Miocene planktonic foraminifera of ODP Hole 130-806B ...
We document the waxing and waning of a “proto-warm pool” in the western equatorial Pacific (WEP) based on a study of multi-species planktic foraminiferal isotope ratios and census data spanning the 13.2–5.8 Ma interval at ODP Site 806. We hypothesize that the presence or absence of a proto-warm pool...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2009
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.775951 https://doi.pangaea.de/10.1594/PANGAEA.775951 |
| Summary: | We document the waxing and waning of a “proto-warm pool” in the western equatorial Pacific (WEP) based on a study of multi-species planktic foraminiferal isotope ratios and census data spanning the 13.2–5.8 Ma interval at ODP Site 806. We hypothesize that the presence or absence of a proto-warm pool in the WEP, caused by the progressive tectonic constriction of the Indonesian Seaway and modulated by sea level fluctuations, created El Niño/La Niña-like alternations of hydrographic conditions across the equatorial Pacific during the late Miocene. This hypothesis is supported by the general antithetical relationship observed between carbonate productivity and preservation in the western and eastern equatorial Pacific, which we propose is caused by these alternating ocean–climate states. Warming of thermocline and surface waters, as well as a major change in planktic foraminferal assemblages record a two-step phase of proto-warm pool development ~11.6–10 Ma, which coincides with Miocene isotope events Mi5 and ... : Supplement to: Nathan, Stephen A; Leckie, R Mark (2009): Early history of the Western Pacific Warm Pool during the middle to late Miocene (~13.2-5.8 Ma): Role of sea-level change and implications for equatorial circulation. Palaeogeography, Palaeoclimatology, Palaeoecology, 274(3-4), 140-159 ... |
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