Terrane boundaries within Trans-Hudson Orogen (Quebec–Baffin segment), Canada: changing structural and metamorphic character from foreland to hinterland

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• 作者：St-Onge ; M.R. ; Scott ; D.J. ; Wodicka ; N.
• 关键词：Paleoproterozoic orogen ; Terrane boundary ; Deformation ; Metamorphism
• 刊名：Precambrian Research
• 出版年：2001
• 出版时间：March 30, 2001
• 年：2001
• 卷：107
• 期：1-2
• 页码：75-91
• 全文大小：2.42 M

文摘

Within the Trans-Hudson Orogen in northern Quebec and southern Baffin Island, parautochthonous Archean basement and Paleoproterozoic cover, as well as allochthonous (accreted) Paleoproterozoic units are exposed in a series of antiformal culminations and complementary synclinoria. The parautochthonous rocks and two assemblages of accreted Paleoproterozoic units (crustal terranes) are separated by major tectonic boundaries and associated deformation zones. Field, petrological, and isotopic data document an increase in the width of the deformation zones and a concomitant increase in P–T conditions of metamorphism from orogenic foreland to hinterland. Tectonostratigraphic and geochronological criteria allow footwall and hangingwall units to be consistently distinguished in spite of the changing structural and metamorphic aspect of the terrane boundaries across the width of the orogen.