Revisiting the depositional age and provenance characteristics of metasedimentary rocks from the basement units in the Central Pontides (N Turkey): New constraints for tectonic evolution of the southern Black Sea region

Description

This dataset includes the whole rock geochemistry, detrital zircon U-Pb, trace element and Lu-Hf and mica Ar-Ar data from a study on the basement units (Devrekani Massif, the Geme Complex and the Serveçay Unit) in the Central Pontides (N Turkey) to constrain the depositional age, provenance characteristics and tectonic evolution of metasedimentary rocks.

Steps to reproduce

Whole rock geochemical analyses of metasedimentary rocks reported here were conducted at the ACME laboratory in Canada and the details for analytical procedure are explained in Gücer et al. (2019). In-situ U-Pb age determinations and rare earth element (REE) concentrations for zircon crystals from metasedimentary rocks were conducted by Perkin-Elmer Nexion2000P ICP-MS instrument coupled to a NWR213 nm laser ablation system at Central Research Laboratory, Çukurova University (Turkey). Details for analytical procedures employed here are similar to those described in Sapancı et al. (2023). Lu-Hf isotope analyses from selected zircon grains were conducted at the Nanjing FocuMS Technology Co. in China using LA-MC-ICP-MS instrument. RESOlution LR laser-ablation system manufactured by Australian Scientific Instruments (AU) and Nu Plasma II MC-ICP-MS produced by Nu Instruments (UK) were combined for the experiments. The 193 nm ArF excimer laser, homogenized by a set of beam delivery systems, was focused on the zircon surface with a fluence of 4.5 J/cm2. Each acquisition process involved a 20 second gas blank background, followed by a spot diameter of 50 m at a 9 Hz repetition rate for 40 seconds. Helium at 370 ml/min was applied as carrier gas to efficiently transport aerosol out of the ablation cell and was mixed with argon at about 0.97 L/min via T-connector before entering ICP torch. The single integration time of Nu Plasma II was set to 0.3 seconds, equating to 133 cycles during the 40 seconds. During the test, every 15 samples of zircon were alternately tested for 3 standard zircons, including GJ-1 (Yuan et al, 2008), 91500 (Wu et al., 2006; Yuan et al., 2008), Plešovice (Sláma et al., 2008), Mud Tank (Griffin et al., 2006; Yuan et al., 2008), and Penglai (Li et al., 2010), to verify the data quality of the zircon Hf isotope ratio. Muscovite crystals from two metasedimentary samples (SV-3 and -6) from the Serveçay Unit were dated at the 40Ar-39Ar and Noble Gas Laboratory in the STEM Faculty at the Open University (UK). The infrared (IR) laser probe spot dating technique was used to analyze muscovite crystals, and details for analytical procedures employed here are as described in Gücer et al. (2019).

Institutions

Categories

Funding

Licence