TY - JOUR
T1 - Polyorogenic history of the East Greenland Caledonides
AU - Kalsbeek, Feiko
AU - Thrane, Kristine
AU - Higgins, A. K.
AU - Jepsen, Hans F.
AU - Leslie, A. Graham
AU - Nutman, Allen P.
AU - Frei, Robert
PY - 2008
Y1 - 2008
N2 - The Caledonian orogen of East Greenland contains remnants of Archean, Paleoproterozoic, late Mesoproterozoic, and early Neoproterozoic rocks that occur within far-traveled thrust sheets, and bear witness to a complex polyorogenic history of the region prior to Caledonian orogenesis. Archean and Paleoproterozoic complexes consist mainly of granitoid orthogneisses. A succession of Paleoproterozoic tholeiitic metabasalts is present in some of the foreland windows. A major unit of late Mesoprotero zoic metasedimentary rocks (Krummedal supracrustal sequence) contains early Neoproterozoic (ca. 950 Ma) as well as Caledonian granites. There is evidence for Archean (ca. 2800-2600 Ma), Paleoproterozoic (2000-1750 Ma), and late Grenvillian (ca. 950 Ma) deformation and metamorphism, but Caledonian overprinting complicates the study of these events. This paper presents a broad overview of the various rock units with structural, geochemical, and geochronologic data. The Paleoproterozoic metabasaltic rocks from the foreland windows are described in more detail.
AB - The Caledonian orogen of East Greenland contains remnants of Archean, Paleoproterozoic, late Mesoproterozoic, and early Neoproterozoic rocks that occur within far-traveled thrust sheets, and bear witness to a complex polyorogenic history of the region prior to Caledonian orogenesis. Archean and Paleoproterozoic complexes consist mainly of granitoid orthogneisses. A succession of Paleoproterozoic tholeiitic metabasalts is present in some of the foreland windows. A major unit of late Mesoprotero zoic metasedimentary rocks (Krummedal supracrustal sequence) contains early Neoproterozoic (ca. 950 Ma) as well as Caledonian granites. There is evidence for Archean (ca. 2800-2600 Ma), Paleoproterozoic (2000-1750 Ma), and late Grenvillian (ca. 950 Ma) deformation and metamorphism, but Caledonian overprinting complicates the study of these events. This paper presents a broad overview of the various rock units with structural, geochemical, and geochronologic data. The Paleoproterozoic metabasaltic rocks from the foreland windows are described in more detail.
KW - Caledonian orogen
KW - East Greenland
KW - Grenvillian granites
KW - Mesoproterozoic supracrustal rocks
KW - Paleoproterozoic basement
UR - http://www.scopus.com/inward/record.url?scp=77949991615&partnerID=8YFLogxK
U2 - 10.1130/2008.1202(03)
DO - 10.1130/2008.1202(03)
M3 - Article
SN - 0072-1069
VL - 202
SP - 55
EP - 72
JO - Memoir of the Geological Society of America
JF - Memoir of the Geological Society of America
ER -