Identification_Information: Citation: Citation_Information: Originator: Jackson, G.D. Publication_Date: 2006 Title: Hantzsch River Area, Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open File Issue_Identification: 4202 Publication_Information: Publication_Place: Ottawa, Ontario Publisher: Geological Survey of Canada, Natural Resources Canada Other_Citation_Details: Recommended citation: Jackson, G.D. 2006: Geology, Hantzsch River Area, Baffin Island, Nunavut; Geological Survey of Canada, Open File 4202, scale 1:250 000. Online_Linkage: Description: Abstract: This report consists of a coloured map of bedrock geology at a scale of 1:250 000 with a legend, marginal notes, references, two figures and two photographs. The map area lies between 70°-74° 25' W. Long. and 67° - 68° N. Lat. and is part of a much larger region in which the bedrock was mapped for the first time in 1970 by a Geological Survey of Canada helicopter reconnaissance project. Most of the field data for this report was gathered on that project. The area has no permanent settlements and the closest airstrip is ca. 70 km north of the area and is unmanned. Highest elevations are about 460 m. in the northeast corner of the map area. Eskers and drumlins are most abundant and well developed in the southwest part of the map area. They and a few glacial stria indicate mainly a southwesterly ice flow. The map area lies along the north side of the Cumberland Batholithic Complex, the core of the Baffin Orogen, a major part of a large orogenic node in the northeast extension of the middle Paleoproterozoic Trans-Hudson Orogen (Fig. 1). The complex is flanked to the north by the Foxe Fold Belt which contains the main body of the Piling supracrustal group and its Archean basement which underwent middle Paleoproterozoic orogenesis together. Archean basement has not yet been identified within ca. 40 km north of the northern boundary of the map area. However, belts and irregular bodies of undifferentiated Archean or/and Paleoproterozoic bedrock occupy about 15% of the area.. The unit contains mostly layered quartzofeldspathic gneisses, that may include a high proportion of high-grade Piling Group. It also contains gneissic plutons that range mostly from granitic to quartz diorite or diorite composition, some younger tabular granitic bodies. and a few small metamorphosed mafic bodies, The early-middle Paleoproterozoic supracrustal Piling Group (ca. 2.16-1.9 Ga) is one of three coeval supracrustal groups in fold belts that border most of the Cumberland Batholithic Complex. Ages of most, not all, dated detrital zircons from the group north of the map area are compatible with a proximal source. The group, including its migmatized eqivalent, occupies about one quarter of the Precambrian terrane in the map area and seems continuous with the group to the east and north..Group stratigraphy, best known to the north, contains 5 sharp to gradational conformable formations that are tentatively considered to extend into the map area The lower part of the group is a relatively thin, discontinuous stable shelf sequence that is represented in the map area by several small bodies of the Dewar Lakes Formation that contain mostly leucocratic quartzofeldspathic paragneiss, meta-arkose and local quartzite. Shelf deposition was interrupted and terminated by rifting and emplacement of two conformable formations. The lower, Bravo Lake Formation, is relatively localized and appears to be discontinuous. It contains mafic-ultramafic sills and-or flows and associated immature metamorphosed shales-sandstones. Chemical analyses from samples from north of the map area suggest some of the mafic-ultramafic rocks may be related to mantle plume activity. The upper, Astarte River formation, contains more widespread metasediments that are similar to but less varied than those in the Bravo Lakes Formation. The metasediments in both units are commonly sulphide- bearing or ferruginous and include sulphide- and oxide-facies iron-formations. These two units represent a transition from the underlying shelf sequence, to the overlying basin or trough, thick turbiditic flysch sequence of the Longstaff Formation that forms the bulk of the Piling Group. The Cumberland Batholithic complex (mostly 1.87-1.85 Ga) occupies most of the map area. Most of it is massive to foliated and locally layered, syenocharnockite - monzocharnockite (hypersthene-bearing syenogranite and monzogranite) in the eastern part of the map area and pink syenogranite- monzogranite in the western part. Intermediate to mafic rocks occur locally. Other map units in the complex are minor. All units have been intruded throughout by minor white and pink granitic and aplitic dykes and pegmatites and locally by a few small quartz diorite,amphibolite and pyribolite dykes. Potassium feldspar phenocrysts are abundant, minor garnet and traces of graphite are present in most units. Sparse inclusions are common, locally,range up to 50 % of the bedrock, have a wide range in size and most appear to be from the Piling Group. The plutons range from obvious intrusions to bodies that are interpreted to have formed mostly from the Longstaff Bluff turbidites, either by melting and assimilation and by recrystallization to charnockite in situ. Some U-Pb and Sm-Nd data suggest the presence of Archean inherited material. Chemical data indicate that the plutonic rocks contain more K and Na than the Archean plutons to the north and include both S- and I-type granites. Small remnants of deformed and metamorphosed amphibolite-pyribolite dykes and sills of uncertain age throughout the metamorphic terrane may range in age from Archean to middle Paleoproterozoic age depending on the host rock. Northwest-trending unmetamorphosed Neoproterozoic Franklin tholeiitic diabase dykes (723 Ga) occur throughout the Precanbrian terrane. Southeasterly to east and northeasterly trends predominate in the Precambrian terrane in which broad areas of plutonic rocks of the Cumberland Batholithic Complex are partially to completely rimmed by narrow irregular belts of the Piling Group and undifferentiated gneissic rocks. The Piling Group commonly cotains horizontally stacked and en echelon folds, some of which are truncated at belt margins. Belt- parallel faults and shear zones are common. Most post folding faults (Mesoproterozoic-Recent) are subparallel to the northeast coast of Baffin Island.. The map area is in the northern part of a large region characterized by low pressure- high temperature dominantly granulite facies metamorphism( 4-7 kbar, 610-810oC) and some of the area may have been at the low end of the temperature range noted. Although several episodes of deformation and metamorphism have been recognized north of the map area, the peak of metamorphism is interpreted to have occurred largely after the main deformation. Pluton emplacement and granulite metamorphism seem to be penecontemporaneous and to owe their origin to the same heat source, which may have included a mantle plume. Field relations indicate that both regional and contact metamorphism is present. Rusty sulphide-bearing schists (sulphide iron-formation?), a few areas containing aeromagnetic anomalies (oxide facies iron-formation?) and the area contaning the Bravo Lake Formation may be of possible economic interest. The Boas Formation, known to contain "oil shale" and bituminous limestione elsewhere, has been interpreted by others to be present on Airforce Island. Purpose: Supplemental_Information: Data set is in English. Magnetic declination stated in degrees and minutes. Annual change stated in minutes. Magnetic declination at NW corner of map: 36°27'W, changing 39.7'E annually. Magnetic declination at SW corner of map: 34°47'W, changing 37.1'E annually. Magnetic declination at NE corner of map: 38°51'W, changing 38.7'E annually. Magnetic declination at SE corner of map: 37°9'W, changing 36.5'E annually. Magnetic declination at center of map: 36°53'W, changing 38.3'E annually. Number of base data sets used: 2 Base data set 1: Source is NTDB, ID is 26/M, scale 1:50000 Base data set 2: Source is NTDB, ID is 36/P, scale 1:50000 Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2002 Range_of_Dates/Times: Beginning_Date: 1968 Ending_Date: 2002 Currentness_Reference: Field work years are 1968,1970,1975. Compilation years are 2002. Status: Progress: Complete Maintenance_and_Update_Frequency: None Planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -75.000 East_Bounding_Coordinate: -70.000 North_Bounding_Coordinate: 68.000 South_Bounding_Coordinate: 67.000 Data_Set_G-Polygon: Data_Set_G-Polygon_Outer_G-Ring: G-Ring_Point: G-Ring_Latitude: 68.0021 G-Ring_Longitude: -74.9991 G-Ring_Point: G-Ring_Latitude: 68.0021 G-Ring_Longitude: -69.9986 G-Ring_Point: G-Ring_Latitude: 67.0021 G-Ring_Longitude: -69.9987 G-Ring_Point: G-Ring_Latitude: 67.0021 G-Ring_Longitude: -71.2585 G-Ring_Point: G-Ring_Latitude: 67.0021 G-Ring_Longitude: -74.9991 G-Ring_Point: G-Ring_Latitude: 68.0021 G-Ring_Longitude: -74.9991 Keywords: Theme: Theme_Keyword: geoscientificInformation Theme_Keyword: Geological and geophysical Theme_Keyword: Geology Theme_Keyword_Thesaurus: None Place: Place_Keyword: Weeks Bay Place_Keyword: Hantzsch River Place_Keyword: Tredgold Lake Place_Keyword: Foxe Basin Place_Keyword: Air Force Island Place_Keyword: Hantzsch Bay Place_Keyword: Taverner Bay Place_Keyword: Granite Lake Place_Keyword_Thesaurus: None Access_Constraints: None Use_Constraints: Her Majesty the Queen in Right of Canada 2006 For more information, please contact the Copyright Officer at the following address: ESS Copyright Officer Business Development Office Earth Sciences Sector 615 Booth St., Ottawa, Ontario K1A 0E9 Sa Majesté la Reine du chef du Canada 2006 Pour plus d'information, prière de communiquer avec le responsable du droit d'auteur à l'adresse suivante : Responsable du droit d'auteur du SST Bureau d'expansion des affaires Secteur des sciences de la Terre 615, rue Booth Ottawa (Ontario) K1A 0E9 Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: G.D. Jackson Contact_Organization: Natural Resources Canada Contact_Address: Address_Type: Physical Address: 615 Booth Street City: Ottawa State_or_Province: Ontario Postal_Code: K1A 0E9 Country: Canada Contact_Voice_Telephone: 613-995-4731 Contact_Facsimile_Telephone: 613-943-5318 Contact_Electronic_Mail_Address: gajackso@NRCan.gc.ca Data_Set_Credit: Additional geology by Benson, D.G., Crawford, W.J., Davison, W.L., Ermanovics, I.F. and Morgan, W.C. Digital cartography by Narraway, J.D. Data_Quality_Information: Lineage: Source_Information: Source_Scale_Denominator: 250000 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 18 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -75.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 186.073 Ordinate_Resolution: 186.073 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.9786982139058207616105371232 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Mike Sigouin Contact_Organization: Natural Resources Canada Contact_Address: Address_Type: Physical Address: 601 Booth Street City: Ottawa State_or_Province: Ontario Postal_Code: K1A 0E8 Country: Canada Contact_Voice_Telephone: 613-943-0738 Contact_Facsimile_Telephone: 613-952-7308 Contact_Electronic_Mail_Address: msigouin@NRCan.gc.ca Resource_Description: Live Data and Maps Standard_Order_Process: Fees: None Metadata_Reference_Information: Metadata_Date: 20060126 Metadata_Future_Review_Date: 20110126 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Paul Huppé Contact_Organization: Natural Resources Canada Contact_Address: Address_Type: Physical Address: 601 Booth Street City: Ottawa State_or_Province: Ontario Postal_Code: K1A 0E9 Postal_Code: K1A 0E8 Country: Canada Contact_Voice_Telephone: 613-943-0996 Contact_Facsimile_Telephone: 613-995-2339 Contact_Electronic_Mail_Address: huppe@NRCan.gc.ca Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998