Item talk:Q268944

{

 "USGS Publications Warehouse": {
   "@context": "https://schema.org",
   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Thin, low\u2010velocity crust beneath the southern Yukon\u2010Tanana Terrane, east central Alaska: Results from Trans\u2010Alaska crustal transect refraction/wide\u2010angle reflection data",
   "identifier": [
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse IndexID",
       "value": "70210202",
       "url": "https://pubs.usgs.gov/publication/70210202"
     },
     {
       "@type": "PropertyValue",
       "propertyID": "USGS Publications Warehouse Internal ID",
       "value": 70210202
     },
     {
       "@type": "PropertyValue",
       "propertyID": "DOI",
       "value": "10.1029/91JB02881",
       "url": "https://doi.org/10.1029/91JB02881"
     }
   ],
   "journal": {
     "@type": "Periodical",
     "name": "Journal of Geophysical Research B: Solid Earth",
     "volumeNumber": "97",
     "issueNumber": "B2"
   },
   "inLanguage": "en",
   "isPartOf": [
     {
       "@type": "CreativeWorkSeries",
       "name": "Journal of Geophysical Research B: Solid Earth"
     }
   ],
   "datePublished": "1992",
   "dateModified": "2021-03-16",
   "abstract": "A seismic refraction/wide\u2010angle reflection survey for the Trans\u2010Alaska Crustal Transect program reveals a thin, reflective crust beneath the southern Yukon\u2010Tanana terrane (YTT) in east central Alaska. These data are the first detailed refraction survey of the southern YTT and compose a 130\u2010km\u2010long reversed profile along the Alaska and Richardson highways. Results from this study indicate that low\u2010velocity (\u2264 6.4 km/s) rocks extend to approximately 27 km in depth. Based on these low velocities and an average Poisson's ratio of 0.23 determined for depths of \u226427 km, an overall silicic composition is interpreted for this portion of the crust beneath the Yukon\u2010Tanana terrane. From approximately 8 to 27 km depth the crust exhibits an increase in reflectivity. This middle to lower crustal reflectivity is modeled as alternating high\u2010 and low\u2010velocity lamellae with an average velocity of 6.1 km/s at 10 km depth to an average velocity of 6.4 km/s at 27 km depth. Beneath these reflective, low\u2010velocity rocks a 3\u2010 to 5\u2010km\u2010thick, 7.0 km/s basal crustal layer produces a prominent reflection that extends to offsets of up to 280 km. The crust\u2010mantle boundary, modeled at an average depth of 30 km, produces a variable\u00a0PmP\u00a0reflection, which may indicate lateral heterogeneity of this boundary, and a weak and emergent\u00a0Pn\u00a0refraction with a velocity of 8.2 km/s. We interpret the crustal section as follows: the low\u2010velocity rocks of the southern YTT extend from the surface to depths of approximately 10 km; underthrust Mesozoic flysch of the Kahiltna terrane, rocks of the Gravina arc, and basement of the Wrangellia(?) terrane extend from 10 to 27 km depth; a 3\u2010 to 5\u2010km\u2010thick layer of mantle\u2010derived mafic rocks, relic oceanic crust, or Wrangellia(?) terrane lower crust extends from 27 to approximately 30 km depth; a tectonically young Moho beneath the southern YTT is found at an average depth of 30 km; and it is underlain by a mantle that may be relatively cool and/or olivine rich. In this interpretation, the Yukon\u2010Tanana terrane is a thin\u2010skinned terrane. Our results indicate that tectonic, and possibly magmatic, underplating has played a significant role in crustal growth for central Alaska.",
   "description": "22 p.",
   "publisher": {
     "@type": "Organization",
     "name": "American Geophysical Union"
   },
   "author": [
     {
       "@type": "Person",
       "name": "Beaudoin, Bruce C.",
       "givenName": "Bruce C.",
       "familyName": "Beaudoin"
     },
     {
       "@type": "Person",
       "name": "Fuis, Gary S. fuis@usgs.gov",
       "givenName": "Gary S.",
       "familyName": "Fuis",
       "email": "fuis@usgs.gov",
       "identifier": {
         "@type": "PropertyValue",
         "propertyID": "ORCID",
         "value": "0000-0002-3078-1544",
         "url": "https://orcid.org/0000-0002-3078-1544"
       },
       "affiliation": [
         {
           "@type": "Organization",
           "name": "Earthquake Science Center",
           "url": "https://www.usgs.gov/centers/earthquake-science-center"
         }
       ]
     },
     {
       "@type": "Person",
       "name": "Mooney, Walter D. mooney@usgs.gov",
       "givenName": "Walter D.",
       "familyName": "Mooney",
       "email": "mooney@usgs.gov",
       "identifier": {
         "@type": "PropertyValue",
         "propertyID": "ORCID",
         "value": "0000-0002-5310-3631",
         "url": "https://orcid.org/0000-0002-5310-3631"
       },
       "affiliation": [
         {
           "@type": "Organization",
           "name": "Earthquake Science Center",
           "url": "https://www.usgs.gov/centers/earthquake-science-center"
         }
       ]
     },
     {
       "@type": "Person",
       "name": "Nokleberg, Warren J. wnokleberg@usgs.gov",
       "givenName": "Warren J.",
       "familyName": "Nokleberg",
       "email": "wnokleberg@usgs.gov",
       "identifier": {
         "@type": "PropertyValue",
         "propertyID": "ORCID",
         "value": "0000-0002-1574-8869",
         "url": "https://orcid.org/0000-0002-1574-8869"
       },
       "affiliation": [
         {
           "@type": "Organization",
           "name": "Geology, Minerals, Energy, and Geophysics Science Center",
           "url": "https://www.usgs.gov/centers/gmeg"
         }
       ]
     },
     {
       "@type": "Person",
       "name": "Christensen, Nikolas I.",
       "givenName": "Nikolas I.",
       "familyName": "Christensen",
       "affiliation": [
         {
           "@type": "Organization",
           "name": "Department of Earth and Atmospheric Sciences, Purdue University"
         }
       ]
     }
   ],
   "funder": [
     {
       "@type": "Organization",
       "name": "Earthquake Science Center",
       "url": "https://www.usgs.gov/centers/earthquake-science-center"
     },
     {
       "@type": "Organization",
       "name": "Geology, Minerals, Energy, and Geophysics Science Center",
       "url": "https://www.usgs.gov/centers/gmeg"
     }
   ],
   "spatialCoverage": [
     {
       "@type": "Place",
       "additionalType": "country",
       "name": "United States",
       "url": "https://geonames.org/4074035"
     },
     {
       "@type": "Place",
       "additionalType": "state",
       "name": "Alaska"
     },
     {
       "@type": "Place",
       "geo": [
         {
           "@type": "GeoShape",
           "additionalProperty": {
             "@type": "PropertyValue",
             "name": "GeoJSON",
             "value": {
               "type": "FeatureCollection",
               "features": [
                 {
                   "type": "Feature",
                   "properties": {},
                   "geometry": {
                     "type": "Polygon",
                     "coordinates": [
                       [
                         [
                           -151.259765625,
                           62.062733258846514
                         ],
                         [
                           -141.064453125,
                           62.062733258846514
                         ],
                         [
                           -141.064453125,
                           67.97463396204759
                         ],
                         [
                           -151.259765625,
                           67.97463396204759
                         ],
                         [
                           -151.259765625,
                           62.062733258846514
                         ]
                       ]
                     ]
                   }
                 }
               ]
             }
           }
         },
         {
           "@type": "GeoCoordinates",
           "latitude": 65.01868361044706,
           "longitude": -146.162109375
         }
       ]
     }
   ]
 }

}