Lower Cave Creek Manganese Limestone, Independence County, Arkansas, USAi

Regional Level Types
Lower Cave Creek Manganese Limestone	- not defined -
Independence County	County
Arkansas	State
USA	Country

Deposit: This data file contains information pertaining to the maganiferous carbonate deposits for the following deposits: name file sequence number lower cave creek manganese limestone prospect 0050630256 upper cave creek manganese limestone prospect 0050630257 rutherford hollow Mn limestone prospect 0050630258 mulligan hollow manganese limestone prospect 0050630259 clubhouse manganiferous carbonate prospect 0050630260 blowing cave creek Mn limestone prospect 0050630261 lafferty creek manganese limestone prospect 0050630262

Geology: Geology the batesville district is on the southern edge of the ozark plateau, and is underlain by sedimentary sandstones, shales, limestones, and cherts of ordovician, silurian, devonian, and carboniferous age that have undergone little deformation. The rocks in the district dip slightly to the south, due to the general doming of the rooms in the ozark plateau. The general trend is obscured locally by minor folds and normal fault displacements; the synclinal features, basin areas. The folds are aligned northeast, and the series of normal faults trends east-west. Manganese deposits are concentrated in structural lows, while structural highs are nearly barren. Lithology the boone chert formation caps most of the hills in the district. The major deposits occur in the fernvale limestone and in the cason shale which rest uncomfortably above it. The boone formation often rests directly on the cason shale, or on the fernvale limestone where the shale is absent. The fernvale limestone is a coarse-grained massive, cross-bedded, dark gray or pinkish gray limestone which is friable in exposed ledges. The limestone reaches a maximum thickness of 125 ft(38m) at the western boundary of the manganese district and thins out eastward. The average thickness of the fernvale is 100 ft (30m). Manganese and iron oxides and carbonates occur fairly uniform in the upper 10-50 ft (3-15m) of the limestone, and are concentrated in its residual days. The cason shale is a lenticular, phosphate, greenish- gray shale which averages about 5 ft(1.5m) thick. The com- position of the shale varies greatly, but in some localities it contains very high grade manganese.this shale contains a layer, generally a few feet thick, of yellowish sandstone which outcrops As ledges. These ledges are used As markers by prospectors, As manganese ores are commonly found below them. Minerals primary manganese mineralization is believed to have been deposited As carbonates and oxides of manganese in the batesville district by circulating hypogene solutions in top heads of the fernvale and cason shale. The primary minerals include hausmanite, braunite, rhodochrosite and other carbonites found disseminated in unaltered or slighty altered replacement deposits. The manganese mineralization is most heavily concentrated in the cason shale and in the upper 10-50 ft(3-15m) of the fernvale limestone.

References

Other Databases

Link to USGS MRDS:	10114413

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