1995-03-22_GENERAL DOCUMENTS - M1977451 (4)

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TABLE 8.-Average mineral composition, in percent, of sand. stones from the Salt Wash Member of the Morrison Formation - IBaed on model ppooint counts tt200 points) and model estimate of thin sections. TABLE 5.-Comparison of average mineral tompoeilion of ean� "Minor'gw=India"la.than 0.25 percent) stones from the Salt Wash ember, Slick Rock district, with that of eandetonee from the Salt Wash Member throughout the Component iwa, MidaIImi Colorado Plateau uninit i Slim Rock district Quartz grains and overgrowtha----_ 78 77.5 75' Colorado Chert_-- 7 2 0.5 Component Orthoclase----------------------- 10 3.5 4. 5 Point Modal Average Plateau r counts etaaae Microcliae----------------------- 1 .5 .5 Plagioclace----------------------- I 1 1 uartz_____.----- 72.3 71. 7 72.0 71.4 Rock fragments and mineral aggre- Q gates-------------------------- 2 Minor Minor Quarts oveegrowtha____._. 4.3 4.3 4.3 4 Clay (mineral clay and clay-sited Chert-------------------- 4.8 8.4 5.8 5.8 detritus)----------------------- Minor 1 2 K-feldspar--------------- 2. 7 5.3 4.0 l 5.8 Calcite and dolomite-------------- 2 13 9 Plagioclase--------------- .8 .9 Ba rite----------_---------------- Minor -------- Minor Calcite------------------ 8.2 S. 5 8. 3 13 Chlorite------------------------- Minor Minor Minor Clay____________________ 2. 1 29 2.5 -------- Hematite and other black opaque Other- 5.0 -------- 2.5 -------- minerals_______________________ Minor .5 Minor Biotite__________________________________ Minor Minor Number of samples------- 19 19 38 202 Muscovite_______________________________________ Minor Leucozene and anatsse------------ Minor Minor Minor Limonite----------------------------- ----- --_ Minor Analyzed b7 B. A. Cadillac,olgilatsd fines dataof Craig and oxen, (IOU Pyrite____________________ p.lna.z). -'----------'-- Minor -------- Number of samples--------------- 1 3 14 TABLr, 7.Average mineral composition in percent, of silGtones from the Salt Wash Member of the korruon Formation TABLE Salt innash al composit _of the,in per , F rmaiion�from the [Based on modal point wants (2m points) and modal estimates of thin sections. "Minor'generally indicates lea than om pa all (Bawd an modal etimates of thin section."Minor^ generally Indicates Im than 0.25 perwati Component Lower Middle u unit unit cat Component Iowa Middle unit unit Quartz grains and overgrowths_____ 50 45 52.5 Chert---_________________ _ 5 5 3.5 Quartz grains and overgrowths------------- 28 30 Orthoclase----- 5 5 3 Chert----------------------------------- 3 4 Microcline 1 2 .5 Orthoclase --------------- 2 3 Plagioclase 3 2 .5 Microcline--------------------------------------- I Clay (mineral clay and clay-sized Plagioclase------------------------------- I I detritus)----------------------- 25 30 12 Clay------------------------------------ 85 15 Calcite-------------------------- 10 10 27 Calcite and dolomite---------------------- 2 45 Chlorite_________________________ Minor Minor Minor Hematite and other black opaque minerals----------- 1 Hematite 'and other black opaque Blotite------------------------------- Minor --- minerals----------------------- Minor Minor ------- Muscovite------------------------------- Minor Minor Biotite----'-------------------------- ------- Minor Leucozene Minor Minor Muscovite_______________________ Minor -------- Minor Pyrite-.--------------------------------- Minor --______ Leucozene Minor Minor Minor Carbonaceous material-------------------- 1 -----'-- Limonite________________________________________ Minor Number of samples----------------------- 1 1 Number of eamples________________ 1 1 2 Mineral Composition of Salt wash rocks in the Slick Rock District (from Shawe, 1968) .