scholarly journals Mantle sources and magma evolution beneath the Cameroon Volcanic Line: Geochemistry of mafic rocks from the Bamenda Mountains (NW Cameroon)

2013 ◽  
Vol 24 (2) ◽  
pp. 727-741 ◽  
Author(s):  
Pierre Kamgang ◽  
Gilles Chazot ◽  
Emmanuel Njonfang ◽  
Nicaise Blaise Tchuimegnie Ngongang ◽  
Félix M. Tchoua
Keyword(s):  
Magma Evolution ◽  
Mafic Rocks ◽  
Cameroon Volcanic Line ◽  
Mantle Sources

Mantle sources beneath the Cameroon Volcanic Line: geochemistry and geochronology of the Bamoun plateau mafic rocks

2016 ◽  
Vol 9 (4) ◽  
Author(s):  
Lise Carole Okomo Atouba ◽  
Gilles Chazot ◽  
Amidou Moundi ◽  
Arnaud Agranier ◽  
Hervé Bellon ◽  
...  
Keyword(s):  
Mafic Rocks ◽  
Cameroon Volcanic Line ◽  
Mantle Sources

scholarly journals The Cameroon Volcanic Line Revisited: Petrogenesis of Continental Basaltic Magmas from Lithospheric and Asthenospheric Mantle Sources

2000 ◽  
Vol 41 (1) ◽  
pp. 87-109 ◽  
Author(s):  
A. MARZOLI ◽  
E. M. PICCIRILLO ◽  
P. R. RENNE ◽  
G. BELLIENI ◽  
M. IACUMIN ◽  
...  
Keyword(s):  
Cameroon Volcanic Line ◽  
Asthenospheric Mantle ◽  
Mantle Sources ◽  
Basaltic Magmas

scholarly journals Emplacement of magmatic Cu-Au-Te(-Ni-PGE) sulfide blebs in alkaline mafic rocks of the Mordor Complex, Northern Territory, Australia

2020 ◽  
Author(s):  
David A. Holwell ◽  
Daryl E. Blanks
Keyword(s):  
Aldan Shield ◽  
Northern Territory ◽  
Igneous Rocks ◽  
Sulfide Liquid ◽  
Alkaline Complex ◽  
Mafic Rocks ◽  
Igneous Complex ◽  
Intimate Association ◽  
Mantle Sources ◽  
Low Degrees

Abstract Magmatic Ni-Cu-PGE sulfide mineralisation is mostly confined to tholeiitic to komatiitic mafic-ultramafic intrusions, yet there have been an increasing number of occurrences recorded in alkaline-ultramafic, post-collisional magmatic systems, particularly in the lower and middle crust that generally display a characteristic Cu-Au-Te enrichment over more conventional Ni-Cu(-PGE) mineralisation. The Mordor Alkaline Igneous Complex, Australia, is a mid-crustal, zoned alkaline complex comprised of a syenite body with an alkaline mafic-ultramafic subcomplex containing dunites, wehrlites and shonkinites. Sulfide mineralisation is present either in thin, PGE-enriched stratiform ‘reefs’ within layered ultramafics in the centre of the subcomplex, or in thicker zones of Cu(-Au-PGE-Te) sulfide hosted by phlogopite-rich shonkinites towards the intrusion margins. This latter style comprises blebs of pyrite, chalcopyrite and minor millerite and PGE tellurides formed from the cooling of a Cu-dominant sulfide liquid. Primary igneous calcite is present in intimate association with the sulfide. We note that the circular nature of the complex, with a dunite core and shonkinite rim with chalcophile element mineralisation, is comparable to the pipe-like, intracratonic, alkaline-ultramafic Aldan Shield intrusions in Russia. As such, Mordor may have an intracratonic rather than post-collisional affinity. Nevertheless, sulfide mineralisation is typical of other alkaline-hosted occurrences, with a Cu-Au-Te-rich signature, low Ni contents and textural association with calcite, supporting models of chalcophile metal and S fluxing alongside carbonate in alkaline systems derived from low degrees of partial melting of hydrous and carbonated mantle sources. Mordor illustrates that alkaline igneous rocks are prospective for magmatic Cu-Au-PGE-Ni sulfide mineralisation, and the classic ‘marginal base metal– and sulfide-rich’ and ‘stratiform PGE-rich and sulfide-poor’ mineralisation styles may both be found in such intrusions.

Kibaran A-type granitoids and mafic rocks generated by two mantle sources in a late orogenic setting (Burundi)

1994 ◽  
Vol 68 (3-4) ◽  
pp. 323-356 ◽  
Author(s):  
L. Tack ◽  
J.P. Liégeois ◽  
A. Deblond ◽  
J.C. Duchesne
Keyword(s):  
Mafic Rocks ◽  
Mantle Sources

Nd–Sr–Pb isotopic composition and mantle sources of Triassic rift units in the Serbo-Macedonian and the western Rhodope massifs (Bulgaria–Greece)

2011 ◽  
Vol 149 (1) ◽  
pp. 146-152 ◽  
Author(s):  
NIKOLAY BONEV ◽  
YILDIRIM DILEK ◽  
JOHN M. HANCHAR ◽  
KAMEN BOGDANOV ◽  
LASLO KLAIN
Keyword(s):  
Isotopic Composition ◽  
Continental Rift ◽  
Pb Isotopes ◽  
Crustal Material ◽  
Field Observations ◽  
Mafic Rocks ◽  
Aegean Region ◽  
Basaltic Rocks ◽  
Mantle Sources ◽  
Pb Isotopic Composition

AbstractWe report on the field occurrence and isotopic compositions of metamafic rocks exposed in the Serbo-Macedonian (Volvi and Therma bodies) and western Rhodope (Rila Mountains) massifs of Bulgaria and Greece. These metamafic units consist of high- and low-Ti gabbroic and basaltic rocks, whose Nd–Sr–Pb isotopes are compatible with mantle-derived MORB and OIB components with a small amount of crustal material involved in their melt source. These isotopic features combined with the field observations are consistent with an intra-continental rift origin of the metamafic rocks protolith, and are comparable to those of the Triassic rift-related mafic rocks in the northern Aegean region.

scholarly journals Mantle sources and magma evolution in Europe's largest rare earth element belt (Gardar Province, SW Greenland): New insights from sulfur isotopes

2021 ◽  
Vol 568 ◽  
pp. 117034
Author(s):  
William Hutchison ◽  
Adrian A. Finch ◽  
Anouk M. Borst ◽  
Michael A.W. Marks ◽  
Brian G.J. Upton ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Sulfur Isotopes ◽  
Magma Evolution ◽  
Mantle Sources
Sign in / Sign up

Export Citation Format

Share Document