Role of the deep mantle in generating the compositional asymmetry of the Hawaiian mantle plume

2011 ◽  
Vol 4 (12) ◽  
pp. 831-838 ◽  
Author(s):  
Dominique Weis ◽  
Michael O. Garcia ◽  
J. Michael Rhodes ◽  
Mark Jellinek ◽  
James S. Scoates
Keyword(s):  
Mantle Plume ◽  
Deep Mantle

THE ROLE OF DEEP MANTLE FLOW IN SHAPING THE HAWAIIAN-EMPEROR BEND

2017 ◽  
Author(s):  
Simon Williams ◽  
◽  
Rakib Hassan ◽  
Dietmar Müller ◽  
Michael Gurnis ◽  
...  
Keyword(s):  
Mantle Flow ◽  
Deep Mantle

scholarly journals Noble gases confirm plume-related mantle degassing beneath Southern Africa

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
S. M. V. Gilfillan ◽  
D. Györe ◽  
S. Flude ◽  
G. Johnson ◽  
C. E. Bond ◽  
...  
Keyword(s):  
Heat Flow ◽  
Mantle Plume ◽  
Southern Africa ◽  
Upper Mantle ◽  
Thermal Anomaly ◽  
Continental Lithosphere ◽  
Thermal Perturbation ◽  
Deep Mantle ◽  
Kwazulu Natal ◽  
Isotope Systematics

Abstract Southern Africa is characterised by unusually elevated topography and abnormal heat flow. This can be explained by thermal perturbation of the mantle, but the origin of this is unclear. Geophysics has not detected a thermal anomaly in the upper mantle and there is no geochemical evidence of an asthenosphere mantle contribution to the Cenozoic volcanic record of the region. Here we show that natural CO2 seeps along the Ntlakwe-Bongwan fault within KwaZulu-Natal, South Africa, have C-He isotope systematics that support an origin from degassing mantle melts. Neon isotopes indicate that the melts originate from a deep mantle source that is similar to the mantle plume beneath Réunion, rather than the convecting upper mantle or sub-continental lithosphere. This confirms the existence of the Quathlamba mantle plume and importantly provides the first evidence in support of upwelling deep mantle beneath Southern Africa, helping to explain the regions elevation and abnormal heat flow.

scholarly journals The role of a mantle plume in the formation of Yellowstone volcanism

2016 ◽  
Vol 43 (3) ◽  
pp. 1132-1139 ◽  
Author(s):  
Tiffany Leonard ◽  
Lijun Liu
Keyword(s):  
Mantle Plume

WINDOWS INTO THE DEEP MANTLE FROM LONG-LASTING EM-1 MANTLE PLUME

2017 ◽  
Author(s):  
Dominique Weis ◽  
◽  
Lauren Harrison ◽  
James S. Scoates
Keyword(s):  
Mantle Plume ◽  
Deep Mantle

Noble gas isotopes suggest deep mantle plume source of late Cenozoic mafic alkaline volcanism in Europe

2005 ◽  
Vol 230 (1-2) ◽  
pp. 143-162 ◽  
Author(s):  
Alexei Buikin ◽  
Mario Trieloff ◽  
Jens Hopp ◽  
Tilmann Althaus ◽  
Ekaterina Korochantseva ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Noble Gas ◽  
Late Cenozoic ◽  
Deep Mantle ◽  
Alkaline Volcanism ◽  
Noble Gas Isotopes ◽  
Gas Isotopes

scholarly journals Genesis of high-Ni olivine phenocrysts of the Dali picrites in the Central Emeishan large igneous province

2020 ◽  
pp. 1-10
Author(s):  
Wen-Chang Cai ◽  
Zhao-Chong Zhang ◽  
Jiang Zhu ◽  
M. Santosh ◽  
Rong-Hao Pan
Keyword(s):  
High Temperatures ◽  
Mantle Plume ◽  
Potential Temperature ◽  
Large Igneous Province ◽  
Thermal Plume ◽  
Emeishan Large Igneous Province ◽  
Igneous Province ◽  
High Concentrations ◽  
Mantle Potential Temperature

Abstract The Emeishan large igneous province (ELIP) in SW China is considered to be a typical mantle-plume-derived LIP. The picrites formed at relatively high temperatures in the ELIP, providing one of the important lines of argument for the role of mantle plume. Here we report trace-element data on olivine phenocrysts in the Dali picrites from the ELIP. The olivines are Ni-rich, and characterized by high (>1.4) 100×Mn/Fe value and low (<13) 10 000×Zn/Fe value, indicating a peridotite-dominated source. Since the olivine–melt Ni partition coefficient (KDNiol/melt) will decrease at high temperatures and pressures, the picrites derived from peridotite melting at high pressure, and that crystallized olivines at lower pressure, can generate high concentrations of Ni in olivine phenocrysts, excluding the necessity of a metasomatic pyroxenite contribution. Based on the Al-in-olivine thermometer, olivine crystallization temperature and mantle potential temperature (TP) were calculated at c. 1491°C and c. 1559°C, respectively. Our results are c. 200°C higher than that of the normal asthenospheric mantle, and are consistent with the role of a mantle thermal plume for the ELIP.

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