Item talk:Q311441

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   "name": "Exploring the geology of the Midcontinent Rift under western Lake Superior using a preliminary velocity model of seismic line GLIMPCE C",
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   "datePublished": "2023",
   "dateModified": "2023-09-28",
   "abstract": "Seismic-reflection data were collected in the 1980s as part of the Great Lakes International Multidisciplinary Program on Crustal Evolution (GLIMPCE) to investigate the 1.1 Ga Midcontinent Rift System (MRS). GLIMPCE Line C crosses western Lake Superior from north to south shores (Fig. 1 inset). Many previous workers have interpreted the MRS in Line C as an asymmetric central graben filled with 10\u201320 km of subaerial basalt flows, overlain by 7-10 km of sedimentary section, and underlain by magmatic underplating. The central graben was interpreted to have formed from extensional normal faults, later reactivated as high-angle reverse faults. The northern part of Line C crosses over a prominent gravity low called the Grand Marais Ridge (GMR; Fig. 1 inset), previously interpreted as an Archean granitic basement high. ",
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     "name": "Institute on Lake Superior Geology"
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       "name": "Grauch, V. J. S. tien@usgs.gov",
       "givenName": "V. J. S.",
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       "name": "Heller, Samuel J. sheller@usgs.gov",
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       "name": "Woodruff, Laurel G. woodruff@usgs.gov",
       "givenName": "Laurel G.",
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