Testing mantle plume theory by reconstructing the temporal-spatial and geochemical development of hotspot volcanism linked to the Galapagos plume

通过重建与加拉帕戈斯地幔柱相关的热点火山活动的时空和地球化学发展来检验地幔柱理论

• 批准号: 5396345
• 负责人: Professor Dr. Peter Stoffers
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2003-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5396345?language=en
• 关键词: Testing; mantle; plume; theory; reconstructing

Our aim is a better understanding of the temporal-spatial distribution and geochemical variability of the Galapagos Hotspot System (GHS), a region of widespread midplate volcanism located offshore Central America. We therefore request funding for integrating high precision rock ages and geochemical data for many recently dredge-sampled GHS rock samples - together with magnetic and seismic profile information - so that we can reconstruct the development of these widely dispersed structures. This key new information will allow us to map the physical and geochemical interaction between the Galapagos plume and local spreading boundaries, reconstruct the absolute motion of the Nazca and Cocos tectonic plates, and infer the long-term behavior of the Galapagos mantle plume. Moreover, such an improved understanding of the long-term behavior of the Galapagos plume-hotspot will contribute significantly to our long-term research themes of 1) defining the mantle and lithospheric processes controlling distribution and geochemical variability of hotspot volcanism, 2) plume-ridge interaction, 3) absolute plate motion reconstruction, 4) plume fixity, 5) role of plumes in active (and passive) margin development and in creating 'Large Igneous Provinces' (LIPs) and 6) general mantle plume theory.

我们的目的是更好地了解加拉帕戈斯热点系统（GHS）的时空分布和地球化学变化，这是一个位于中美洲近海的广泛的中板块火山活动区域。因此，我们要求提供资金，对最近采掘的许多地球地质系统岩石样本进行高精度岩石年龄和地球化学数据的整合，连同磁和地震剖面信息，以便我们能够重建这些广泛分布的结构的发展。这一关键的新信息将使我们能够绘制加拉帕戈斯群岛地幔柱与当地扩张边界之间的物理和地球化学相互作用，重建纳斯卡和科科斯构造板块的绝对运动，并推断加拉帕戈斯群岛地幔柱的长期行为。此外，这种对加拉帕戈斯群岛羽状热点长期行为的更好理解将对我们的长期研究主题有重要贡献：1)定义地幔和岩石圈过程，控制热点火山活动的分布和地球化学变化；2)羽状脊相互作用；3)绝对板块运动重建；5)地幔柱在主动（和被动）边缘发育和形成“大火成岩省”中的作用；6)地幔柱理论。