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      The persistence of brines in sedimentary basins

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      Article (1.009Mb)
      Date
      2018-05-08
      Author
      Ferguson, Grant
      McIntosh, Jennifer C.
      Grasby, Stephen E.
      Hendry, M. Jim
      Jasechko, Scott
      Lindsay, Matthew B. J.
      Luijendijk, Elco
      Publisher
      American Geophysical Union
      Type
      Article
      Peer Reviewed Status
      Peer Reviewed
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      Abstract
      Brines are commonly found at depth in sedimentary basins. Many of these brines are known to be connate waters that have persisted since the early Paleozoic Era. Yet questions remain about their distribution and mechanisms for retention at depth in the Earth’s crust. Here we demonstrate that there is insufficient topography to drive these dense fluids from the bottom of deep sedimentary basins. Our assessment based on driving force ratio indicates that sedimentary basins with driving force ratio > 1 contain connate waters and frequently host large evaporite deposits. These stagnant conditions appear to be relatively stable over geological time and insensitive to factors such as glaciations, erosion, compaction, and hydrocarbon generation.
      URI
      http://hdl.handle.net/10388/12378
      Subject
      brines
      connate water
      sedimentary basins
      groundwater
      variable density flow
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      • Geological Sciences
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