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SEDIMENTARY ROCK ALTERATION IN THE SLICK ROCK DISTRICT D31
<br /> TABLE ls.-Comparison of the average cl2emfeal composition, of that indicate mostly the presence of impurities such as
<br /> nicks of eke red-beds,carbon,and altered facies quartz, clay minerals, feldspars, titanium oxides,
<br /> IBas•d on data in tables T. S. 10. 19, end 14. M. =Jar. Number of samples in
<br /> perentbeses) tourmaline, barite, and zircon-components of the
<br /> A.nd.tcn.. Al1t.r.N.., .•d.t..... prealte ration rock. Elements such as iron,
<br /> .Nd .... magnesium, manganese, and strontium are believed
<br /> Red-bed. C.rben attend Red-bed• Altered to be mostly in the calcite structure. Some other
<br /> (.cln facie9
<br /> facle,
<br /> f.clu f.c l.•
<br /> (2 1) (4) (55) (7) (l4) elements, such as chromium, copper, vanadium,
<br /> At-----
<br /> A >10 X H N 4 yttrium, and ytterbium, although perhaps not
<br /> I------- 2 2 1., 1 A
<br /> r.-•----- .9 2 .A 2 0 residing principally in the calcite structure, are
<br /> NA------- .1 .15 .A .a I
<br /> C.------- I.a 4 1., 5 .5 believed to represent valid chemical differences
<br /> N.------- .4 1 .2 1 1 between red-beds-fades and altered-facies rocks that
<br /> R---•---- l.4 .e 1 1 2.4
<br /> *'------• .15 .11 .10 .0 3 were the result of alteration. On this basis it is seen
<br /> Nn------- .05 .09 .02 .05 .61
<br /> AA------- 0 ..00001 0 0 ..0000l that the averages of iron, chromium, copper,
<br /> A-----•-• <.0I 0 < 01 <.ol <.ol strontium, vanadium, yttrium, and ytterbium are
<br /> A-------- .001 0 .009 .007 .01
<br /> A.-----.. .ne .10 .04 04 .00
<br /> ee------ eater in calcite of the altered fades than in calcite of
<br /> ..0oot5 0 0 <.0oal .0oot greater
<br /> Ce------- <.000A ..00t ..00l .002 .002 the red-beds fades. Only manganese appears to be
<br /> Cr------- .001 .002 .001 .009 .11
<br /> C-------- .002 .002 .002 .005 .005 less abundant in calcite of the altered fades than in
<br /> Le------- 0.ao1 a 001 a.ool ,;002 <:01 calcite of the red-beds fades.
<br /> No------- 0 0 0 0 0
<br /> Nb------- <.0015 0 <.00I5 0 0 Despite the fact that numerous chemical and radio-
<br /> Nl-------
<br /> .000, .001 .0o1 .009 .005
<br /> Pb------- ..0011 .001 .002 <.001 .002 metric measurements have been made to indicate the
<br /> se------- ..000A .001 ..001 .002 .005
<br /> en------- 0 <.01 0 0 0 uranium content of mineralized rocks from the Slick
<br /> Ar------- soot .05 .006 .00 .09 Rock district, few have been made to indicate the
<br /> v--•----- .004 .001 .004 .000 .01
<br /> Y-------- .0011 .00, .001 .005 .005 uranium content of so-called unmineralized rocks.
<br /> Yb------- 1 ..00014 .0000001 .0001 .0000
<br /> 2r------- .018 .01 .02 .00 .02 Analytical data are sparse,therefore, on the uranium
<br /> content of red-beds-, carbon-, and altered-facies
<br /> rocks. Nevertheless it is possible to estimate the
<br /> From the table, it appears that commonly iron, uranium content of these rocks-using assumptions
<br /> calcium, and niobium, and less commonly magnesium regarding the potassium and thorium contents of the
<br /> and chromium, were leached from altered-facies sand- rocks-by means of gamma-ray logs that were made
<br /> stone during alteration. On the other hand, commonly of all diamond-drill holes drilled by the U.S. Geological
<br /> cobalt, and more rarely lead(?), vanadium, yttrium, Survey in the Slick Rock district. Such estimates
<br /> and ytterbium may have been added to altered-facies made from the gamma-ray lags of drill holes shown on
<br /> sandstone during alteration. Other elements such as plate 1 as well as some other drill holes indicate
<br /> sodium, potassium, titanium, manganese, boron(?), significant differences between the uranium content of
<br /> barium, copper, gallium, nickel(?), scandium(?), red-beds-and carbon-facies rocks and of altered-facies
<br /> strontium, and zirconium either were leached or rocks.
<br /> added only rarely, or were both leached and added in
<br /> different pairs of samples. Niobium was added to one
<br /> altered-facies sandstone sample although commonly
<br /> leached from other samples, and cobalt(?) was leached
<br /> from one altered-facies sandstone sample although
<br /> commonly added to other samples. chemical Composition
<br /> comparisons of the three
<br /> `Variations in the chemical compositions of calcite in facies in the Slick Rock
<br /> the three fades of rocks in the Slick Rock district are District with text
<br /> an additional suggestion of the effects of alteration on excerpts (from Shawe,
<br /> the composition of the sedimentary rocks. In 1976) .
<br /> comparing the compositions of calcite separated from
<br /> red-beds- and altered-facies rocks shown in table 3
<br /> (calcite from carbon-facies rocks is represented by
<br /> only one sample and is not considered in this
<br /> comparison), the contents of some elements are
<br /> ignored, such as silicon, aluminum, sodium,
<br /> potassium, titanium, boron, barium, and zirconium
<br />
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