Journal article
Implications of high-Mg# adakitic magmatism at Hunter Ridge for arc magmatism of the Fiji - Vanuatu region
A McCarthy, TJ Falloon, LV Danyushevsky, I Sauermilch, M Patriat, MM Jean, R Maas, JD Woodhead, GM Yogodzinski
Earth and Planetary Science Letters | ELSEVIER | Published : 2022
Abstract
The mostly submarine Hunter Ridge, located in the SW Pacific records a ∼12 Myr to present history of magmatism related to the opening of the North Fiji Basin and subduction of oceanic lithosphere of the South Fiji Basin. Although the Hunter Ridge is probably composed primarily of an older Vitiaz-related basement, young volcanic features are present from Matthew Island to Kadavu Island. Some dredged volcanic rocks from these features have low-FeO and high-Mg# affinities, ranging from picrites to high-Mg# andesites and dacites. Elevated Sr (500 – 3400 ppm) and Sr/Y (50 – 240) coupled to fractionated (adakitic) rare-earth element patterns (La/Yb = 5 – 40, Gd/Yb = 1.5 – 5.7) indicate a garnet-si..
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Grants
Awarded by University of Tasmania
Funding Acknowledgements
The authors are grateful for the support of Marine National Facility through voyages SS10/2004; SS06/2008 and SS03/2009; and Australian Research Council through Discovery Projects (DP0342543 and DP180102280) : Centre of Excellence funding (CE0561595) : LIEF grants (LE0347677, LE0561245, LE0989828, LE100100107, LE160100032) . AM, IS acknowledge support from ARC Discovery Project DP180102280. AM acknowledges support of SNFS grant PZ00P2_193471. IS acknowledges support from ERC Starting Grant OceaNice #802835. Additional support was provided by the Alexander von Humboldt Research Fellowship to MMJ. Support from the U.S. National Science Foundation (EAR0230145, OCE0242585, EAR0509922, OCE0728077) is also gratefully acknowledged. Support from staff at the Central Science Laboratory and CODES Analytical Laboratories at UTAS in collecting the data presented in this study is greatly acknowledged. LD and TF thank the captains and crews of the RV Southern Surveyor for the dedicated work and support during the three voyages. We are grateful for the editorial handling by R. Dasgupta and an anonymous re-viewer which helped to strengthen this manuscript.