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• W2026704077 abstract "Nd and Sr isotope determinations on late Precambrian to early Palaeozoic igneous and sedimentary rocks from the Arabian Shield are used to investigate the proportion of reworked “older” crust, and the rate at which new crust was generated during the Pan African event. Eight Rb/Sr whole rock isochrons on igneous suites yield ages in the range 770−590 Ma and initial 87Sr/86Sr ratios of 0.7038−0.7023. These data confirm that magmatism in this area was largely restricted to the period 850-550 Ma, and the initial ratios are sufficiently low to preclude significant contributions from a long-lived upper crustal source. The initial 143Nd/144Nd ratios of a variety of lithologies, including several samples of possible “basement”, are all higher than the contemporaneous values for CHUR (εNd = +1.6 to +6.9), suggesting that many were derived directly from the upper mantle, and that any inferred crustal source regions for the remainder could not have separated from likely LREE-depleted mantle reservoirs before 1200 Ma. The Arabian Shield therefore provides an example of rapid crustal growth during the Late Proterozoic, and contrasts with the Damara intracratonic belt of Namibia where Nd and Sr isotopes provide strong evidence for extensive reworking of older continental crust during the same period." @default.
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• W2026704077 date "1982-07-01" @default.
• W2026704077 modified "2023-10-16" @default.
• W2026704077 title "Crustal accretion in the Pan African: Nd and Sr isotope evidence from the Arabian Shield" @default.
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• W2026704077 doi "https://doi.org/10.1016/0012-821x(82)90134-0" @default.
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