--> Abstract: The Age of the Pennsylvanian-Permian Boundary from U-Pb Dating of Paleosol Calcite and Implications for Cycle Duration, by T. E. Rasbury, G. N. Hanson, W. E. Holt, R. H. Goldstein, and Arthur H. Saller; #90937 (1998).

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Abstract: The Age of the Pennsylvanian-Permian Boundary from U-Pb Dating of Paleosol Calcite and Implications for Cycle Duration

RASBURY, TROY E., GILBERT N. HANSON, WILLIAM E. HOLT, SUNY at Stony Brook; ROBERT H. GOLDSTEIN, University of Kansas; ARTHUR H. SALLER, Unocal Corporation.

Summary

We use well studied cycle stratigraphy from two marine sections of west Texas and southeast New Mexico combined with precise 238U/206Pb ages of multiple caliche samples to constrain the Carboniferous-Permian (Carb-Perm) and Pennsylvanian-Permian (Penn-Perm) boundaries at 301±2 and 3022±2.4 Ma (2s) respectively. Our ages also constrain the Missourian-Virgilian boundary at 307±3 Ma (2s). Although only the Carb-Perm boundary is directly correlative with the European section, our ages are consistent with the Carb-Perm boundary estimate of 300±7 Ma (2s) from Hess and Lippolt (1986) based on Ar-Ar ages of sanidines from a German section. Our ages give an average cycle duration of 152±64 ky, similar to Pleistocene glacio-eustatic cycle duration.

AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah