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Carbon isotopes across the Eocene‐Oligocene boundary sequence of Kutch, western India: Implications to oceanic productivity and pCO2 change
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| Zeitschriftentitel: | Geophysical Research Letters |
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| Personen und Körperschaften: | , , , |
| In: | Geophysical Research Letters, 30, 2003, 11 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| Zusammenfassung: | <jats:p>Analyses of foraminiferal δ<jats:sup>18</jats:sup>O (δ<jats:sup>18</jats:sup>O<jats:sub>carb</jats:sub>), δ<jats:sup>13</jats:sup>C (δ<jats:sup>13</jats:sup>C<jats:sub>carb</jats:sub>) and bulk organic matter (δ<jats:sup>13</jats:sup>C<jats:sub>org</jats:sub>) across a tropical Eocene/Oligocene boundary (EOB) section from Kutch basin, western India show that the ocean cooling (at least ∼3°C) is coincident with a rapid enrichment (∼3‰) in δ<jats:sup>13</jats:sup>C<jats:sub>org</jats:sub> but depletion (∼1.5‰) in δ<jats:sup>13</jats:sup>C<jats:sub>carb</jats:sub>. The decrease in pCO<jats:sub>2</jats:sub> in ocean‐atmosphere system across the boundary, possibly resulting from enhanced silicate weathering in rising Himalayas and accompanied organic carbon burial in ocean, caused the cooling and δ<jats:sup>13</jats:sup>C<jats:sub>org</jats:sub> enrichment. The end‐Eocene climatic stress decreased the oceanic productivity (and δ<jats:sup>13</jats:sup>C<jats:sub>carb</jats:sub>) eventually causing extinction of larger benthic foraminiferal community. The data suggest a critical role of tropical ocean and direct forcing of CO<jats:sub>2</jats:sub> on global climate change at least for this crucial Cenozoic transition.</jats:p> |
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| ISSN: |
0094-8276
1944-8007 |
| DOI: | 10.1029/2002gl016541 |