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- W4377206513 abstract "Rb-Sr isotopic data have been obtained for 9 wholerock samples from equigranular and porphyroid granitoids from Sakar pluton. A reliable isochron is based upon 7 of them, the corresponding age being 500±70 Ma, and the initial (87Sr/86Sr)i ratio of 0.70279±0.00149. The low initial strontium ratio indicates a mantle origin for the primary magma, and presumably acid magmas formed by differentiation and fractioning without contamination with old crustal material. It is supposed that the intrusion was simultaneous with a metamorphic event during the Assyntian (550-500 Ma) orogenesis. K-Ar data (within the range 106-120 Ma) reflect argon migration from the minerals due to a Late Cretaceous tectonothermal event." @default.
- W4377206513 created "2023-05-22" @default.
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- W4377206513 date "1990-12-30" @default.
- W4377206513 modified "2023-10-03" @default.
- W4377206513 title "Rb-Sr and K-Ar dating of Sakar granitoid pluton" @default.
- W4377206513 doi "https://doi.org/10.52321/geolbalc.20.6.53" @default.
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