Geochemical signatures in Late Triassic brachiopods from New Caledonia
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Geochemical signatures in Late Triassic brachiopods from New Caledonia. / Ullmann, C. V.; Campbell, H. J.; Frei, R.; Korte, C.
In: New Zealand Journal of Geology and Geophysics, Vol. 57, No. 4, 10.2014, p. 420-431.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Geochemical signatures in Late Triassic brachiopods from New Caledonia
AU - Ullmann, C. V.
AU - Campbell, H. J.
AU - Frei, R.
AU - Korte, C.
PY - 2014/10
Y1 - 2014/10
N2 - Brachiopod fossils from the sedimentary sequences of the Téremba Terrane (New Caledonia) provide a unique opportunity to study the environmental parameters of the Late Triassic. 87Sr/86Sr ratios, δ13C and δ18O values, and Sr/Ca, Mg/Ca and Mn/Ca ratios were measured on brachiopods from Oretian to Otapirian (Norian to Rhaetian) fossil localities of the Baie de St.-Vincent area. Post-depositional impacts on the geochemical proxies were investigated by analysing calcite cements and partly recrystallized shell material. Diagenetic fluids carried strontium with a low 87Sr/86Sr ratio of c. 0.7065, and light δ13C values of c.-20‰, suggesting major contributions by oxidized organic matter. Diagenetic equilibrium was reached at δ18O values of c.-12‰, very low Sr/Ca ratios of < 0.05 mmol/mol and locally variable Mn/Ca ratios of up to 5.9 mmol/mol. Results from the best-preserved samples suggest that calcification temperatures of Warepan and Otapirian brachiopods from New Caledonia were consistently ≥ 15 °C.
AB - Brachiopod fossils from the sedimentary sequences of the Téremba Terrane (New Caledonia) provide a unique opportunity to study the environmental parameters of the Late Triassic. 87Sr/86Sr ratios, δ13C and δ18O values, and Sr/Ca, Mg/Ca and Mn/Ca ratios were measured on brachiopods from Oretian to Otapirian (Norian to Rhaetian) fossil localities of the Baie de St.-Vincent area. Post-depositional impacts on the geochemical proxies were investigated by analysing calcite cements and partly recrystallized shell material. Diagenetic fluids carried strontium with a low 87Sr/86Sr ratio of c. 0.7065, and light δ13C values of c.-20‰, suggesting major contributions by oxidized organic matter. Diagenetic equilibrium was reached at δ18O values of c.-12‰, very low Sr/Ca ratios of < 0.05 mmol/mol and locally variable Mn/Ca ratios of up to 5.9 mmol/mol. Results from the best-preserved samples suggest that calcification temperatures of Warepan and Otapirian brachiopods from New Caledonia were consistently ≥ 15 °C.
KW - Sr/Sr
KW - Brachiopod
KW - Diagenesis
KW - New Caledonia
KW - Stable isotopes
KW - Trace elements
U2 - 10.1080/00288306.2014.958175
DO - 10.1080/00288306.2014.958175
M3 - Journal article
AN - SCOPUS:84911954439
VL - 57
SP - 420
EP - 431
JO - New Zealand Journal of Geology, and Geophysics
JF - New Zealand Journal of Geology, and Geophysics
SN - 0028-8306
IS - 4
ER -
ID: 138422843