Browsing by Author "Boerboom, Terrence J"
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Item Bedrock Geologic Map of the Brule River area, Pine Mountain Quadrangle, Cook County, Minnesota, USA(2013-08) Fix, Paul J; Ginley, Stephen J; Schraeder, Lauren A; Summers, Aaron J; Boerboom, Terrence J; Doyle, Mike MItem Bedrock Geology Map of Kadunce River and Surrounding Area: Cook County, Northeastern Minnesota(2010-08) Carlson, Eric J; Holton, Corey J; Kubitza, Kyle W; Mulvey, Lucy; Scheurer, Eric; Boerboom, Terrence JThis map was created between August 2nd-12th, 2010 by students of the University of Minnesota-Duluth. The project was completed under the supervision of the Precambrian Research Center as well as the Minnesota Geologic Survey. Mapping was carried out between the 2nd and 7th of August, 2010 in the Kadunce quadrangle of Cook County. Compilation of the map took place between the 9th-12th of August, 2010 at the Geology Department of the University of Minnesota-Duluth.Item Bedrock Geology Map of the Granophyre Transition Zone into the North Shore Volcanic Group, Cook County, Minnesota(2014-08) Kramer, Meredith; Sauer, Sarah; Gordee, Sarah M; Boerboom, Terrence JThis map represents a compilation of data taken in the southern half of the Lima and Pine Mountain Quadrangles between August 4 and 9, 2014 by a PRC field camp student under the direction of Terrence Boerboom. It is part of a broad scale goal by the Minnesota Geological Survey to map in detail the geology of Minnesota’s north shore. While the shoreline quads are mostly completed, this is one of the first inland sections to be mapped at a detailed scale. The 347 outcrops were accessed by either using an all terrain vehicle on the trails or traversing areas in the bush by foot. Statewide 1 meter LiDAR elevation maps were used as a tool to search for outcrop while in the bush.Item Bedrock Geology of the Tait Lake Quadrangle, Cook County, Minnesota(2009-08) Boerboom, Terrence J; Creighton, Daliyce; McGinn, Kevin; Magnuson, AaronItem C-37, Geologic Atlas of Brown County, Minnesota(Minnesota Geological Survey, 2016) Boerboom, Terrence JA County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.Item C-51, Geologic Atlas of St. Louis County, Minnesota(Minnesota Geological Survey, 2022) Bauer, Emily J; Jirsa, Mark A; Block, Amy R; Boerboom, Terrence J; Chandler, V.W.; Peterson, Dean M; Wagner, Kaleb G; McDonald, Jennifer M; Dengler, Elizabeth L; Meyer, Gary N; Hamilton, Jacqueline DA County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.Item C-52, Geologic Atlas of Aitkin County, Minnesota(Minnesota Geological Survey, 2022) Bauer, Emily J; Chandler, V.W.; Boerboom, Terrence J; Knaeble, Alan R; Nguyen, Maurice K; Lively, R. S.; Setterholm, Dale R; Steenberg, Julia RA County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.Item C-54, Geologic Atlas of Lake County, Minnesota(Minnesota Geological Survey, 2022) Bauer, Emily J; Jirsa, Mark A; Block, Amy R; Boerboom, Terrence J; Chandler, V.W.; Peterson, Dean M; Wagner, Kaleb G; McDonald, Jennifer M; Dengler, Elizabeth L; Meyer, Gary N; Hamilton, Jacqueline DA County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.Item C-65, Geologic Atlas of Lac qui Parle County, Minnesota(2023) Bauer, Emily J; Hirsch, Aaron C; Steenberg, Julia R; Severson, Allison R; Boerboom, Terrence J; Radke, Angela J; Lively, R. S.A County Geologic Atlas project is a study of a county's geology, and its mineral and ground-water resources. The information collected during the project is used to develop maps, data-base files, and reports. This same information is also produced as digital files for use with computers. The map information is formatted as geographic information system (GIS) files with associated data bases. The maps and reports are also reproduced as portable document files (PDFs) that can be opened on virtually any computer using the free Acrobat Reader from Adobe.com.Item Characterization of the Philbrook Intrusion, Central Minnesota(Minnesota Geological Survey, 2017) Boerboom, Terrence J; Geary, JesseThe Philbrook intrusion is an informal name for a small, sub-circular mafic pluton that is exposed at the surface along the southeast side of the Long Prairie River near the town of Philbrook, in northeastern Todd County, central Minnesota. An 40Ar/39Ar age of 1,854 ± 4 Ma has been obtained from a sample of what is interpreted to be magmatic hornblende from the intrusion. The pluton is composed primarily of melanocratic to mesocratic diorite, along with substantial proportions of pyroxenite, hornblendite, oxide-apatite rock (nelsonite), and rare anorthosite as inclusions in the mesocratic diorite. The Philbrook intrusion contains abundant hornblende interpreted to be both primary-magmatic and secondary-deuteric, which coupled with local net-veined pegmatitic textures and pervasively saussuritized plagioclase, imply that the magma was rich in hydrous components. Even though primary textures are commonly overprinted by secondary hornblende, relict primary cumulate textures are present in most of the different rock types. Chemically, the entire suite of rocks is high in phosphorous, iron, titanium, and vanadium, and low in silica, magnesium, and potassium. The Philbrook intrusion was emplaced into a suite of interlayered sedimentary, volcanic, and hypabyssal intrusive rocks that have been inferred to be Paleoproterozoic, but have more recently been interpreted to be possibly Archean, in age. The country rocks are schistose and were regionally metamorphosed to the upper greenschist/lower amphibolite facies, either during or before the Penokean Orogeny, or possibly both, depending on their age, which is unknown.Item GEOPHYSICAL AND PETROLOGIC ADVANCES IN UNDERSTANDING THE TAUNTON-BELT WEDGE, AN ARCHEAN TERRANE WITHIN THE MINNESOTA RIVER VALLEY SUBPROVINCE OF THE SUPERIOR CRATON, NORTH-CENTRAL U.S.A.(2023) Southwick, David L; Chandler, V.W.; Jirsa, Mark A; Boerboom, Terrence JThe Taunton-belt wedge, defined herein, is an unexposed fault-bounded Archean terrane located within the Morton block of the Minnesota River Valley (MRV) subprovince of the Superior Craton. It is bounded on the north by the Yellow Medicine shear zone (YMSZ), a prominent regional structure that extends from the west margin of the Paleoproterozoic Penokean orogen in Minnesota to the east margin of the Paleoproterozoic Trans-Hudson orogen in South Dakota. The south boundary of the wedge is a less distinct curving fault zone that splays west–southwest from the YMSZ in south-central Minnesota and rejoins it in eastern South Dakota. The interior geology of the wedge is poorly known, owing to continuous cover of the Precambrian basement by Phanerozoic strata and Pleistocene glacial deposits. Regional aeromagnetic and ground gravity mapping indicate a broad belt of mafic metavolcanic and related rocks in roughly the northern half of the wedge, and many granitoid intrusions in the southern half. Geophysical signatures characteristic of layered gneiss, such as those observed over known gneiss elsewhere in the Morton block, are minor to absent.Item M-199, Bedrock Geology of the Mark Lake Quadrangle, Cook County, Minnesota(Minnesota Geological Survey, 2018) Boerboom, Terrence J; Green, John CPortrays the bedrock geology of the Mark Lake quadrangle which prior to this effort was largely unmapped. The map shows the distribution of the various rock types, locations of bedrock outcrops, and structural attributes of the bedrock. Mapped outcrops were used to constrain the geology for the most part, but mapping was augmented by the use of geophysical maps, and lidar imagery. Lidar was especially useful in locating bedrock outcrops during field work, and also for delineating the various bedrock units during the map compilation stage following fieldwork.