Name: morrison_007_topseal_thick_22

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Description: <DIV STYLE="text-align:Left;"><P STYLE="text-align:Justify;font-size:16ptmargin:7 0 7 0;"><SPAN><SPAN>The Brushy Basin Member of the Morrison Formation consists mostly of a mudstone and claystone lithology composed to varying degrees of smectitic clays (Turner and Fishman, 1991). We propose this unit as the regional seal for the sand-dominated units that compose the brine formation selected for consideration of CO</SPAN></SPAN><SPAN><SPAN>2</SPAN></SPAN><SPAN><SPAN> sequestration. We found an isopach map for the Brushy Basin Member only in a small area of the Grants uranium district, but Turner and Fishman (1991) did provide a map of the different clay mineralogies of the unit. By extrapolation, we present this map as a first-order approximation of the continuity of the Brushy Basin Member. Turner and others (1991) also presented a cross section (their fig. 1, A–A') that contains measured sections at Beclabito (west of Shiprock, NM) and Piedra River (east of Durango, CO). The sections contain more than 50 and 90 m (gross), respectively, of the Brushy Basin Member. The Piedra River section contains at least 40 m of authigenic albite tuffs. Presumably these tuffaceous and altered tuffaceous deposits thin southwestward toward the Beclabito section, where tuffaceous material composes much less (&lt;20 percent) of the section (fig. 4, Turner and others, 1991). We assume that the claystone and tuffaceous lithologies constitute the aquitard that confines the underlying aquifer.</SPAN></SPAN></P><DIV><P><SPAN /></P></DIV></DIV>

Service Item Id: 184048858f0d45c69108d108ae80e803

Copyright Text: Turner, C. E., and Fishman, N. S., 1991, Jurassic Lake T'oo'dichi': a large alkaline, saline lake, Morrison Formation, eastern Colorado Plateau: Geological Society of America Bulletin, v. 103, no. 4, p. 538–558.

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