Age and tectonothermal record of Laurentian basement, Caledonides of NE Greenland

Tucker, Robert D.; Dallmeyer, R. D.; Strachan, R. A.

doi:10.1144/gsjgs.150.2.0371

Cited by 34 publications

(20 citation statements)

References 47 publications

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“…The observed 410-420 Ma ages are consistent with the 206 Pb/ 238 U ages of igneous and metamorphic grains inferred to have suffered Pb loss ( Fig. 7; Supplemental (Tucker et al, 1993;Kalsbeek et al, 1993Kalsbeek et al, , 1999Nutman and Kalsbeek, 1994;Gilotti et al, 2004;McClelland et al, 2006McClelland et al, , 2009Sartini-Rideout et al, 2009;Gilotti and McClelland, 2011;Hallett et al, 2014). Blue bands are same as in Figure 12.…”

Section: Local Derivation Of Detrital Zircon From a Metamorphic Terranesupporting

confidence: 80%

Carboniferous basin in Holm Land records local exhumation of the North-East Greenland Caledonides: Implications for the detrital zircon signature of a collisional orogen

et al. 2016

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Carboniferous strata of the Wandel Sea Basin unconformably overlie the Laurentian Precambrian crystalline rocks of the Caledonian hinterland at its northernmost exposures in Holm Land (~80°N). Complex zircon from an intermediate gneiss gives an upper-intercept age of 1878 ± 71 Ma, a protolith age which fits with the regional 1.8-2.0 Ga calc-alkaline arc. A strongly deformed pegmatite was intruded at 435 ± 17 Ma, and it is a rare example of Caledonian magmatism in the northern sector of the orogen. Omphacite confirms the presence of eclogite (sensu stricto) lenses in the basement complex, thus documenting the northern extent of the NorthEast Greenland eclogite province formed during the Caledonian collision with Baltica. Holm Land lies in the eastern block of the eclogite province, where an ultrahigh-pressure (UHP) meta morphic event took place at 365-350 Ma. Zircon from a Holm Land eclogite lacks a Eu anomaly, has a flat heavy rare earth element pattern, and gives a sensitive high-resolution ion microprobe U-Pb age of 423 ± 7 Ma, and it is thus interpreted as the time of high-pressure (HP) metamorphism. This age overlaps with the established age of widespread HP metamorphism for the eclogite province (i.e., 415-395 Ma), rather than the younger UHP metamorphism. Westward thrusting of the NorthEast Greenland eclogite province onto the Laurentian margin after 395 Ma and subsequent exhumation of this uppermost thrust sheet provided a substrate for Carboniferous deposition. Detrital zircon age spectra from arkosic sandstones of the late Viséan (ca. 330-340 Ma) Sortebakker and early Moscovian (ca. 310-315 Ma) Kap Jungersen Formations record the progressive unroofing of the NorthEast Greenland Caledonides. All seven samples have a major peak at 1.8-2.0 Ga, and five also have a 1.75 Ga peak, matching the Paleoproterozoic arc and later anorogenic granitoids that comprise the crystalline basement. Paleozoic grains are sparse in the Sortebakker sandstones, but they constitute a pronounced 400 Ma peak in the younger Kap Jungersen Formation. The composition of the detritusincluding garnet clasts, the high amount of discordant zircon (40%), and the large numbers of grains with metamorphic rims that cluster around 410 Ma-reflects a local provenance sourced in the NorthEast Greenland eclogite province, with some input from the overlying thrust sheets. Other Devonian and Carboniferous basins within and peripheral to the Caledonides also show distinct signatures, demonstrating that there is not a simple, representative detrital zircon signature for the Caledonian orogen.

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Section: Local Derivation Of Detrital Zircon From a Metamorphic Terranesupporting

confidence: 80%

Carboniferous basin in Holm Land records local exhumation of the North-East Greenland Caledonides: Implications for the detrital zircon signature of a collisional orogen

et al. 2016

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“…Isotopic data from orthogneiss units in some of the other foreland areas exposed along the margin of the Caledonian orogen in East Greenland have yielded Palaeoproterozoic protolith ages, e.g. Kalsbeek et al (1993) and Tucker et al (1993) obtained Palaeoproterozoic ages for basement gneisses from the western part of Dronning Louise Land (77°N, 25°W) and quartz porphyry bodies and grey granites within the Eleonore Sø window have yielded similar ages (Higgins & Leslie 2004, this volume). None of the so far dated foreland rock units have yielded convincing Archaean ages.…”

Section: Previous Geochronological Studiesmentioning

confidence: 99%

Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides

Thrane

2004

GEUS Bulletin

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The Charcot Land tectonic window exposes crystalline basement gneisses, which form part of the foreland of the East Greenland Caledonides. These gneisses were previously believed to be Archaean in age, on the basis of imprecise K-Ar analyses carried out in the early 1980s on hornblende from amphibolitic bands and inconclusive Rb/Sr isotope data. New U-Pb singlezircon ion microprobe analyses on the gneisses of the window yield upper intercept ages of 1916 ± 21 and 1928 ± 11 Ma, and are interpreted to represent the age of crystallisation of the igneous protolith. The foreland gneisses of the Charcot Land window are similar in age to parts of the allochthonous gneiss complexes of structurally overlying thrust sheets, but the two terranes have different lithological and structural characteristics. No Archaean rocks have been identified with certainty in any of the East Greenland Caledonian foreland windows.

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“…The sedimentary successions that predate Rodinia, found inboard of the convergent margin, for which detrital zircon age spectra are available include the Siamarnekh Formation (Wheeler, 1964;Spencer et al, 2015), Wakeham Group (Madore et al, 1998;van Breemen and Corriveau, 2005), Seal Lake Group (Reardon et al, 2009), Siamarnekh Formation (Spencer et al, 2015), Appalachian Inliers (Carrigan et al, 2003;Gates et al, 2004;Ownby et al, 2004), and Composite Arc Belt (Sager-Kinsman and Parrish, 1993;Friedman and Martignole, 1995;Wodicka et al, 1996;Corrigan and van Breemen, 1997). These successions show multimodal age spectra that include zircon grains derived from both the crystalline basement of the cratonic interior (>1500 Ma) but also younger populations associated with magmatism related to subduction zone(s) preceding the Grenville orogeny (ca.…”

Section: Case Study Ii-foreland Proterozoic Basins Systems Of the Grementioning

confidence: 99%

“…The "back end" of the orogenic cycle, a process from subduction to collision to rifting, is seen in the foreland basin systems of the Grenville orogeny sensu stricto, in which there is a transition from subduction and continental collision to rifting and the formation of a passive margin ( Fig. 4B; see McLelland et al, 1996;van Breemen and Corriveau, 2005). We contend that within these orogenic settings, the evolution of sedimentation can be characterized by increasing dissimilarity with time and therefore can provide an important metric through which the geodynamic regimes of ancient orogens can be deconvolved.…”

Section: Multisample Comparison Of Detrital Age Spectramentioning

confidence: 99%

Visualizing the sedimentary response through the orogenic cycle: A multidimensional scaling approach

Spencer

Kirkland

2015

Lithosphere

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Changing patterns in detrital provenance through time have the ability to resolve salient features of an orogenic cycle. Such changes in the age spectrum of detrital minerals may be attributable to fluctuations in the geodynamic regime (e.g., opening of seaways, initiation of subduction and arc magmatism, and transition from subduction to collisional tectonics with arrival of exotic crustal material). This changing geodynamic regime leads to a variety of sedimentary responses driven by basin formation, transition from rift to drift sedimentation, or inversion and basement unroofing. Detrital zircon grains within sedimentary rocks chart the aforementioned processes by the presence of older detrital zircon populations during basement unroofing events, followed by a successive younging in the detrital zircon age signature either through arrival of young island arc terranes or the progression of subduction magmatism along a continental margin. Hence, the response within the detrital zircon cargo to the geodynamic environment can be visualized in their changing age patterns. However, such patterns are often cryptic and evaluated on the basis of visual comparisons. In an effort to enhance objectivity in the diagnosis of the sedimentary response to the orogenic cycle, we illustrate the utility of a multidimensional scaling approach to detrital zircon age spectra. This statistical tool characterizes the "dissimilarity" of age spectra from various sedimentary successions, but it importantly also charts this measure through time. We present three case studies in which multidimensional scaling reveals additional useful information on the style of basin evolution within the orogenic cycle. The Albany-Fraser orogen in Western Australia and Grenville orogen (sensu stricto) in Laurentia demonstrate clear patterns in which detrital zircon age spectra become more dissimilar with time. In stark contrast, sedimentary successions from the Mesoproterozoic to Neoproterozoic North Atlantic region reveal no consistent pattern. Rather, the North Atlantic region reflects a signature consistent with significant zircon age communication due to a distal position from the orogenic front, oblique translation of terranes, and complexity of the continental margin. This statistical approach provides a mechanism to connect the evolutionary patterns of detrital zircon age spectra to the geodynamics of an orogenic system, which in many cases is a direct function of proximity to the orogenic front.

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Age and tectonothermal record of Laurentian basement, Caledonides of NE Greenland

Cited by 34 publications

References 47 publications

Carboniferous basin in Holm Land records local exhumation of the North-East Greenland Caledonides: Implications for the detrital zircon signature of a collisional orogen

Carboniferous basin in Holm Land records local exhumation of the North-East Greenland Caledonides: Implications for the detrital zircon signature of a collisional orogen

Palaeoproterozoic age of a basement gneiss complex in the Charcot Land tectonic window, East Greenland Caledonides

Visualizing the sedimentary response through the orogenic cycle: A multidimensional scaling approach

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