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Rb-Sr AND Sm-Nd ISOTOPES STUDY OF SERPENTINITES AND THEIR IMPACT ON THE TECTONIC SETTING OF ZAGROS SUTURE ZONE, NE IRAQ | ||
| Iraqi Bulletin of Geology and Mining | ||
| Article 1, Volume 7, Issue 1, 2011, Pages 67-75 | ||
| Authors | ||
| Khalid J. Aswad; Elias M. Elias; Nabaz R. Aziz | ||
| Abstract | ||
| In an attempt to establish a chronology for serpentinite rocks, from various areas along the line of the Zagros Suture Zone (NE Iraq), Sr-Nd isotopic studies have been carried out on selected samples collected from an association of ophiolite suite and ophiolitic mélange samples. Sr model ages of (80 – 110) Ma for three ophiolite suite samples are concordant with previous K-Ar ages of (97 – 118) Ma and may indicate ophiolite formation and/ or serpentinization above an intra-oceanic suprasubduction zone of island-arc affinity (fore-arc) during the Albian – Cenomanian. A profound Rb-Sr age variation of (150 – 770) Ma is due to the effect of mélange phenomenon on ophiolitic serpentinites (imbricate), tectonically associated with intraoceanic suprasubduction zone (~ Late Maastrichtian) of Walash volcano – sedimentary sequence of island-arc affinity. The Sr and εNd isotopic composition suggests that the source of serpentinite is enriched-upper mantle, which with time had developed an isotopic heterogeneity. The probable age of emplacement of serpentinites associated with ophiolite massif was ~ 30 Ma, while ophiolitic mélange serpentinites were emplaced post Paleocene – Eocene. | ||
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