Geophysical and Rb-Sr study of the Prairie Creek, AK kimberlite

Bolivar, S.L.; Brookins, Douglas G.

doi:10.1029/sp015p0289

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The Sr-isotope composition previously reported for the kimberlites is very variable: Mitchell and Crockett (1971) measured 87 Sr/86 Sr ratios ranging from 0.7058 to 0.7160 for apparently fresh South Africa kimberlites; Bolivar and Brookins (1979) reported values as high as 0.713 for some North American pipes and Paul (1979) has obtained comparable results (initial ratios between 0.703 and 0.7102) for Indian kimberlites. This situation is probably partly due to alteration and interaction of the kimberlites with groundwater.…”

Section: Strontium Isotope Compositionsupporting

confidence: 56%

“…Indeed, samples carefully selected on the basis of freshness criteria (olivine morphology, texture and uniformity of the groundmass, etc.) have lower 8~ Sr/86 Sr ratios, in the range 0.7038--0.7048 (Barrett and Berg, 1975): leaching experiments sometimes give more radiogenic leachable Sr (Paul, 1979) but do not always explain the variable isotopic composition (Bolivar and Brookins, 1979).…”

Section: Strontium Isotope Compositionmentioning

confidence: 99%

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Strontium-isotopic geochemistry of the Mbuji Mayi and Kundelungu kimberlites (Zaire, Central Africa)

Demaiffe

Fieremans

1980

Chemical Geology

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Section: Strontium Isotope Compositionsupporting

confidence: 56%

Section: Strontium Isotope Compositionmentioning

confidence: 99%

Strontium-isotopic geochemistry of the Mbuji Mayi and Kundelungu kimberlites (Zaire, Central Africa)

Demaiffe

Fieremans

1980

Chemical Geology

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“…Airborne surveys can directly locate kimberlite pipes and define optimal targets for ground follow up surveys (Paulo et al, 2007). So both surface and airborne magnetic surveys have had good successes in detecting kimberlite (Bolivar and Brookins 1979, Macnae 1979, Nixon 1981, Jaques, Lewis, and Smith 1986, Coopersmith and Mitchell 1989, Atkinson 1989, and Sarma, Verma, and Satyanarayana 1999.…”

Section: Geophysical Surveys For Kimberlitesmentioning

confidence: 99%

Joint Inversion of the Magnetic Anomaly Due to a Kimberlite Pipe and its Analytic Signal

Chen¹,

Chouteau²,

Keating³

2009

11th SAGA Biennial Technical Meeting and Exhibition

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“…However, many investigators recognized chemical and mineralogic differences between the classic kimberlites of South Africa and these diamond-bearing rocks of Arkansas (Bolivar, 1979;Gogineni and others, 1978;Lewis, 1977;Meyer, 1976;Mitchell and Lewis, 1983). The recent discovery of diamondifer-ous ultrapotassic rocks of the Kimberley region of Western Australia (Atkinson and others, 1984) and the petrologie work on the Murfreesboro District lamproites by Scott-Smith and Skinner (1984a, b) suggest that these rocks are, or at least have strong affinities to, olivine lamproites.…”

Section: Introductionmentioning

confidence: 99%

Geology and petrography of the Twin Knobs #1 lamproite, Pike County, Arkansas

Waldman¹,

McCandless²,

Dummett³

1987

Geological Society of America Special Papers

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The Twin Knobs #1 diatreme (TK1), delineated in 1981, is located 3.8 km southeast of Murfreesboro, Pike County, Arkansas and is within the northeast-trending group of pipes, plugs, and dikes that comprise the Murfreesboro district. TK1 is an elongate, bilobate pipe, oriented north-south, and approximately 0.05 km 2 in surface area. The diatreme penetrated the Lower Cretaceous Trinity Formation, whereas the Upper Cretaceous Tokio Formation overlies portions of the pipe. These relationships suggest an emplacement age of early Late Cretaceous, which is contemporaneous with isotopic ages obtained at the Prairie Creek lamproite complex (97 to 106 Ma; Gogineni and others, 1978).Rock types at TK1 include magmatic lamproites, sandy tuffs and breccias, and epiclastics. The magmatic breccias are porphyritic, with euhedral olivine, plus pyroxene and phlogopite phenocrysts set in a cryptocrystalline or glassy groundmass that also contains priderite, perovskite, and chromite. The sandy tuffs and epiclastics contain up to 30 percent quartz grains, in addition to lamproite and sedimentary rock fragments, set in a matrix of calcite, sericite, or fine-grained to cryptocrystalline glass.The average diamond grade from bulk sampling of the phases is 0.17 carats per 100 metric tons. Diamond crystal habits include octahedra, tetrahexahedra, macles, and fragments. Megacrysts of picroilmenite, chrome spinel, clinopyroxene, orthopyroxene, garnet, and nodules of eclogite, peridotite, Iherzolite, websterite, as well as crustal xenoliths, were recovered during sampling.Whole-rock and trace element geochemistry strongly suggests that Twin Knobs #1 has more affinities to olivine lamproite than to kimberlite.

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Geophysical and Rb-Sr study of the Prairie Creek, AK kimberlite

Cited by 5 publications

References 6 publications

Strontium-isotopic geochemistry of the Mbuji Mayi and Kundelungu kimberlites (Zaire, Central Africa)

Strontium-isotopic geochemistry of the Mbuji Mayi and Kundelungu kimberlites (Zaire, Central Africa)

Joint Inversion of the Magnetic Anomaly Due to a Kimberlite Pipe and its Analytic Signal

Geology and petrography of the Twin Knobs #1 lamproite, Pike County, Arkansas

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