The Black Lake shear zone: A boundary between terranes in the Adirondack Lowlands, Grenville Province

Wong, Martin S.; Peck, William H.; Selleck, Bruce; Catalano, Joseph Paul; Hochman, Steven D.; Maurer, Joshua T.

doi:10.1016/j.precamres.2011.04.001

Cited by 11 publications

(9 citation statements)

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“…Together with the timing of displacement along the CCZ, this documents formation of a symmetrical gneiss dome or core complex (Fig. 7G) during the terminal collapse of the Ottawan Orogen (Wong et al 2011(Wong et al , 2012McLelland et al 2012). The difference between the two areas is that hanging wall rocks are not exposed in the eastern AHT suggesting that a master collapse fault may lie buried beneath the Paleozoic cover to the east (McLelland et al 2011;Wong et al 2012).…”

mentioning

confidence: 77%

“…4, Edwardsville, E and Canton, C) and have been correlated with AMCG rocks in the AHT (McLelland et al 1988). Peck et al (2011Peck et al ( , 2013 have shown that the geochemical properties of the Edwardsville pluton link its source rocks to the Frontenac Terrane, which may comprise the underlying deep crust in the westernmost ALT. Note that none of the ca.…”

Section: Geology Of the Adirondack Mountainsmentioning

confidence: 97%

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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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confidence: 77%

Section: Geology Of the Adirondack Mountainsmentioning

confidence: 97%

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

McLelland

Selleck

Bickford³

2013

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“…This structure should not be confused with a structure defi ned in Wong et al (2011), termed the Black Lake shear zone, which is described as a broad, diffuse, heterogeneous ductile deformation zone, likely slightly oblique to the Black Lake fault and perhaps located just northwest of it. Wong et al (2011) suggest that this feature could be the terrane-bounding shear zone, and in fact characterized it as a suture. The Black Lake fault and Wong et al's (2011) Black Lake shear zone, when appropriate, will be referred to collectively as the Black Lake structures, given their uncertain tectonic signifi cance ( Figs.…”

Section: Adirondack Lowlands To Frontenac Terranementioning

confidence: 99%

“…This suggests that a terrane-bounding shear zone or perhaps a suture does juxtapose the Frontenac terrane and Adirondack Lowlands. Candidates for the boundary include the Black Lake fault (Davidson, 1995;Peck et al, 2004;McLelland et al, 2010a;Chiaren zelli et al, 2010) or proposed Black Lake shear zone (Wong et al, 2011).…”

Section: Frontenac Terrane Adirondack Lowlands Relationshipsmentioning

confidence: 99%

Timing and kinematics of deformation in the northwest Adirondack Lowlands, New York State: Implications for terrane relationships in the southern Grenville Province

Baird

Shrady

2011

Geosphere

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Determining the relationship among crustal blocks within an orogen is a key factor in understanding the architecture and construction of that orogen. Within the large, mid-Proterozoic Grenville Province, the relationship between the Adirondack Lowlands and the adjacent Frontenac terrane is ambiguous. Review of previous work demonstrates that the Adirondack Lowlands have different plutonic suites, a lower grade of metamorphism, and a different geochemical signature. However, the timing and kinematics of deformation in the Lowlands, and their relation to major orogenic events, have not previously been well constrained, making comparisons with the Frontenac terrane diffi cult.On the northwestern edge of the Adirondack Lowlands, detailed structural analysis of upper-amphibolite grade migmatites and marbles reveals two penetrative deformation phases. Interference of F 1 and F 2 folds results in Type 3 fold interference patterns and is suffi cient to produce the regional map patterns. The Noname ductile shear zone, a 0.5-2-km-wide northeast-striking steep ductile shear zone with subvertical lineation, developed during D 2 . The steep geometry of the Noname ductile shear zone, paired with consistent sinistral kinematic indicators only found in subhorizontal surfaces, indicate that kinematics for D 2 was sinistral transpression.Sensitive high-resolution ion microprobereverse geometry (SHRIMP-RG) U-Pb zircon geochronology from three granitic samples that have well-defi ned relationships with D 1 and D 2 indicates that both deformation phases developed through continuous or progressive deformation during ca. 1185-1145 Ma. Zircon geochronology from a quartzite, and the presence of melt during all deformation phases, demonstrate that metamorphism was synchronous with deformation.This work reveals that the Shawinigan orogeny (1190-1140 Ma) developed the dominant structural features observed in the northwest Adirondack Lowlands. These structures are the result of the northward collision of a rifted slice of the Laurentian margin (Adirondis) into previously accreted terranes on the margin of Laurentia. Shawinigan deformation of the Adirondack Lowlands may have outlasted that of the Frontenac terrane across any potential terrane-bounding shear zone. While Frontenac terrane and Adirondack Lowlands geology are suffi ciently distinct to warrant separate terrane designation, evidence is lacking to indicate that a suture exists between them.

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“…The BLSZ is a northeast-trending zone of high strain that separates the distinct rock types and metamorphic histories of the Frontenac terrane and Adirondack Lowlands (Mezger et al, 1993;Wong et al, 2011). The BLSZ is on December 13, 2013 geosphere.gsapubs.org Downloaded from predominantly subvertical and accommodated northwest-directed shortening and perhaps transpressional deformation.…”

Section: Geologic Settingmentioning

confidence: 99%

Orogenic to postorogenic (1.20-1.15 Ga) magmatism in the Adirondack Lowlands and Frontenac terrane, southern Grenville Province, USA and Canada

et al. 2013

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Magmatism in the southern GrenvilleProvince records a collisional and postcollisional history during the period 1.20-1.15 Ga in the Adirondack Lowlands (New York State, USA) and the Frontenac terrane (Ontario, Canada). The 1.20 Ga bimodal Antwerp-Rossie suite of the Adirondack Lowlands was produced by subduction in the Trans-Adirondack backarc basin. This was followed by intrusion of the 1.18 Ga alkalic to calc-alkalic Hermon granite, which may have been generated by melting of metasomatized mantle during collision of the Adirondack Lowlands and Frontenac terrane during the Shawinigan orogeny. The Hyde School gneiss plutons intruded the Adirondack Lowlands at 1.17 Ga, and Rockport granite intruded into the Adirondack Lowlands and Frontenac terrane, stitching the Black Lake shear zone, which marks the boundary between these terranes. Subsequent extensional collapse and lithospheric delamination caused voluminous anorthosite-mangerite-charnockitegranite plutonism. In the Frontenac terrane, this event is represented by the 1.18-1.15 Ga Frontenac suite, which is composed predominately of ferroan granitoids produced from melting of the lower crust by underplating mafi c magmas. The Edwardsville, Honey Hill, and Beaver Creek plutons are newly recognized members of this suite in the Adirondack Lowlands. High oxygen isotope ratios of this suite in the central Frontenac terrane and western Adirondack Lowlands point to the presence of underthrust altered oceanic rocks in the lower crust. Oxygen isotopes of the Frontenac suite in both terranes preclude its derivation from mantle melts alone. Downloaded from SLd BLSZ Adirondack Lowlands Que bec Ont ario Mo Ma Figure 1. (A) Location of the study area within the Grenville Province. (B) Location map and subdivisions of the allochthonous monocyclic belt (AMB) of the Grenville Province (after Peck et al., 2004, and references therein). (C) Detail of B. AMCG-anorthosite-mangerite-charnockitegranite, CMB-Quebec-Central Metasedimentary Belt of Quebec, SLd-Sharbot Lake domain of the Elzevir terrane, Ma-Marcy anorthosite massif, Mo-Morin anorthosite massif, CCSZ-Carthage-Colton shear zone, BLSZ-Black Lake shear zone, LSZ-Labele shear zone, MSZ-Maberly shear zone, RLSZ-Robertson Lake shear zone. Thin line clusters indicate zones of penetrative deformation.on December 13, 2013 geosphere.gsapubs.org Downloaded from

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The Black Lake shear zone: A boundary between terranes in the Adirondack Lowlands, Grenville Province

Cited by 11 publications

References 63 publications

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

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

Timing and kinematics of deformation in the northwest Adirondack Lowlands, New York State: Implications for terrane relationships in the southern Grenville Province

Orogenic to postorogenic (1.20-1.15 Ga) magmatism in the Adirondack Lowlands and Frontenac terrane, southern Grenville Province, USA and Canada

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