DP 051 Geological report, Portneuf and parts of St-Raymond and Lyster map-areas, Portneuf and Lotbinière counties I MINISTÉRE DE L'ÉNERGIE ET DES RESSOURCES DIRECTION GENERALE DE L' EXPLORATION GEOLOGIQUE ET MINERALE l i PORTNEUF AND PARTS OF ST-RAYMOND AND LYSTER MAP AREAS \s. T.H. Clark Y. Globensky 1969 DP-51 Province of Quebec, Canada DEPARTMENT OP NATURAL RESOURCES Paul L. Allard, idinister P.—E. Auger, Deputy Minister GEOLOGICAL EXPLORATION SERVICE ROBERT BERGERON, Director Geological Report PORTREUP AND PARTS OP ST—RAYMOND AND LYS TER MAP—AREAS PORTNEUF AND LOTBINIERE COUNTIES by T. H. CLARE and YVON GLOBENSKY Ministère des Richesses Naturelles, Québec SERVICE DE LA QUEBEC DOCUMENTATION TECHNIQUE 1969 30 JUIL 19-ti Date: No GM: 2 0 in Jli• TABLE OF CONTENTS Page INTRODUCTION / Location . • . Topography and Drainage . 3 Area n:orth of the St. Lawrence River 3 Area south of the St. Lawrence River Culture, TransportaLion . Area north of the St. Lawrence. River Area south of the St. Lawrence River GENERAL GEOLOGY RESUME OP EARLIER WORKS AC EMU EDGE1ENTS . . • . ~-, PRECAMBRIAN ROCKS IN THE PORTNEUP AREA. (by P. P. Osborne) . /Sf Gray Gneisseo . • • . ./s" Structures of the gray gneisses /s' Petrography /l Îetasoinatism /7 Origin of the gray gnei ss es f, Gabbro za Pegmatite dikes Pink granite . • 2/ PALEOZOIC STRATIGRAPTY • . • . 2/ Nomenclature of the stratigraphie units . Formations northwest of the Champlain fault zone ••• • • • Z4 ii. TABLE OP COUTEI.:TS (continued) Page The Black River Group • r • -24r The Trenton Group . o • • • . • . . • • General Description . • • . ;~ 9 Distribution The Renville Exposures • . • . • . 3/ Feschambc.ult Formation • 3z Renville Formation . • ~ ~ St-Caeimir Member 39 Fauna of the St-Casimir Member • • • . 37 Grondines Member Fauna of the Grondines Member . • . • Renville shore . • • . • . • • Jacques Cartier River Exposures . .~~ Pont Rouge Formation Peschambault Formation Desehambault Exposures . • . • • s / St-Casimir Member . • . SZ e-3 Miscellaneous Localities Paleontology . • S~ Subsurface distribution Correlation . • . THE UTICA GROUP • . • . 55-tg Lotbinïbre t Shale Formation Distribution 5.8 sy Lithology • • . • • . • . • . • Thickneas• . • •., . (;41 TABLE OP CONTENTS (continued) Page Paleontology . , . ~ . Correlation . , . • . y LORRAINE GROUP , i/ Nieolet River Formation ' .' + 7/ Chambly Member (Proetu_s and.Leutaena zones) 7/ Breault Member (Crvsto7,ithus zone) . : 74 r~-~ RICHMON13 GROUP r~,.~ Bécancour River Formation . PontgravC River Formation . ~ J Formation southeast of the Champlain fault .L5'5/ Sillery Group . Sillery slates and sandstones • . • • eS/ L6vio Group . 3 s- IIurette Formation . ° j- Itormanskill Correlative . . .B 7 Laurier Group , . . 9 Bourret Formation ~7 Aubin Formation . • 6 9' Paleontology ?/ Igneous Rocks . • • . , . St_Plavien • ~ o~n+C~k7i~..[w~ i . G .} STRUCTURAL GEOLOGY Paleozoic—Precambrian sedimentary contact . • . a . , . Faults . .. 9 Normal faults 97 iv. TABLE OP CONTENTS (continued) •Page The Neuville Pau tF . • • . • • . • . • • . • • • • : 97 The Deschambault Fault . • • • • 4 . • • • /o.' The Portneuf Station Fault • . • . • * //U Jacques Cartier River Power Rouse Fault . • // Transcontinental Railway Fault . • . • . .. /' Cap Santé Structure //2:. The Ste-Emélie Fault .• //S The Champlain Thrust in the area // +O1ds •. •r• •••.•••••..••. ,..•...••••••.•• ,,• .• ••.... •'.,•.•.•,••. //% Chambly-Fortiervi?le syncline and the Cap Sant6 Anticline /2/ ECONOMIC GEOLOGY • . /2 Petroleum and Natural Gas /z Economic Minerals • • . • /2 7 Agricultural Lime and Cement /2 7 Building Stone . /2 P' Road Material • . • /2 7 BIBLIOGRAPHY . •. • • . • . /3 z Appendix I Summary of logs of wells bored in the area. V. LIST OP ILLUSTRATIONS FIGURES Page 1 Index map of part of Québec to show location of the map-area. 2 Generalized geologic map of the map-areas. 3 Correlation chart of deep wells in the Portneuf area. 4 Columnar section of beds in railroad cut 1.5 miles northwest of Neuvilie wharf. 5,. 6 Sketches of two roadside cuts on north side •of Highway r 2,H1.3 miles west of ileuville wharf. 7 Plans and sections of.,Lotbinibre shore to show distribution of buff-weathering beds. • Map of part of Portneuf area to show expected and actual trends of the strata. 8 Lotbinibre shale, showing gentle folds (undulations) Map of Lower part of Grande Riviere du Chêne from near mouth to point 2.5 miles (straight line) upstream. Shows gentle undulations indicative of the Cap Santé axis. 10 Locations of' Bourret Brook section and of Lambert Quarry. 11 Illustrations of exposures of St-Plavien igneous rocks, showing faults and intrusive contacts. 12 Section of Trenton limestone .5 mile northeast of Neuville wharf. 13 Diagram to illustrate how the maximum and minimum vertical displacements along the Neuville fault may be arrived at 14 a) Plan of a detail along Neuville fault. 1,500' northeast of Neuville wharf. b) Sections across Neuville fault. Shore of St. Law- rence River, same localities as 14 a c) Section across Beschambault fault, 1.5 miles west of Lesehambault. ~v5 LIST (Jr ILLUSTRATIONS (continued) Page 15 Nap and section's of faulted area a mile west of Portneuf Station. 16 a.b. Views across Jacques Cartier river showing the two faults one mile south of the north margin of the map area. 17 Map showing attitudes of Utica shales along chore of St. Lawrence west of Cap Sang; wharf, 18 Map showing attitudes of Trenton limestone along shore of St. Lawrence one mile west of Neuville 19 Illustrations of Bourret Formation structures in shales on the eastern limb of the Chambly-F'ortierville syncline to show the stronger folding characteristic of that limb. TABLES Chemical:an:alysis of Fiole / 9 on Drolet Property, at Neuville. Chemical ^si-ilysis of Hole 10 on Darveau Property at Neuville. MAPS 1 _ Geologic map of the area 2 - Bourret Brooks Section 1. INTRODUCTION The Paleozoic rocks of the Portneuf map-area were mapped by T.H. Clark during the summers of 1944 and 1948. The Precambrian rocks were later mapped by F.F. Osborne in 1948. The area was revisited by Yvon Globensky during the summers of 1967 and 1968, and several exposures, mainly from newly dug agricultural ditches, were added to the original map.. The mapping was done for the most part on enlargements of the Portneuf topographic map. Air photographs were available for the 1967 work and allowed the mapping in detail of the structures visible on the beach at low tide, permitting a better comprehension of the structural arrangement along the St. Lawrence river. ,The aeromagnetic and gravity maps of the area contributed to the recognition of normal faults in the area. The work done in the adjacent area to the east (St-Nicolas map-area) by Pierre St-Julien and F.F. Osborne, helped considerably in working out the rock distribution and structure in the southeastern corner of the pârsent area. The mapping was extented to the north by Clark along Jacques Cartier river into the St-Raymond map-area as far as the Precambrian. contact. Location The map-area straddles the river St. Lawrence just above Québec City; approximately one-third of its area lies to the north of the river, and two-thirds to the south. Its v x`~ c",„'t., r. • ,•":"':1 - .f" • .. -0'2 • ' 0 r i~~ .,.,.e k;t.3 ...."-- -,i 3~'a C '' ~..,~.,...r.,,.â _~l_`_' __...v ~ . gti~ e~ ~~ ~.çeE .-;~' ~~/Le ,~, 7~7- _7 a,~c,\!):?'•~a (s~r s ~ A eg r~~/ r *~. yi I ~ • ,,, 2 Y~,1 •~C~.- i r n1/4.1).• .,...~ ~ ye, ~O~ ~ ~•~ç~ l tr. Sq A „ {;~> ` CJ~1v ----•,.-n.... , . 0 vâ. t'.1.:11 G`f 1. - d. ox map Cf p~.?:i'(l0ï ÿ,~~2r.:'rt':C1 1.; ` a~ k~Us.'v'~1;11::' r~-w•t. `-' ~ _ C,':• \ ?i :.'~il L;?t:LOi".1i tto Tride:c rap of' p2.S` \h 1t of t,~y+.`,ebF i 1114 t!i@ nap -are 3.s C~7d2'ii1~ o!?e i St.. 1..a7 -,‘•,- ? o;,:La. ;-Cambz 1 er.. to the northwest, the . Appa'acnieD. in tain built terra:zs to the .Ci0i1Li1.-^. 3 ve . ~ ✓ ~,I / ---2~ti 4 .oj-~. 2/h-e ~~, G~ Cfit.U ~2. G~6,~U~ ""`~ ` f °/ ~~~~ / y ~,i^j . , .' ~) ~/~ ~ -.-4.____.A.,_(: .._69.-2-\ J ~ ~~ .777/At. ~;• ~ ~ ~~/~ Y/~ ./.„i)a,A., ..,c?,- C a.-14 , ' ------2---2i __ c:~~ f l ~~e~ ..,e,„1,,14..2.3 -r) .eC~:~;~rc 7../to_- 4 .A4-e- S>r. /— etAA,A1—,,e_t_ ,40—t-c.,LIA,,,4, --e^ CO-L,1/4.e:Ge, Ge position with regard to the neighboring map-area is shown on the accompanying index map (Fig. 1). It is bounded by latitudes 46° 15' and 46°50' and by longitudes 71030' and 72° W. Only the northwestern half of the Lyster map-area was mapped. The combined area covers approximately 728 squares miles. Topography and Drainage Area north of the St.-Lawrence river Except for two hilly areas near the northeastern and northwestern corners of the Portneuf map-area, the part here considered consists of a plain, gently sloping southward, and dropping from a maximum elevation of about 300 feet to the edge of the St. Lawrence) where it ends in an escarpment 100-200 feet high. Flat lands bordering the river are for the most part confined to a narrow marginal belt a few hundred feet wide; they are extensive only in the extreme eastern part of the area. The hilly regions referred to are underlain by Precambrian rocks. They rise to 450 and 500 feet respectively in the Portneuf area but are much higher in the St-Raymond area and, in an otherwise monotonous landscape, give an illusion of considerable relief. The Jacques Cartier river, the only large stream, flows for more than half :its length through a gorge with precipitous sides up to 100 feet high. The Portneuf river, though much smaller, is important enough to provide power for two factories. ~. Area south of the St. Lawrence Except for some irregularities near the eastern limits, this area is a plateau rising gently toward the southeast from the nearly sheer rivers side cliffs.