A. V. Heyl
1968
<p><span>Metallic sulfides, </span>fluorite<span>, </span>barite<span>, and celestite are widespread </span>in<span> the sedimentary rocks of the </span>central<span> </span>United<span> </span>States<span>. Many </span>occurrences<span> are </span>epigenetic<span> concentrations either </span>in<span> known major mineral districts or </span>in<span> clusters of deposits that warrant further exploration for potential ore. Evaluation of trace-element composition, of fluid inclusions, of depositional temperature, and of isotopic composition of sulfur may help discriminate potentially economic deposits from even more widespread, probably noneconomic, syngeneic </span>occurrences<span>. Known major mineral districts and many promising </span>sulfide<span> </span>occurrences<span> are located along complex major fault systems and particularly over structural domes at intersections of fault systems. Economically promising </span>sulfide<span> deposits occur along a west-trending fault system crossing Kentucky and Missouri near the 38th parallel, particularly at associated cryptoexplosion structures along it, at the intersection of the fault system with the Cincinnati arch. Elsewhere </span>in<span> the </span>central<span> </span>United<span> </span>States<span>, promising </span>sulfide<span> </span>occurrences<span> are located along the crest of the Findlay arch, near Serpent Mound, Ohio, along the northwest-trending Mount Carmel fault </span>in<span> southwestern Indiana, and buried at depth </span>in<span> oil fields of west-</span>central<span> Kansas.Other types of deposits that are productive or may have some future economic interest are locally economic and possibly </span>syngenetic<span> red-bed copper </span>occurrences<span> </span>in<span> Oklahoma, Texas, Kansas, and Pennsylvania. Most widespread are the black shale and pyritic sandstone beds, some of which have been a source of pyrite for sulfur and sulfuric acid </span>in<span> conjunction with coal mining. Bedded </span>barite<span> deposits of possibly </span>diagenetic<span> origin have been mined </span>in<span> Arkansas. </span>Diagenetic<span> siderite concretions containing sulfides and </span>barite<span> were widespread sources of iron </span>in<span> the 19th century. </span></p>
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10.2113/gsecongeo.63.6.585
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Society of Economic Geologists
Minor epigenetic, diagenetic, and syngenetic sulfide, fluorite, and barite occurrences in the central United States
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