Intraoceanic tectonics and the development of continental crust: 1.92–1.84 Ga evolution of the Flin Flon Belt, Canada

Lucas, Stephen Bernard; Stern, Richard A.; Syme, E C; Reilly, B A; Thomas, David J.

doi:10.1130/0016-7606(1996)108<0602:itatdo>2.3.co;2

Cited by 137 publications

(93 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1.9 to 1.7 Ga tectonothermal (orogenic) events are ubiquitous in North America, Greenland and Baltica where they coincide with major 23 episodes of continental crust accretion. The Trans-Hudson Orogen, for one, contours the western and northwestern margin of the Superior Province and is a classical example of the addition of juvenile mantle resulting in extensive crustal growth during the Paleoproterozoic (Patchett and Arndt, 1986;Lucas et al 1996). Similarly, the Paleoproterozoic southeastern Churchill Province of Labrador (Fig.…”

Section: Introductionmentioning

confidence: 99%

Application des traceurs isotopiques Pb-Pb Sm-Nd et Lu-Hf à la compréhension de l histoire archéenne du bouclier canadien et à la formation de la croûte continentale

Isnard¹

2003

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Application des traceurs isotopiques Pb-Pb Sm-Nd et Lu-Hf à la compréhension de l histoire archéenne du bouclier canadien et à la formation de la croûte continentale

Isnard¹

2003

View full text Add to dashboard Cite

“…This scenario may account for the surviving Archean rock record, if the dimensions of asthenospheric convection cells mirror the structures and sizes of the preserved continental crustal units and their inferred mantle lithospheric underpinnings. Convergent plate-tectonic features of accretionary complexes, forearc basins, and alkaline igneous arcs of the present-day continental crust are recognizable in some Proterozoic orogens (e.g., Windley 1995;Lucas et al 1996;Korsman et al 1999;Cook et al 1999;Condie 2005). Apparently the disaggregated, small-scale architectures of Archean granite-greenstone belts and spatially associated TTG terranes (Goodwin 1981a(Goodwin , 1981bPercival et al 1994) evolved by degrees into the long, paired-metamorphic + volcanicplutonic belts typical of the Phanerozoic Era (Miyashiro 1961(Miyashiro , 1972.…”

Section: Terrestrial Heat Content and Mantle Circulationmentioning

confidence: 99%

Plate-tectonic evolution of the Earth: bottom-up and top-down mantle circulation

2016

View full text Add to dashboard Cite

Abstract:Intense devolatilization and chemical-density differentiation attended accretion of planetesimals on the primordial Earth. These processes gradually abated after cooling and solidification of an early magma ocean. By 4.3 or 4.2 Ga, water oceans were present, so surface temperatures had fallen far below low-pressure solidi of dry peridotite, basalt, and granite, ϳ1300, ϳ1120, and ϳ950°C, respectively. At less than half their T solidi, rocky materials existed as thin lithospheric slabs in the near-surface Hadean Earth. Stagnant-lid convection may have occurred initially but was at least episodically overwhelmed by subduction because effective, massive heat transfer necessitated vigorous mantle overturn in the early, hot planet. Bottom-up mantle convection, including voluminous plume ascent, efficiently rid the Earth of deep-seated heat. It declined over time as cooling and top-down lithospheric sinking increased. Thickening and both lateral extensional + contractional deformation typified the post-Hadean lithosphere. Stages of geologic evolution included (i) 4.5-4.4 Ga, magma ocean overturn involved ephemeral, surficial rocky platelets; (ii) 4.4-2.7 Ga, formation of oceanic and small continental plates were obliterated by return mantle flow prior to ϳ4.0 Ga; continental material gradually accumulated as largely sub-sea, sialic crust-capped lithospheric collages; (iii) 2.7-1.0 Ga, progressive suturing of old shields + younger orogenic belts led to cratonal plates typified by emerging continental freeboard, increasing sedimentary differentiation, and episodic glaciation during transpolar drift; onset of temporally limited stagnant-lid mantle convection occurred beneath enlarging supercontinents; (iv) 1.0 Ga-present, laminar-flowing asthenospheric cells are now capped by giant, stately moving plates. Near-restriction of komatiitic lavas to the Archean, and appearance of multicycle sediments, ophiolite complexes ± alkaline igneous rocks, and high-pressure-ultrahigh-pressure (HP-UHP) metamorphic belts in progressively younger Proterozoic and Phanerozoic orogens reflect increasing negative buoyancy of cool oceanic lithosphere, but decreasing subductability of enlarging, more buoyant continental plates. Attending supercontinental assembly, density instabilities of thickening oceanic plates began to control overturn of suboceanic mantle as cold, top-down convection. Over time, the scales and dynamics of hot asthenospheric upwelling versus lithospheric foundering + mantle return flow (bottom-up plume-driven ascent versus top-down plate subduction) evolved gradually, reflecting planetary cooling. These evolving plate-tectonic processes have accompanied the Earth's thermal history since ϳ4.4 Ga.Résumé : Un intense dégagement de matières volatiles et une différentiation selon la densité chimique faisait partie de l'accrétion de planétésimaux à la Terre primordiale. Ces processus ont grandement diminué après le refroidissement et la solidification d'un océan primitif de magma. Vers 4,3 ou 4,2 Ga, il existait des océan...

show abstract

“…The following summary of the Flin Flon Belt is taken fiom Lucas et al (1996), who describe the complex history of this region. The Flin Flon Belt is a coIIage of distinct tectonostratigraphic assemblages that were amalgamated at a reiatively early stage in the evolution of the Paleoproterozoic Tm-Hudson Orogen (Stem et al, 1995a, b;Lucas et al, 1996).…”

Section: + Chapter 2 -Geological Summarymentioning

confidence: 99%

“…Lucas et al (1996) describe two regional events @, and D2) that predate deposition of the Missi Group, and with Ryan and Williams (1996), describe D, as a regional event redting in a steepening of tectonostratigraphy throughout the Flin Flon Belt. The Burley Lake syncline provides evidence for a generation of folds predating deposition of the Missi Group within the study area (Stockwell, 1960;Bailes and Syme, 1996; this study).…”

mentioning

confidence: 97%

Structural relations between the polydeformed Flin Flon arc assemblage and Missi Group sedimentary rocks, Flin Flon area, Manitoba and Saskatchewan

Gale¹,

Lucas²,

Dixon³

1999

Rev. can. sci. Terre

View full text Add to dashboard Cite

Intraoceanic tectonics and the development of continental crust: 1.92–1.84 Ga evolution of the Flin Flon Belt, Canada

Cited by 137 publications

References 0 publications

Application des traceurs isotopiques Pb-Pb Sm-Nd et Lu-Hf à la compréhension de l histoire archéenne du bouclier canadien et à la formation de la croûte continentale

Application des traceurs isotopiques Pb-Pb Sm-Nd et Lu-Hf à la compréhension de l histoire archéenne du bouclier canadien et à la formation de la croûte continentale

Plate-tectonic evolution of the Earth: bottom-up and top-down mantle circulation

Structural relations between the polydeformed Flin Flon arc assemblage and Missi Group sedimentary rocks, Flin Flon area, Manitoba and Saskatchewan

Contact Info

Product

Resources

About