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- W2084780395 abstract "Abstract A metabasalt dredged at a junction of the median valley with the Atlantis fracture zone (30°01/tN, 42°04/tW) in the Mid-Atlantic Ridge shows complete recrystallization under a metasomatic condition, though the original igneous texture of a coarse-grained basalt is still recognizable. There is strong circumstantial evidence suggesting that this rock is not an ice-rafted erratic, but an authentic Mid-Atlantic Ridge rock. The 40 Ar- 39 Ar age of this sample is 169 m.y. (Jurassic) which should represent the time of recrystallization. The initial value ( 87Sr/ 86 Sr ) O is 0.720, far above the values previously observed in oceanfloor basalts, including both tholeiitic and alkalic rocks (0.701–0.704). Sr with such a high isotopic ratio is considered to have been introduced by metasomatism during metamorphism by a solution coming from a continental mass or masses which were then located very close to the Mid-Atlantic Ridge. The 40 Ar− 39 Ar age of sample AM50 may approximate the time of the commencement of the opening of the Atlantic. All these data support the possible existence of ancient rock masses in the Mid-Atlantic Ridge, as was formerly claimed by Bonatti, Melson and others." @default.
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- W2084780395 date "1976-03-01" @default.
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- W2084780395 title "Additional evidence of existence of ancient rocks in the mid-Atlantic ridge and the age of the opening of the Atlantic" @default.
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- W2084780395 doi "https://doi.org/10.1016/0040-1951(76)90167-0" @default.
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