Hawaii Plates vs Plumes

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Presentation transcript:

Hawaii Plates vs Plumes

Plume Temperature Anomalies Lherzolite with garnet and olivine porphyroblasts, taken from Google Images search Picrite, or olivine basalt showing olivine porphyroblasts taken from Google Images search

Taken from lecture slides Seismic Anomaly Taken from lecture slides Matthew Huckfeldt, Anna M. Courtier, Garrett M. Leahy, Implications for the origin of Hawaiian volcanism from a converted wave analysis of the mantle transition zone. Earth and Planetary Science Letters, Volume 373, 1 July 2013, Pages 194–204.

Diagram shows variation in R/Ra values for Helium in over time, note the large variations in values for MORB and OIB Taken from http://www.mantleplumes.org/HeliumFundamentals.html

D. Zhao (November 2007). "Seismic images under 60 hotspots: Search for mantle plumes". Gondwana Research. Elsevier. 12 (4): 335–355. Zhao, D (2004). "Global tomographic images of mantle plumes and subducting slabs: insight into deep Earth dynamics". Physics of the Earth and Planetary Interiors. 146.

??? Red: Continental flood basalt provinces/Volcanic rifted margins Yellow: Silicic LIPs Blue: Oceanic plateaux/Ocean basin flood basalt provinces From Bryan and Ernst (2008) Yellow Track: Theoretical positions of seamounts and volcanoes along the Hawaiian-Emperor chain, from reconstructions of plate motion assuming a fixed hotspot location relative the Indo-Atlantic hotspot reference frame. Red Track: The same, including east-west Antarctic motion. From Raymond et al. (2000)

Green lines are magnetic lineations. A reconstruction of Plate tectonics 80 Ma. Red lines are boundaries, dashed where inferred. Green lines are magnetic lineations. Plate reconstruction of the North Pacific 84 Ma, with a free air gravity map of the Hawaiian-Emperor seamount chain imposed on it.

Conclusions