Research Summary:

Examined blocky calcite cement (in cathodoluminescence shown to the left) from the Suwannee Terrane (southeastern Alabama, Florida) is interpreted to represent a variable physical mixture of calcite cement that precipitated from Ordovician middle-to-high latitude meteoric and marine fluid end-members. Consequently, our isotope data supports the interpretation that the Suwannee Terrane was an exotic terrane relative to low latitude Laurentia during the early Paleozoic.

Paper:

Tobin, K.J., and Walker, K.R., 1997, Blocky calcite cement from the Suwannee Terrane: evidence for mixing of moderate to high latitude meteoric and sea water. Carbonates and Evaporites, 12: 125-129.

Abstract:

Tobin, K.J., 2002, Calcite cement from the Suwannee Terrane and Ordovician paleogeography. Texas Academy of Science.