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Late Riphean Borisikha Ophiolite (Yenisei Ridge); U-Pb zircon age and tectonic setting

A. B. Kuzmichev, I. P. Paderin and A. V. Antonov
Late Riphean Borisikha Ophiolite (Yenisei Ridge); U-Pb zircon age and tectonic setting
Russian Geology and Geophysics (December 2008) 49 (12): 883-893

Abstract

The Borisikha ophiolite, composed of serpentinites and amphibolites, is an extension of the Isakovka ophiolite belt in the near-Yenisei part of the Yenisei Ridge. It is a slightly disturbed approximately 3.5 km thick fragment of the ophiolite association; its crustal part is composed of metamorphosed wehrlite, troctolite, and gabbro cumulates. The cumulate composition and the geochemical features, which do not show any suprasubductional overprinting, indicate that the ophiolite is a normal oceanic lithosphere. Zircons extracted from pegmatoid amphibolite show sectorial magmatic zoning, low U contents, and magmatic Th/U values. The zircon age determined on a SHRIMP-II mass spectrometer is 682+ or -13 Ma, which corresponds to the time of formation of oceanic crust. In the second half of the Late Riphean, the oceanic lithosphere that included the Borisikha ophiolite was subducted beneath the margin of the Siberian continent. At the same time, rifting, formation of half-grabens, and alkaline magmatism took place at the rear of the Yenisei Ridge. Similar events took place in southeastern East Sayan. Correlation between the coeval Late Baikalian structures along the southern and western margins of the Siberian Platform calls for special study.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 49
Serial Issue: 12
Title: Late Riphean Borisikha Ophiolite (Yenisei Ridge); U-Pb zircon age and tectonic setting
Affiliation: Russian Academy of Sciences, Geological Institute, Moscow, Russian Federation
Pages: 883-893
Published: 200812
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 32
Accession Number: 2021-065872
Categories: Structural geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N58°00'00" - N60°00'00", E90°30'00" - E91°30'00"
Secondary Affiliation: Karpinskiy Russian Geological Research Institute, RUS, Russian Federation
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202121
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