Refertilization of Mantle Peridotites from the Central Indian Ridge: Response to a Geodynamic Transition

Autor:	M. Kotha, Abhishek Saha, Manavalan Satyanarayanan, Sohini Ganguly, A. Verencar, Arghya Hazra
Rok vydání:	2021
Předmět:	Ridge (meteorology) Geochemistry Geology Mantle (geology)
Zdroj:	Lithosphere. 2021
ISSN:	1947-4253 1941-8264
DOI:	10.2113/2021/9706924
Popis:	The phenomena of reactive percolation of enriched asthenospheric melts and pervasive melt-rock interactions at mid oceanic ridge-rift systems are the principal proponents for mantle refertilization and compositional heterogeneity. This study presents new mineralogical and geochemical data for the abyssal peridotites exposed along the Vema and Vityaz fracture zones of the Central Indian Ridge (CIR) to address factors contributing to the chemical heterogeneity of CIR mantle. Cr-spinel (Cr#: 0.37-0.59) chemistry classifies these rocks as alpine-type peridotites and corroborates a transitional depleted MORB type to enriched, SSZ-related arc-type magma composition. HFSE and REE geochemistry further attests to an enriched intraoceanic forearc mantle affinity. The distinct boninitic signature of these rocks reflected by LREE>MREE
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c7de607d50d6ca0543b48412455b51a1 https://doi.org/10.2113/2021/9706924 Zobrazit plný text záznamu