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Configuration and Dynamics of the Laurentide Ice Sheet During Document generated on 09/28/2021 12:09 p.m. Géographie physique et Quaternaire Configuration and Dynamics of the Laurentide Ice Sheet During the Late Wisconsin Maximum La configuration et la dynamique de l’inlandsis laurentidien au cours du pléniglaciaire du Wisconsinien supérieur Кoнфигурaция и дипaмикa лaвpeнтьeвcкoгo лeдникoвoгo щитa вo вpeтя пoзднeвиcкoгo мaкcимaльнoгo oлeдeния Arthur S. Dyke, Lynda A. Dredge and Jean-Serge Vincent Volume 36, Number 1-2, 1982 Article abstract Prior to 1943 the Laurentide Ice Sheet was considered to have three major URI: https://id.erudit.org/iderudit/032467ar domes centered in Keewatin, Labrador, and Patricia (TYRRELL, 1898 a, b; DOI: https://doi.org/10.7202/032467ar 1913). FLINT (1943) argued that these centres were of only local and temporary importance and favoured a single-domed ice sheet. Despite the lack of See table of contents supporting geological evidence, and despite the proposition of a Foxe Dome in the interim (IVES and ANDREWS, 1963), the single-dome concept was not seriously challenged until the late 1970's and, in fact, is still strenuously Publisher(s) supported (HUGHES era/., 1977 ; DENTON and HUGHES, 1981). This paper extends and modifies recent conclusions that the Laurentide Ice Sheet had Les Presses de l'Université de Montréal more than one dome at the Late Wisconsin maximum. We propose a model incorporating five domes (M'Clintock, Foxe, Labrador, Hudson, and (?) ISSN Caribou) based on the position of ice divides, ice flow patterns, drift composition, late-glacial features, postglacial isostatic recovery and free-air 0705-7199 (print) gravity anomalies. Our Labrador and Hudson domes closely correspond to 1492-143X (digital) Tyrrell's Labradorean and Patrician ice sheets; our Caribou and M'Clintock domes together with the Franklin Ice Complex over the Queen Elizabeth Explore this journal Islands north of the Laurentide Ice Sheet, correspond to Tyrrell's original Keewatin Ice Sheet. The style of glaciation of the Foxe Basin region was not known to Tyrrell, but our reconstruction of the Foxe Dome is in close Cite this article agreement with the original proposal of Ives and Andrews. Like Tyrrell, our reconstruction is based on field evidence obtained through extensive mapping; Dyke, A. S., Dredge, L. A. & Vincent, J.-S. (1982). Configuration and Dynamics of the single dome model continues to be unsupported by geological data. the Laurentide Ice Sheet During the Late Wisconsin Maximum. Géographie physique et Quaternaire, 36(1-2), 5–14. https://doi.org/10.7202/032467ar Tous droits réservés © Les Presses de l'Université de Montréal, 1982 This document is protected by copyright law. Use of the services of Érudit (including reproduction) is subject to its terms and conditions, which can be viewed online. https://apropos.erudit.org/en/users/policy-on-use/ This article is disseminated and preserved by Érudit. Érudit is a non-profit inter-university consortium of the Université de Montréal, Université Laval, and the Université du Québec à Montréal. Its mission is to promote and disseminate research. https://www.erudit.org/en/ Géographie physique et Quaternaire, 1982, vol. XXXVI, n"s 1-2, p. 5-14, 5 fig. CONFIGURATION AND DYNAMICS OF THE LAURENTIDE ICE SHEET DURING THE LATE WISCONSIN MAXIMUM Arthur S. DYKE, Lynda A. DREDGE and Jean-Serge VINCENT, Terrain Sciences Division, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8. ABSTRACT Prior to 1943 the Laurentide RÉSUMÉ La configuration et la dyna­ IM 5K)MI Ι\ίΐ/ιι/ιη.'\/<ιιιιιΐΊ u ÔUIUIMIIKCI W- Ice Sheet was considered to have three mique de l'inlandsis laurentidien au Hpt'INIIM'IWKIh'li ΗΊ)ΙΙΙΙΚΙΚ:Ι·.ΊΙ U(IIIIUI '.'" H]H"- major domes centered in Keewatin, cours du pléniglaciaire du Wisconsinien Wl lid U)IWHtH KtitlCUtUKlh'O \llll<< HMtI 11,HiKUi Labrador, and Patricia (TYRRELL, 1898 a, supérieur. Avant 1943, on croyait que l'in­ li.HUk'lll'lmt. .In 194.1 It». Bl CMHIUIlOCb. 'lin b; 1913). FLINT (1943) argued that these landsis laurentidien était constitué de .laHpcilll.CHCKHii .IClIlIIKHHi)IU 11)111 HMC.I IpII centres were of only local and temporary trois dômes principaux centrés sur le Kpyiniciiiiiiix ΚΛΠΟ.ΙΠ C itoirrpUMii H Kima ni­ importance and favoured a single-domed Keewatin, le Labrador et le District de ne. Jlaopa.tope n [lalpiilliiii ( liippei.ι. 1898 ice sheet. Despite the lack of supporting Patricia (TYRRELL, 1898 a et b et 1913). mi. a. b u 1913 ι eu)· Φ-ΗΙΗΊ (194.1 ra-jt) yi- geological evidence, and despite the FLINT (1943) a plaidé que ces centres licp'/Kia.i. 1UD nu ucnipi.i Di.i.ni ιιροΜοιιιπ.ι- proposition of a Foxe Dome in the inter­ avaient seulement une importance locale MiI II UMC. Ill IO. II. Kl) MCCIHDC IIUI'ICIIIIC. Oil im (IVES and ANDREWS, 1963), the et temporaire et il a plutôt favorisé le Dl Ulna.I lipc IIIDM ICHHC IIIIIDIC1C DIIlDK)- single-dome concept was not seriously concept d'un inlandsis à dôme unique. ΙΙ0.ΊΙ.ΙΙΟΙ D .IC.UIIIKDHDl D HIH Kl. HccMOipH lia challenged until the late 1970's and, in Malgré l'absence de preuves géologi­ DIcyiCIIIHC ICD.H)I li'ICCKDI D HO II ItcpVK. ICIIIHI fact, is still strenuously supported (HU­ ques, et malgré la proposition subsé­ Il HCCMD I pH lia lipc. I. HlVKCII UC lipll (llailHM KV- GHES era/., 1977 ; DENTON and HUGHES, quente de l'existence du Dôme de Foxe llD.ia 0DKC It MDI lipoMCVK\ I DK lipCMCIIII 1981). This paper extends and modifies (IVES et ANDREWS, 1963), le concept du (Uni u )nipiDt. 196.1 un), KDIIIICIIIUIH Ο I- recent conclusions that the Laurentide dôme unique n'a pas été sérieusement IIOKMID.II.IIDID .ICUIHKDItDID IHUIa HC KbI- Ice Sheet had more than one dome at remis en question avant la fin des années ii.ma.ia copi.eitii.ix un tpavKciuiii .ID KOIIIUI the Late Wisconsin maximum. We pro­ 70. Il est d'ailleurs encore vigoureuse­ 1970-χ ι n.mit u. φ» ΚΊ II'ICCKII. iicc eme HlCp- pose a model incorporating five domes ment appuyé par certains (HUGHES i ii'iiio iiD.LicpvhuitacicM (XbKVi π ιρ.. 1977 (M'Clintock, Foxe, Labrador, Hudson, ef a/., 1977; DENTON et HUGHES, 1981). IO ι: ICIIIDII u Xi,un. 1981 UU). -)ia paon ι a and(?) Caribou) based on the position Cet article complète et modifie des tra­ paCllllipHCl II pail.HCHHCI IIC.UIHIIIIC 111.1 BO. U-I of ice divides, ice flow patterns, drift vaux récents qui affirment que l'inlandsis D IDM. 'iiD .umpcii ii.cHCKiui HUH HMOJI oo- composition, late-glacial features, post­ laurentidien était en réalité constitué de .ICC D UIDID KVJtOJUI H HDt II ICHHC KDHCIIIIC KII II glacial isostatic recovery and free-air plus d'un dôme au cours du plénigla­ licpill) I MHKCIIMa.II.HDI D O. IC .'ICUCIIIIH. Mb I gravity anomalies. Our Labrador and ciaire du Wisconsinien supérieur. Nous npc.LiaiacM MD.ICII.. HK.iio'iaioniyio IIHII. KV- Hudson domes closely correspond to Tyr­ proposons un modèle, basé sur la posi­ IIO.IDB (MaKKiIHlUOK. Φοκο. jlaopa.mp. IYi- rell's Labradorean and Patrician ice tion des lignes de partage des glaces, iDii π (?) Kapimv). ocnonaiiiiyio lia nojto- sheets; our Caribou and M'Clintock les patrons de l'écoulement glaciaire, la VKCi m H .iclopa t.icioii. iiaiipaii.icniiii .IHIIVKC- domes together with the Franklin Ice composition des sédiments glaciaires, HlIH II. Ul. IUIIIDCDH. IU)I UIC_IC.llHIKOHI.IX θΓ)- Complex over the Queen Elizabeth Is­ les formes tardi-glaciaires, les patrons du pa iDitainiii. IIDI.IIIC.IC IIIIIKOBOI D Π toc ι a ι π- lands north of the Laurentide Ice Sheet, relèvement isostatique postglaciaire et 'ICCKDID VpDHIIH II I paitll I aUllOIIIII.IX (UIOMa- correspond to Tyrrell's original Keewatin les anomalies gravimétriques à l'air libre, .iiiii IÎO ι |\ ιιππ.ιχ iisciDi. ΙΙ,ιιιιιι KVIIO.la Jla­ Ice Sheet. The style of glaciation of the qui fait appel à cinq dômes (ceux de opa.ιορ n I y non ό.ιπικο coo ι ne ICI HUD I Foxe Basin region was not known to Tyr­ M'Clintock, de Foxe, du Labrador, d'Hud- IC uiiiKoiti.iM IUiJTUM 'uppcua. .iaf>pa,iop- rell, but our reconstruction of the Foxe son et (?) de Caribou). Nos dômes du CKOMN II lUIipilHliaiICKOMN. Ha IUM KMID.1,1 Dome is in close agreement with the Labrador et d'Hudson correspondent K'apnfn u MaKKjiiiiilOK HMCCIC C _J.pailKjiiiH- original proposal of Ives and Andrews. étroitement aux calottes labradoriennes CKMM .IC.lllll KOHI.IM K'DMII. IC KCOM IUI OCTpO" Like Tyrrell, our reconstruction is based et patriciennes de Tyrrell. Les dômes de nax Kopo.icHi.i n.iiitaitcu.i κ cCBCpj Ol JIaB- on field evidence obtained through ex­ Caribou et de M'Clintock avec le Com­ pcil II.CHCKOI O .ICIIIIIKDIiOID UHIJiI COD I HC I'- tensive mapping; the single dome plexe glaciaire de Franklin sur les îles ci Β \ ιοί iicpnDiia'ia.ii.iioM> κ H na ι IIHCKDMN model continues to be unsupported by de la Reine-Èlizabeth, au nord de la IC IHHK(IHOMy IUHTV Ilippci.UI. HiUIIC BOCCO- geological data. calotte laurentidienne, correspondent à i Mime «yι(OJUi Φοκϋ tiaxo/UJicH KG.UI.KOM la calotte originelle du Keewatin de Tyr­ cooiiiciciituii c ncpnona'ia.H.in.iM npe lliojio- rell. Le style de glaciation de la région VKLMIIIOM IIIiUi II ')u ipioiil. Πο.(οΓ)ΙΙο K01II1.CIIIII1II du bassin de Foxe n'était pas connu de luppcLia. naine itocco t uuiiio ocuoitaiio na Tyrrell, mais notre reconstitution du IIO.ICHI.IX HCCICIOHallllHX MCCIIIOCTII. lipoiiD- Dôme de Foxe est en accord avec la pro­ inillllHXCH lipil IIIIICIICHHIIOM COCKlH.
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