Details
| Original language | English |
|---|---|
| Pages (from-to) | 401-409 |
| Number of pages | 9 |
| Journal | TERRA NOVA |
| Volume | 21 |
| Issue number | 5 |
| Publication status | Published - Oct 2009 |
| Externally published | Yes |
Abstract
Sr-isotope measurements of unaltered oyster shell calcite using laser-ablation multi-collector ICPMS techniques represent a powerful tool capable of establishing a chronostratigraphic framework for fossil near-shore deposits. This approach is tested on two shoal-water successions from the Portuguese Algarve and Lusitanian basins covering Late Barremian to Albian strata. 87Sr/86Sr values derived from low-Mg calcite of oyster shells fluctuate between 0.70717 ± 0.00001 and 0.70746 ± 0.00002; absolute values as well as stratigraphic trends match well with the global open-marine seawater signal. The new Sr-isotope results in combination with existing bio- and chemostratigraphic records allow for identification of an Early Aptian biocalcification crisis at both studied localities and show that this event has severely affected coastal environments along the evolving Atlantic. Siliciclastic intervals in the Algarve section are interpreted as near-shore equivalents of enhanced detrital shedding into shelf and deep-sea environments as a consequence of increased chemical weathering rates during humid climate episodes.
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In: TERRA NOVA, Vol. 21, No. 5, 10.2009, p. 401-409.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Improved time control on Cretaceous coastal deposits
T2 - New results from Sr isotope measurements using laser ablation
AU - Burla, Stefan
AU - Oberli, Felix
AU - Heimhofer, Ulrich
AU - Wiechert, Uwe
AU - Weissert, Helmut
PY - 2009/10
Y1 - 2009/10
N2 - Sr-isotope measurements of unaltered oyster shell calcite using laser-ablation multi-collector ICPMS techniques represent a powerful tool capable of establishing a chronostratigraphic framework for fossil near-shore deposits. This approach is tested on two shoal-water successions from the Portuguese Algarve and Lusitanian basins covering Late Barremian to Albian strata. 87Sr/86Sr values derived from low-Mg calcite of oyster shells fluctuate between 0.70717 ± 0.00001 and 0.70746 ± 0.00002; absolute values as well as stratigraphic trends match well with the global open-marine seawater signal. The new Sr-isotope results in combination with existing bio- and chemostratigraphic records allow for identification of an Early Aptian biocalcification crisis at both studied localities and show that this event has severely affected coastal environments along the evolving Atlantic. Siliciclastic intervals in the Algarve section are interpreted as near-shore equivalents of enhanced detrital shedding into shelf and deep-sea environments as a consequence of increased chemical weathering rates during humid climate episodes.
AB - Sr-isotope measurements of unaltered oyster shell calcite using laser-ablation multi-collector ICPMS techniques represent a powerful tool capable of establishing a chronostratigraphic framework for fossil near-shore deposits. This approach is tested on two shoal-water successions from the Portuguese Algarve and Lusitanian basins covering Late Barremian to Albian strata. 87Sr/86Sr values derived from low-Mg calcite of oyster shells fluctuate between 0.70717 ± 0.00001 and 0.70746 ± 0.00002; absolute values as well as stratigraphic trends match well with the global open-marine seawater signal. The new Sr-isotope results in combination with existing bio- and chemostratigraphic records allow for identification of an Early Aptian biocalcification crisis at both studied localities and show that this event has severely affected coastal environments along the evolving Atlantic. Siliciclastic intervals in the Algarve section are interpreted as near-shore equivalents of enhanced detrital shedding into shelf and deep-sea environments as a consequence of increased chemical weathering rates during humid climate episodes.
UR - http://www.scopus.com/inward/record.url?scp=70350092539&partnerID=8YFLogxK
U2 - 10.1111/j.1365-3121.2009.00897.x
DO - 10.1111/j.1365-3121.2009.00897.x
M3 - Article
AN - SCOPUS:70350092539
VL - 21
SP - 401
EP - 409
JO - TERRA NOVA
JF - TERRA NOVA
SN - 0954-4879
IS - 5
ER -