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59319647.Pdf Article "Stratigraphic and Structural Framework of Upper Middle Ordovician Rocks in the Head Lake- Burleigh Falls Area of South-Central Ontario" Bruce V. Sanford Géographie physique et Quaternaire, vol. 47, n° 3, 1993, p. 253-268. Pour citer cet article, utiliser l'information suivante : URI: http://id.erudit.org/iderudit/032956ar DOI: 10.7202/032956ar Note : les règles d'écriture des références bibliographiques peuvent varier selon les différents domaines du savoir. Ce document est protégé par la loi sur le droit d'auteur. L'utilisation des services d'Érudit (y compris la reproduction) est assujettie à sa politique d'utilisation que vous pouvez consulter à l'URI https://apropos.erudit.org/fr/usagers/politique-dutilisation/ Érudit est un consortium interuniversitaire sans but lucratif composé de l'Université de Montréal, l'Université Laval et l'Université du Québec à Montréal. Il a pour mission la promotion et la valorisation de la recherche. Érudit offre des services d'édition numérique de documents scientifiques depuis 1998. Pour communiquer avec les responsables d'Érudit : [email protected] Document téléchargé le 12 février 2017 07:14 Géographie physique et Quaternaire, 1993, vol. 47, n° 3, p. 253-268, 15 fig. STRATIGRAPHIC AND STRUCTURAL FRAMEWORK OF UPPER MIDDLE ORDOVICIAN ROCKS IN THE HEAD LAKE- BURLEIGH FALLS AREA OF SOUTH- CENTRAL ONTARIO Bruce V. SANFORD, Independent Exploration Geologist,17 Meadowglade Gardens, Nepean, Ontario K2G 5J4. ABSTRACT Field investigations in the RÉSUMÉ Cadre stratigraphique et structu­ ZUSAM M EN FASSU NG Stratigraphischer Head Lake-Burleigh Falls area of south- ral des roches de l'Ordovicien moyen supé­ und struktureller Rahmen der Felsen aus central Ontario, that focused mainly on the rieur dans la région de Head Lake-Burleigh dem oberen mittleren Ordovizium in der Covey Hill(?), Shadow Lake, Gull River and Falls, au centre-sud de l'Ontario. Des levés Gegend von Head Lake-Burleigh Falls im Coboconk formations along the Paleozoic de terrain faits dans la région de Head Lake- sùdlichen Zentrum von Ontario. FeId- escarpment, provided clear evidence of Burleigh Falls, portant surtout sur les forma­ forschungen im Head Lake-Burleigh FaIIs- faulting. Observed and inferred structural tions de Covey HiII (?), Shadow Lake, Gull Gebiet, sùdliches Zentrum von Ontario, die deformation, coupled with faciès changes River et Coboconk ont fait ressortir la pré­ sich haupt-sàchlich auf die Bildungen von within the Shadow Lake and lower Gull sence de failles. Les déformations tecto­ Covey Hill(?), Shadow Lake, Gull River und River, point to a succession of basement niques observées et supposés, ainsi que les Coboconk entlang des palàozoischen movements during the Phanerozoic. These changements de faciès dans le Shadow Steilabfalls konzentrierten, ergaben ein kla- Lake et le cours inférieur de la GuII River, range from Hadrynian-Early Cambrian, res BiId der Verweiiung. Die beobachteten montrent qu'il y a eu une succession de mou­ through Middle Ordovician to post-late und vermuteten strukturellen Verformungen Middle Ordovician times. Some of the earlier vements du socle pendant le weisen zusammen mit Fazies-Ànderungen movements (Hadrynian-Early Cambrian to Phanérozoïque. Ces mouvements se sont im Shadow Lake und dem unteren Lauf des late Middle Ordovician) appear to be coinci­ produits de l'Hadryanien-Cambrien inférieur GuII River auf eine Aufeinander-folge von dent with, and probably related to, plate tec­ à l'Ordovicien moyen, puis jusqu'après l'Or­ Untergrundbewegungen wàhrend des tonic events and the associated Taconian dovicien moyen supérieur. Certains des pre­ Phanerozoikums. Dièse reichen vom frùh- orogeny that were in progress along the miers mouvements (Hadryanien- Cambrien hadrynischen Kambrium durch das mittlere southeastern margins of the North American inférieur à l'Ordovicien moyen) semblent Ordovizium bis zu Zeiten nach dem spàten continent. Post-Middle Ordovician block coïncider avec la tectonique des plaques, et mittleren Ordovizium. Einige der frùheren faulting, on the other hand, may have been y être reliés, et avec l'orogenèse du triggered by any number of epeirogenic Taconique qui s'est manifestée sur les Bewegungen (frùh-hadrynisches Kambrium events related to late stage Taconian, marges sud-ouest du continent nord- bis spates mittleres Ordovizium) scheinen Acadian or Alleghanian orogenies in Late américain. La formation de failles dans les mit der Tektonik der Platten sowie der tako- Ordovician to Carboniferous times, or possi­ blocs après l'Ordovicien moyen, d'autre part, nischen Orogenèse, welche entlang der bly to rifting associated with continental a pu être provoquée par un ou plusieurs sudôstlichen Rander des nordamerikanis- break-up and initiation of seafloor spreading événements épirogénétiques liés aux oroge­ chen Kontinents stattgefunden haben, zei- processes in the early Mesozoic. nèses du dernier étage du Taconique, de tlich zusammenzufallen und verbunden zu l'Acadien et de l'Alléghanien de l'Ordovicien sein. Die Bildung von Brùchen in den supérieur au Carbonifère pendant la forma­ Blôcken nach dem mittleren Ordovizium tion des fossés d'effondrement lié à la sépa­ kônnte andererseits durch ein oder mehrere ration des continents et le début de l'expan­ epirogenetische Ereignisse ausgelôst wor- sion océanique au Mésozoïque inférieur. den sein, verbunden mit den Orogenesen der letzten takonischen, akadischen und alleghanischen Stufe vom spàten Ordovizium bis zum Karbon, oder wohl auch verbunden mit Spaltung auf Grund des Auseinanderbrechens der Kontinente und dem Beginn der Ausbreitung des Meeresbodens im frùen Mesozoikum. Manuscrit révisé accepté le 5 août 1993 254 B.V. SANFORD INTRODUCTION these is the southwest-trending Central Metasedimentary Belt Boundary Zone (CMBBZ) that was tectonically active Upper Middle Ordovician carbonate rocks have a wide dis­ during the Grenvillian orogeny (Hanmer, 1988). This struc­ tribution in the Great Lakes region of Canada and the United tural element is exposed on the Canadian Shield and contin­ States. They are present in the subsurface in the Michigan ues to the southwest beneath the Paleozoic cover rocks. and Appalachian basins. From there they rise to the surface Other linear features (that may represent possible structural along the periphery of both tectonic elements to form an out­ boundaries) are magnetic anomalies that, in general, parallel crop belt extending from the Adirondack region of New York the NE-SW structural grain of the Central Metasedimentary State, through south-central Ontario, to the states of Michigan Belt (Geological Survey of Canada, 1989). Finally there are and Wisconsin (Douglas, 1969; Sanford and Baer, 1981). linear topographical features, including the major drainage systems, superimposed on the Paleozoic terrain. These In south-central Ontario, upper Middle Ordovician carbon­ appear to have orientations similar to those of the surface lin­ ate rocks onlap two major positive tectonic elements (Fig. 1), eaments in neighbouring segments of the Canadian Shield the Algonquin and Frontenac arches, both of which are and are, thus, conceived as possible major fracture systems. known to have undergone vertical tectonic movements through successive periods of Precambrian and Paleozoic time (Sanford et al., 1985). To obtain a general understand­ Prior to field investigations, the bedrock geology of the ing, as to the timing and magnitude of these movements, a Head Lake-Burleigh Falls area was compiled onto modern field survey was carried out in 1992 to investigate one small 1:50,000 scale topographical maps (Energy, Mines and segment of Paleozoic terrain where it onlaps Precambrian Resources, 1979, 1980) from geological maps prepared by basement rocks of the Frontenac Arch between Head Lake officers of the Geological Survey of Canada (Caley and and Burleigh Falls (Fig. 2). This segment of Paleozoic terrain Liberty, 1952; Winder, 1954). Although mapped more than 40 was selected because of the variety of prominent surface and years ago, the geological investigations proved to be of excel­ sub-surface lineaments that transect the region. Chief among lent quality in terms of accuracy, and required only minor revi- SAGUENAY GRABEN & *A^ * t ' * \_\ * ,' TIMISKAMING ' t - w ^QL ' GRABEN " . - ' - j - - ' • t 0Ù < ? ' " *' ' ' 4 "OS " 4 ' ' APPALACHIAN OROGEN M Phanerozoic undivided ST LAWRENCE PLATFORM Foreland Basm I I Cratonic Basin I I Shelf CANADIAN SHIELD I—I—1 Precambrian undivided, LU—I Central Medasedimentary Bell RIFT-ZONE Contour on Precambrian basement in metres (datum • sealevel) I I Area of study 0 100 200 km FIGURE 1. Principal Phanerozoic tectonic elements of the Great Principaux éléments tectoniques phanèrozoïques de la région des Lakes region. Grands Lacs. Géographie physique et Quaternaire. 47(3), 1993 STRATIGRAPHIC AND STRUCTURAL FRAMEWORK 255 sions because of the many new road cuts and quarry oper­ REGIONAL TECTONIC SETTING ations that have been added to the data base in the interven­ ing years. The Ordovician rocks of the Head Lake-Burleigh Falls area form a small part of the St. Lawrence Platform, a major The principal focus of the present field investigation was tectonic province of relatively flat lying Paleozoic strata that centred on the stratigraphie and structural framework of the trend northeastward from the Great Lakes region of Canada Ordovician rock units where exposed along the Paleozoic- and United States, through the Ottawa - Québec Lowland Precambrian contact and immediately adjacent
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