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Evidence from detrital zircons for recycling of Mesoproterozoic and Neoproterozoic crust recorded in Paleozoic and Mesozoic sandstones of southern Lybia

Meinhold, Guido; Morton, Andrew; Fanning, Christopher; Frei, Dirk; Howard, James P.; Phillips, Richard J.; Strogen, Dominic; Whitham, A G

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The geodynamic history of the Precambrian basement in central North Africa as well as the age and provenance of its sedimentary cover sequence are still poorly constrained. Here we present first detrital zircon ages (obtained by LA-SF-ICP-MS and SHRIMP) from Paleozoic and Mesozoic sandstones of the eastern Murzuq Basin, southern Libya, which unconformably overlie the Saharan Metacraton. Establishing the age and provenance of these sandstones has important implications for our understanding of...[Show more]

dc.contributor.authorMeinhold, Guido
dc.contributor.authorMorton, Andrew
dc.contributor.authorFanning, Christopher
dc.contributor.authorFrei, Dirk
dc.contributor.authorHoward, James P.
dc.contributor.authorPhillips, Richard J.
dc.contributor.authorStrogen, Dominic
dc.contributor.authorWhitham, A G
dc.date.accessioned2015-12-10T22:20:27Z
dc.date.available2015-12-10T22:20:27Z
dc.identifier.issn0012-821X
dc.identifier.urihttp://hdl.handle.net/1885/51926
dc.description.abstractThe geodynamic history of the Precambrian basement in central North Africa as well as the age and provenance of its sedimentary cover sequence are still poorly constrained. Here we present first detrital zircon ages (obtained by LA-SF-ICP-MS and SHRIMP) from Paleozoic and Mesozoic sandstones of the eastern Murzuq Basin, southern Libya, which unconformably overlie the Saharan Metacraton. Establishing the age and provenance of these sandstones has important implications for our understanding of the evolution of northern Gondwana during the Paleozoic, especially for reconstructions of paleo-source areas and transport paths.Detrital zircons from the sandstones show mainly early Paleozoic to Neoarchean ages with four main age populations, at 2750-2500. Ma (8%), 2200-1750. Ma (16%), 1060-920. Ma (18%), and 720-530. Ma (39%). About 13% of all concordant grains yield ages of 1600-1000. Ma. In addition, there are 9 zircon grains (0.7% of all concordant grains) with ages of 3600-2800. Ma. The presence of a high number of ca. 1. Ga zircons is enigmatic and their origin is controversial. Besides direct sourcing from ca. 1. Ga igneous rocks in eastern Chad and ca. 1. Ga igneous rocks along the southeastern margins of the Congo and Tanzania cratons, recycling of Neoproterozoic sediments containing ca. 1. Ga zircons is another alternative hypothesis to explain the presence of ca. 1. Ga zircons in the Paleozoic sedimentary sequence of central North Africa. The ubiquitous occurrence of ca. 1. Ga zircons in Paleozoic sediments of southern Libya provides insights into the correlation and paleotectonic arrangement of Gondwana-derived terranes, present, for example, in the eastern Mediterranean and in southwestern Europe. Current paleotectonic models of dextral terrane transport along the northern Gondwana margin during the early Paleozoic may need to be revised.
dc.publisherElsevier
dc.sourceEarth and Planetary Science Letters
dc.subjectKeywords: Libya; Mesoproterozoic; Northern Gondwana; Paleozoic; Sediment provenance; Zircon U-Pb ages; Anoxic sediments; Climate change; Gallium; Igneous rocks; Lead; Recycling; Sandstone; Sedimentology; Zircon; Geochronology; crustal structure; geodynamics; Gondwa Libya; Mesoproterozoic; Northern Gondwana; Paleozoic; Sediment provenance; Zircon U-Pb ages
dc.titleEvidence from detrital zircons for recycling of Mesoproterozoic and Neoproterozoic crust recorded in Paleozoic and Mesozoic sandstones of southern Lybia
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume312
dc.date.issued2011
local.identifier.absfor040303 - Geochronology
local.identifier.absfor040311 - Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy)
local.identifier.absfor040310 - Sedimentology
local.identifier.ariespublicationu4027924xPUB235
local.type.statusPublished Version
local.contributor.affiliationMeinhold, Guido, University of Cambridge
local.contributor.affiliationMorton, Andrew, HM Research Associates Ltd
local.contributor.affiliationFanning, Christopher, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFrei, Dirk, Geological Survey of Denmark and Greenland
local.contributor.affiliationHoward, James P., University of Cambridge
local.contributor.affiliationPhillips, Richard J., University of Cambridge
local.contributor.affiliationStrogen, Dominic, University of Cambridge
local.contributor.affiliationWhitham, A G, University of Cambridge
local.bibliographicCitation.issue1-2
local.bibliographicCitation.startpage164
local.bibliographicCitation.lastpage175
local.identifier.doi10.1016/j.epsl.2011.09.056
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T10:29:09Z
local.identifier.scopusID2-s2.0-80055016514
local.identifier.thomsonID000298456200016
CollectionsANU Research Publications

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