-southern-ocean/685967
http://pid.geoscience.gov.au/dataset/ga/81416
Description
Summary:Maintenance and Update Frequency: unknown Statement: Unknown 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.

Similar Items