tic de The dominance of high-latitude planktonic foraminiferal indices in the megabreccia-bearing intervals is more difficult to palaeogeographical configurations and ocean circula- mental and palaeoceanographic studies on the Eocene Epoch have mainly focused on either the warm climates sition (e.g....
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.525.6793 http://wzar.unizar.es/isps/pdf/Payros2006Palaeo3.pdf |
| Summary: | tic de The dominance of high-latitude planktonic foraminiferal indices in the megabreccia-bearing intervals is more difficult to palaeogeographical configurations and ocean circula- mental and palaeoceanographic studies on the Eocene Epoch have mainly focused on either the warm climates sition (e.g. Wing et Palaeogeography, Palaeoclimatology, Palaeoetion patterns, and eventually led to a switch from green-interpret. Such dominance might record global cooling episodes that resulted in eustatic lowstand resedimentation events. However, the climatic cooling and sea-level fall do not fully explain the characteristics of these intervals. A reasonable scenario is that tectonically induced resedimentation processes resuspended large volumes of mud and organic matter, which led to the eutrophication of seawater. Such eutrophication would preferentially affect low-latitude oligotrophic planktonic foraminiferal species and lead to a relative or absolute increase in the cosmopolitan opportunistic species that typify high-latitude groups. |
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