Deep mantle origin and ultra-reducing conditions in podiform chromitite: Diamond, moissanite, and other unusual minerals in podiform chromitites from the Pozanti-Karsanti ophiolite, southern Turkey

2017 ◽  
Keyword(s):  
Mantle Origin ◽  
Deep Mantle ◽  
Reducing Conditions ◽  
Southern Turkey ◽  
Podiform Chromitites ◽  
Podiform Chromitite

scholarly journals Diamond and Other Exotic Mineral-Bearing Ophiolites on the Globe: A Key to Understand the Discovery of New Minerals and Formation of Ophiolitic Podiform Chromitite

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1362
Author(s):  
Fei Liu ◽  
Dongyang Lian ◽  
Weiwei Wu ◽  
Jingsui Yang
Keyword(s):  
Mineral Inclusion ◽  
Carbon And Nitrogen ◽  
Crustal Recycling ◽  
Suprasubduction Zone ◽  
Deep Mantle ◽  
Mid Ocean Ridge ◽  
Deep Earth ◽  
Podiform Chromitites ◽  
Ocean Ridge ◽  
Podiform Chromitite

Ophiolite-hosted diamond from peridotites and podiform chromitites significantly differs from those of kimberlitic diamond and ultra-high pressure (UHP) metamorphic diamond in terms of occurrence, mineral inclusion, as well as carbon and nitrogen isotopic composition. In this review, we briefly summarize the global distribution of twenty-five diamond-bearing ophiolites in different suture zones and outline the bulk-rock compositions, mineral and particular Re-Os isotopic systematics of these ophiolitic chromitites and host peridotites. These data indicate that the subcontinental lithospheric mantle is likely involved in the formation of podiform chromitite. We also provide an overview of the UHP textures and unusual mineral assemblages, including diamonds, other UHP minerals (e.g., moissanite, coesite) and crustal minerals, which robustly offer evidence of crustal recycling in the deep mantle along the suprasubduction zone (SSZ) and then being transported to shallow mantle depths by asthenospheric mantle upwelling in mid-ocean-ridge and SSZ settings. A systematic comparison between four main genetic models provides insights into our understanding of the origin of ophiolite-hosted diamond and the formation of podiform chromitite. Diamond-bearing peridotites and chromitites in ophiolites are important objects to discover new minerals from the deep earth and provide clues on the chemical composition and the physical condition of the deep mantle.

Opx–Cpx exsolution textures in lherzolites of the Cretaceous Purang Ophiolite (S. Tibet, China), and the deep mantle origin of Neotethyan abyssal peridotites

2019 ◽  
Vol 62 (6) ◽  
pp. 665-682 ◽  
Author(s):  
Fahui Xiong ◽  
Yildirim Dilek ◽  
Richard Wirth ◽  
Xiangzhen Xu ◽  
Jingsui Yang
Keyword(s):  
Mantle Origin ◽  
Deep Mantle

A deep mantle origin for the primitive signature of ocean island basalt

2011 ◽  
Vol 4 (12) ◽  
pp. 879-882 ◽  
Author(s):  
Frédéric Deschamps ◽  
Edouard Kaminski ◽  
Paul J. Tackley
Keyword(s):  
Ocean Island Basalt ◽  
Ocean Island ◽  
Mantle Origin ◽  
Deep Mantle ◽  
Island Basalt

On the deep-mantle origin of the Deccan Traps

Science ◽  
2017 ◽  
Vol 355 (6325) ◽  
pp. 613-616 ◽  
Author(s):  
Petar Glišović ◽  
Alessandro M. Forte
Keyword(s):  
Deccan Traps ◽  
Mantle Origin ◽  
Deep Mantle

Evidence for a Deep-Mantle Origin of a NaPX-EN Inclusion in Diamond

2000 ◽  
Vol 42 (11) ◽  
pp. 1000-1006 ◽  
Author(s):  
Wuyi Wang ◽  
Tibor Gasparik
Keyword(s):  
Mantle Origin ◽  
Deep Mantle

Deep mantle origin of kimberlite magmas revealed by neon isotopes

2006 ◽  
Vol 33 (16) ◽  
Author(s):  
Hirochika Sumino ◽  
Ichiro Kaneoka ◽  
Kyosuke Matsufuji ◽  
Alexander V. Sobolev
Keyword(s):  
Mantle Origin ◽  
Deep Mantle

Deep mantle origin of kimberlite magmas revealed by neon isotopes

2006 ◽  
Vol 70 (18) ◽  
pp. A624
Author(s):  
H. Sumino ◽  
I. Kaneoka ◽  
K. Matsufuji ◽  
A.V. Sobolev
Keyword(s):  
Mantle Origin ◽  
Deep Mantle

Hafnium isotope evidence from Archean granitic rocks for deep-mantle origin of continental crust

2012 ◽  
Vol 337-338 ◽  
pp. 211-223 ◽  
Author(s):  
Martin Guitreau ◽  
Janne Blichert-Toft ◽  
Hervé Martin ◽  
Stephen J. Mojzsis ◽  
Francis Albarède
Keyword(s):  
Continental Crust ◽  
Granitic Rocks ◽  
Mantle Origin ◽  
Deep Mantle ◽  
Isotope Evidence

Low-T formation of high-Cr spinel with apparently primary chemical characteristics within podiform chromitite from Rayat, northeastern Iraq

2006 ◽  
Vol 70 (5) ◽  
pp. 499-508 ◽  
Author(s):  
S. Arai ◽  
Y. Shimizu ◽  
S. A. Ismail ◽  
A. H. Ahmed
Keyword(s):  
Chemical Properties ◽  
Chromian Spinel ◽  
Chemical Characteristics ◽  
Silicate Matrix ◽  
Mantle Origin ◽  
Ophiolitic Mélange ◽  
Magnesian Olivine ◽  
The Matrix ◽  
Detrital Particles ◽  
Podiform Chromitite

AbstractChemical modification of chromian spinel at low-T alteration was examined in detail for a podiform chromitite from a Tethyan ophiolitic mélange belt at Rayat, northeastern Iraq. The chromitite is highly brecciated and the matrix has been completely altered, producing chlorite and carbonate (dolomite and calcite). High-Cr, low-Fe3+ spinel has formed along the margins and cracks of chromian spinel grains throughout the alteration, associated with unaltered primary spinel and magnetite without ferritchromite. In associated harzburgites, only ferritchromite is found instead of the high-Cr, low-Fe3+ spinel. The high-Cr, low-Fe3+ secondary spinel apparently has chemical properties of mantle origin, plotted at the extension of ordinary mantle spinels on compositional spaces. The character is due to subtraction of Al as chlorite with the addition of an amount of magnetite component from the silicate matrix, which is small in volume relative to peridotite and composed of highly magnesian olivine (up to Fo97). We should treat high-Cr chromian spinels with caution in highly altered mantle-derived rocks, especially chromitite and other rocks with highly magnesian olivine, as well as in detrital particles for provenance study.

Sign in / Sign up

Export Citation Format

Share Document