Data for: Temporal, Spatial and Geochemical Evolution of Late Cenozoic Post-Subduction Magmatism in Central and Eastern Anatolia, Turkey

Published: 31-03-2020| Version 1 | DOI: 10.17632/gjv4ndfkbm.1
Contributor:
Fabien Rabayrol

Description

This study primarily relies on the compilation, integration and interpretation of published age and geochemical data from late Cenozoic igneous rocks in central and eastern Anatolia, Turkey. Most dates were obtained by K-Ar and 40Ar/39Ar dating techniques on igneous biotite, hornblende, feldspar, groundmass, and whole-rock material from volcanic rock samples. Those dates can be interpreted as crystallization ages, but are susceptible to alteration and partial to whole resetting, which may conspire to yield dates that may be too young. The previously-published lithogeochemical and Sr-Nd-Pb isotopic analyses from 28 late Cenozoic igneous units were carefully filtered to generate a working database. All of the analyses from altered or weathered samples, yielding a total volatile content (LOI) greater than 5 wt % and acquired from enclaves, cumulates or xenoliths were eliminated. Outlying compositions were discarded in order to increase the internal coherence of the database. Despite this screening procedure, the resultant database suffers from a lack of homogeneity, data control and analytical differences as analyses were obtained through different analytical packages including variable set of elements, instrument (XRF, ICP-MS, INAA, etc.) and dissolution methods (total fusion, aqua regia, etc.) from various laboratories (Bureau Veritas, ActLabs, ALS, universities, etc.). The report of Fe oxidation state in the literature suffers from some approximation despite a careful data compilation (e.g., Fe2O3, FeO, FeOt and Fe2O3t). Approximations also lie in sample age and location as this information is not always provided in the literature. Published Sr-Nd-Pb radiogenic isotope data were compiled from literature. We corrected the 87Sr/86Sr, 143Nd/144Nd, 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios to age to get initial isotopic ratios for those situations where the element concentration of Sr, Rb, Nd, Sm, Th, U and Pb was available. Most of the published Pb analyses were bracketed by the SRM981 standard. As reference values vary among publications, all the published Pb data were normalized to Galer and Abouchami (1998).

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