Provenance of Austroalpine basement metasediments: tightening up Early Palaeozoic connections between peri-Gondwanan domains of central Europe and Northern Africa

Detrital zircon U–Pb–Hf data from Cambrian sandstones of the Ougarta Mountains Algeria: Implication for palaeoenvironment

“…The ɛHf (t) values of the 618 Ma detrital zircons are from +14 to −20 with a dominant mode at −2, which is broadly consistent with the Hf data of Cambrian–Ordovician sediments from Morocco as well as those from Israel–Jordan albeit with more radiogenic dominant εHf nodes (Figure 8). The widespread nature of the εHf (t) for the Ediacaran detrital zircons is also consistent with previous studies on the Cadomian arc and Pan‐African rocks, which further suggests that the provenance of the Ediacaran detrital zircons in this study could be recycled, eroded material from the Cadomian arc and Pan‐African rocks (Dörr, Zulauf, Gerdes, Lahaye, & Kowalczyk, 2015; Linnemann et al, 2014; Siegesmund, Oriolo, Heinrichs, Basei, & Schulz, 2018). Sixty percentage of the Neoproterozoic‐aged (750–550 Ma) detrital zircons from the Cambrian sandstones in Ougarta yielded negative ɛHf (t) values requiring significant reworking of older crust.…”

“…F I G U R E 4 Histograms of the detrital zircons of the Ougarta Range in Algeria, West Africa [Colour figure can be viewed at wileyonlinelibrary.com] The ϵHf (t) values of the 618 Ma detrital zircons are from +14 to −20 with a dominant mode at −2, which is broadly consistent with the Hf data of Cambrian-Ordovician sediments from Morocco as well as those from Israel-Jordan albeit with more radiogenic dominant εHf nodes(Figure 8). The widespread nature of the εHf (t) for the Ediacaran detrital zircons is also consistent with previous studies on the Cadomian arc and Pan-African rocks, which further suggests that the provenance of the Ediacaran detrital zircons in this study could be recycled, eroded material from the Cadomian arc and Pan-African rocks(Dörr, Zulauf, Gerdes, Lahaye, & Kowalczyk, 2015;Linnemann et al, 2014;Siegesmund, Oriolo, Heinrichs, Basei, & Schulz, 2018).Sixty percentage of the Neoproterozoic-aged (750-550 Ma) detrital zircons from the Cambrian sandstones in Ougarta yielded negative ϵHf (t) values requiring significant reworking of older crust. The Hf results of this study are consistent with the Neoproterozoic-aged detrital zircons in the Cambro-Ordovician sediments of Israel and Jordan, of which 61% have negative ϵHf (t) values(Morag et al, 2011).Therefore, it is likely that the detrital zircons in Ougarta were derived from provenances comprising pre-Neoproterozoic crust, reworked during the assembly of Gondwana, rather than from a homogeneous radiogenic source.The εHf (t) values of the 1,700-2,300 Ma zircons range from 6 to −27 with an average of −10.…”

Neoproterozoic-paleozoic evolution of the Drina formation (Drina-Ivanjica entity)

“…Balk. poluos., 2018, 79 (2), 57-68. input of Cryogenian, Tonian and Stenian sources and subordinate Paleoproterozoic and Neoarchean ages (SIEGESMUND et al, 2018). Such detrital mixture of sources points to the northeastern Saharan Metacraton and the Northern Arabian-Nubian Shield (Sinai) excluding Baltican inheritance.…”

“…Such detrital mixture of sources points to the northeastern Saharan Metacraton and the Northern Arabian-Nubian Shield (Sinai) excluding Baltican inheritance. The volcano-sedimentary protolith record of Neoproterozoic age (ĐAJIĆ, 2010, ĐAJIĆ et al, 2012 was under influence of material eroded and transported from the pre-Pan-African basement (SIEGESMUND et al, 2018). Consequently, we place a juvenile environment in which the Drina Formation originated as a proto-segment of the Apulia/Adria (CASIS & MURPHY, 2018) or the "Paleo-Adria" (FRANKE et al, 2018) as a crustal segment still connected to north Gondwana during Neoproterozoic to Early Paleozoic times (Fig.…”

“…Opposite to considerably well-explored Alpine configuration, Variscan and pre-Variscan evolution of Dinarides, i.e. Adria and Apulia microplates, just recently draw certain attention by applying means of paleo-continental dating or ancient paleo-positioning (SIEGESMUND et al, 2018). However, differentiating the Variscan-and pre-Variscan imprints across SEE basement units requires much more effort in comparison to the European Variscides, predominantеly because of the several thermal episodes which obliterated early magmato-sedimentary record, contemporaneous rapid exhumation and erosion of the Variscan peripheral thickened crust (NEUBAUER & HANDLER, 1999), in addition to the terminal late-Alpine thrusting and nappe stacking.…”