A deep mantle source for carbonatite magmatism: evidence from the nephelinites and carbonatites of the Buhera district, SE Zimbabwe

1998 ◽  
Vol 158 (3-4) ◽  
pp. 131-142 ◽  
Author(s):  
R.E Harmer ◽  
C.A Lee ◽  
B.M Eglington
Keyword(s):  
Mantle Source ◽  
Deep Mantle

The North America mid-Cretaceous kimberlite corridor: Wet, edge-driven decompression melting of an OIB-type deep mantle source

2017 ◽  
Vol 18 (7) ◽  
pp. 2727-2747 ◽  
Author(s):  
B. A. Kjarsgaard ◽  
L. M. Heaman ◽  
C. Sarkar ◽  
D. G. Pearson
Keyword(s):  
North America ◽  
Mantle Source ◽  
The North ◽  
Deep Mantle

scholarly journals Role of recycled sediments in the origin of an enriched deep mantle source

2019 ◽  
Vol 93 (S1) ◽  
pp. 135-135
Author(s):  
Yanfei Zhang ◽  
Chao Wang ◽  
Zhenmin Jin ◽  
Jide Zhang ◽  
Shuyan Jin
Keyword(s):  
Mantle Source ◽  
Deep Mantle

Corrigendum to “The Fe and Zn isotope composition of deep mantle source regions: Insights from Baffin Island picrites” [Geochim. Cosmochim. Acta 238 (2018) 542–562]

2019 ◽  
Vol 259 ◽  
pp. 414-415
Author(s):  
Alex J. McCoy-West ◽  
J. Godfrey Fitton ◽  
Marie-Laure Pons ◽  
Edward C. Inglis ◽  
Helen M. Williams
Keyword(s):  
Mantle Source ◽  
Isotope Composition ◽  
Baffin Island ◽  
Source Regions ◽  
Deep Mantle

scholarly journals Do mantle plumes preserve the heterogeneous structure of their deep-mantle source?

2016 ◽  
Vol 434 ◽  
pp. 10-17 ◽  
Author(s):  
T.D. Jones ◽  
D.R. Davies ◽  
I.H. Campbell ◽  
C.R. Wilson ◽  
S.C. Kramer
Keyword(s):  
Mantle Source ◽  
Heterogeneous Structure ◽  
Mantle Plumes ◽  
Deep Mantle

scholarly journals The Fe and Zn isotope composition of deep mantle source regions: Insights from Baffin Island picrites

2018 ◽  
Vol 238 ◽  
pp. 542-562 ◽  
Author(s):  
Alex J. McCoy-West ◽  
J. Godfrey Fitton ◽  
Marie-Laure Pons ◽  
Edward C. Inglis ◽  
Helen M. Williams
Keyword(s):  
Mantle Source ◽  
Isotope Composition ◽  
Baffin Island ◽  
Source Regions ◽  
Deep Mantle

scholarly journals Geochemical constraints on the structure of the Earth’s deep mantle and the origin of the LLSVPs

2021 ◽  
Author(s):  
Matthew Gleeson ◽  
Caroline Soderman ◽  
Simon Matthews ◽  
Sanne Cottaar ◽  
Sally Gibson
Keyword(s):  
Mantle Source ◽  
Lower Mantle ◽  
Source Region ◽  
Shear Velocity ◽  
Mantle Plumes ◽  
The North ◽  
Deep Mantle ◽  
The Pacific ◽  
Heterogeneous Mantle ◽  
Low Shear

Geophysical analysis of the Earth’s lower mantle has revealed the presence of two superstructures characterized by low shear wave velocities on the core-mantle boundary. These Large Low Shear Velocity Provinces (LLSVPs) play a crucial role in the dynamics of the lower mantle and act as the source region for deep-seated mantle plumes. However, their origin, and the characteristics of the surrounding deep mantle, remain enigmatic. Mantle plumes located above the margins of the LLSVPs display evidence for the presence of this deep-seated, thermally and/or chemically heterogeneous mantle material ascending into the melting region. As a result, analysis of the spatial geochemical heterogeneity in OIBs provides constraints on the structure of the Earth’s lower mantle and the origin of the LLSVPs. In this study, we focus on the Galápagos Archipelago in the eastern Pacific, where bilateral asymmetry in the radiogenic isotopic composition of erupted basalts has been linked to the presence of LLSVP material in the underlying plume. We show, using spatial variations in the major element contents of high-MgO basalts, that the isotopically enriched south-western region of the Galápagos mantle – assigned to melting of LLSVP material – displays no evidence for lithological heterogeneity in the mantle source. As such, it is unlikely that the Pacific LLSVP represents a pile of subducted oceanic crust. Clear evidence for a lithologically heterogeneous mantle source is, however, found in the north-central Galápagos, indicating that a recycled crustal component is present near the eastern margin of the Pacific LLSVP, consistent with seismic observations.

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