Eastern Laurentia in Rodinia: constraints from whole-rock Pb and U/Pb geochronology

Loewy, Staci L.; Connelly, James N.; Dalziel, Ian W. D.; Gower, Charles F.

doi:10.1016/s0040-1951(03)00338-x

Cited by 138 publications

(67 citation statements)

References 73 publications

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“…In a recent contribution Rapela et al (2007) suggested that after initial break-up of Rodinia the Western Sierras Pampeanas Grenville-age basement was part of a larger conti nental mass embracing the Mesoproterozoic central and northern Arequipa-Antofalla craton (Peru), and the Amazonia craton (Brazil). These continental domains coalesced during the Sunsas (Grenvilleage) orogeny (Loewy et al, 2004;Tohver et al, 2002Tohver et al, , 2004Casquet et al, 2008). This large continent collided obliquely with the Rio de la Plata and Kalahari cratons to the east (present coordinates) to produce the Pampean orogeny in the early Cambrian, with the disappearance of the intervening Clymene Ocean (Trindade et al, 2006).…”

Section: Geological and Paleogeographical Settingmentioning

confidence: 97%

“…1) (Vujovich and Kay, 1998;Vujovich et al, 2004), and the northern part of the Arequipa-Antofalla craton in Peru were probably part of a continuous mobile belt of that age along the paleo-margin of the Amazonia craton (Casquet et al, 2008). This mobile belt has been considered as the result of collision between Amazonia and southernmost Laurentia, supposedly during the amalgamation of Rodinia (Wingate et al, 1998;Loewy et al, 2003Loewy et al, , 2004Tohver et al, 2002Tohver et al, , 2004Casquet et al, 2008).…”

Section: Paleogeo Gra Phic Implicati Onsmentioning

confidence: 99%

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A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

Casquet

Pankhurst

Galindo

et al. 2008

Precambrian Research

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A deformed ca. 570 Ma syenite-carbonatite body is reported from a Crenville-age (1.0-1.2 Ca) terrane in the Sierra de Maz, one of the Western Sierras Pampeanas of Argentina. This is the first recognition of such a rock assemblage in the basement of the Central Andes. The two main lithologies are coarse-grained syen ite (often nepheline-bearing) and enclave-rich fine-grained foliated biotite-calcite carbonatite. Samples of carbonatite and syenite yield an imprecise whole rock Rb-Sr isochron age of 582 ± 60 Ma (MSWD = 1.8; Sri = 0.7029); SHRIMP U-Pb spot analysis of syenite zircons shows a total range of2 0 6Pb_238U ages between 433 and 612 Ma, with a prominent peak at 560-580 Ma defined by homogeneous zircon areas. Te xtural interpretation of the zircon data, combined with the constraint of the Rb-Sr data suggest that the car bonatite complex formed at ca. 570 Ma. Further disturbance of the U-Pb system took place at 525 ± 7 Ma (Pampean orogeny) and at ca. 430-440 Ma (Famatinian orogeny) and it is concluded that the Western Sierras Pampeanas basement was joined to Condwana during both events. Highly unradiogenic values in calcites (0.70275-0.70305) provide a close estimate for the initial Sr isotope composition of the carbonatite magma. Sm-Nd data yield BNds7 0 values of +3.3 to +4.8. The complex was probably formed during early opening of the Clymene Ocean from depleted mantle with a component from MesojNeo proterozoic lower continental crust.

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Section: Geological and Paleogeographical Settingmentioning

confidence: 97%

Section: Paleogeo Gra Phic Implicati Onsmentioning

confidence: 99%

A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

Casquet

Pankhurst

Galindo

et al. 2008

Precambrian Research

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“…Recent work has suggested that the southern and central portion of Grenville in eastern Laurentia was accreted when the proto-North-American plate collided with another continent at the Laurentian margin (e.g. Loewy et al, 2003;Fisher et al 2010). Key elements of pre-Grenvillian basement are summarised below (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Petersson

Scherstén

Andersson

et al. 2015

Precambrian Research

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“…A path through this confusion was provided by Tohver et al (2004) and Loewy et al (2003Loewy et al ( , 2004, who noted the striking similarities between neodymium model ages in the French Broad Massif and those in Amazonia. We discuss this in the next section.…”

Section: Age Of Source Rocks For Adirondack-appalachian Mesoproterozomentioning

confidence: 99%

Tectonic Evolution of the Adirondack Mountains and Grenville Orogen Inliers within the USA

McLelland

Selleck

Bickford³

2013

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Recent investigations in geochronology and tectonics provide important new insights into the evolution of the Grenville Orogen in North America. Here, we summarize results of this research in the USA and focus upon ca. 1.4–0.98 Ga occurrences extending from the Adirondack Mountains to the southern Appalachians and Texas. Recent geochronology (mainly by U/Pb SHRIMP) establishes that these widely separated regions experienced similar tectonomagmatic events, i.e., the Elzevirian (ca. 1.25–1.22 Ga), Shawinigan (ca. 1.2–1.14 Ga), and Grenvillian (ca. 1.09–0.98 Ga) orogenies and associated plate interactions. Notwithstanding these commonalities, Nd model ages and Pb isotopic mapping has revealed important differences that are best explained by the existence of contrasting compositions of deep crustal reservoirs beneath the Adirondacks and the southern Appalachians. The isotopic compositions for the Adirondacks lie on the same Pb–Pb array as those for the Grenville Province, the Granite-Rhyolite Province and the Grenvillian inliers of Texas suggesting that they all developed on Laurentian crust. On the other hand, data from the southern Appalachians are similar to those of the Sunsas Terrane in Brazil and suggest that Amazonian crust with these Pb–Pb characteristics was thrust onto eastern Laurentia during its Grenvillian collision with Amazonia and subsequently transferred to the latter during the late Neoproterozoic breakup of the supercontinent, Rodinia, and the formation of the Iapetus Ocean. The ca. 1.3–1.0 Ga Grenville Orogen is also exposed in the Llano Uplift of Texas and in small inliers in west Texas and northeast Mexico. The Llano Uplift contains evidence for a major collision with a southern continent at ca. 1.15–1.12 Ga (Kalahari Craton?), magmatic arcs, and back-arc and foreland basins, all of which are reviewed. The Grenvillian Orogeny is considered to be the culminating tectonic event that terminated approximately 500 m.y. of continental margin growth along southeastern Laurentia by accretion, continental margin arc magmatism, and metamorphism. Accordingly, we briefly review the tectonic and magmatic histories of these Paleoproterozoic and Mesoproterozoic pre-Grenvillian orogens, i.e., Penokean, Yavapai, and Mazatzal as well as the Granite-Rhyolite Province and discuss their ~5000 km transcontinental span.SOMMAIREDes recherches récentes en géochronologie et en tectonique révèlent d’importants faits nouveaux sur l’évolution de l’orogénie de Grenville en Amérique du Nord. Nous présentons ici un sommaire des résultats de cet effort de recherche aux USA en mettant l’accent sur les indices datés entre env. 1,4 et 0,98 Ga, à partir des monts Adirondack jusqu’au sud des Appalaches et au Texas. Des données géochronologiques récentes (par microsonde SHRIMP principalement) indiquent que les roches de ces régions très éloignées les unes des autres ont subies l’effet d’épisodes tectonomagmatiques similaires, par exemple, aux orogenèses de l’Elzévirien (env. 1.25–1.22 Ga), de Shawinigan (env. 1.2–1.14 Ga), et du Grenvillien (env. 1.09–0.98 Ga), ainsi que des interactions des plaques associées. Malgré ces points communs, la chronologie Nd et la cartographie isotopique Pb a révélé des différences importantes qui s’expliquent plus aisément par des compositions contrastées des réservoirs profonds de croûte sous les Adirondacks et le sud des Appalaches. Les compositions isotopiques des Adirondacks sont de la même gamme Pb-Pb que ceux de la Province de Grenville, de la Province Granite-rhyolite et des boutonnières grenvilliennes du Texas, suggérant qu'ils se sont tous développées sur la croûte des Laurentides. Par ailleurs, les données des Appalaches du sud sont semblables à celles du terrane de Sunsas au Brésil, ce qui incite à penser que la croûte amazonienne, avec de telles caractéristiques Pb-Pb, a été poussée sur la portion est de Laurentia lors de sa collision grenvillienne avec l’Amazonie puis laissée à cette dernière au cours de la rupture du supercontinent Rodinia vers la fin du Néoprotérozoïque, avec la formation de l'océan Iapetus. L’orogène de Grenville (1,3 à 1,0 Ga env.) est également exposé dans le soulèvement de Llano au Texas et dans de petites boutonnières dans l'ouest du Texas et le nord du Mexique. Le soulèvement de Llano montre des indices d'une collision majeure avec un continent au sud, entre env. 1,15 et 1,12 Ga (craton de Kalahari?), des zones d’arcs magmatiques, d'arrière-arc et de bassin d'avant-pays, chacun étant présenté ci-dessous. L'orogenèse de Grenville est considéré comme l'événement tectonique culminant qui marqué la fin d’une période d’environ 500 ma d’accroissement de la marge continentale le long de la bordure sud-est de la Laurentie, par accrétion, magmatisme d’arc de marge continentale, et métamorphisme. C’est pourquoi, nous passons brièvement en revue l'histoire tectonique et magmatique de ces orogènes pré-grenvilliennes paléoprotérozoïques et mésoprotérozoïques, pénokéenne, de Yavapai, et de Mazatzal ainsi que la Province de Granite-rhyolite, et discutons de son étendue sur env. 5 000 km.

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Eastern Laurentia in Rodinia: constraints from whole-rock Pb and U/Pb geochronology

Cited by 138 publications

References 73 publications

A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

A deformed alkaline igneous rock–carbonatite complex from the Western Sierras Pampeanas, Argentina: Evidence for late Neoproterozoic opening of the Clymene Ocean?

Zircon U-Pb, Hf and O isotope constraints on growth versus reworking of continental crust in the subsurface Grenville orogen, Ohio, USA

Tectonic Evolution of the Adirondack Mountains and Grenville Orogen Inliers within the USA

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