Composition and U-Pb isotopic age determinations (SHRIMP II) of the ophiolitic assemblage from the Shaman paleospreading zone and the conditions of its formation (North Transbaikalia) |
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| Authors: | I V Gordienko A N Bulgatov N I Lastochkin V S Sitnikova |
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| Institution: | 1.Geological Institute, Siberian Branch,Russian Academy of Sciences,Ulan-Ude,Russia |
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| Abstract: | The Upper Riphean Shaman ophiolitic assemblage was first distinguished and described in the territory of North Transbaikalia.
Ophiolites found within a narrow suture (Shaman paleospreading zone) are represented by serpentinized ultrabasites with numerous
plagiogranite veins having a U-Pb age of 971 ± 14 Ma, gabbros (939 ± 11 Ma), and basalts (892 ± 16 Ma). The ophiolite section
also contains dikes of diabases and gabbro-diabases, siliceous-terrigenous stratum (black shale) of Upper Riphean age. The
fragments of island-arc complexes (differentiated volcanites, gabbro-diorites, granites) of the Kelyan island-arc system are
also found within the Shaman zone. The presence of Upper Riphean ophiolites in Baikalides of North Transbaikalia testifies
to the formation of oceanic crust of the marginal spreading basins in the Precambrian Paleo-Pacific Ocean and the emerging
Paleoasian Ocean. |
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