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The ASTIS database cites the following 7 publication(s) by Carolyn Relf. Publications are listed from newest to oldest. Please tell us about publications that are not yet cited in ASTIS.


Paleoproterozoic reworking of an Archean thrust fault in the Hearne domain, western Churchill Province : U-Pb geochronological constraints   /   MacLachlan, K.   Davis, W.J.   Relf, C.
(Canadian journal of earth sciences, v. 42, no. 7, July 2005, p.1313-1330, ill., maps)
References.
ASTIS record 61157.
Languages: English
Web: doi:10.1139/E05-036
Libraries: ACU

The nature, timing and control of Archean crustal architecture on the distribution of Proterozoic reworking in Western Churchill Province are investigated in the Yathkyed Lake area, central Nunavut. The Tyrrell shear zone (TSZ) marks the boundary between the northwestern and central Hearne subdomains, respectively, in the hanging wall and footwall. Metamorphism and deformation in the hanging wall are ca. 2.66-2.50 Ga. Two episodes of metamorphism are recorded in a foliated granodiorite in the footwall, at 1818 +5/-2 and 1827 ±5.6 Ma. The latter age is interpreted as the time of amphibolite-facies metamorphism and deformation in the footwall. A crosscutting dyke provides a minimum age of 1818 ±2 Ma for this metamorphism and deformation. The TSZ is dominated by dextral oblique-slip shear fabrics. A suite of leucogranite dykes provide a maximum age of 1816 ±2 Ma for dextral shearing. Dextral deformation is bracketed between 1815 ±2 and 1811 ±1 Ma, the ages of two other granitoid dykes. In an area of low dextral strain, there are proto-sheath folds related to Neoarchean thrusting. Paleoproterozoic transtensional shearing in the TSZ was localized along a preexisting late Archean thrust fault. The prior existence of this structure resulted in localization of penetrative Paleoproterozoic deformation in its footwall. This domain of high-grade Proterozoic deformation was uplifted in a regional, antiformal, metamorphic culmination, in part, by dextral-normal shearing along the TSZ. Penetrative basement deformation at depth played a role in transmitting farfield stresses related to the Trans-Hudson Orogen into its hinterland. (Au)

B
Archaean era; Deformation; Faults (Geology); Geological time; Geology; Granite; Intrusions (Geology); Lead; Mass spectrometry; Measurement; Metamorphism (Geology); Minerals; Monazite; Plate tectonics; Proterozoic era; Radioactive dating; Radionuclides; Shear zones (Geology); Structural geology; Uranium; Zircon

G0813
Bate Lake region, Nunavut; Imikula Lake region, Nunavut; Nowyak Lake region, Nunavut; Yathkyed Lake region, Nunavut


U/Pb geochronological constraints on Neoarchean tectonism : multiple compressional events in the northwestern Hearne domain, western Churchill Province, Canada   /   MacLachlan, K.   Davis, W.J.   Relf, C.
(Canadian journal of earth sciences, v. 42, no. 1, Jan. 2005, p. 85-109, ill., maps)
References.
ASTIS record 61155.
Languages: English
Web: doi:10.1139/E04-104
Libraries: ACU

In the Yathkyed Lake area the Tyrrell shear zone (TSZ) marks the boundary between the northwestern and central Hearne subdomains of the Western Churchill Province. The TSZ is dominated by Proterozoic dextral strain, but in areas of low dextral strain, older shear fabrics are consistent with an earlier thrusting event. Four syntectonic granite sheets from within low-dextral-strain zones in the TSZ and contiguous shear zones at the base of the Yathkyed belt have ages of 2636-2629, 2652 ±8, 2665-2639, and 2644 ±3 Ma. The Yathkyed belt occurs in the hanging wall of these shear zones and comprises a greenschist- to amphibolite-grade, overturned panel that is overlain by an upper amphibolite-grade polydeformed panel. The geometry is consistent with a thrust-imbricated stack. Two episodes of deformation in the hanging wall are bracket between ca. 2660 and 2616 +6/-4 Ma and between 2616 +6/-4 Ma and ca. 2.60 Ga. The Yathkyed belt is interpreted to have initially been emplaced as a thick-skinned, thrust nappe along the TSZ, during 2.66-2.62 Ga tectonism, and reactivated at ca. 2.62-2.60 Ga, causing further crustal thickening. In the Upper Panel, protracted upper amphibolite-grade metamorphism and associated anatectic melting are recorded by zircon, titanite, and monazite ages ranging from ca. 2561 to 2492 Ma. This thermal event is in part attributed to burial in response to ca. 2.62-2.60 Ga thrust reactivation. The timing and means of emplacement of the Upper Panel on top of the Lower Panel is uncertain; however, ca. 2.50 Ga thrusting elsewhere in the northwestern Hearne subdomain provides one possible mechanism. (Au)

B
Archaean era; Deformation; Faults (Geology); Geological time; Geology; Gneiss; Granite; Intrusions (Geology); Lead; Mass spectrometry; Measurement; Metamorphic rocks; Metamorphism (Geology); Minerals; Monazite; Plate tectonics; Radioactive dating; Radionuclides; Shear zones (Geology); Strain; Structural geology; Uranium; Zircon

G0813
Bate Lake region, Nunavut; Imikula Lake region, Nunavut; Nowyak Lake region, Nunavut; Yathkyed Lake region, Nunavut


Geology and Neoarchean tectonic setting of the Central Hearne supracrustal belt, Western Churchill Province, Nunavut, Canada   /   Hanmer, S.   Sandeman, H.A.   Davis, W.J.   Aspler, L.B.   Rainbird, R.H.   Ryan, J.J.   Relf, C.   Peterson, T.D.
(Precambrian research, v.134, no. 1-2, 20 Sept. 2004, p. 63-83, ill., maps)
(PCSP/PPCP contribution, no. 012-04)
References.
ASTIS record 55664.
Languages: English
Web: doi:10.1016/j.precamres.2004.04.005
Libraries: ACU

The Central Hearne supracrustal belt, one of the largest Neoarchean "greenstone" terranes in the Canadian Shield, occurs in the Hearne domain of the Western Churchill Province, one of the largest, poorly known fragments of Archean crust on Earth. The belt contains two isotopically juvenile volcano-plutonic assemblages (I: ~2710-2690 Ma, and II: ~2685-2680 Ma), separated in time by localised, ~2690 Ma, greenschist-facies deformation (D1), and overlain by ~2680 Ma Archean siliciclastic and chemical sedimentary rocks. Extensive, penetrative, greenschist-facies regional deformation (D2) occurred at ~2680 Ma, with amphibolite-facies metamorphism localised in the aureoles of isotopically juvenile synkinematic plutons. In many respects, the Central Hearne supracrustal belt is similar to other Neoarchean "greenstone" belts that have been interpreted in terms of arc-subduction systems, e.g. the Abitibi greenstone belt of the Superior Province. However, the principal tectonic characteristics of the Central Hearne supracrustal belt include: (i) location in an anomalously wide (>225 km) swath of penecontemporaneous juvenile crust that extends across much of the Hearne domain; (ii) close, primary intercalation of contemporaneous volcanic rocks of MORB-like and arc-like geochemical signatures, coupled with highly discontinuous volcanic map units; (iii) abundant intermediate to felsic volcanic rocks that do not represent a localised, laterally extensive volcanic arc edifice; and (iv) the development of isolated, independent, felsic volcanic centres throughout the magmatic history of the belt. These features are incompatible with oceanic arc or plateau models. We propose that the early history (assemblage I) of the Central Hearne supracrustal belt may be analogous with a modified extensional, suprasubduction "infant arc" model, such as that described for the earliest (Eocene) phase of construction of the Izu-Marianas-Bonin and Tonga arc-trench systems of the Southwest Pacific Ocean. The later history (assemblage II) may reflect attempted initiation of classical subduction and arc construction. (Au)

B
Archaean era; Deformation; Geochemistry; Geological time; Intrusions (Geology); Lava; Magmatism; Metamorphism (Geology); Sedimentary rocks; Structural geology; Volcanism

G0813
Heninga Lake region, Nunavut; Kaminak Lake region, Nunavut; Quartzite Lake region, Nunavut; Tootyak Lake region, Nunavut


Tectonic and thermal history of the Anialik River area, northwestern Slave Province, Canada   /   Relf, C.   Sandeman, H.A.   Villeneuve, M.E.
(Canadian journal of earth sciences, v. 36, no. 7, July 1999, p.1207-1226, ill., maps)
References.
ASTIS record 47346.
Languages: English
Web: doi:10.1139/cjes-36-7-1207
Libraries: ACU

The Anialik River area in the northwestern Slave Province comprises two geological domains of different age and origin that were tectonically juxtaposed at ca. 2650 Ma. The older domain, the Kangguyak gneiss belt, comprises ca. 3300-2700 Ma orthogneisses and paragneisses, interpreted as the remnants of a Mesoarchean continental margin. The younger domain, the Anialik River greenstone belt, consists of ca. 2680 Ma mafic to felsic volcanic rocks interpreted to have formed in an ensimatic island-arc setting. Structural and geochronological evidence suggest collision of the two domains began around 2650 Ma in a transpressive regime that involved oblique (sinistral) subduction of the greenstone belt beneath the Kangguyak domain along the Tokhokatak shear zone. Displacement continued until at least ca. 2600 Ma, when late, two-mica granites intruded along and were deformed in the shear zone. Following ca. 2600 Ma, rocks in both domains and along the fault cooled rapidly to about 350°C. Strongly overprinted muscovite spectra and the young ages for biotite throughout the region imply that a thermal event reset all biotites (but not muscovite) at ca. 2000-1900 Ma, possibly associated with crustal thickening associated with Wopmay (Calderian) orogenesis. The tectonic history of the Anialik River area is significantly different from that documented in the south-central part of the Slave Province, suggesting the Kangguyak domain is a distinct fragment of continental crust that accreted independently from continental crust in the southern Slave Province. (Au)

B
Archaean era; Faults (Geology); Geological time; Geology; Gneiss; Granite; Intrusions (Geology); Metamorphism (Geology); Proterozoic era; Structural geology

G0813
Anialik River region, Nunavut; Bathurst Inlet region, Nunavut


Ages of detrital zircons from supracrustal sequences in the Slave Province : implications for age of basement   /   Villeneuve, M.E.   Henderson, J.R.   Relf, C.   Hrabi, B.   Jackson, V.
In: Exploration overview 1994, Northwest Territories : mining, exploration and geological investigations / Compiled by R. Kusick and Stephen P. Goff. - Yellowknife, N.W.T. : NWT Geological Mapping Division, 1995, p. 61-62
Reference.
ASTIS record 36343.
Languages: English
Libraries: ACU

The Slave Province contains abundant supracrustal units that appear to have been deposited episodically between 3.1 and 2.6 Ga. Much of the sedimentation consists of immature sediments such as greywackes and conglomerates that contain abundant zircons that can be tied directly to units older than 2.7 Ga. ... Taken together, ... [the data presented] suggest three broad age groupings for basement to the ca. 2.7 Ga Yellowknife Supergroup: 3.05-3.3 Ga (peak at 3.15 Ga), 2.88-2.95 Ga (peak at 2.95 Ga) and 2.75-2.7 Ga. (Au)

B
Geological time; Gneiss; Magmatism; Metamorphism (Geology); Petrology; Quartz; Sedimentation; Sediments (Geology); Structural geology; Volcanism; Zircon

G0812
Gras, Lac de, region, N.W.T.; Winter Lake (64 29 N, 112 55 W) region, N.W.T.


Late Archean tectono-magmatic evolution of the central Slave Province, Northwest Territories   /   King, J.E.   Davis, W.J.   Relf, C.
(Symposium of the Geological Association of Canada-Mineralogical Association of Canada Joint Annual Meeting, Toronto, Ontario, May 27-28, 1991 : the tectonic evolution of the Superior and Slave provinces of the Canadian Shield = Réunion commune annuelle : symposium de L'Association géologique du Canada-Association minéralogique du Canada, Toronto (Ontario), le 27-18 mai, 1991 : l'évolution tectonique des provinces du Lac Supérieur et des esclaves du Bouclier canadien / Edited by K.D. Card and J.E. King. Canadian journal of earth sciences, v. 29, no. 10, Oct. 1992, p.2156-2170, ill., maps)
References.
ASTIS record 36302.
Languages: English
Web: doi:10.1139/e92-171
Libraries: ACU

An early tectono-stratigraphic and late plutonic assemblage are distinguished in the central part of the Archean Slave Province (Contwoyto Lake area) on the basis of their relationship to deformation and metamorphic episodes, and by geochemical characteristics. The older assemblage, which predates the onset of intense deformation and the thermal peak of metamorphism, comprises 2.68-2.65 Ga calc-alkaline volcanic and plutonic rocks, as well as extensive turbidites. The younger assemblage comprises ca. 2.61-2.58 Ga plutonic units that were emplaced during and after deformation (D1-D3) and the thermal peak of metamorphism. Compositions of the late plutonic units vary systematically with time of intrusion from an early, calc-alkaline, diorite-tonalite suite to late peraluminous granites. The early assemblage is interpreted to represent remnants of an island arc (or arcs) overlain by turbidites and accreted during D1 and D2. The later assemblage is interpreted as a product of late- to post-accretion, suprasubduction-zone magmatism and associated crustal melting. (Au)

B
Archaean era; Geochemistry; Geological time; Geology; Granite; Magmatism; Metamorphism (Geology); Petrology; Proterozoic era; Stratigraphy; Structural geology; Volcanism

G0812, G0813
Contwoyto Lake region, N.W.T./Nunavut; Great Slave Lake region, N.W.T.; N.W.T.


Two distinct shortening events during late Archean orogeny in the west-central Slave Province, Northwest Territories, Canada   /   Relf, C.
(Symposium of the Geological Association of Canada-Mineralogical Association of Canada Joint Annual Meeting, Toronto, Ontario, May 27-28, 1991 : the tectonic evolution of the Superior and Slave provinces of the Canadian Shield = Réunion commune annuelle : symposium de L'Association géologique du Canada-Association minéralogique du Canada, Toronto (Ontario), le 27-18 mai, 1991 : l'évolution tectonique des provinces du Lac Supérieur et des esclaves du Bouclier canadien / Edited by K.D. Card and J.E. King. Canadian journal of earth sciences, v. 29, no. 10, Oct. 1992, p.2104-2117, ill., maps)
References.
ASTIS record 36300.
Languages: English
Web: doi:10.1139/e92-167
Libraries: ACU

Late Archean structures in the west-central part of the Slave Province formed during two separate orogenic events. Evidence for early folding and thrusting in an accretionary prism is confined to a narrow belt along the east margin of an older microcontinent (the Anton terrane) in the west part of the province. Structures related to this event are overprinted by regional low-pressure metamorphism. Subsequent shortening occurred in a continental-arc setting in which folding and faulting was accompanied by calc-alkaline magmatism and regional low-pressure metamorphism. Although the entire region was affected, the bulk of shortening during the second orogenic event occurred east of the early fold and thrust belt. The first orogenic event produced a suture zone between old continental crust to the west and juvenile rocks to the east, and during the second orogenic event rocks on either sides of the suture were tectonically underplanted and intruded. (Au)

B
Archaean era; Geological time; Geology; Metamorphism (Geology); Palaeozoic era; Petrology; Plate tectonics; Proterozoic era; Sedimentation; Stratigraphy; Structural geology; Volcanism

G0812, G0813
Contwoyto Lake region, N.W.T./Nunavut; Great Slave Lake region, N.W.T.; N.W.T.; Point Lake (65 15 N, 113 04 W) region, N.W.T.


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