Ar-Ar age constraints on the timing of Havre Trough opening and magmatism

Richard Wysoczanski; Graham S. Leonard; James F. Gill; Ian Wright; Andrew T. Calvert; William McIntosh; Brian Jicha; John A Gamble; Christian Timm; Monica Handler; Elizabeth Kathleen Drewes-Todd; Alex Zohrab

doi:10.1080/00288306.2019.1602059

USGS · 70215419

Ar-Ar age constraints on the timing of Havre Trough opening and magmatism

Richard Wysoczanski·Graham S. Leonard·James F. Gill·Ian Wright·Andrew T. Calvert·William McIntosh·Brian Jicha·John A Gamble·Christian Timm·Monica Handler·Elizabeth Kathleen Drewes-Todd·Alex Zohrab

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Abstract

The age and style of opening of the Havre Trough back-arc system is uncertain due to a lack of geochronologic constraints for the region. 40 Ar/ 39 Ar dating of 19 volcanic rocks from across the southern Havre Trough and Kermadec Arc was conducted in three laboratories to provide age constraints on the system. The results are integrated and interpreted as suggesting that this subduction system is young (<2 Ma) and coeval with opening of the continental Taupo Volcanic Zone of New Zealand. Arc magmatism was broadly concurrent across the breadth of the Havre Trough.

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New Zealand Journal of Geology and Geophysics Article

Source-reported bounding extent: -37.99616267972812° to -34.59704151614416° latitude; 174.990234375° to 178.857421875° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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Richard Wysoczanski, Graham S. Leonard, James F. Gill, Ian Wright, Andrew T. Calvert, William McIntosh, Brian Jicha, John A Gamble, Christian Timm, Monica Handler, Elizabeth Kathleen Drewes-Todd, Alex Zohrab. 2019-06-26. Ar-Ar age constraints on the timing of Havre Trough opening and magmatism. https://doi.org/10.1080/00288306.2019.1602059

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