Architecture and evolution of the East Greenland Caledonides-An introduction

A.K. Higgins, A. Graham Leslie

Publikation: Bidrag til bog/rapport/konferenceproceedingsBogkapitelForskningpeer review

46 Citationer (Scopus)

Abstrakt

The East Greenland Caledonian orogen can be divided into distinct structurally bound geological domains composed of Archean to Lower Paleozoic lithostrati graphic and lithodemic components derived from the eastern margin of Laurentia. These domains originally evolved as major westward-displaced thrust units in the overriding plate during the collision with Baltica. The western border of the 1300-km-long and up to 300-km-wide segment of the orogen preserved onshore in East Greenland is thrust against the rocks of the Laurentian craton and is largely concealed beneath the Inland Ice. A foreland-propagating thrust pile is well-preserved in the extreme north of the orogen (79°N-82°N), and in the southern half (70°N-76°N), with lesswell- preserved remnants in the western nunataks of the intervening region. Between 76°N and 81°N, the outer coastal region is dominated by high-grade Paleoproterozoic orthogneisses that were reworked during the Caledonian orogeny; most of this region is characterized by the presence of eclogitic mafic enclaves, which testify to exhumation from depths in excess of 50 km in late Caledonian time. Caledonian granites are confined to the southern orogen (70°N-76°N), where they intrude rock units now contained within the upper thrust sheet. Devonian continental basins are conspicuous in the southern part of the orogen and occur offshore farther north; their deposition can be linked to syn- to late-orogenic extension. Carboniferous and younger rocks are exposed onshore in the extreme north of the orogen (80°N-81°N) and are widespread in the south between 71°N and 75°N.

OriginalsprogEngelsk
TitelThe Greenland Caledonides: Evolution of the Northeast Margin of Laurentia
RedaktørerA.K. Higgins, Jane A. Gilotti, M. Paul Smith
ForlagGeological Society of America
Sider29-53
Antal sider25
ISBN (Trykt)9780813712024
DOI
StatusUdgivet - 1 jan. 2008

Publikationsserier

NavnGeological Society of America Memoirs
ForlagGeological Society of America
Vol/bind202

Programområde

  • Programområde 4: Mineralske råstoffer

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