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Ratcliffe, L.M. 2019. Geological and geochemical data from Marks Township, Shebandowan greenstone belt, Wawa–Abitibi terrane, northwestern Ontario; Ontario Geological Survey, Miscellaneous Release—Data 376.
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These data accompany:
Preliminary Map P.3830, Precambrian Geology of Marks Township, Shebandowan Greenstone Belt, Wawa–
Abitibi Terrane, Northwestern Ontario, scale 1:20 000.
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Miscellaneous Release—Data 376
Geological and Geochemical Data from Marks Township, Shebandowan Greenstone Belt,
Wawa–Abitibi Terrane, Northwestern Ontario
by L.M. Ratcliffe
This publication can be downloaded from
http://www.geologyontario.mndm.gov.on.ca/mndmaccess/mndm_dir.asp?type=pub&id=MRD376 This digital data release consists of field data (station data, lithological data, structural data), sample data (whole-rock geochemical data and petrographic data) and field photographs (main rock types and geological relationships) obtained during bedrock geological mapping in 2016 and 2017, at a scale of 1:20 000, in Marks Township within the Shebandowan greenstone belt, northwestern Ontario. This release comprises 48
photographs (as .jpg files), 3 Microsoft® Excel® 365 (.xlsx) files and 4 documents in portable document format
(.pdf). These data augment Preliminary Map P.3830, Precambrian Geology of Marks Township, Shebandowan Greenstone Belt, Wawa–Abitibi Terrane, Northwestern Ontario; the marginal notes and the geological legend for this map are also included in this release.
Data are organized into 3 folders: 1. Field Data
2. Geochemistry and Petrology
1. Field Data. This folder contains 1 Microsoft® Excel® 365 (.xlsx) workbook file.
MRD376_Marks_Field-Data-2016-2017.xlsx consists of 10 worksheets of information collected by
L.M. Ratcliffe and field assistants during the summers of 2016 and 2017 as part of bedrock geological mapping in 2016 and 2017, at a scale of 1:20 000, in Marks Township. Locations are provided as Universal Transverse Mercator (UTM) co-ordinates using North American Datum 1983 (NAD83), Zone 16.
“Alteration” worksheet contains alteration data for rocks with alteration observed at the outcrop while in the field. The data was collected using a customized ESRI® ArcPad® application on a portable
computer (Trimble® Juno™ SB handheld global positioning system (GPS) device). The data set
includes alteration identifier, form, texture preservation, mineral, colour and notes describing the alteration. The terminology used in this work sheet corresponds to those in Muir et al. (2016). “Intrusive” worksheet contains lithological data for rocks classified as intrusive based on outcrop
observations while in the field. The data was collected using a customized ESRI® ArcPad® application
on a portable computer (Trimble® Juno™ SB handheld global positioning system (GPS) device). The
data set includes lithology identifier, rock class, rock subclass, rock type, observed minerals, occurrence, metamorphic grade, colour index, colour, rock fabric, form, crystal size, crystal form, phenocryst, groundmass, megacrysts, glomerocryst and notes describing the rock. The terminology used in this work sheet corresponds to those in Muir et al. (2016).
“Mineralization” worksheet contains mineralization data for rocks with mineralization identified at the outcrop, while in the field. The data was collected using a customized ESRI® ArcPad® application on a
portable computer (Trimble® Juno™ SB handheld global positioning system (GPS) device). The data
set includes mineralization identifier, form, mineral type, mineral, and notes describing the
mineralization. The terminology used in this work sheet corresponds to those in Muir et al. (2016). “Photo” worksheet contains photograph information for outcrops mapped in Marks Township during the
summers of 2016 and 2017. The data was collected using a customized ESRI® ArcPad® application on
a portable computer (Trimble® Juno™ SB handheld global positioning system (GPS) device). The data
set includes the numerical photo range of photos taken at each outcrop.
“Sample” worksheet contains sample data for samples collected from rocks in Marks Township during the summers of 2016 and 2017. The data was collected using a customized ESRI® ArcPad® application on
a portable computer (Trimble® Juno™ SB handheld global positioning system (GPS) device). The data
set includes station identifier, lithology identifier, sample identifier, sample type, analysis and notes on the sample. The data set also indicates whether the sample collected was submitted for geochemical analysis and/or thin section and petrographic analysis.
“Sediment” worksheet contains lithological data for rocks classified as terrigenous clastic sedimentary rocks and chemical sedimentary rocks based on outcrop observations while in the field. The data was collected using a customized ESRI® ArcPad® application on a portable computer (Trimble® Juno™ SB
handheld global positioning system (GPS) device). The data set includes lithology identifier, rock class, rock subclass, rock type, observed minerals, occurrence, metamorphic grade, colour, rock fabric, bedding information, grain size, sorting and notes describing the rock. The terminology used in this worksheet corresponds to those in Muir et al. (2016).
notes of each feature. The symbol abbreviations in this worksheet correspond to those listed in Jackson, Muir and Romkey (1995, 2010).
“VolFlow” worksheet contains lithological data for rocks classified as volcanic flows based on outcrop observations while in the field. The data was collected using a customized ESRI® ArcPad® application
on a portable computer (Trimble® Juno™ SB handheld global positioning system (GPS) device). The
data set includes lithology identifier, rock class, subclass, rock type, observed minerals, occurrence, metamorphic grade, colour, rock fabric, form, crystal size, crystal form and notes describing the rock. The terminology used in this work sheet corresponds to those in Muir et al. (2016).
“VolPyro” worksheet contains lithological data for rocks classified as volcaniclastic and epiclastic based on outcrop observations while in the field. The data was collected using a customized ESRI® ArcPad®
application on a portable computer (Trimble® Juno™ SB handheld global positioning system (GPS)
device). The data set includes lithology identifier, rock class, rock subclass, rock type, observed minerals, occurrence, metamorphic grade, colour, rock fabric, ash particle description, lithic fragment description, bedding, and notes describing the rock. The terminology used in this work sheet
corresponds to those in Muir et al. (2016).
2. Geochemistry and Petrology. This folder contains 1 Microsoft® Excel® 365 (.xlsx) file and 2 portable
document format (.pdf) file.
MRD376_Marks_Geochemistry-XRD-Petrology.xlsx consists of 5 worksheets that contain the results of all geochemical analyses performed at the Geoscience Laboratories (Geo Labs), Ontario Geological Survey, Sudbury, for samples collected in Marks Township in addition to petrographic descriptions and X-ray diffraction (XRD) results
“Geochemistry and Petrology” worksheet includes 3 sections; 1) sample information, 2) geochemical classifications and 3) geochemical data.
“Sample Information” section includes job identifier, sample identifier, lithology identifier, station identifier, map code, mineralization, field name for rock type, petrographic description, field description, and location data (“Easting”, “Northing” and “Township”), for each sample collected; UTM co-ordinates are provided in NAD83, Zone 16.
“Geochemical Classification” section includes the classification of each sample based on how it plotted on the following geochemical classification diagrams: Jensen Classification Plot (Jensen 1976), Basalt Discrimination Diagram (Pearce 1996), Total Alkali-Silica Diagram (LeBas et al. 1986), AFM Diagram (Irvine and Baragar 1971) and finally, QAP Diagrams (Streckeisen 1967) using modal percentages calculated from CIPW normalization (Johannsen 1931) and X-ray diffraction results from analysis completed at Geo Labs.
“Geochemical Data Analysis” section includes geochemical data analyses for major and trace elements (and oxides), specific gravity and loss-on-ignition values; assay analyses for gold, platinum and palladium are also included. The methods used, lower detection limit for each method, and reported units for each method are included for each element (and oxide) listed. “Petrology Samples-No Geochemistry” worksheet includes petrographic descriptions for samples that did
not have corresponding geochemical data. Note petrographic (thin section) description of samples with geochemistry are found in the Sample Information section of the Geochemistry and Petrology
worksheet.
“XRD” worksheet shows the results of the modal percentage of minerals analyzed with X-ray diffraction using the Reitveld Method (Reitveld 1969).
“Abbreviations and Sources” worksheets summarize all of the abbreviations and references used in the workbook.
Geolabs Brochure 2016.pdf describes the analytical methods used at the Ontario Geological Survey Geoscience Laboratories for samples collected in 2016.
Geolabs Brochure 2017.pdf describes the analytical methods used at the Ontario Geological Survey Geoscience Laboratories for samples collected in 2017.
3. Geology. This folder contains 1 Microsoft® Excel® 365 (.xlsx) file, 2 portable document format (.pdf) files
related to a map associated with this project, and 1 folder containing 14 subfolders with a cumulative 47 field photographs and 1 micrograph. A preliminary report on the geological mapping of Marks Township was published by Ratcliffe (2016) and Ratcliffe and Wroblewski (2017); these reports are related to this project but are not provided herein.
“PhotoCaptions.xlsx” consists of 1 worksheet that contains descriptions of the photos included in the folder “MRD376_MarksPhotographs”. The photos are subdivided into folders by rock unit:
• Unit 2: Mafic Metavolcanic Rocks • Unit 3: Intermediate Metavolcanic Rocks • Unit 4: Felsic Metavolcanic Rocks • Unit 5: Chemical Metasedimentary Rocks
• Unit 6: Terrigenous-Clastic Metasedimentary Rocks • Unit 7: Epiclastic Metasedimentary Rocks
• Unit 10: Terrigenous-Clastic Metasedimentary Rocks • Unit 12: Mafic Meta-Intrusive Rocks
• Unit 13: Intermediate to Felsic Meta-Intrusive Rocks
• Unit 14: Felsic to Intermediate to Mafic Meta-Intrusive Rocks • Unit 15: Mafic Meta-Intrusive Rocks
• Unit 17: Paleo-Proterozoic Metasedimentary Rocks • Gold and Amethyst Occurrences, and
• Geochronology Samples and Structural Interpretation at Station 17LMR031.
Folder “MRD376_MarksPhotographs”. As described above in PhotoCaptions.xlsx this folder contains 14 subfolders subdividing the photos based on rock unit, occurrence, and geochronology and structural interpretation.
residual magnetic field. Table 1 summarizes the diamond-drill core data; Table 2 summarizes the geochronological data; and the “Occurrences” table lists the main mineral occurrences in the township.
References
Irvine, T.N. and Baragar, W.R.A. 1971. A guide to the chemical classification of the common volcanic rocks; Canadian Journal of Earth Science, v8., p.523-548.
Jackson, S.L., Muir, T.L. and Romkey, S.W. 1995. A library of digital bedrock mapping symbols. Part 1: Figures and descriptions; Ontario Geological Survey, Open File Report 5909, 56p.
——— 2010. Digital bedrock mapping symbols; Ontario Geological Survey, Miscellaneous Release—Data 252. Jensen, L.S. 1976. A new cation plot for classifying subalkalic volcanic rocks; Ontario Division of Mines, Miscellaneous
Publication 66, 22p.
Johannsen, A. 1931. A descriptive petrography of the igneous rocks, Volume 1: Introduction, textures, classification, and glossary; Journal of Geology, v.40, p.182-185.
Le Bas, M.J., Le Maitre, R.W., Streckeisen, A. and Zanettin, B. 1986. A chemical classification of volcanic rocks based on the total alkali–silica diagram; Journal of Petrology, v.27, p.745-750.
Muir, T.L., Buse, S., Trowell, N.F. and Duguet, M. 2016. A library of standards for rock names, rock modifiers and terms related to structure, alteration, mineralization and minerals for Precambrian rocks in Ontario; Ontario Geological Survey, Open File Report 6289, 204p.
Pearce, J.A. 1996. A user’s guide to basalt discrimination diagrams; in Trace Element Geochemistry of Volcanic Rocks: Applications for Massive Sulphide Exploration, Geological Association of Canada, Short Course Notes Volume 12, p.79-113.
Ratcliffe, L.M. 2016. Preliminary results from geological mapping in Adrian and Marks townships, Shebandowan greenstone belt, Wawa–Abitibi terrane; in Summary of Field Work and Other Activities, 2016, Ontario Geological Survey, Open File Report 6323, p.12-1 to 12-14.
——— 2017. Precambrian geology of Adrian Township, Shebandowan greenstone belt, Wawa–Abitibi terrane; Ontario Geological Survey, Preliminary Map P.3813, scale 1:20 000.
——— 2019. Precambrian geology of Marks Township, Shebandowan greenstone belt, Wawa–Abitibi terrane, northwestern Ontario; Ontario Geological Survey, Preliminary Map P.3830, scale 1:20 000.
Ratcliffe, L.M. and Wroblewski, J.B. 2017. Preliminary results from geological mapping in Marks Township,
Shebandowan greenstone belt, Wawa–Abitibi terrane; in Summary of Field Work and Other Activities, 2017, Ontario Geological Survey, Open File Report 6333, p.13-1 to 13-12.
Rietveld, H.M. 1969. A profile refinement method for nuclear and magnetic structures; Journal of Applied Crystallography v.2, p.65-71.
Streckeisen, A. 1967. Classification and nomenclature of igneous rocks; Neues Jahrbuch für Mineralogie, v.107, p.144-240. Young, R.A. ed. 1995. The Rietveld Method. International Union of Crystallography. Monographs on Crystallography 5;
