Sedimentary petrology and geochemistry of the siliciclastic rocks from the Isparta Angle area(SW Türkiye):Implications for provenance and tectonic settingsOA

The Antalya Complex within the Isparta Angle(IA)in the southwest of Türkiye includes various rock types formed in different geodynamic settings and contains important data that shed light on the geodynamic evolution of the Eastern Mediterranean region.In this study,source rocks and tectonic settings of ancient sedimentary basins within the IA have been interpreted using geochemical contents of siliciclastic rocks in different ages.In this regard,whole-rock major,trace and rare earth element(REE)analyses have been conducted on the Cenozoic turbiditic sandstones(from the Eocene Isparta Formation and the Miocene Güneyce Formation in the north of the IA)and integrated with the available data of the Trias sic shales from the east and Upper Cretaceous sandstones from the southwest of the IA.The results indicate that Cenozoic sandstone samples are calcium-rich(CaO,30.54-43.87wt%,average 37.63 wt%),comparable to those of Upper Cretaceous sandstones(CaO,average 24.92 wt%)and Late Triassic(CaO,range between 11.27-26.71 wt%)shales.They demonstrate an excellent carbonate dilution effect on the majority of major oxides.In contrast to the Late Trias sic shales with close affinity to Post-Archean Average Archean Shale(PAAS),Cenozoic and Upper Cretaceous ophiolite-related clastic sediments display strike depletions in Nb-Ta,Th,Rb,Zr and Hf and enrichments in Ni,Co and Cr,suggesting mafic and ultramafic rocks in a source region.Notable enrichments of Cr(average 80.5 ppm),V(average 105.5 ppm),Ni(average 42.3 ppm)and Co(average13.9 ppm)in Late Triassic shales can be attributed to the influences of Triassic OIB-like basaltic rift magmatism in their source regions.In general,their igneous source rocks were derived from mixed sources,e.g.,(1)predominantly continental felsic and lesser rift-related basaltic mafic source rocks for Late Triassic shales,(2)mainly ophiolitic maficultramafic and lesser continental felsic source rocks for Upper Cretaceous sandstones and(3)primarily continental felsic and lesser ophiolitic mafic-ultramafic source rocks for Cenozoic sandstones.These inferences also imply that the distinct parent rock compositions of the Late Triassic,Upper Cretaceous and Cenozoic aged siliciclastic rock samples reflect their distinct tectonic settings such as the passive rift setting of Late Triassic shales,an SSZ setting for the Upper Cretaceous sandstones and a collisional setting of the Cenozoic sandstones,respectively.