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[email protected] 5691 (inside Canada, United States) Crown Copyright Queen’s Printer Local: (416) 326-2678 Toll Free: 1-800-668-9938 [email protected] (inside Canada, United States) Ontario Department of Mines Geological Branch Open File Report 5004 Geology of Cashel Township 1967 ONTARIO DEPARTMENT OF MINES GEOLOGICAL BRANCH OPEN FILE REPORT No 5004 GEOLOGY OF CASHEL TOWNSHIP HASTINGS COUNTY APRIL 3, 1967 By S.B. Lumb ers I5^$ 9 GEOLOGICAL BRANCH ON T AR10 PARLIAMENT BUILDINGS DEPARTMENT OF MINES TORONTO 2, ONTARIO Open-file Reports Open-file reports are made available to the public subject to certain conditions. Anyone using them shall be deemed to have agreed to these conditions which are as follows: This report is unedited. Discrepancies may occur for which the Department does not assume liability. Open-file copies may be read at the following places: The Library (Room 1433, Whitney Block), Department of Mines, Parliament Buildings, Toronto. The office of the Resident Geologist in whose district the area covered by this report is located. A report cannot be taken out of these offices. Handwritten notes and sketches may be made from it. This particular report is on file in the Resident Geologist's office located at: 500 University Avenue, Toronto. Open-file reports cannot be handed out for office reading until a card, giving the name and address of the applicant, is filed with the Resident Geologist or Librarian. A copy of this report is available for inter- library loan. The Department cannot supply photocopies. Arrangements may be made for photocopying by an outside firm at the user's expense. The Librarian or Resident Geologist will supply information about these arrangements. The right to reproduce this report is reserved by the Ontario Department of Mines. Permis­ sion for other reproduction must be obtained in writing from the Director, Geological Branch. J. E. Thomson, Director, Geological Branch. ONTARIO DEPARTMENT OF MINES GEOLOGY OF CASHEL TOWNSHIP HASTINGS COUNTY By S.B. Lumb ers Geological Report No. 5004 Contents Page Abstract Introduction 1 General 1 Present Geological Survey 1 Acknowledgments 2 Means of Access 2 Natural Resources and Development 3 Previous Geological Work 4 Physiography and Pleistocene Geology 4 Physiography 4 General 4 Relief 5 Drainage 5 Rock Exposure 6 Pleistocene Geology 7 Bedrock Geology 9 Preliminary Statement 9 Metavolcanics and Metasediments 10 General 10 Metavolcanics 11 General 11 Lithology 12 Mafic Met-avolcanics 12 Felsic Metavolcanics 17 Metasediments 19 General 19 Lithology 20 Carbonate-poor Metasediments 20 Page Calcareous Metasandstone and Metasiltstone 21 Carbonate Metasediments 24 Stratigraphy 26 Intrusive Rocks 29 Granitic Rocks and Contaminated Mafic Intrusive Rocks 29 General 29 Weslemkoon Trondhjemite-Granodiorite 30 General 30 Structural Relations 32 Lithology 34 Trondhjemite in Southwestern Cashel Township 38 Mafic Sills and Dikes 33 Late Calcite and Quartz Fissure Veins 40 Comparison of Bedrock Geology to Aeromagnetic Data 41 Y<^— Structural Geology 44 General 44 Folding 44 Faulting 46 Economic Geology 49 Introduction 49 Prospecting and Mining Activity 49 Base and Precious Metal Mineralization 51 Rusty-Weathering Schists 51 Maidens Property 6.F. 53 Gunter Occurrence ^^ Gold, Silver, Lead, Zinc, and Copper 56 Gold and Silver Occurrence, Lot 20, Concession I 57 Cashel Copper Occurrence 5# — /// • Page Galena Occurrence, Lot 29, Concession IV 59 Galena Occurrence, Lot 28, Concession III 60 Iron 60 Nonmetallic Minerals and Industrially Useful Rocks 61 Barite 61 Talc 61 Introduction 61 General Description of the Mineralized Zones 62 Chemistry and Utilization 64 Origin 65 Madoc Talc and Mining Occurrence 66 Marble 67 Grenville Marble Company Pr-oporfty 68 Marl 69 Sand and Gravel 70 Suggestions for Future Exploration 70 References Cited 72 ./V •— Figures (Back pocket) Figure 1. Sketch map of the Pleistocene geology of Cashel township. * 2. Inferred, pre-folding relationship of the metavolcanics and metasediments. * 3. Sketch map showing the generalized structural and lithologic features of the Weslemkoon batholith. * 4. Sketch map showing stratigraphy and structural and metamorphic features of Cashel township. * 5. Sketch map showing distribution of talc mineralization in northern Cashel township. This illustration is not shown in this report because the original drawing is not in suitable form for uncoloured reproduction v List of Tables (Back Pocket) Table 1. Table of formations. 2. Generalized subdivision of the carbonate metasediments in Cashel township. 3. Modal and Chemical analysis of the major rock types of the Weslemkoon batholith in Cashel township. Preliminary Maps * P. 211 Cashel Township, North Half Scale 1 inch to i mile P. 212 Cashel Township, South Half Scale 1 inch to * mile * Preliminary maps may be purchased at Publications Office, Ontario Department of Mines, Whitney Block, Parliament Buildings, Toronto. vii Abstract Cashel township, comprising about 75 square miles,is near the southwestern border of the Grenville province of the Canadian Precambrian Shield. Western and central parts of the township are underlain by a Proterozoic metavolcanic-metasedimentary sequence at least 15,000 feet thick which was regionally metamorphosed to the greenschist facies in the southwestern part of the area and to the lower and middle almandine facies in the central and northern parts of the area. The regional metamorphism culminated after the sequence was folded about northeast-trending axes, but before the emplacement of granitic and mafic intrusive rocks. The metavolcanic-metasedimentary sequence, whose base is unknown, is divided into 4 formations which decrease in relative age from east to west in the area and which can be traced southwestwards and northwards into adjacent townships. A thick formation of mafic and minor felsic metavolcanics forms the lower part of the sequence and grades upward over a few hundred feet into a thin formation composed mainly of felsic and intermediate metavolcanics.