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Zircon U–Pb geochronology and Nd isotope systematics of the Abas terrane, Yemen: Implications for Neoproterozoic crust reworking events.
Naturhistoriska riksmuseet, Enheten för geovetenskap.
Naturhistoriska riksmuseet, Enheten för geovetenskap. (Nordsim)ORCID-id: 0000-0003-2227-577X
2015 (engelsk)Inngår i: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 267, s. 106-120Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

High-spatial-resolution secondary-ion mass spectrometry (SIMS) U–Pb zircon ages, whole-rock Nd isotopic and geochemical data are reported for granites and granitic gneisses from a traverse across the Abas terrane, Yemen, a part of the Precambrian basement of southern Arabian Peninsula. SIMS U–Pb dating identifies two magmatic episodes, the first at c. 790–725 Ma represented by granitic gneisses, the second clearly post-tectonic at c. 625–590 Ma. The oldest sample in the post-tectonic group is slightly deformed while younger samples are undeformed indicating that penetrative deformation ceased at c. 625 Ma in the Abas region. Whole-rock Nd(t) values between −11 and +0.8, Nd model ages of 1.70–1.13 Ga indicate a significant contribution of evolved continental material in the genesis of the Abas granitoids, unlike most of the juvenile Arabian-Nubian Shield (ANS), although there are few inherited zircons. Secular variation in ɛNd(t) reflects a change in magma source with increasing juvenile magma and diminishing crustal input during post-tectonic (625–590 Ma) magmatism. The combination of subduction zone chemistry, absence of older rocks, paucity of inherited zircons, evolved Nd isotopic signatures and the I-type characteristics of the samples suggest that assimilation occurred at depth.

sted, utgiver, år, opplag, sider
2015. Vol. 267, s. 106-120
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URN: urn:nbn:se:nrm:diva-1503DOI: 10.1016/j.precamres.2015.05.037OAI: oai:DiVA.org:nrm-1503DiVA, id: diva2:877147
Tilgjengelig fra: 2015-12-05 Laget: 2015-12-05 Sist oppdatert: 2017-12-01bibliografisk kontrollert

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Yeshanew, Fitsum G.Whitehouse, Martin J.
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