TY - JOUR
T1 - Late Pennsylvanian seasonality reflected in the 18 O and elemental composition of a brachiopod shell
AU - Horng-Sheng Mii, Mii
AU - Grossman, E. L.
PY - 1994
Y1 - 1994
N2 - To evaluate the potential for the study of Late Pennsylvanian seasonality, detailed isotopic and elemental analyses were performed on a single specimen of the brachiopod Neospirifer dunbari. Contours of 18 O, Mg, Na, and S concentrations parallel growth bands and reveal a record of 1 1/2 to 2 cycles. Mg, S, and Na contents varied inversely with δ 18 O. This trend is opposite to the expected diagenetic trend and is consistent with the temperature dependences of Mg content and δ 18 O, thus implying preservation of shell chemistry. The ~1.2‰ range in δ 18 O values suggests a seasonal temperature variation of 5 to 6°C. This high seasonality for the tropical epicontinental sea of Kansas supports climate-model predictions of enhanced continentality in Pangean climate. -Authors
AB - To evaluate the potential for the study of Late Pennsylvanian seasonality, detailed isotopic and elemental analyses were performed on a single specimen of the brachiopod Neospirifer dunbari. Contours of 18 O, Mg, Na, and S concentrations parallel growth bands and reveal a record of 1 1/2 to 2 cycles. Mg, S, and Na contents varied inversely with δ 18 O. This trend is opposite to the expected diagenetic trend and is consistent with the temperature dependences of Mg content and δ 18 O, thus implying preservation of shell chemistry. The ~1.2‰ range in δ 18 O values suggests a seasonal temperature variation of 5 to 6°C. This high seasonality for the tropical epicontinental sea of Kansas supports climate-model predictions of enhanced continentality in Pangean climate. -Authors
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U2 - 10.1130/0091-7613(1994)022<0661:LPSRIT>2.3.CO
DO - 10.1130/0091-7613(1994)022<0661:LPSRIT>2.3.CO
M3 - Article
AN - SCOPUS:84874955758
SN - 0091-7613
VL - 22
SP - 661
EP - 664
JO - Geology
JF - Geology
IS - 7
ER -