|
|
Magnet Cove, Hot Spring Co., Arkansas, USA
Latitude: 34°27'14"N
Longitude: 92°50'38"W
Longitude: 92°50'38"W
The carbonatite occurs in irregularly shaped bodies in the central part of the complex. Aggregates of apatite, magnetite, pyrite, monticellite, perovskite, and kimzeyite (zirconium garnet) are scattered through a groundmass of coarse calcite. Part of the carbonatite has weathered to porous rock composed of residual apatite, magnetite, and perovskite in a matrix of secondary apatite. In contact with the ijolite, the carbonatite fluids were reactive and altered the minerals of the ijolite.
Dikes outside the complex are grouped in the following categories: pegmatite, aplite, syenite, trachyte porphyry, trachyte, tinguaite, andesite, diorite, monzonite, and lamprophyre.
Veins of various types are found both within and outside the complex: quartz-brookite-rutile veins, most common in the recrystallized novaculite on the east edge of the complex; feldspar-carbonate veins, most common in the northern two-thirds of the complex; and feldspar, quartz-feldspar, and fluorite veins. Late quartz veins are associated with the carbonatite. Molybdenite and apatite veins are found in the carbonatite and ijolite. Earthy monazite, apparently a weathering product of an apatitepyrite vein, was found in the central part of the complex. Paramorphs of rutile after brookite are found as float throughout the complex but are most abundant in the northern two-thirds of the complex. USGS PP 425
Geologic Map USGS PP425
Mindat Articles
Analysis of Arkansas Syenite Minerals - Part 2 by Henry BarwoodMineral List
Mineral list contains entries from the region specified including sub-localities261 entries listed. 143 valid minerals. 5 type localities (valid minerals).
Localities in this Region
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
References
Macrery, J., 1806, A description of the Hot Springs and volcanic appearance in the country adjoining the river Ouachita in Louisiana: New York Medical Depository, v. 3, p. 47-50 (communicated in a letter to Dr. Miller, according to Williams (1891)).
Williams, J. F., (1891) The igneous rocks of Arkansas: Arkansas Geol. Survey Ann. Rept., 1890, v. 2, 457 p.
Landes, K.K. (1931) A paragenetic classification of the Magnet Cove minerals. American Mineralogist (16), 313-326.
Erickson, Ralph Leroy; Blade, Lawrence Vernon (1963) Geochemistry and petrology of the alkalic igneous complex at Magnet Cove, Arkansas. USGS Prof. Paper 425
Williams, J. F., (1891) The igneous rocks of Arkansas: Arkansas Geol. Survey Ann. Rept., 1890, v. 2, 457 p.
Landes, K.K. (1931) A paragenetic classification of the Magnet Cove minerals. American Mineralogist (16), 313-326.
Erickson, Ralph Leroy; Blade, Lawrence Vernon (1963) Geochemistry and petrology of the alkalic igneous complex at Magnet Cove, Arkansas. USGS Prof. Paper 425
This page kindly sponsored by Peter Hargis