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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Comment on 'Geochemistry of the Early Miocene volcanic succession of Northland,New Zealand, and implications for the evolution of subduction in the Southwest Pacific' by MA Booden, I.E.M. Smith, P.M. Black and J.L.Mauk
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Comment on 'Geochemistry of the Early Miocene volcanic succession of Northland,New Zealand, and implications for the evolution of subduction in the Southwest Pacific' by MA Booden, I.E.M. Smith, P.M. Black and J.L.Mauk

机译：I.E.M.MA Booden的评论``新西兰北地中新世早期火山演替的地球化学及其对西南太平洋俯冲演化的影响''。史密斯（PM）布莱克和J·L·毛克

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摘要

In a recent paper Booden et al. (2011) present new geochemical and petrological data of Early Miocene volcanics from the Northland region (Northland volcanic belt) in New Zealand, and interpret these data to support a particular regional tectonic model. This tectonic model involves Early Miocene westward subduction of Cretaceous Pacific oceanic lithosphere below the Northland volcanic belt and the authors interpret the volcanic belt as a continental magmatic arc. Although the new data are not in disagreement with such a tectonic model, they provide more support for an alternative interpretation that involves a northeast-dipping subduction zone. Furthermore, geometric and plate kinematic data show that the west-dipping subduction model is unviable, geological and geophysical data contradict the model, while geodynamic arguments indicate that the model is implausible. Here it will be shown that a subduction model, involving a northeast-dipping southwestward retreating slab (made of the Late Cretaceous-Paleocene South Loyalty backarc basin lithosphere) that subsequently detaches, is in agreement with the local geology, geophysics and geochemistry, is geometrically, kinematically and geodynamically viable, and fits within the regional Southwest Pacific tectonic framework.
机译：在最近的一篇文章中，Booden等人。 （2011年）提出了来自新西兰北部地区（Northland火山带）的中新世早期火山岩的新地球化学和岩石学数据，并解释了这些数据以支持特定的区域构造模型。该构造模型涉及北陆火山带以下的白垩纪太平洋中海岩石圈的中新世早期向西俯冲，作者将火山带解释为大陆岩浆弧。尽管新数据与这样的构造模型并不一致，但是它们为涉及东北俯冲带的另一种解释提供了更多的支持。此外，几何和板块运动学数据表明，西倾俯冲模型是不可行的，地质和地球物理数据与该模型相矛盾，而地球动力学论据则表明该模型是不可行的。这里将显示一个俯冲模型，该俯冲模型在几何上与局部地质，地球物理学和地球化学一致，在运动学和地球动力学上都是可行的，并且符合西南太平洋地区的构造框架。

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