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Ar-Ar age constraints on the timing of Havre Trough opening and magmatism
New Zealand Journal of Geology and Geophysics ( IF 2.2 ) Pub Date : 2019-06-26 , DOI: 10.1080/00288306.2019.1602059
Richard Wysoczanski 1 , Graham Leonard 2 , James Gill 3 , Ian Wright 4 , Andrew Calvert 5 , William McIntosh 6 , Brian Jicha 7 , John Gamble 8, 9 , Christian Timm 2, 10 , Monica Handler 8 , Elizabeth Drewes-Todd 11 , Alex Zohrab 8
Affiliation  

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.

中文翻译:

Ar-Ar年龄对哈弗尔海槽开放和岩浆作用时间的限制

摘要 由于该地区缺乏地质年代学限制,哈弗尔海槽弧后系统的年龄和开放方式尚不确定。在三个实验室对来自哈弗尔海槽南部和 Kermadec Arc 的 19 块火山岩进行了 40Ar/39Ar 测年,以提供系统的年龄限制。结果被整合并解释为表明该俯冲系统年轻(<2 Ma)并且与新西兰大陆陶波火山带的开放同时期。弧岩浆作用在哈弗尔海槽的宽度上广泛地同时发生。
更新日期:2019-06-26
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