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REGION DU MONT ALBERT 9/JZ9/ Zdt#/R GOUVERNEMENT I DES R CHESSES NATURELLES // ~~Lr.Syararre~R YJO~.O~•Lyt.Flj~L.R1r//!//Ls/~(

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REGION DU MONT ALBERT 9/JZ9/ Zdt#/R GOUVERNEMENT I DES R CHESSES NATURELLES // ~~Lr.Syararre~R YJO~.O~•Lyt.Flj~L.R1r//!//Ls/~( ES 019 GEOCHIMIE DES SEDIMENTS DE RUISSEAUX - REGION DU MONT ALBERT 9/JZ9/ Zdt#/r GOUVERNEMENT I DES R CHESSES NATURELLES // ~~lr.SYararre~r YJO~.O~•lYt.flJ~l.r1r//!//ls/~( .. A/DIRECTION GENTRALE DES MINES r / / E.S.-19 GEOCHIMIE DES SEDIMENTS DE RUISSEAU Region du MONT ALBERT Area STREAM SEDIMENT GEOCHEMISTRY R.L.Tremblay G.H.Cockburn J.P.Lalonde DIVISION DE GÉOCHIMIE e7f RVICE DES G TES MI QUEBEC 197 ERRATUM 1 - Sur la légende de la carte, lire 1V au lieu de lb On the map legend, read 1V instead of lb 2 - Sur la carte, lire 7V au lieu de 6V On the map, read 7V instead of 6V MINISTÈRE DES RICHESSES NATURELLES DU QUEBEC DIRECTION GENERALE DES MINES E.S.-19 GÉOCHIMIE DES SEDIMENTS DE RUISSEAU Region du MONT ALBERT Area STREAM SEDIMENT GEOCHEMISTRY R.L.Tremblay G.H.Cockburn J.P.Lalonde DIVISION DE GE°OCHIMIE QUEBEC 1975 TABLE DES MATIERES TABLE OF CONTENTS Page Page INTRODUCTION 1 INTRODUCTION 1 Environnement 1 Environment 1 Remerciements 2 Acknowledgments 2 CADRE GEOLOGIQUE 3 GEOLOGIC SETTING 3 Zones tectoniques 3 Tectonic zones 3 Intrusions 5 Intrusions 5 Déformations 6 Deformations 6 Dépôts meubles 6 Sedimentary cover 6 Minéralisation . 8 Mineralization 8 Géophysique 8 Geophysics 6 GEOCHIMIE 10 GEOCHEMISTRY 10 Echantillonnage 10 Sampling projects 10 Analyses 11 Analyses 11 Traitement des données 13 Data processing 13 OBSERVATIONS ET CONCLUSION 14 OBSERVATIONS AND CONCLUSION 14 BIBLIOGRAPHIE 16 BIBLIOGRAPHY 16 ANNEXE - AIRES ANNOTEES 18 APPENDIX - ANNOTATED AREAS 18 TABLEAUX TABLES 1 - Principaux gisements de la 1 - Principal deposits of the région du mont Albert 9 Mount Albert area 9 2 - Index des échantillonnages . 10 2 - Index of sampling projects 10 3 - Echantillons de 1972 - limi- 3 - 1972 samples - analytical tes de détection et de pré- accuracy and detection limits cision des analyses 12 12 4 - Méthodes d'analyses utili- 4 - Methods used for analysing sées pour doser les échantil- the samples collected from lons de 1964 à 1969 12 1964 to 1969 12 ILLUSTRATIONS ILLUSTRATIONS CARTES (en pochette) MAPS (in pocket) 1814 - Localisation des échantil- 1814 - Sample location lons 1814 - Cuivre 1614 - Copper 1814 - Zinc 1814 - Zinc 1814 - Plomb 1814 - Lead 1814 - Nickel 1814 - Nickel 1814 - Cobalt 1814 - Cobalt 1814 - Uranium 1814 - Uranium FIGURES FIGURES 1 - Géologie du Quaternaire de 1 - Quaternary geology of the la région du mont Albert .... 7 Mount Albert area 7 2 - Localisation des échantil- 2 - Location of sampling pro- lonnages 11 jects 11 INTRODUCTION INTRODUCTION La région de la Gaspêsie,comme Gaspesia, as well as the en- toute la chaîne des Appalaches du Qué- tire Appalachian System of Québec is bec, se prête bien à l'exploration géo- particularly amenable to geochemical chimique par la méthode des sédiments exploration by means of stream sedi- de ruisseau. C'est pourquoi, la divi- ment sampling. This fact was undoubt- sion de Géochimie s'est vue attribuer edly a major consideration of the par l'Office de Développement de l'Est Eastern Québec Development Office in du Québec (O.D.E.Q.) les fonds néces- allocating the funds necessary for the saires pour amorcer un programme d'in- Geochemistry Division to undertake a ventaires géochimiques de toute la pé- geochemical inventory of the entire ninsule gaspésienne par des relevés de Gaspé Peninsula by a series of stream sédiments de ruisseau. sediment surveys. La région du mont Albert, qui The Mount Albert area, which fait l'objet de ce rapport, a été choi- is the subject of this report, was sie pour le premier de ces inventaires chosen as the first survey area pri- en considération de son activité miniè- marily because of its mining activity, re présente et passée et de son con- both past and present, and because of texte géologique favorable A l'explo- its favorable geologic context. ration. ENVIRONNEMENT ENVIRONMENT Le territoire échantillonné, The area sampled covers appro- qui couvre environ 1300 kilomètres ximately 1300 square kilometres between carrés entre les latitudes 48045' et latitudes 48°45' and 49004' and longi- 49°04' et les longitudes 66°00' et tudes 66°00' and 66°30', and is located 66°30' , se situe à 14 milles au sud 14 miles south of the town of Sainte- de la ville de Sainte-Anne-des-Monts. Anne-des-Monts. It is part of a tem- Il fait partie d'une zone climatique perate climatic zone which could best tempérée qui pourrait être qualifiée be described as continental-humid. The de continentale humide. La tempéra- mean annual temperature varies between ture annuelle moyenne varie entre 00 00 and -2°C and the average precipi- et -2°C et la précipitation moyenne tation ranges between 100 and 140 cm, entre 100 et 140 cm, dont approximati- of which approximately one third falls vement le tiers en neige (Gagnon, as snow (Gagnon, 1970). Mount Albert, 1970). Le mont Albert, qui se situe located in the center of the area, is au centre du territoire, est un îlot an outlier with a subarctic climate A climat et faune subarctiques (toun- and fauna (tundra). dra). La topographie est très acci- The topography is rugged. The dentée. L'élévation minimum (75 m) se lowest point encountered (75 m) is in trouve dans le nord-ouest de la région the northwestern part of the area; the et le point le plus élevé est le sommet highest is the summit of Table mount- du mont de la Table (1150 m). En géné- ain (1150 m). Generally, the relief ral, la dénivellation varie entre 150 varies from 150 to 515 metres. et 515 mètres. La région est recouverte d'un The area is densely forested, épais manteau végétal formé surtout primarily by white spruce. The drain- d'épinette blanche. Le système de age system is well developed. Two drainage est très bien développé. La rivers are of importance: the Sainte- rivière Sainte-Anne, coulant vers le Anne river which flows north and the nord, et la rivière Cascapédia, coulant Cascapédia river which flows south. vers le sud, sont les deux principaux cours d'eau de la région. L'accès dans la région se li- Access within the map-area mite à la route trans-gaspésienne qui is limited to the Trans-Gaspé Highway suit la vallée de la rivière Sainte- which follows the Sainte-Anne river Anne et à quelques chemins servant è and to a few forestry roads. l'exploitation forestière. REMERCIEMENTS ACKNOWLEDGMENTS Les auteurs remercient sincère- The authors wish to thank the ment le personnel de la division de Géo- personnel of the Geochemistry Division chimie qui a collaboré à la préparation who collaborated in the preparation of de ce rapport: les géologues P. Gilbert, this report: geologists P. Gilbert, J. Choinière et M. Beaumier; les tech- J. Choinière and M. Beaumier; techni- niciens A. Marquis, J. Gilbert et F. cians A. Marquis, J. Gilbert and F. Kirouac; et Mme O. Beauchemin (secré- Kirouac; and Mrs O. Beauchemin (secre- taire). Ils soulignent également l'ef- tary). They also acknowledge the efforts fort fourni par R. Dumont, Y. Beau- of R. Dumont, Y. Beauchemin and J.L. chemin et J.L. Pelletier, lesquel ont Pelletier in developing the necessary été d'un très grand secours pour la pro- computer programs for processing the grammation du traitement mécanographi- data. Also, the authors sincerely que des données. Ils tiennent en plus à thank the personnel of the Centre de remercier le personnel du Centre de Re- Recherche Minérale who performed the cherche minérale qui a effectué les a- analyses, the personnel of the govern- nalyses, celui du Centre de Traitement ment data processing centre, "Centre électronique des Données ainsi que tous du Traitement électronique des Données" les étudiants d'université qui ont con- as well as all the university students tribué à l'échantillonnage. who participated in the sample collection. - 3 - CADRE GEOLOGIQUE GEOLOGIC SETTING ZONES TECTONIQUES TECTONIC ZONES La région du mont Albert se The Mount Albert area can be subdivise en trois zones géologiques subdivided into three east-west oriented formant des ensembles tectoniques orien- geologic zones, each of which forms a tés est-ouest. Ce sont: distinct tectonic assemblage. These zones are: - au nord, une zone de nappes flys- - in the north, a zone of nappes chiques cambro-ordoviciennes (unités composed of Cambro-Ordovician flysch 3 et 4 sur la carte géochimique). sequences (units 3 and 4 on the geo- chemical map) - au centre, le groupe de Shickshock - in the center, the Shickshock et les roches ultramafiques du mont Group and the Mount Albert ultramafic Albert (unités 1 et 2) mass (units 1 and 2) - au sud, une séquence de roches vol- - in the south, 'a sequence of vol- caniques et sédimentaires formant le canic and sedimentary rocks which form flanc nord du synclinorium Gaspé-Con- the northern limb of the Gaspé-Connecti- necticut Valley (unités 5 à 9) ut Valley Synclinorium (units 5 to 9).c Zone nord Northern zone La zone nord a récemment été The northern zone has recently l'objet d'études stratigraphiques et been the object of detailed stratigra- structurales très détaillées, lesquelles phie and structural studies which show démontrent que le flysch qui longe le that the flysch sequences which paral- Saint-Laurent n'est pas une séquence lel the Saint Lawrence River are not autochtone mais un ensemble de nappes autochtonous but are an assemblage of de charriage qui se chevauchent. overlapping thrust sheets. La formation de Deslandes, en The Deslandes Formation, near bordure nord de la carte, est une sé- the northern edge of the map-area, is quence de siltstones, de grès et de a Middle Ordovician sequence of silt- calcisiltites d'âge ordovicien moyen, dé- stones, grits and calcisiltites which finie et assignée par Biron (1973) à la was defined by Biron (1973) and as- nappe de la riviêre Marsoui.
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