scholarly journals Re-Os isotope systematics of oxide xenocrysts and peridotite xenoliths from the kimberlites and the Argyle lamproite, Kimberley Block, Australia: implications for the evolution of the continental lithospheric mantle

2019 ◽  
Keyword(s):  
Lithospheric Mantle ◽  
Peridotite Xenoliths ◽  
Continental Lithospheric Mantle ◽  
Isotope Systematics ◽  
Os Isotope

Sub-continental lithospheric mantle deformation in the Yerer-Tullu Wellel Volcanotectonic Lineament: A study of peridotite xenoliths

2017 ◽  
Vol 455 ◽  
pp. 249-263 ◽  
Author(s):  
Kaitlyn R. Trestrail ◽  
Tyrone O. Rooney ◽  
Guillaume Girard ◽  
Chris Svoboda ◽  
Gezahegn Yirgu ◽  
...  
Keyword(s):  
Lithospheric Mantle ◽  
Peridotite Xenoliths ◽  
Continental Lithospheric Mantle

scholarly journals Re-Os Isotope Systematics of Sulfides in Chromitites and Host Lherzolites of the Andaman Ophiolite, India

Minerals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 686 ◽  
Author(s):  
José González-Jiménez ◽  
Sisir Mondal ◽  
Biswajit Ghosh ◽  
William Griffin ◽  
Suzanne O’Reilly
Keyword(s):  
Lithospheric Mantle ◽  
South India ◽  
Subcontinental Lithospheric Mantle ◽  
Volcanic Arc ◽  
Crustal Rocks ◽  
Isotopic Heterogeneity ◽  
Icp Ms ◽  
Subduction System ◽  
Isotope Systematics ◽  
Os Isotope

Laser ablation MC-ICP-MS was used to measure the Os-isotope compositions of single sulfide grains, including laurite (RuS2) and pentlandite [(Fe,Ni)9S8], from two chromitite bodies and host lherzolites from ophiolites of North Andaman (Indo-Burma-Sumatra subduction zone). The results show isotopic heterogeneity in both laurite (n = 24) and pentlandite (n = 37), similar to that observed in other chromitites and peridotites from the mantle sections of ophiolites. Rhenium-depletion model ages (TRD) of laurite and pentlandite reveal episodes of mantle magmatism and/or metasomatism in the Andaman mantle predating the formation of the ophiolite (and the host chromitites), mainly at ≈0.5, 1.2, 1.8, 2.1 and 2.5 Ga. These ages match well with the main tectonothermal events that are documented in the continental crustal rocks of South India, suggesting that the Andaman mantle (or its protolith) had a volume of lithospheric mantle once underlaying this southern Indian continental crust. As observed in other oceanic lithospheres, blocks of ancient subcontinental lithospheric mantle (SCLM) could have contributed to the development of the subduction-related Andaman–Java volcanic arc. Major- and trace-element compositions of chromite indicate crystallization from melts akin to high-Mg IAT and boninites during the initial stages of development of this intra-oceanic subduction system.

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