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

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

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

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Wysoczanski_et_al_NZJGG_track.pdf(161.47 KB)

Accepted Version

Date

2019

Authors

Wysoczanski, Richard J.

Leonard, Graham

Gill, James

Wright, Ian

Calvert, Andrew T.

McIntosh, William

Jicha, Brian

Gamble, John A.

Timm, Christian

Handler, Monica

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Publisher

Taylor and Francis Group

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. 40Ar/39Ar 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.

Keywords

Havre Trough , Kermadec Arc , Ar-Ar , Magmatism , Back-arc basin , Rifting

Citation

Wysoczanski, R., Leonard, G., Gill, J., Wright, I., Calvert, A., McIntosh, W., Jicha, B., Gamble, J., Timm, C., Handler, M., Drewes, E. and Zohrab, A. (In press) 'Ar-Ar age constraints on the timing of Havre Trough opening and magmatism', New Zealand Journal of Geology and Geophysics.