A Spectrochemical Investigation of the Bala and Stockdale Intrusions, Riley County, Kansas

Eastwood, Raymond L.; Brookins, Douglas G.

doi:10.2307/3626346

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1967

1976

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Cited by 6 publications

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“…Pyrope from the Stockdale kimberlite, Riley County, Kansas (39'15'40" N.; 96'42'08" W.) has been identified and described by several investigators (BAGROWSKI, 1941;EASTWOOD and BROOKINS, 1965;ROSA and BROOKINS, 1966;BROOKINS, 1967a). A purplish-red variety occurs most frequently, but a green variety (composition un known, but more Cr-rich than the purplish-red variety) has also been noted.…”

Section: Introductionmentioning

confidence: 99%

Possible age of crystallization of pyrope from the Stockdale kimberlite, Kansas, U. S. A.

Brookins

1969

Geochem. J.

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Abstract-A possible age of 745 ± 100m.y. (using 50b.y. = half life of 87Rb) has been determined for pyrope from the Stockdale kimberlite assuming an upper mantle initial 87Sr/86Sr ratio of 0 .702 ± 0.001. Despite the large error associated with this age it clearly demonstrates that the pyrope crystallized long before its final emplacement which is set at < 100 m.y. Allowance for crustal and mantle contamination and other sources of error have been carefully considered in this determination.

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Section: Introductionmentioning

confidence: 99%