Nb-depleted andesites from the Pacific-Antarctic Rise as analogues for early continental crust.
Haase K, Stroncik N, Hékinian R, Stoffers P (2005)
Publication Type: Journal article, Original article
Publication year: 2005
Journal
Publisher: Geological Society of America
Book Volume: 33
Pages Range: 921-924
DOI: 10.1130/G21899.1
Abstract
Sampling of the Pacific-Antarctic Rise close to the Foundation hotspot in the South Pacific reveals that silicic lavas erupt together with basalts on a 130-km-long part of this mid-oceanic ridge, representing the most extensive occurrence of andesites on the submarine spreading system. Most of these tholeiitic andesites and dacites have negative Nb and Ta anomalies, a signature that has so far been attributed only to subduction-related magmas and the continental crust. The silicic lavas formed by fractional crystallization from basalts and assimilation of melts from hydrothermally altered amphibolite in the oceanic crust. The presence of andesites with negative Nb and Ta anomalies on the Pacific-Antarctic Rise implies that such magmas are not restricted to subduction zones but can form at a plume-influenced mid-oceanic ridge. The andesites and dacites from the Pacific-Antarctic Rise may represent analogs to some Precambrian volcanic rocks and early continental crust. © 2005 Geological Society of America.
Authors with CRIS profile
Involved external institutions
French Research Institute for Exploitation of the Sea (Ifremer)
France (FR)
Christian-Albrechts-Universität zu Kiel
Germany (DE)
France (FR)
Christian-Albrechts-Universität zu Kiel
Germany (DE)
How to cite
APA:
Haase, K., Stroncik, N., Hékinian, R., & Stoffers, P. (2005). Nb-depleted andesites from the Pacific-Antarctic Rise as analogues for early continental crust. Geology, 33, 921-924. https://dx.doi.org/10.1130/G21899.1
MLA:
Haase, Karsten, et al. "Nb-depleted andesites from the Pacific-Antarctic Rise as analogues for early continental crust." Geology 33 (2005): 921-924.
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