Subtropical to temperate late Neogene to Quaternary planktic foraminiferal biostratigraphy across the Kuroshio Current Extension, Shatsky Rise, northwest Pacific Ocean
| Autor: | R. Mark Leckie, Adriane R. Lam |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Geologic Sediments
010504 meteorology & atmospheric sciences Stratigraphy Marine and Aquatic Sciences Foraminifera Late Miocene 010502 geochemistry & geophysics Oceanography 01 natural sciences Paleooceanography Oceans Sedimentary Geology Multidisciplinary Ecology Temperature Eukaryota Biostratigraphy Geology Biodiversity Miocene Epoch Plankton Biological Evolution Medicine Research Article Northwestern United States Pleistocene Ecological Metrics Science Oceans and Seas Biozone Diachronous Neogene Animals 0105 earth and related environmental sciences Petrology Pacific Ocean Ecology and Environmental Sciences Organisms Biology and Life Sciences Paleontology Geologic Time Species Diversity Bodies of Water Invertebrates Boundary current Neogene Period Earth Sciences Cenozoic Era Sediment Quaternary |
| Zdroj: | PLoS ONE PLoS ONE, Vol 15, Iss 7, p e0234351 (2020) |
| ISSN: | 1932-6203 |
| Popis: | Planktic foraminiferal biostratigraphic zonation schemes are critical for providing first-order relative age control in deep-sea sediments and provide the basis on which to interpret evolutionary dynamics through time. Over the previous decades, the majority of published biostratigraphic zonation schemes focused on the tropical regions of the world. The mid-latitude or temperate regions, especially of the northwest Pacific, have been understudied in terms of recording plankton occurrences. Lack of detailed biostratigraphic studies have largely left out this region from plankton evolutionary analyses, thus how this part of the world ocean, which is characterized by the Kuroshio Current Extension (KCE), may contribute to global plankton biodiversity is unknown. In this study, we present the first magnetostratigraphically-calibrated late Neogene to Quaternary (15.12-0 Ma) planktic foraminiferal zonation schemes from the northwest Pacific for three Ocean Drilling Program Leg 198 holes (1207A, 1208A, and 1209A) that span the KCE. We utilize previously published warm subtropical, cool subtropical, and temperate zonation schemes from the southwest Pacific, with modifications. We find examples of significant diachroneity among primary marker taxa used to construct biozones at the three northwest Pacific sites, which ranges from 0.075 to 2.29 million years. Comparison of our primary datum markers with those of the tropical planktic foraminiferal zonation scheme also reveal diachroneity on the scale of 0.022 to 4.8 million years. We have identified times of intense dissolution in the northwest Pacific, namely in the middle to late Miocene that likely contribute to the observed diachroneity of datums. This study highlights the need for regionally specific mid-latitude biostratigraphic zonation schemes, as diachronous datums and differing assemblages may be hallmarks of oceanic ecotones created by major boundary current systems. These data also provide a framework to characterize local plankton evolutionary dynamics and paleobiogeographic patterns in future studies. |
| Databáze: | OpenAIRE |
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