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- Title
Rb-Sr and Sm-Nd systematics of gabbro and dolerites from fragments of ophiolite complexes of the Middle Urals.
- Authors
Ronkin, Yu.; Semenov, I.; Puchkov, V.
- Abstract
The Rb-Sr and Sm-Nd age data obtained for sheeted dolerite dykes and rocks of the Platinum Belt of the Urals within the Tagil segment of the paleoceanic spreading structure (Middle Urals) are discussed. The study of the Rb-Sr isotope systematics of gabbro allowed us to reveal errochronous dependencies, which yielded ages of 415 and 345 Ma at (Sr/Sr) = 0.70385 ± 0.00068 and 0.7029 ± 0.0010, correspondingly. The Sm-Nd isotope age data demonstrate a specific coincidence of the chronometric ages of the sheeted dolerite dyke complex (426 ± 54, 426 ± 34, and 424 ± 19 Ma) and gabbro from the Revda gabbro-ultramafic massif (431 ± 27 Ma) and from screens between dolerite dykes in the sheeted dyke complex (427 ± 32 Ma, 429 ± 26 Ma). The proximity of the Sm-Nd ages of gabbro and dolerite can be explained by the thermal effect of the basaltic melt, which is the protolith for the dyke complex, on the hosting gabbro.
- Subjects
DIABASE; SEDIMENTARY rocks; OROGENIC belts; SEDIMENTS; GEOLOGICAL time scales
- Publication
Doklady Earth Sciences, 2017, Vol 477, Issue 1, p1270
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X17110162