The magmatic and geochemical evolution of oceanic intraplate volcanoes: constraints from the Louisville Seamounts (IODP Leg 330) and other Pacific hotspots

海洋板内火山的岩浆和地球化学演化：来自路易斯维尔海山（IODP Leg 330）和其他太平洋热点的限制

• 批准号: 242297404
• 负责人: Professor Dr. Christoph Beier
• 金额: --
• 依托单位: Geotieteiden ja maantieteen osasto
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/242297404?language=en
• 关键词: magmatic; geochemical; evolution; oceanic; intraplate

The volcanoes of long-lived, age-progressive seamount chains are likely the result of mantle plumes rising from the upper and possibly even lower mantle underneath moving lithosphere plates. The volcanoes evolve through distinct stages from a shield-building to a post-shield or even post-erosional stages over a period of several millions of years. Typically, the major element compositions range from tholeiitic to SiO2-undersaturated magmas with decreasing age of the lava. The geochemical variability observed is influenced by changes of depth and degree of partial melting but may also be influenced by the mineralogical and geochemical composition of the mantle source. These parameters likely depend on the positioning of the mantle plume relative to the lithospheric plate. The impact of mantle plume temperature, dynamics and composition on these geochemical changes is only poorly understood. This project aims at analysing volcanic glasses and olivines from seamounts of the Louisville Seamount Chain (IODP Leg 330) and other Pacific Hotspots ((Macdonald, Society, Pitcairn, Juan Fernandez) to investigate the compositional variability of primitive melts erupted on old, fast moving lithosphere. The samples are readily available in Erlangen and Kiel. The composition of the glasses allows to better constrain the composition of the primary melt compared to whole rock analyses. In addition, the O isotope composition of glasses and olivines from different hotspots will be measured to determine the O isotope variability in mantle plumes. Combined with published ages and geochemical data this is the first systematic study on the variability of mantle melts in different hotspot settings and its relationship with the mantle plume positioning relative to the lithospheric plate.

长寿命，建立年龄的海拔链的火山可能是从上部甚至在移动的岩石圈板上下方升起的地幔羽流的结果。在数百万年内，火山通过不同的阶段从盾牌建造到屏蔽后甚至壁挂后阶段的不同阶段发展。通常，主要元素组成的范围从Tholeiitic到Sio2量不饱和的岩浆，熔岩的年龄降低。观察到的地球化学变异性受深度变化和部分熔化程度的影响，但也可能受地幔源的矿物学和地球化学组成的影响。这些参数可能取决于地幔羽相对于岩石圈板的定位。地幔羽温度，动力学和组成对这些地球化学变化的影响只有鲜为人知。 This project aims at analysing volcanic glasses and olivines from seamounts of the Louisville Seamount Chain (IODP Leg 330) and other Pacific Hotspots ((Macdonald, Society, Pitcairn, Juan Fernandez) to investigate the compositional variability of primitive melts erupted on old, fast moving lithosphere. The samples are readily available in Erlangen and Kiel. The composition of the glasses与整个岩石分析相比，可以更好地限制主要熔体的组成，从而测量了来自不同热点的玻璃和橄榄石的同位素组成，以确定OPERIAPE与Myant Sedifity of Difters Sedifitions in Difts of Hotsle Meltle Meltsle Meltsle Meltsle Meltsle Melters Melts lestle Meltsle Meltsle Melters Meltsle Meltsel Meltsel Meltsel Meltsle Meltles sertsotic consection o。岩石圈板。

项目成果

Geochemistry of volcanic glasses from the Louisville Seamount Trail (IODP Expedition 330): Implications for eruption environments and mantle melting

路易斯维尔海山小道（IODP Expedition 330）火山玻璃的地球化学：对喷发环境和地幔融化的影响

• DOI: 10.1002/2013gc005086
• 发表时间: 2014
• 期刊: Geochemistry
• 影响因子: 3.7
• 作者: Nichols;Brandl
• 通讯作者: Brandl

Louisville Seamount Chain: Petrogenetic processes and geochemical evolution of the mantle source

• DOI: 10.1002/2014gc005288
• 发表时间: 2014-06
• 期刊: Geochemistry
• 影响因子: 3.7
• 作者: L. Vanderkluysen;J. Mahoney;A. Koppers;C. Beier;M. Regelous;J. Gee;P. Lonsdale