Zircon and titanite age evidence for coeval granitization and migmatization of the early Middle and early Late Proterozoic Saharan Metacraton; example from the central North Sudan basement

Shang, C. K.; Satır, Muharrem; Morteani, G.; Taubald, Heinrich

doi:10.1016/j.jafrearsci.2009.12.006

Cited by 23 publications

(12 citation statements)

References 60 publications

(75 reference statements)

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“…6A). As expected, the majority of single-zircon ages are Neoproterozoic, consistent with the Neoproterozoic formation ages of the rock samples, but 23 of the rock samples used for dating contain zircon grains or zircon cores [31] with additions from [33][34][35][36][37]. Additional sample locations exist for parts of the Eastern Desert, Sinai, and the Midyan terrane (e.g.…”

Section: Inheritancesupporting

confidence: 78%

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An Expanding Arabian-Nubian Shield Geochronologic and Isotopic Dataset: Defining Limits and Confirming the Tectonic Setting of a Neoproterozoic Accretionary Orogen

Johnson¹

2014

TOGEOJ

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Geologic investigations of the Arabian-Nubian Shield (ANS) are supported by a valuable, expanding dataset of geochronologic ages and isotopic analyses. U-Pb zircon SIMS, TIMS, and evaporation data provide robust temporal control on depositional, volcanic, and intrusive events. Nd, Sr, O and, increasingly, Hf isotopic studies provide insights into magma sources and constraints on crustal recycling. Apart from well-established exceptions where Paleoproterozoic and Archean rocks intercalated in the ANS underwent Neoproterozoic reworking, the data elegantly confirm the Neoproterozoic age and juvenile character of the bulk of the ANS. The geochronologic and isotopic data reveal that some ANS sedimentary, volcanic, and igneous rocks contain pre-Neoproterozoic material as xenocrysts and possible glaciogenic clasts, but give no evidence that the ANS is otherwise underlain by any extensive tracts of older crust. Together with structural mapping, the expanding dataset confirms ANS boundaries where long-inferred in the west and suggests the placement of hitherto uncertain boundaries elsewhere. The suggested boundaries imply that the ANS is of a somewhat smaller size than considered in published discussions, which in turn impacts assessment of Neoproterozoic crustal growth rate. The Arabian-Nubian Shield (ANS) is an accretionary orogen at the northern end (present-day coordinates) of the East African Orogen. It is one of the largest expanses of mantle-derived, juvenile Neoproterozoic crust on Earth, underlying an area of ~2.7 x 10 6 km 2 . Its western boundary is a contact with pre-Neoproterozoic crust belonging to the Saharan Metacraton and Congo-Tanzania Craton. Farther south, the ANS is in contact with the Congo-Tanzania Craton and Mozambique Belt. A southeastern ANS margin is recognized as a contact with pre-Neoproterozoic gneiss belonging to a crustal block referred to as Azania. An eastern ANS margin, long a topic of debate, is suspected beneath Phanerozoic cover in central Arabia, and a northwestern margin with late Mesoproterozoic crust is suspected in Sinai.

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Section: Inheritancesupporting

confidence: 78%

“…Neodymium data for the Arabian-Nubian Shield. Data are sourced from compilations by [25] and [23] with additions from [5,80,36,37,72]. the zircon's parent magma assuming it was produced from a volume of average continental crust that was originally derived from a depleted mantle source.…”

Section: Isotope Database and Ans Historymentioning

confidence: 99%

An Expanding Arabian-Nubian Shield Geochronologic and Isotopic Dataset: Defining Limits and Confirming the Tectonic Setting of a Neoproterozoic Accretionary Orogen

Johnson¹

2014

TOGEOJ

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“…14), just north of Bayuda, c. 720 Ma anorogenic alkaline ring-complexes have been preserved from the main Pan-African orogenic event (Shang et al, 2010b). Differently, in the vicinity of the two above regions, high-K calc-alkaline granites and associated high-temperature migmatitic metamorphism have been generated at c. 600 Ma, all rocks having old Nd T DM model ages (Küster et al, 2008;Shang et al, 2010c). Contrastingly, just to the east, in the Arabian-Nubian Shield, all Nd T DM model ages are Neoproterozoic, even those obtained from high-grade metamorphic rocks (Liégeois and Stern, 2010), reflecting the existence there of a large ocean whose closure at c. (Milesi et al, 2010).…”

Section: The Complex Case Of the Saharan Metacraton (Africa)mentioning

confidence: 97%

Metacraton: Nature, genesis and behavior

et al. 2013

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“…Geochronological and isotopic data from the Saharan Metacraton are highly variable as exemplified by the wide range of ages (500-3100 Ma), especially Nd model ages (Abdelsalam et al, 2002;Shang et al, 2010). Archean-Paleoproterozoic ages within the metacraton using Rb-Sr and U-Pb zircon systematics have been reported for gneissic and granulitic rocks by Klerkx and Deutsch (1977), Pin and Poidevin (1987), Sultan et al (1994), .…”

Section: Tectonic Setting Of the Saharan Metacratonmentioning

confidence: 99%