The Origin of Intraplate Volcanism in New Zealand

新西兰板内火山活动的起源

• 批准号: 5425387
• 负责人: Professor Dr. Kaj Hoernle
• 金额: --
• 依托单位: Forschungseinheit Magmatische und Hydrothermale Systeme
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5425387?language=en
• 关键词: Origin; Intraplate; Volcanism; New; Zealand

Intraplate volcanism has occurred nearly continuously in different parts of Zealandia (New Zealand microcontinent) since it began to break away from Gondwana at ca 110 Ma. Even though Zealandia has moved 6000 km to the northwest with respect to the underlying mantle since it separated from Antarctica, the volcanism does not continue onto the adjacent ocean floor and thus seems to be linked to the microcontinent. The volcanism is widespread but generally of low volume except the large mid to late Miocene composite shield volcanoes forming the Banks and Otago Peninsulas. In addition, it occurred repeatedly in several restricted areas throughout the Late Cretaceous and the Cenozoic. The origin of this volcanism on Zealandia cannot be adequately explained by either of the major models for intraplate continental volcanism: 1) passage of the lithosphere over mantle hotspots (or plumes) or 2) decompression melting related to lithospheric thinning resulting from continental rifting. Combining regional age dating with petrologic and geochemical investigations, we propose to reconstruct the temporal and spatial evolution of the Late Cretaceous to Quaternary volcanism. In collaboration with New Zealand colleagues, we will develop a model explaining intraplate volcanism on Zealandia, which can also be applied to other fast moving plates with large variations in lithospheric thickness. The project promises to provide fundamental new insights into the origin of intraplate volcanism.

自从西兰大陆（新西兰微大陆）在大约 110 Ma 开始脱离冈瓦纳大陆以来，板内火山活动几乎连续不断地在西兰大陆的不同地区发生。尽管西兰大陆自与南极洲分离以来相对于底层地幔已向西北移动了 6000 公里，但火山活动并未继续到邻近的海底，因此似乎与微大陆有关。火山活动广泛，但总体规模较小，除了形成班克斯和奥塔哥半岛的大型中新世中晚期复合盾状火山外。此外，它在整个晚白垩世和新生代的几个限制地区反复发生。西兰大陆火山活动的起源无法用板内大陆火山活动的任何一个主要模型来充分解释：1）岩石圈越过地幔热点（或地幔柱）或2）与大陆裂谷导致的岩石圈减薄相关的减压熔融。将区域年龄测定与岩石学和地球化学研究相结合，我们建议重建晚白垩世至第四纪火山活动的时空演化。我们将与新西兰同事合作，开发一个模型来解释西兰大陆的板内火山作用，该模型也可以应用于岩石圈厚度变化较大的其他快速移动的板块。该项目有望为板内火山活动的起源提供根本性的新见解。

项目成果

Interactions between carbonate magmas and MARID metasomes: the case of diamondiferous aillikites from the Torngat Mountains, Canada

碳酸盐岩浆与 MARID 变体之间的相互作用：以加拿大托恩盖特山脉含金刚石埃利风岩为例

• DOI: 10.1016/j.gca.2007.06.027
• 发表时间: 2007
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Timm; C.;Rüpke; L.;Hoernle; K.
• 通讯作者: K.

Lithospheric removal: The cause of widespread Cenozoic intraplate volcanism on Zealandia?

岩石圈移除：西兰大陆新生代板内火山作用广泛的原因？

• DOI: 10.1016/j.gca.2006.06.514
• 发表时间: 2006
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Hoernle; K.;White; J.;van den Bogaard; P.;Hauff; F.;Coombs; D.;Werner; R.;Timm; C.;Garbe;Reay; A.;Cooper; A.
• 通讯作者: A.