The Auckland intraplate volcanic province consists of four small fields of basaltic monogenetic volcanoes. Each of these was active for a period of ~1 Myr and during the last 3 Myr the locus of magmatic activity migrated northward in discrete ~50 km steps. The most recent of these volcano fields is the Auckland Volcanic Field (AVF) in which individual eruptions have produced discrete magma batches within the composition range nephelinite to sub-alkaline basalt. This range of compositions is explained by partial melting involving variable melt/solid ratios together with modal heterogeneity in their mantle source. Eruptions in the field have been irregularly spaced during its 200 kyr life with repose periods varying between ≤0.1 and 13 kyr. Although most of Auckland's volcanoes represent a single period of eruption, paired eruption sequences in which smaller more alkaline magma batches have been followed by more voluminous less alkalic magmas have also occurred. A significant flare-up in activity at about 30 kyr produced compositionally discrete eruptions from at least five spatially separate locations all within a temporal interval of as little as 100 years. An interpretation of these data is that each event (volcano) in the AVF represents a discrete batch of magma extracted from an source with the capacity of producing a compositional variety of magma. Such a source forms when upwelling mantle undergoes adiabatic rise and exists as a metastable entity at the asthenosphere-lithosphere boundary for prolonged periods (10⁵–10⁶ years) during which time it is tapped to create individual magma batches. The shorter term magma extraction events that produced individual volcanoes in the AVF are suggested to be the result of crustal scale tectonic events. The behaviour of these four spatially separate monogenetic volcanic systems at temporal intervals of <10⁶ years is likely linked to the long term tectonic evolution of the Pacific-Australian Plate boundary beneath the New Zealand region.

奥克兰板块内火山区由四个小的玄武岩单生火山区组成。这些中的每一个都活跃了约 1 Myr，在最后 3 Myr 期间，岩浆活动的轨迹以离散的约 50 km 步长向北迁移。这些火山场中最近的一个是奥克兰火山场 (AVF)，其中个别喷发产生了离散的岩浆批次，其成分范围为霞石到亚碱性玄武岩。这一组成范围可以通过部分熔融来解释，包括可变熔体/固体比以及地幔源中的模态异质性。在其 200 kyr 寿命期间，该领域的喷发间隔不规则，静止期在 ≤0.1 和 13 kyr 之间变化。虽然奥克兰的大部分火山都代表一次喷发，成对的喷发序列也发生过，其中较小的碱性岩浆批次随后是体积较大的碱性较低的岩浆。大约 30 kyr 的活动显着爆发，在短至 100 年的时间间隔内，至少有五个空间独立的位置产生了成分上不连续的喷发。对这些数据的解释是，AVF 中的每个事件（火山）都代表从具有产生多种岩浆成分的能力的源中提取的离散批次的岩浆。当上升流地幔经历绝热上升并作为亚稳态实体长期存在于软流圈-岩石圈边界时，就会形成这种源（10 大约 30 kyr 的活动显着爆发，在短至 100 年的时间间隔内，至少有五个空间独立的位置产生了成分上不连续的喷发。对这些数据的解释是，AVF 中的每个事件（火山）都代表从具有产生多种岩浆成分的能力的源中提取的离散批次的岩浆。当上升流地幔经历绝热上升并作为亚稳态实体长期存在于软流圈-岩石圈边界时，就会形成这种源（10 大约 30 kyr 的活动显着爆发，在短至 100 年的时间间隔内，至少有五个空间独立的位置产生了成分上不连续的喷发。对这些数据的解释是，AVF 中的每个事件（火山）都代表从具有产生多种岩浆成分的能力的源中提取的离散批次的岩浆。当上升流地幔经历绝热上升并作为亚稳态实体长期存在于软流圈-岩石圈边界时，就会形成这种源（10 对这些数据的解释是，AVF 中的每个事件（火山）都代表从具有产生多种岩浆成分的能力的源中提取的离散批次的岩浆。当上升流地幔经历绝热上升并作为亚稳态实体长期存在于软流圈-岩石圈边界时，就会形成这种源（10 对这些数据的解释是，AVF 中的每个事件（火山）都代表从具有产生多种岩浆成分的能力的源中提取的离散批次的岩浆。当上升流地幔经历绝热上升并作为亚稳态实体长期存在于软流圈-岩石圈边界时，就会形成这种源（10^{5 –} 10 ⁶年）在此期间，它被挖掘以产生单个岩浆批次。在 AVF 中产生单个火山的短期岩浆抽取事件被认为是地壳尺度构造事件的结果。这四个空间分离的单生火山系统在 <10 ⁶年的时间间隔内的行为可能与新西兰地区下方太平洋-澳大利亚板块边界的长期构造演化有关。