Detrital zircon Hf isotopic composition indicates long-distance transport of North Gondwana Cambrian–Ordovician sandstones

Morag, Navot; Avigad, Dov; Gerdes, Axel; Белоусова, Е. А.; Harlavan, Yehudit

doi:10.1130/g32184.1

Cited by 92 publications

(66 citation statements)

References 35 publications

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“…A similar conclusion was reached by Morag et al (2011), who looked at ε Hf values of the 1000 Ma zircon population in cover sequences of Israel and Jordan. Although their data showed a preponderance of grains with negative ε Hf values, our data from Egypt show two populations at c. 1000 Ma, one with positive ε Hf values and one with negative values.…”

Section: Phanerozoic Sedimentary Cover Rocks and Overlying Modern Sedmentioning

confidence: 60%

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A detrital record of the Nile River and its catchment

Fielding

Najman

Millar

et al. 2016

JGS

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This research uses analyses from Nile catchment rivers, wadis, dunes and bedrocks to constrain the geological history of NE Africa and document influences on the composition of sediment reaching the Nile delta. Our data show evolution of the North African crust, highlighting phases in the development of the Arabian-Nubian Shield and amalgamation of Gondwana in Neoproterozoic times. The Saharan Metacraton and Congo Craton in Uganda have a common history of crustal growth, with new crust formation at 3.0 -3.5 Ga, and crustal melting at c. 2.7 Ga. The Hammamat Formation of the ArabianNubian Shield is locally derived and has a maximum depositional age of 635 Ma. By contrast, Phanerozoic sedimentary rocks are derived from more distant sources. The fine-grained (mud) bulk signature of the modern Nile is dominated by input from the Ethiopian Highlands, transported by the Blue Nile and Atbara rivers. Detrital zircons in the Nile trunk are predominantly derived from Phanerozoic cover rocks. Most detritus from the upstream White Nile is trapped in the Sudd marshes and contributes little to the Nile trunk. Therefore, the White Nile downstream is dominated by locally derived Phanerozoic cover. The White Nile proximal to the Gezira Fan is influenced by the fan's Blue Nile signature.

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Section: Phanerozoic Sedimentary Cover Rocks and Overlying Modern Sedmentioning

confidence: 60%

“…Libya; Meinhold et al 2011;Altumi et al 2013), Jordan and Israel (Kolodner et al 2006;Morag et al 2011)) have put forward contrasting Phanerozoic palaeodrainage models for these regions during deposition of the cover.…”

Section: Phanerozoic Sedimentary Rocksmentioning

confidence: 99%

A detrital record of the Nile River and its catchment

Fielding

Najman

Millar

et al. 2016

JGS

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“…10). In contrast, Paleoproterozoic zircons from the Israeli sediments have negative εHf t similar to those from Tournon (Morag et al, 2011a), which clearly suggests that pre-Cadomian detritus of the EMC were not derived…”

Section: Accepted Manuscriptmentioning

confidence: 80%

“…10). Such a spread was already described from detrital zircons in various peri-Gondwanian terranes (e.g., Albert et al, 2015;Avigad et al, 2012;Bahlburg et al, 2010;Linnemann et al, 2014;Morag et al, 2011a;Teixeira et al, 2011) and is interpreted to reflect mixing between juvenile Neoproterozoic magmas and ancient (Paleoproterozoic-Archean) Gondwana crust. Linnemann et al (2014) proposed that the geotectonic setting required to explain such mixing was a continental magmatic arc developed on stretched Archean-Paleproterozoic crust.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Variable εHf t values (from 0 to -10) of some Paleoproterozoic zircons (2.1-1.9 Ga) may be explained by the interactions between Archean crust (3.0-2.6 Ga) and juvenile magmas during the "Birimian" or "Eburnean" orogenies. This 10; Morag et al, 2011a), but also from minor zircon populations in Saxothuringian sediments in Central Germany (Zeh et al, 2001;Gerdes and Zeh, 2006;Linnemann et al 2008Linnemann et al , 2014 and from the Iberian Massif, Spain and Portugal Teixeira et al, 2011).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

Chelle-Michou¹

2017

Preprint

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The East Massif Central (EMC), France, is part of the internal zone of the Variscan belt where late Carboniferous crustal melting and orogenic collapse have largely obliterated the pre-to early-Variscan geological record. Nevertheless, parts of this history can be reconstructed by using in-situ U-Th-Pb-Lu-Hf isotopic data of texturally well-defined zircon grains from different lithological units. All the main rock units commonly described in the EMC are present in the area of Tournon and include meta-sedimentary and meta-igneous rocks of the Upper Gneiss Unit (UGU) and of the Lower Gneiss Unit (LGU), as well as cross-cuttingVariscan granitoid dikes and a heterogeneous granite coring the major Velay dome. Herein we demonstrate that the UGU and the LGU have markedly distinct zircon records. The results of this study are consistent with deposition of the protoliths of the paragneisses within a backarc basin that was located adjacent to the Arabian-Nubian shield and/or the Saharan Metacraton during the late Ediacaran and collected detritus from the Gondwana continent. At ~545 Ma some of these sedimentary rocks were affected by a first melting event that formed the protoliths of the LGU orthogneisses, those of which subsequently remelted at ca. 308 Ma to form the Velay granite-migmatite dome. Protoliths of the UGU result mainly from a bimodal rift-related magmatism at ~480 Ma, corresponding to melting of the Ediacaran sediments and depleted mantle. Zircon rims from the UGU additionally provide evidence for a metamorphic/migmatitic overprint during the Lower Carboniferous (~350-340 Ma).Finally, several generations of granite dikes of which inherited zircons display characteristics of both the UGU and the LGU were protractedly emplaced from ~322 Ma to ~308 Ma, the youngest of which being coeval with the formation of the Velay dome. Our data further show that the vast majority of crustal material ultimately involved in the Variscan orogeny, which forms the present-day basement in the EMC, was derived from a sedimentary mixture of ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T various components from the Gondwana continent deposited in Ediacaran times, with no evidence for the involvement of an older autochthonous crust.

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Exhumation of the Panama basement complex and basins: Implications for the closure of the Central American seaway

Ramírez

Foster

Min

et al. 2016

Geochem. Geophys. Geosyst.

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The emergence of the Central American isthmus occurred episodically from Eocene to Pliocene time and was caused by a series of tectonic and volcanic processes. Results from zircon U‐Pb geochronology, zircon (U‐Th)/He (ZHe) and apatite (U‐Th)/He (AHe) thermochronology, and zircon Lu‐Hf isotopic data from sedimentary (sandstones and recent river sands) and plutonic rocks from the Azuero Peninsula and Central Panama document the exhumation and uplift history of the Panamanian basement complex. Our data support previous paleobotanical and thermochronological studies that suggest that by middle Eocene time some areas of Central Panama and Azuero Peninsula were exposed above sea level as a series of islands surrounded by shallow open marine waters. The Gatuncillo, Cobachón and Tonosí formations were deposited during this partial emergence. Transtension in the Oligocene‐early Miocene produced various pull‐apart basins (e.g., the Canal Basin) and local uplift that exhumed the Eocene strata (Gatuncillo and Cobachón formations). This event probably reduced circulation between the Pacific Ocean and the Caribbean Sea. The Tonosí Formation records late Miocene to Pleistocene cooling and exhumation, which may be related to uplift above the subducting Coiba Ridge. These results suggest that the emergence of the Isthmus of Panama followed a series of diachronous events that led to the final closure of the Central American seaway.

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Detrital zircon Hf isotopic composition indicates long-distance transport of North Gondwana Cambrian–Ordovician sandstones

Cited by 92 publications

References 35 publications

A detrital record of the Nile River and its catchment

A detrital record of the Nile River and its catchment

Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

Exhumation of the Panama basement complex and basins: Implications for the closure of the Central American seaway

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