Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean
Numerous large igneous provinces formed in the Pacific Ocean during Early Cretaceous time, but their origins and relations are poorly understood. We present new geochronological and geochemical data on rocks from the Manihiki Plateau and compare these results to those for other Cretaceous Pacific pl...
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ftunivtasecite:oai:ecite.utas.edu.au:73694 2023-05-15T15:59:56+02:00 Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean Ingle, S Mahoney, JJ Sato, H Coffin, MF Kimura, JI Hirano, N Nakanishi, M 2007 application/pdf https://doi.org/10.1130/G23741A.1 http://ecite.utas.edu.au/73694 en eng Geological Soc America http://ecite.utas.edu.au/73694/1/Ingle_et_al_Geology_2007.pdf http://dx.doi.org/10.1130/G23741A.1 Ingle, S and Mahoney, JJ and Sato, H and Coffin, MF and Kimura, JI and Hirano, N and Nakanishi, M, Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean, Geology (Boulder), 35, (7) pp. 595-598. ISSN 0091-7613 (2007) [Refereed Article] http://ecite.utas.edu.au/73694 Earth Sciences Geology Marine Geoscience Refereed Article PeerReviewed 2007 ftunivtasecite https://doi.org/10.1130/G23741A.1 2019-12-13T21:40:45Z Numerous large igneous provinces formed in the Pacific Ocean during Early Cretaceous time, but their origins and relations are poorly understood. We present new geochronological and geochemical data on rocks from the Manihiki Plateau and compare these results to those for other Cretaceous Pacific plateaus. A dredged Manihiki basalt gives an 40Ar-39Ar age of 117.9 3.5 Ma (2), essentially contemporaneous with the Ontong Java Plateau 2500 km to the west, and the possibly related Hikurangi Plateau 3000 km to the south. Drilled Manihiki lavas are tholeiitic with incompatible trace element abundances similar to those of Ontong Java basalts. These lavas may result from high degrees of partial melting during the main eruptive phase of plateau formation. There are two categories of dredged lavas from the Danger Islands Troughs, which bisect the plateau. The first is alkalic lavas having strong enrichments in light rare earth and large-ion lithophile elements; these lavas may represent late-stage activity, as one sample yields an 40Ar-39Ar age of 99.5 0.7 Ma. The second category consists of tholeiitic basalts with U-shaped incompatible element patterns and unusually low abundances of several elements; these basalts record a mantle component not previously observed in Manihiki, Ontong Java, or Hikurangi lavas. Their trace element characteristics may result from extensive melting of depleted mantle wedge material mixed with small amounts of volcaniclastic sediment. We are unaware of comparable basalts elsewhere. Article in Journal/Newspaper Danger Islands eCite UTAS (University of Tasmania) Danger Islands ENVELOPE(-54.683,-54.683,-63.433,-63.433) Pacific Plateau Central ENVELOPE(69.577,69.577,-49.389,-49.389) Geology 35 7 595 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Marine Geoscience |
spellingShingle |
Earth Sciences Geology Marine Geoscience Ingle, S Mahoney, JJ Sato, H Coffin, MF Kimura, JI Hirano, N Nakanishi, M Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean |
topic_facet |
Earth Sciences Geology Marine Geoscience |
description |
Numerous large igneous provinces formed in the Pacific Ocean during Early Cretaceous time, but their origins and relations are poorly understood. We present new geochronological and geochemical data on rocks from the Manihiki Plateau and compare these results to those for other Cretaceous Pacific plateaus. A dredged Manihiki basalt gives an 40Ar-39Ar age of 117.9 3.5 Ma (2), essentially contemporaneous with the Ontong Java Plateau 2500 km to the west, and the possibly related Hikurangi Plateau 3000 km to the south. Drilled Manihiki lavas are tholeiitic with incompatible trace element abundances similar to those of Ontong Java basalts. These lavas may result from high degrees of partial melting during the main eruptive phase of plateau formation. There are two categories of dredged lavas from the Danger Islands Troughs, which bisect the plateau. The first is alkalic lavas having strong enrichments in light rare earth and large-ion lithophile elements; these lavas may represent late-stage activity, as one sample yields an 40Ar-39Ar age of 99.5 0.7 Ma. The second category consists of tholeiitic basalts with U-shaped incompatible element patterns and unusually low abundances of several elements; these basalts record a mantle component not previously observed in Manihiki, Ontong Java, or Hikurangi lavas. Their trace element characteristics may result from extensive melting of depleted mantle wedge material mixed with small amounts of volcaniclastic sediment. We are unaware of comparable basalts elsewhere. |
format |
Article in Journal/Newspaper |
author |
Ingle, S Mahoney, JJ Sato, H Coffin, MF Kimura, JI Hirano, N Nakanishi, M |
author_facet |
Ingle, S Mahoney, JJ Sato, H Coffin, MF Kimura, JI Hirano, N Nakanishi, M |
author_sort |
Ingle, S |
title |
Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean |
title_short |
Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean |
title_full |
Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean |
title_fullStr |
Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean |
title_full_unstemmed |
Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean |
title_sort |
depleted mantle wedge and sediment fingerprint in unusual basalts from the manihiki plateau, central pacific ocean |
publisher |
Geological Soc America |
publishDate |
2007 |
url |
https://doi.org/10.1130/G23741A.1 http://ecite.utas.edu.au/73694 |
long_lat |
ENVELOPE(-54.683,-54.683,-63.433,-63.433) ENVELOPE(69.577,69.577,-49.389,-49.389) |
geographic |
Danger Islands Pacific Plateau Central |
geographic_facet |
Danger Islands Pacific Plateau Central |
genre |
Danger Islands |
genre_facet |
Danger Islands |
op_relation |
http://ecite.utas.edu.au/73694/1/Ingle_et_al_Geology_2007.pdf http://dx.doi.org/10.1130/G23741A.1 Ingle, S and Mahoney, JJ and Sato, H and Coffin, MF and Kimura, JI and Hirano, N and Nakanishi, M, Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean, Geology (Boulder), 35, (7) pp. 595-598. ISSN 0091-7613 (2007) [Refereed Article] http://ecite.utas.edu.au/73694 |
op_doi |
https://doi.org/10.1130/G23741A.1 |
container_title |
Geology |
container_volume |
35 |
container_issue |
7 |
container_start_page |
595 |
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1766395831774085120 |