Geochemical differences between the Harşit Stream channel and terrace sediments (NE Turkey): Implications for mixed source rocks, weathering and mass transfer
- 19 April 2020
- journal article
- Published by Yerbilimleri in Yerbilimleri/Hacettepe Üniversitesi Yerbilimleri Uygulama ve Araştırma Merkezi Dergisi
Abstract
There are minor geochemical differences between Harşit Stream bed and terrace sediments, and these can be owing to the impacts of climatic differences and chemical weathering rather than source rock composition. The bed sediments have lower average SiO2, Al2O3, Fe2O3, K2O, TiO2 and MnO concentrations than terrace sediments, but higher concentrations of MgO, CaO and Na2O. The rare earth element (REE) distributions, Eu/Eu*, (Gd/Yb)N, La/Th and (La/Yb)N ratios of the bed and terrace sediments indicate that they derived from a mixture of 3% granodiorite + 50% gabbro + 47% felsic tuff and 5 % granodiorite + 37% gabbro + 58% felsic tuff, respectively. The CIA, PIA, WIP values and ICV, Rb/Sr ratios indicate that the bed sediments are lowly weathered and terrace sediments are lowly to moderately weathered. The distribution of C-values and Sr/Cu ratios indicate an arid to semiarid climatic conditions for the bed sediments and an arid to semi-moist climatic conditions for terrace sediments. During weathering of the mixed source rocks, Na indicates the greatest loss for the bed and the terrace sediments, and P shows the lowest loss for both of sediments. The average of Si, Al, Na, K and Mn exhibits more loss in bed sediments than terrace sediments, the Fe, Mg, Ca and P exhibits less loss in bed sediments than terrace sediments.Keywords
This publication has 64 references indexed in Scilit:
- Geochemistry of surface sediments from the northwestern Gulf of Mexico: implications for provenance and heavy metal contaminationGeological Quarterly, 2019
- Provenance discrimination between Atasta and Alvarado beach sands, western Gulf of Mexico, Mexico: Constraints from detrital zircon chemistry and U–Pb geochronologyGeological Journal, 2018
- Mineralogy and geochemistry of sands along the Manzanillo and El Carrizal beach areas, southern Mexico: implications for palaeoweathering, provenance and tectonic settingGeological Journal, 2016
- A combined Y/Ho, high field strength element (HFSE) and Nd isotope perspective on basalt weathering, Deccan Traps, IndiaChemical Geology, 2014
- Trace and rare earth element geochemistry of Jurassic mudstones in the northern Qaidam Basin, northwest ChinaGeochemistry, 2012
- Chapter 7. FELDSPAR DISSOLUTION KINETICSPublished by Walter de Gruyter GmbH ,1995
- The interpretation of granitic textures from serial thin sectioning, image analysis and three-dimensional reconstructionMineralogical Magazine, 1995
- Constitutive mass balance relations between chemical composition, volume, density, porosity, and strain in metasomatic hydrochemical systems: Results on weathering and pedogenesisGeochimica et Cosmochimica Acta, 1987
- Plate Tectonics and Geochemical Composition of SandstonesThe Journal of Geology, 1983
- Rare earth abundances in Deccan trap basaltsLithos, 1977