Item talk:Q58135

From geokb

{

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     "name": "Geologic map of the Strawberry Butte 7.5\u2019 quadrangle, Meagher County, Montana",
     "identifier": [
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         "propertyID": "USGS Publications Warehouse IndexID",
         "value": "sim3379",
         "url": "https://pubs.usgs.gov/publication/sim3379"
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         "propertyID": "USGS Publications Warehouse Internal ID",
         "value": 70185349
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         "propertyID": "DOI",
         "value": "10.3133/sim3379",
         "url": "https://doi.org/10.3133/sim3379"
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     "inLanguage": "en",
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         "name": "Scientific Investigations Map"
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     "datePublished": "2017",
     "dateModified": "2017-06-23",
     "abstract": "The 7.5\u2032 Strawberry Butte quadrangle in Meagher County, Montana near the southwest margin of the Little Belt Mountains, encompasses two sharply different geologic terranes.\u00a0 The northern three-quarters of the quadrangle are underlain mainly by Paleoproterozoic granite gneiss, across which Middle Cambrian sedimentary rocks rest unconformably.\u00a0 An ancestral valley of probable late Eocene age, eroded northwest across the granite gneiss terrane, is filled with Oligocene basalt and overlying Miocene and Oligocene sandstone, siltstone, tuffaceous siltstone, and conglomerate.\u00a0 The southern quarter of the quadrangle is underlain principally by deformed Mesoproterozoic sedimentary rocks of the Newland Formation, which are intruded by Eocene biotite hornblende dacite dikes.\u00a0 In this southern terrane, Tertiary strata are exposed only in a limited area near the southeast margin of the quadrangle.\u00a0 The distinct terranes are juxtaposed along the Volcano Valley fault zone\u2014a zone of recurrent crustal movement beginning possibly in Mesoproterozoic time and certainly established from Neoproterozoic\u2013Early Cambrian to late Tertiary time.\u00a0 Movement along the fault zone has included normal faulting, the southern terrane faulted down relative to the northern terrane, some reverse faulting as the southern terrane later moved up against the northern terrane, and lateral movement during which the southern terrane likely moved west relative to the northern terrane.\u00a0 Near the eastern margin of the quadrangle, the Newland Formation is locally the host of stratabound sulfide mineralization adjacent to the fault zone; west along the fault zone across the remainder of the quadrangle are significant areas and bands of hematite and iron-silicate mineral concentrations related to apparent alteration of iron sulfides.\u00a0 The map defines the distribution of a variety of surficial deposits, including the distribution of hematite-rich colluvium and iron-silicate boulders.\u00a0 The southeast corner of the quadrangle is the site of active exploration and potential development for copper from the sulfide-bearing strata of the Newland Formation.",
     "description": "Report: iii, 16 p.; 3 Sheets: 37.53 x 33.04 inches or smaller; Data Release; Read Me",
     "publisher": {
       "@type": "Organization",
       "name": "U.S. Geological Survey"
     },
     "author": [
       {
         "@type": "Person",
         "name": "Reynolds, Mitchell W. mwreynol@usgs.gov",
         "givenName": "Mitchell W.",
         "familyName": "Reynolds",
         "email": "mwreynol@usgs.gov",
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             "@type": "Organization",
             "name": "Geosciences and Environmental Change Science Center",
             "url": "https://www.usgs.gov/centers/geosciences-and-environmental-change-science-center"
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         ]
       },
       {
         "@type": "Person",
         "name": "Brandt, Theodore R. tbrandt@usgs.gov",
         "givenName": "Theodore R.",
         "familyName": "Brandt",
         "email": "tbrandt@usgs.gov",
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           "value": "0000-0002-7862-9082",
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             "name": "Geosciences and Environmental Change Science Center",
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     ],
     "funder": [
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         "name": "Geosciences and Environmental Change Science Center",
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         "name": "United States",
         "url": "https://geonames.org/4074035"
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         "name": "Montana"
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