An eclogitic component in the Pitcairn mantle plume: evidence from olivine compositions and Fe isotopes of basalts

2021 ◽  
Author(s):  
Jin-Hua Shi ◽  
Gang Zeng ◽  
Li-Hui Chen ◽  
Takeshi Hanyu ◽  
Xiao-Jun Wang ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Fe Isotopes

Reconciling petrological and isotopic mixing mechanisms in the Pitcairn mantle plume using stable Fe isotopes

2019 ◽  
Vol 521 ◽  
pp. 60-67 ◽  
Author(s):  
Oliver Nebel ◽  
Paolo A. Sossi ◽  
Antoine Bénard ◽  
Richard J. Arculus ◽  
Gregory M. Yaxley ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Fe Isotopes ◽  
Isotopic Mixing

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.

FRONTIERS IN THE ANALYSIS AND INTERPRETATION OF ZONED GARNET CRYSTALS: FE-ISOTOPES AS A RECORDER OF REDOX FLUID PROCESSES

2019 ◽  
Author(s):  
Ethan F. Baxter ◽  
◽  
Anna R. Gerrits ◽  
Edward Inglis ◽  
Besim Dragovic ◽  
...  
Keyword(s):  
Fe Isotopes

New potential pyrrhotite and pentlandite reference materials for sulfur and iron isotope microanalysis

2021 ◽  
Author(s):  
Lei Chen ◽  
Yu Liu ◽  
Yang Li ◽  
Qiuli Li ◽  
Xian-Hua Li
Keyword(s):  
Reference Materials ◽  
Sulfide Minerals ◽  
Ore Deposits ◽  
Iron Isotope ◽  
S Isotopes ◽  
Fe Isotopes

Pyrrhotite and pentlandite are the most common Fe sulfide minerals in magmatic ore deposits and meteorites. Multiple S isotopes pairing with Fe isotopes of bulk Fe sulfides have proven to...

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