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North-Central Section - 35th Annual Meeting (April 23-24, 2001)

Paper No. 0
Presentation Time: 1:00 PM-4:30 PM

CARBON ISOTOPE CHEMOSTRATIGRAPHY OF ORDOVICIAN CARBONATES OF THE PLATTEVILLE, DECORAH, AND DUNLEITH FORMATIONS IN THE BIG SPRING #4 CORE, CLAYTON COUNTY, IOWA


HASIUK, Franciszek J.1, LUDVIGSON, Greg A.2, WITZKE, Brian J.3, CARPENTER, Scott J.4 and GONZALEZ, Luis A.4, (1)Geoscience, Univ of Iowa, 121 Trowbridge Hall, Iowa City, IA 52242-1379, (2)Iowa Geological Survey, Iowa Dept. Nat Rscs, 109 Trowbridge Hall, Iowa City, IA 52242-1319, (3)Iowa Dept. Natural Resources, Geol Survey Bureau, Iowa City, IA 52242, (4)Geoscience, Univ of Iowa, fhasiuk@blue.weeg.uiowa.edu

The Big Spring #4 drillcore in Clayton County, northeast Iowa, was sampled for carbon isotopic values of micritic carbonates as part of a regional study of the chemostratigraphy of Ordovician units in the Upper Mississippi Valley. Starting out from baseline values in the Platteville Formation of around -2 o/oo VPDB, the d13C rises to a peak of near 0 o/oo before falling to values of -2.5 to -3 o/oo in the uppermost few meters of the unit. Moving up into the Decorah Formation, values rise to around +0.5 o/oo in the Spechts Ferry Member. Then they dip to -0.5 o/oo before rising again to about +1 o/oo in the Guttenberg Member. In the Ion Member, the d13C stabilizes out to roughly -0.5 o/oo, which continues upward through our sampled interval of the Dunleith Formation.

Session No. 26--Booth# 23

Undergraduate Research – Sedimentology, Stratigraphy and Paleontology (Posters)
Tuesday, 24 April 2001: 1:00 PM-4:30 PM
Geological Society of America Abstracts with Programs. Vol. 33, No. 4, March 2001, p.52
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