Age progressive volcanism opposite Nazca plate motion: Insights from seamounts on the northeastern margin of the Galapagos Platform
作者: Christopher W. SintonFolkmar HauffKaj HoernleReinhard Werner
作者单位: 1Department of Environmental Studies and Sciences, Ithaca College, Ithaca, NY 14850, USA
2GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1-3, D-24148 Kiel, Germany
3Institute of Geosciences, University of Kiel, Ludewig-Meyn-Strasse 10, D-24118 Kiel, Germany
刊名: LITHOS, 2018, Vol.310-311 , pp.342-354
来源数据库: Elsevier Journal
DOI: 10.1016/j.lithos.2018.04.014
关键词: GalapagosOcean islandsSeamountsNazca PlateShear driven upwelling
英文摘要: Abstract(#br)We present new geochemical and 40 Ar/ 39 Ar analyses from seven seamounts located off the northeastern margin of the shallow Galápagos Platform. Initial volcanism at 5.2 Ma created a small island (Pico) over the current location of the hotspot with geochemically enriched lavas. There is no further record of magmatism in the study area until 3.8 to 2.5 Ma, during which four roughly conical volcanoes (Sunray, Grande, Fitzroy, and Beagle) formed through eruption of lavas derived from a depleted mantle source. Sunray, Fitzroy, and Grande were islands that existed for ~3 m.y. ending with the submergence of Fitzroy at ~0.5 Ma. The youngest seamounts, Largo and Iguana, do not appear to have been subaerial and were active at 1.3 Ma and 0.5 Ma, respectively, with the style of edifice...
全文获取路径: Elsevier  (合作)
影响因子:3.779 (2012)

  • motion 运动
  • progressive 进步的
  • driven 从动的
  • northeastern 来自东北的
  • opposite 对生的
  • upwelling 涌出
  • margin 边限
  • volcanism 火山酌
  • plate