Abstract
U–Pb dating, Hf-isotope, and trace-element studies on two detrital zircon samples from sandstone interlayers in the Upper Jurassic conglomerates of the Southern coast of the Mountainous Crimea provide new information on the primary crystalline complexes from which those conglomerates were sourced. The U–Pb age spectra of studied zircons suggest that they were most likely sourced from the (meta)sedimentary complexes of the Eastern and Western Pontides blocks and the Dobrogea platform. In particular, a close similarity of the Precambrian age spectra with the detrital zircons from Late Neoproterozoic–Late Paleozoic (meta)sedimentary complexes of the Dobrogea block provides strong supporting evidence for the affinity between the Pre-Mesozoic basement of the Crimea and the Dobrogea platform. The zircons in the first sample were recycled through Dobrogea sedimentary complexes and originated from terranes with Amazonia affinities, while zircons in the second sample were recycled through the Taurides and originated from terranes related to northeastern Africa and Arabia. The strong similarity of the Precambrian parts of the age spectra of the Dobrogea complexes and the sample K15-007 suggests a resemblance of the Crimea’s Pre-Mesozoic foundation and the Dobrogea platform. Initial analytical data are provided in Electronic Supplementary Materials A (ESM A). Descriptions of measurement parameters, methodologies, and constants used to process primary analytical data and some processing results are reported in ESM B (Figs. B1–B8). Schemes of locations within Balkans–Anatolia–Black Sea–Caucasus region the crystalline complexes with Jurassic, Triassic, Permian–Carboniferous, as well as Late Neoproterozoic–Cambrian and Ordovician–Devonian ages are in ESM C (Figs. C1, C3–C5).
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Acknowledgements
This study has been carried out following the plans of the scientific research of the IPE RAS. The analytical data were obtained using instrumentation funded by DEST Systemic Infrastructure Grants, ARC LIEF, NCRIS/Au Scope, industry partners and Macquarie University, and ARC FT110100-685 (Belousova E.A.) grant support. Handling of geochemical data, analysis processing, the regional gathering of geological materials, and publication preparation were executed with partial support from the RFBR (Grant 19-05-00284). This is contribution 1348 from the ARC Centre of Excellence for Core to Crust Fluid Systems (http://www.ccfs.mq.edu.au) and 1311 in the GEMOC Key Centre.
Funding
IPE RAS (Federal basic funding). Macquarie University ARC FT110100-685 (Belousova E.A.). Russian Foundation Basic Research (Grant 19-05-00284) (Romanyuk T.V.).
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531_2019_1770_MOESM7_ESM.pdf
ESM-B.pdf - This file contains descriptions of measurement parameters, methodologies and constants used to process primary analytical data (see ESM A) and some primary processing results in Figs. B1–B8. 7 (PDF 5379 kb)
531_2019_1770_MOESM8_ESM.pdf
ESM-C.pdf - This file contains schemes (Figs. C1–C5) of locations within BABSC the crystalline complexes with Jurassic, Triassic, Permian–Carboniferous, Ordovician–Devonian and Late Neoproterozoic–Cambrian ages, as well as the U–Pb age data of some Archean and Paleoproterozoic crystalline complexes of the Ukrainian shield and adjacent regions (Fig. C6). In addition, a comparison of U–Pb ages of detrital zircons from samples K15-007 and K15-003 with data for the Early Cretaceous turbidites of the Caglayan basin, Central Pontides (Z5), and for the Early Oligocene sandstones of the Maikop Groupe, the Sochi-Adler region, the Caucasus (Z9) is presented (Fig. C7). The extended list references used to prepare the paper is presented. 8 (PDF 9476 kb)
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Kuznetsov, N.B., Belousova, E.A., Griffin, W.L. et al. Pre-Mesozoic Crimea as a continuation of the Dobrogea platform: insights from detrital zircons in Upper Jurassic conglomerates, Mountainous Crimea. Int J Earth Sci (Geol Rundsch) 108, 2407–2428 (2019). https://doi.org/10.1007/s00531-019-01770-2
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DOI: https://doi.org/10.1007/s00531-019-01770-2