Geodynamic significance and genesis of chromitites from the Islahiye ophiolite(Gaziantep,SE Anatolia)as constrained by platinum group element(PGE)compositions and mineral chemistry characteristics

作     者：Nil Yapici Gael Calo sinda Ngbangandimbo Nusret Nurlu Nil Yapici;Gael Calo sinda Ngbangandimbo;Nusret Nurlu

作者机构：Department of Mining EngineeringUniversity ofÇukurovaAdanaTurkey Department of Geological EngineeringUniversity ofÇukurovaAdanaTurkey Mühendislik FakültesiJeoloji Mühendisliği BölümüÇukurovaÜniversitesi01330 BalcalıAdanaTurkey 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2022年第41卷第5期

页      面：741-752页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 0806[工学-冶金工程] 

基　　金：Cukurova University Research Foundation for their support(Project No:FYL-2018-10437 FBA-2021-13093) 

主　　题：Chromite Platinum group element Platinum group mineral Ophiolite Mineral chemistry 

摘      要：Chromitites associated with intensely altered dunites and harzburgites from fourteen dif ferent localities in the Islahiye ophiolites(SE Anatolia)is reported here for the first *** chromitites were observed as lenticular and banded bodies with disseminated and massive textures and containing magnesiochromite grains with the following composition:CrO=58.91–59.74 wt%,Al_(2)O_(3)=10.85–11.20 wt%,and TiO=0.09–0.13 wt%.The Mg#[Mg/(Mg+Fe)]values of magnesiochromite from the Islahiye ophiolite range between 0.52 and 0.60 and their Cr#[Cr/(Cr+Al)]values vary from 0.7802 to *** contents vary with a constant pattern,coincident with the estimated parental liquids that have originated from the derivative of a single bulk of boninitic magma together with Al,Ti-poor,and Cr-rich initial *** chromitites are serpentinised in almost all parts of the study area,and harzburgite and dunite can be observed in different *** the overall composition of platinum group elements(PGE)in most examined chromitites varies between 97 and 191 ppb,three chromitites from the Islahiye region present enrichments in overall PGE(up to 214 ppb).The mineralogical and geochemical features of chromitites from the Islahiye region exhibit a robust similarity to podiform chromitites in the mantle fragment of supra–subduction zone type ophiolitic *** estimated parental magmas of the investigated chromites are consistent with the diff erentiation of arcrelated melts and do not suggest an oceanic spreading centre tectonic *** Islahiye chromites are enriched in IPGE(Ir,Os,Ru),with the occasional presence of Ru and Ir and higher Os contents in ***,we did not find any platinum group minerals(PGM)associated with the serpentine silicate sample matrix,which would have stated a secondary enrichment in *** chromitites in the investigated region have high Cr and low Ti values,are defined as magnesiochromite and were crystallised from a characte