scholarly journals An Overview of the Geochemical Characteristics of Oceanic Carbonatites: New Insights from Fuerteventura Carbonatites (Canary Islands)

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 203
Author(s):  
Gabriele Carnevale ◽  
Antonio Caracausi ◽  
Alessandra Correale ◽  
Laura Italiano ◽  
Silvio G. Rotolo
Keyword(s):  
Trace Elements ◽  
Canary Islands ◽  
Lithospheric Mantle ◽  
Noble Gases ◽  
Cape Verde ◽  
Geochemical Characteristics ◽  
Isotopic Ratios ◽  
Isotopic Study ◽  
Continental Lithospheric Mantle

The occurrence of carbonatites in oceanic settings is very rare if compared with their continental counterpart, having been reported only in Cape Verde and Canary Islands. This paper provides an overview of the main geochemical characteristics of oceanic carbonatites, around which many debates still exist regarding their petrogenesis. We present new data on trace elements in minerals and whole-rock, together with the first noble gases isotopic study (He, Ne, Ar) in apatite, calcite, and clinopyroxene from Fuerteventura carbonatites (Canary Islands). Trace elements show a similar trend as Cape Verde carbonatites, almost tracing the same patterns on multi-element and REE abundance diagrams. 3He/4He isotopic ratios of Fuerteventura carbonatites reflect a shallow (sub-continental lithospheric mantle, SCLM) He signature in their petrogenesis, and they clearly differ from Cape Verde carbonatites, i.e., fluids from a deep and low degassed mantle with a primitive plume-derived He signature are involved in their petrogenesis.

Geochemistry of late Caledonian minettes from Northern Britain: implications for the Caledonian sub-continental lithospheric mantle

1996 ◽  
Vol 60 (398) ◽  
pp. 221-236 ◽  
Author(s):  
Jason C. Canning ◽  
P. J. Henney ◽  
M. A. Morrison ◽  
J. W. Gaskarth
Keyword(s):  
Trace Elements ◽  
Partial Melting ◽  
Fractional Crystallization ◽  
Lithospheric Mantle ◽  
Sr Isotope ◽  
Crustal Assimilation ◽  
Continental Lithospheric Mantle ◽  
Compositional Changes ◽  
Tectonic Dislocations

AbstractThe geochemistry of late Caledonian minettes from across the orogenic belt is compared in order to constrain the composition of the Caledonian sub-continental lithospheric mantle (SCLM). All the minettes are similar petrographically and chemically and several samples have characteristics typical of near primary mantle melts. Samples from the Northern Highlands and the Caledonian foreland show enrichment in many trace elements (notably LILE and LREE) relative to those from the Grampians, the Southern Uplands and northern England, coupled with distinct Nd and Sr isotope characteristics. Processes such as fractional crystallization, crustal assimilation, and partial melting played a negligible role in creating the differences between the two groups which reflect long-term, time-integrated differences in the compositions of their SCLM sources. The Great Glen Fault appears to represent the boundary between these two lithospheric mantle domains. Other currently exposed Caledonian tectonic dislocations cannot be correlated directly with compositional changes within the SCLM. The chemical provinciality displayed by the minettes shows some resemblance to that within other late Caledonian igneous suites, including the newer granites, suggesting that the minettes may represent the lithospheric mantle contributions to these rocks.

scholarly journals Petrogenesis of Quaternary Shoshonitic Volcanism in NE Iran (Ardabil): Implication for Postcollisional Magmatism

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Habib Shahbazi Shiran
Keyword(s):  
Trace Elements ◽  
Rare Earth ◽  
Mantle Source ◽  
Lithospheric Mantle ◽  
Volcanic Rocks ◽  
Enriched Mantle ◽  
Low Degree ◽  
Continental Lithospheric Mantle ◽  
Ne Iran ◽  
Postcollisional Magmatism

Trachyandesites, trachytes, andesites, and pyrocalstic rocks, with shoshonitic signature, are the main Quaternary volcanic rocks in the Sabalan region (Ardabil). Plagiocalse, K-feldspar, biotite associated with clinopyroxene, and glass are the main constituents of these lavas. Plagioclases are andesine to labradorite while clinopyroxenes have augitic composition. The Sabalan volcanic rocks show enrichment in LREEs (relative to HREEs) and are characterized by enrichment in LILEs and depletion in HFSEs. Petrological observations, along with rare earth and trace elements geochemistry, suggest shoshonitic signature for Sabalan lavas. This signature highlights derivation from a subduction-related source. The Sabalan volcanic rocks are isotopically characterized by derivation from an enriched mantle source with a tendency to plot in the fields defined by island-arc basalts (IAB) and OIBs (in εNd versus 87Sr/86Sr diagram). The geochemical and isotopic characteristics of the Sabalan lavas suggest that their magma has been issued via low degree partial melting of a subduction-metasomatized continental lithospheric mantle. The formation of these lavas is related to slab steepening and breakoff in a postcollisional regime.

scholarly journals Modes of Occurrences and Geochemical Characteristics of Ilmenite and Magnetite of the North Suoi Cun Lherzolite and Gabbroid

2017 ◽  
Vol 33 (4) ◽  
Author(s):  
Tran Trong Hoa ◽  
Tatiana Svetliskaya ◽  
Andrey Izokh ◽  
Petr Nevolko ◽  
Tran Tuan Anh ◽  
...  
Keyword(s):  
Magma Chamber ◽  
Lithospheric Mantle ◽  
Sulfide Minerals ◽  
Geochemical Characteristics ◽  
Ultramafic Rocks ◽  
The North ◽  
Original Magma ◽  
Formation And Evolution ◽  
Continental Lithospheric Mantle

Modes of occurrences and geochemical characteristics of ilmenite and magnetite in the North Suoi Cun ultramafic rocks are studied to understand source, formation and evolution of magma chamber.  The North Suoi Cun ultramafic block consist of plagiolherzolite and olivine melano-gabbro.  The Plagiolherzolite and olivine melano-gabbro consist of large amounts of olivine and pyroxene, lesser amounts of plagioclase and sulfide minerals and small amounts of biotite, chromspinel, ilmenite and magnetite. The results suggest that: a/ There are two types of ilmenite, that were formed in two distinct stages: Early Mg-rich ilmenite was formed at intermediate magma chamber and latter Mn-rich ilmenite was formed at crystallized magma chamber; b/ Original magma of Suoi Cun plagiolherzolite and melano gabbroid was derived from sub-continental lithospheric mantle; c/ magnetite was formed at latter stage by two processes: serpentinization and alteration of early sulfide minerals.

The travels of Carl Bolle to the Cape Verde and the Canary Islands

1991 ◽  
Vol 18 (2) ◽  
pp. 251-254
Author(s):  
SUSANNE SALINGER ◽  
HARRO STREHLOW
Keyword(s):  
Canary Islands ◽  
Cape Verde
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