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Browsing by Subject "2015 Precambrian Field Camp"

Now showing 1 - 7 of 7
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    2015 Precambrian Field Camp
    (2015-08) University of Minnesota Duluth. Precambrian Research Center
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    2015 Precambrian Field Camp Capstone Mapping Projects Map
    (2015) University of Minnesota Duluth. Precambrian Research Center
    This map shows the locations of the capstone mapping projects for the 2015 Precambrian Field Camp sponsored by the Precambrian Research Center. It also indicates who participated in which project.
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    Bedrock Geologic Map of the Devilfish Lake Area, Cook County, Minnesota
    (2015-08) McClendor, Taylor; Spinelli, Kristen; Walsh, Aiden; Asp, Kris; Larson, Phillip
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    Bedrock Geology Map of the Crocodile Lake Intrusion: Cook County, Northeastern Minnesota
    (2015-08) Church, Andrew; Curry, Zach; Dim, Jules; Lawyer, Luke; Reale, Peter; Slachter, Mitchell; Fix, Paul J; Peterson, Dean M
    This map includes new bedrock geologic mapping by the authors combined with compilation of previous work (see references) under the direction of Dr. Dean Peterson for the 2015 Precambrian Research Center’s field course. The intent of this work was to improve upon previous mapping and to investigate potential economic mineralization near the base of the Crocodile Lake intrusion in Cook county Minnesota. Bedrock outcrop mapping at a scale of 1:20,000 was conducted in the Boundary Waters Canoe Area Wilderness (BWCAW) focusing on the areas immediately surrounding Crocodile Lake. During a period of five days, 233 outcrops were mapped along >130 miles of both land and canoe raverses. In addition, over 45 rock samples were collected from the field to aid the USGS in a regional assessment of mineralization potential. Early reconnaissance mapping was done by Dr. Dean Peterson and Dr. Phil Larson along Shoe Lake Road to the southeast of the map area. Using work done by F.F. Grout from 1925-1927 as a starting point, our intent was to discriminate units initially mapped by Grout as undifferentiated gabbro. After collecting data we were able to discern six units of gabbro, one of which has trace sulfides. Comparisons were made to the Poplar Lake intrusion, a similar Early Gabbro series of the Duluth Complex to the west of the map area. While the Poplar Lake and Crocodile Lake intrusions may be a correlative, a comparison of the lithologies suggests a distinction between the two. However, further mapping of the contact is needed for a definite conclusion. The authors acknowledge and appreciated the support of the University of Minnesota-Duluth, and to the staff of the Precambrian Research Center.
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    Bedrock Geology Map of the Knife Lake Group and Related Intrusions near Kekekabic Lake: Lake County, Minnesota
    (2015-08) Christenson, Jaron; Kent, Morgan; Puzel, Ryan; Spreitzer, Steven; Upton, Margaret; Jirsa, Mark J
    This map was created by undergraduate students attending the Precambrian Research Center Field Camp in the summer of 2015 under the guidance of Mark Jirsa, Minnesota Geological Survey. Reconnaissance mapping at a scale of 1:24,000 was conducted by the authors in the Boundary Waters Canoe Area Wilderness (BWCAW) in the vicinity of Kekekabic Lake. The goal of this endeavor was to uncover the regional geologic history of Neoarchean rocks of the Knife Lake Group that have been influenced by volcanism and intruded by igneous bodies. An additional goal was to acquire an understanding of the contact between the Mesoproterozoic Duluth Complex and other Proterozoic intrusions, and the Knife Lake Group. Nearly 220 outcrops were examined in the course of 8 days by traveling approximately 130 miles by canoe and land traverses to con rm the internal lithologic variability, contact relationships, stratigraphic facing, and structure. The area primarily contains etasedimentary, metavolcanic, and intrusive rocks of the Neoarchean Knife Lake Group. Metasedimentary rocks including graywacke, slate, sandstone and conglomerate that were deposited in alluvial fan, fluvial, and subaqueous environments. Metavolcanic rocks include largely porphyritic, mafic and intermediate flows that shed detritus to the sedimentary units. The metasedimentary and metavolcanic units are intruded by polyphase intrusions, which also contributed detritus to some sedimentary rocks. The Neoarchean rocks were intruded by Proterozoic diabase dikes and the Duluth Complex.
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    Bedrock Geology of the Cherokee Lake Area, Boundary Waters Canoe Area Wilderness, Cook County, Minnesota
    (2015-08) Balles, Aaron; Brown, Ellie; Helms, Ryan; Miller, James; Penzel, Greta; Smith, Lukas R
    This map was compiled based on the mapping of over 300 outcrops over the course of 4 days under the supervision of Dr. Jim Miller. Five students, along with Dr. Miller, mapped outcrop along the shorelines of Cherokee Lake and Town Lake in order to better understand the lithostratigraphy, contact relationships, and other features of the Duluth Complex and Brule Lake - Hovland Complex. (Brooker and Miller, 2013).
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    Bouguer Anomaly Map of the Devilfish Lake Area, Cook County, Minnesota
    (2015-08) McClendor, Taylor; Spinelli, Kristen; Walsh, Aiden; Asp, Kris; Larson, Phillip
    This map displays the contour Bouguer anomaly values measured in milligals based on a gravity survey conducted by Taylor McClendon under the guidance of Phillip Larson, Vesterheim Geoscience PLC. The purpose of this map is to identify the contact relationships between the Crocodile Lake Gabbro, Cucumber Lake Granophyre and a hybrid constituent, as well as describing the contacts between the Esther Lake Lavas, Grand Portage Basalt and Hovland Formation. A total of 85 gravity measurements located via GPS were taken along roads using a Lacoste and Romberg model gravimeter at 0.25 to 0.50 mile intervals Elevation values were retreived through LiDAR.