{"id":{"repo_id":"nodak","oai_identifier":"oai:commons.und.edu:theses-1137"},"canonical_url":"https://search.dev.ndltd.org/etd/nodak/oai:commons.und.edu:theses-1137","repository":{"repo_id":"nodak","name":"University of North Dakota","base_url":"https://commons.und.edu/do/oai/"},"display":{"title":"Heavy minerals of glacial sediments in the area of Red Lake Falls, Minnesota","abstract":"Pleistocene lithostratigraphic units containing glacial sediments in the Red Lake Falls, Minnesota, area and adjacent areas were studied to determine their heavy-mineral assemolages. Seventy-two samples of fine sand were studied by optical grain-count methods and 77 samples of fine sand were studied by x-ray diffraction methods. Most formations contain a hornblende-garnet-pyroxene-epidote assemblage; the Gervais Formation contains a pyroxene-hornblende assemblage. The mean proportion of the constituent minerals is different in each formation; however, there is overlap in the ranges of heavy mineral proportions among the formations. The Red Lake Falls Formation can be subdivided on the basis of garnet abundance.","abstract_html":"Pleistocene lithostratigraphic units containing glacial sediments in the Red Lake Falls, Minnesota, area and adjacent areas were studied to determine their heavy-mineral assemolages. Seventy-two samples of fine sand were studied by optical grain-count methods and 77 samples of fine sand were studied by x-ray diffraction methods. Most formations contain a hornblende-garnet-pyroxene-epidote assemblage; the Gervais Formation contains a pyroxene-hornblende assemblage. The mean proportion of the constituent minerals is different in each formation; however, there is overlap in the ranges of heavy mineral proportions among the formations. The Red Lake Falls Formation can be subdivided on the basis of garnet abundance.","abstract_has_math":false,"creators":["Hobbs, Howard"],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Geology","degree_department":null,"school":null,"contributors":["L. Clayton"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1973,"date_issued":"1973-01-01T08:00:00Z","date_published":"1973-01-01T08:00:00Z","updated_at":"2026-07-24T03:24:51Z","subjects":["Geology","Stratigraphic--Pleistocene; Heavy minerals--Minnesota--Red Lake Falls"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://commons.und.edu/theses/138","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["L. Clayton"]},{"key":"dc:creator","label":"Author","values":["Hobbs, Howard"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Geology","Stratigraphic--Pleistocene; Heavy minerals--Minnesota--Red Lake Falls"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://commons.und.edu/theses/138"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Pleistocene lithostratigraphic units containing glacial sediments in the Red Lake Falls, Minnesota, area and adjacent areas were studied to determine their heavy-mineral assemolages. Seventy-two samples of fine sand were studied by optical grain-count methods and 77 samples of fine sand were studied by x-ray diffraction methods. Most formations contain a hornblende-garnet-pyroxene-epidote assemblage; the Gervais Formation contains a pyroxene-hornblende assemblage. The mean proportion of the constituent minerals is different in each formation; however, there is overlap in the ranges of heavy mineral proportions among the formations. The Red Lake Falls Formation can be subdivided on the basis of garnet abundance."]},{"key":"dc:title","label":"Title","values":["Heavy minerals of glacial sediments in the area of Red Lake Falls, Minnesota"]}]}],"canonical_facts":{"dc:contributor":["L. Clayton"],"dc:creator":["Hobbs, Howard"],"dc:description.abstract":["Pleistocene lithostratigraphic units containing glacial sediments in the Red Lake Falls, Minnesota, area and adjacent areas were studied to determine their heavy-mineral assemolages. Seventy-two samples of fine sand were studied by optical grain-count methods and 77 samples of fine sand were studied by x-ray diffraction methods. Most formations contain a hornblende-garnet-pyroxene-epidote assemblage; the Gervais Formation contains a pyroxene-hornblende assemblage. The mean proportion of the constituent minerals is different in each formation; however, there is overlap in the ranges of heavy mineral proportions among the formations. The Red Lake Falls Formation can be subdivided on the basis of garnet abundance."],"dc:identifier":["https://commons.und.edu/theses/138"],"dc:subject":["Geology","Stratigraphic--Pleistocene; Heavy minerals--Minnesota--Red Lake Falls"],"dc:title":["Heavy minerals of glacial sediments in the area of Red Lake Falls, Minnesota"],"thesis:degree_discipline":["Geology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T03:24:51Z"}