Entries by Gelu Costin

J Petrol: Non-sequential injection of PGE-rich ultramafic sills in the Platreef Unit at Akanani, Northern Limb of the Bushveld Complex: Evidence from Sr and Nd isotopic systematics

Roger N Scoon, Gelu Costin, Andrew Mitchell, Bertrand Moine Abstract The Platreef Unit is a deceptively complex sequence of layered cumulates located in the northern limb of the 2.055 Ga-old Bushveld Complex. The unit includes the Platreef, a thick, richly mineralized stratabound PGE orebody which differs markedly from the comparatively thin, predominantly stratiform Merensky Reef found in the […]

Scientific Reports: Monomineralic anorthosites in layered intrusions are indicators of the magma chamber replenishment by plagioclase-only-saturated melts

Rais Latypov, Sofya Chistyakova, Gelu Costin, Olivier Namur, Steve Barnes & Willem Kruger Abstract The formation of some Earth’s monomineralic igneous rocks appears to be prohibited by constraints imposed by liquidus phase-equilibria on the evolution of mantle-derived magmas. Yet, these rocks exist as stratiform layers in many mafic-ultramafic intrusions. One conspicuous example is monomineralic anorthosites […]

CMP: Bushveld symplectic and sieve textured chromite is a result of coupled dissolution reprecipitation: a comparison with xenocrystic chromite reactions in arc basalt

Marina A. Yudovskaya, Gelu Costin, Vladimir Shilovskikh, Ilya Chaplygin, Matthew McCreesh, Judith Kinnaird Abstract Textures of Bushveld chromite from thin seams and accessory disseminations in the Platreef and the northernmost Waterberg Project area were compared with textures of xenocrystic chromite from mantle xenoliths found in Neogene basalt in the Kurile Island Arc. The sieve-textured to symplectic rims around the resorbed chromite in […]

RevPalBot: Sedimentary organic matter characterization of the Whitehill shales (Karoo Basin, South Africa): An integrated quantitative approach using FE-EPMA and LA-ICP-MS

Sedimentary organic matter characterization of the Whitehill shales (Karoo Basin, South Africa): An integrated quantitative approach using FE-EPMA and LA-ICP-MS Gelu Costin, Annette E. Götz, Katrin Ruckwied Permian black shales of South Africa’s Karoo Basin have been classified as potential unconventional gas resources, the Whitehill Formation of the southern basin parts being the main target […]

Contrib Mineral Petrol: Subduction relics in the subcontinental lithospheric mantle: evidence from variation in the δ18O value of eclogite xenoliths from the Kaapvaal Craton

Subduction relics in the subcontinental lithospheric mantle: evidence from variation in the δ18O value of eclogite xenoliths from the Kaapvaal Craton Ioana-Bogdana Radu, Chris Harris, Bertrand N. Moine, Gelu Costin & Jean-Yves Cottin Mantle eclogites are commonly accepted as evidence for ancient altered subducted oceanic crust preserved in the subcontinental lithospheric mantle (SCLM), yet the […]

Mineralogy and Petrology: Clinopyroxene megacrysts from Marion Island, Antarctic Ocean: evidence for a late stage shallow origin

Clinopyroxene megacrysts from Marion Island, Antarctic Ocean: evidence for a late stage shallow origin James Roberts, Keabetswe D. Lehong, Andries E. J. Botha, Gelu Costin, Frikkie C. De Beer, Willem J. Hoffman and Callum J. Hetherington Clinopyroxene megacrysts (up to 5 cm) from a scoria cone on Marion Island, Antarctic Ocean are zoned, with compositionally distinct low (Al + Ti) and high (Al + Ti) patches arranged haphazardly throughout crystals. […]

Nature Communications: Nb/Ta systematics in arc magma differentiation and the role of arclogites in continent formation

Nb/Ta systematics in arc magma differentiation and the role of arclogites in continent formation Ming Tang, Cin-Ty A. Lee, Kang Chen, Monica Erdman, Gelu Costin and Hehe Jiang The surfaces of rocky planets are mostly covered by basaltic crust, but Earth is unique in that it also has extensive regions of felsic crust, manifested in […]

SEG Special Publications, Chapter 9: Anhydrite assimilation by ultramafic melts of the Bushveld Complex, and its consequences to petrology and mineralization

Anhydrite assimilation by ultramafic melts of the Bushveld Complex, and its consequences to petrology and mineralization Yudovskaya, M.A., Sluzhenikin, S.F., Costin, G., Shatagin, K.N., Dubinina, E.O., Grobler, D.F., Ueckermann, H., and Kinnaird1, J.A. in “Metals, Minerals and Society”, Special Publication no. 21, Society of Economic Geologists, Chapter 9,  pp. 177-206 Abstract Sulfate assimilation by mafic to ultramafic […]

Chemistry of Materials: A non-van der Waals 2D Material from natural titanium mineral ore Ilmenite

A non-van der Waals 2D Material from natural titanium mineral ore Ilmenite Puthirath Balan, A., Radhakrishnan, S., Kumar, R., Neupane, R., Sinha, S.K., Deng, L., de los Reyes, C.A., Apte, A., Rao, B.M., Paulose, M., Vajtai, R., Chu, C.W., Costin, G., Marti, A.A., Varghese, O.K., Singh, A.K., Tiwary, C.S., Anantharaman, M.R., Ajayan, P.M Chemistry of […]