Reconnaissance Basement Geology and Tectonics of North Zealandia
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New rock dredge samples supply key information to establish the tectonic and geological framework of the northern two-thirds of the 95% submerged Zealandia continent. The R/V Investigator voyage IN2016T01 to the Fairway Ridge, Coral Sea, obtained poorly sorted poly-lithologic pebbly to cobbly sandstones, well sorted fine grained sandstones, mudstones, bioclastic limestones, and basaltic lavas. Post-cruise analytical work comprised petrography, whole rock geochemical and Sr and Nd isotopic analyses, and U-Pb zircon, Rb-Sr, and Ar-Ar geochronology. A Fairway Ridge cobbly sandstone has a ∼95 Ma (early Late Cretaceous) depositional age; two biotite granite cobbles are 111 ± 1 and 128 ± 1 Ma in age, and some volcanic pebbles are also likely Early Cretaceous. Fairway Ridge basalts have intraplate alkaline chemistry and are of Late Eocene age (∼40–36 Ma). By analogy with South Zealandia, we interpret strong positive continental magnetic anomalies of North Zealandia to mainly result from Late Cretaceous to Cenozoic intraplate basalts, many of them rift-related lavas. A new basement geological map of North Zealandia shows the position of the Mesozoic Gondwana magmatic arc axis (Median Batholith) and other major geological units. This study completes onland and offshore reconnaissance geological mapping of the entire 5 Mkm2 Zealandia continent.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | e2023TC007961 |
| Tidsskrift | Tectonics |
| Vol/bind | 42 |
| Udgave nummer | 10 |
| Antal sider | 28 |
| ISSN | 0278-7407 |
| DOI | |
| Status | Udgivet - 2023 |
Bibliografisk note
Funding Information:
We thank the crew of R/V voyage IN2016T01, especially Captain John Highton, and Australia's CSIRO Marine National Facility Voyage Managers Lisa Woodward and Doug Thost. Generous onboard help was given by our colleagues Jo Whittaker, Nick Herold, Lena O’Toole, Isabelle Sauermilch, Joanna Tobin, and Serena Yeung. We acknowledge the Parc Naturel de la Mer de Corail, Direction des Affaires Maritimes de la Nouvelle‐Calédonie, and the Government of New Caledonia for authorizing rock dredging work on the Fairway Ridge. Permission to reproduce seismic line P702C was granted by Fugro NV. Post‐voyage technical assistance was provided by Ben Durrant, John Simes, Belinda Smith Lyttle, Malcolm Reid, Noreen Evans, Brad McDonald, and Thomas Ludwig. Earlier versions of the manuscript were improved by comments from Nathan Daczko, Jim Calzia, Michael Clynne, Jacqueline Halpin, Jonathan Aitchison, and an anonymous reviewer. Mortimer's work was funded by New Zealand Ministry of Business, Innovation and Employment, Strategic Science Investment Fund Grant C05X1702 to GNS Science's Research Programme and by a New Zealand Government James Cook Research Fellowship, administered by the Royal Society Te Apārangi. Investigator Understanding Te Riu‐a Māui/Zealandia
Funding Information:
We thank the crew of R/V Investigator voyage IN2016T01, especially Captain John Highton, and Australia's CSIRO Marine National Facility Voyage Managers Lisa Woodward and Doug Thost. Generous onboard help was given by our colleagues Jo Whittaker, Nick Herold, Lena O’Toole, Isabelle Sauermilch, Joanna Tobin, and Serena Yeung. We acknowledge the Parc Naturel de la Mer de Corail, Direction des Affaires Maritimes de la Nouvelle-Calédonie, and the Government of New Caledonia for authorizing rock dredging work on the Fairway Ridge. Permission to reproduce seismic line P702C was granted by Fugro NV. Post-voyage technical assistance was provided by Ben Durrant, John Simes, Belinda Smith Lyttle, Malcolm Reid, Noreen Evans, Brad McDonald, and Thomas Ludwig. Earlier versions of the manuscript were improved by comments from Nathan Daczko, Jim Calzia, Michael Clynne, Jacqueline Halpin, Jonathan Aitchison, and an anonymous reviewer. Mortimer's work was funded by New Zealand Ministry of Business, Innovation and Employment, Strategic Science Investment Fund Grant C05X1702 to GNS Science's Understanding Te Riu-a Māui/Zealandia Research Programme and by a New Zealand Government James Cook Research Fellowship, administered by the Royal Society Te Apārangi.
Publisher Copyright:
© 2023. American Geophysical Union. All Rights Reserved.
ID: 370488151