scholarly journals Mantle plume capture, anchoring, and outflow during Galápagos plume-ridge interaction

2015 ◽  
Vol 16 (5) ◽  
pp. 1634-1655 ◽  
Author(s):  
S. A. Gibson ◽  
D. J. Geist ◽  
M. A. Richards
Keyword(s):  
Mantle Plume ◽  
Galapagos Plume

scholarly journals Asthenospheric zircon below Galápagos dates plume activity

2021 ◽  
Author(s):  
Yamirka Rojas-Agramonte ◽  
Boris Kaus ◽  
Andrea Piccolo ◽  
Ian Williams ◽  
Axel Gerdes ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Numerical Experiments ◽  
Lithospheric Plate ◽  
Plate Motion ◽  
South American ◽  
Plume Dynamics ◽  
Tectonic Settings ◽  
The Caribbean ◽  
Galapagos Plume ◽  
Stable Domains

Abstract Mantle plumes are active for long periods of time1,2, however dating the onset of their activity is difficult. The magmatic products of the Galápagos plume, for example, have been subducted and fragmentarily accreted to the Caribbean and South American plates3,4. Based on submarine and terrestrial exposures it is inferred that the plume has been operating for ~90 Myrs5 or perhaps even longer (e.g., ~139 Myrs6). Here we show that the activity of the plume dates back to ~170 Ma. Evidence for this comes from 0 to 168 Ma zircon with isotopic plume signature (Galápagos Plume Array; GPA) recovered from lavas and sediments from ten islands of the archipelago. Given lithospheric plate motion, this result implies that GPA zircon predating the Galápagos lithosphere (i.e., >14 Ma) formed at asthenospheric depths. Thermo-mechanical numerical experiments of plume-lithosphere interaction show that old zircon grains can be stored within local astenospheric stable domains to be later captured by subsequent rising plume magmas. These results open new avenues for research on mantle plume dynamics in similar tectonic settings.

Ultramafic-alkaline-carbonatite complexes as a result of two-stage melting of mantle plume: evidence from the mid-paleoproterozoic Tiksheozero intrusion, Northern Karelia, Russia

2019 ◽  
Vol 486 (4) ◽  
pp. 460-465
Author(s):  
E. V. Sharkov ◽  
A. V. Chistyakov ◽  
M. M. Bogina ◽  
O. A. Bogatikov ◽  
V. V. Shchiptsov ◽  
...  
Keyword(s):  
Fractional Crystallization ◽  
Mantle Plume ◽  
Large Igneous Province ◽  
Intrusive Complex ◽  
Incongruent Melting ◽  
Isotopic Data ◽  
Two Stage ◽  
Similar Composition ◽  
Igneous Province ◽  
Alkaline Magmas

Tiksheozero ultramafic-alkaline-carbonatite intrusive complex, like numerous carbonatite-bearing complexes of similar composition, is a part of large igneous province, related to the ascent of thermochemical mantle plume. Our geochemical and isotopic data evidence that ultramafites and alkaline rocks are joined by fractional crystallization, whereas carbonatitic magmas has independent origin. We suggest that origin of parental magmas of the Tiksheozero complex, as well as other ultramafic-alkaline-carbonatite complexes, was provided by two-stage melting of the mantle-plume head: 1) adiabatic melting of its inner part, which produced moderately-alkaline picrites, which fractional crystallization led to appearance of alkaline magmas, and 2) incongruent melting of the upper cooled margin of the plume head under the influence of CO2-rich fluids  that arrived from underlying zone of adiabatic melting gave rise to carbonatite magmas.

scholarly journals Insights into the Galápagos plume from uranium-series isotopes of recently erupted basalts

2011 ◽  
Vol 12 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Heather K. Handley ◽  
Simon Turner ◽  
Kim Berlo ◽  
Christoph Beier ◽  
Alberto E. Saal
Keyword(s):  
Uranium Series ◽  
Galapagos Plume
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