ABSTRACT Numerous igneous bodies within the Deepwater Taranaki Basin are recognised mainly from seismic data and range from Early Cretaceous to Pliocene in age. They were all emplaced within an intra-plate setting but are scattered apparently at random in time and space. This paper describes the occurrences of igneous rocks within the basin as interpreted from seismic data, and discusses their possible origin. There are no indications of hotspot tracks within the Zealandia micro-continent so an alternative origin is sought. Previous authors see the main cause of volcanism as decompression melting due to localised lithospheric detachment and the movement of the Zealandia plate across the mantle as incidental. It is suggested that the movement of the Zealandia lithosphere, in the order of 4000 km to the north-northwest since the Cretaceous, may have caused drag across the asthenosphere, which in turn created transient small-scale convection cells that assisted the process of decompression melting as a modification to the accepted theory.

中文翻译：

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新西兰深水塔拉纳基盆地火成岩的地震识别及其分布

摘要 深水塔拉纳基盆地内的许多火成岩体主要是从地震数据中识别出来的，其年龄范围从早白垩世到上新世。它们都被安置在一个板块内的环境中，但在时间和空间上显然是随机分散的。本文描述了从地震数据解释的盆地内火成岩的产状，并讨论了它们可能的成因。西兰西亚微大陆内没有热点轨迹的迹象，因此正在寻找替代来源。以前的作者认为火山活动的主要原因是由于局部岩石圈脱离而导致的减压融化，而西兰板块在地幔上的运动是偶然的。据推测，自白垩纪以来，Zealandia 岩石圈向西北偏北方向移动了 4000 公里，