Premium
U–Pb and geochemical evidence for a Cryogenian magmatic arc in central Novaya Zemlya, Arctic Russia
Author(s) -
Corfu F.,
Svensen H.,
Neumann E.R.,
Nakrem H. A.,
Planke S.
Publication year - 2010
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.2010.00924.x
Subject(s) - geology , baltica , zircon , devonian , subduction , mafic , titanite , geochemistry , orogeny , geochronology , ordovician , paleontology , tectonics
Terra Nova, 00, 1–9, 2010 Abstract A unique set of mafic intrusives collected during a 1921 expedition to Novaya Zemlya and reported to cut Devonian sedimentary rocks, are shown instead to represent a Cryogenian magmatic arc. Zircon and titanite in four samples from Mashigin Fjord and Matochkin Strait yield U–Pb ages of 716–704 Ma and the dyke geochemistry shows typical subduction‐zone features. These rocks have the characteristics of a peri‐Gondwanan subduction‐related complex, and originally could have been affiliated to the Avalonian systems before accreting to Baltica during the Timanian orogeny.