Zircon U-Pb geochronology and Nd isotope systematics of the Abas terrane, Yemen: Implications for Neoproterozoic crust reworking events

Fitsum G. Yeshanew*, Victoria Pease, Martin J. Whitehouse, Salah Al-Khirbash

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةمراجعة النظراء

13 اقتباسات (Scopus)

ملخص

High-spatial-resolution secondary-ion mass spectrometry (SIMS) UPb 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. 790-725Ma represented by granitic gneisses, the second clearly post-tectonic at c. 625-590Ma. The oldest sample in the post-tectonic group is slightly deformed while younger samples are undeformed indicating that penetrative deformation ceased at c. 625Ma in the Abas region. Whole-rock Nd(t) values between -11 and +0.8, Nd model ages of 1.70-1.13Ga 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 e{open}Nd(t) reflects a change in magma source with increasing juvenile magma and diminishing crustal input during post-tectonic (625-590Ma) 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.

اللغة الأصليةEnglish
الصفحات (من إلى)106-120
عدد الصفحات15
دوريةPrecambrian Research
مستوى الصوت267
المعرِّفات الرقمية للأشياء
حالة النشرPublished - سبتمبر 1 2015

ASJC Scopus subject areas

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بصمة

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