Calcareous nannofossil bioevents and microtektite stratigraphy in the Western Philippine Sea during the Quaternary

Abstract

Two sediment cores, MD06-3050 and MD06-3047, were analyzed to study the Quaternary calcareous nannofossil and microtektite records. We dated bioevents and the microtektite impact event by calibrating with oxygen isotope stratigraphy. Seven calcareous nannofossil bioevents were identified over the past 2.36 Ma including the last appearance of data for Discoaster brouweri, Calcidiscus macintyrei, large Gephyrocapsa and Pseudoemiliania lacunosa, the first appearance of data for large Gephyrocapsa and Emiliania huxleyi, and the abrupt increase in the abundance of Gephyrocapsa caribbeanica. In addition, we fortunately observed that Australasian microtektites were distributed in core MD06-3050 from 1340 to 1374 cm.Western Philippine Sea, Quaternary Period, calcareous nannofossil biostratigraphy, oxygen isotope stratigraphy, Australasian microtektites Citation:Sun H J, Li T G, Sun R T, et al. Calcareous nannofossil bioevents and microtektite stratigraphy in the Western Philippine Sea during the Quaternary.

Sediment provenance and evolution of the East Asian winter monsoon since 700 ka recorded by major elements in the West Philippine Sea

“…Therefore, the study core spans Marine Isotope Stages (MIS) 1-17, thus recording the paleoceanographic history of the last 696 ka with an average time resolution of 0.78 ka/cm. Besides, the validity of this chronology has also been confirmed by identification results on calcareous nannofossil bioevents [16].…”

“…It contains continuous sedimentation with no obvious gap or abrupt interruption. For the study core is located above the lysocline (3400 m) therein, carbonate is well preserved in the study core [16].…”

Abundance Biozones and Community Structures in the Upper Quaternary of Odp Hole 994c (Blake Ridge, Western Atlantic Ocean) Compared With Marine Isotope Stages, Glacial Cycles, and Terminations

“…The first appearance of Em. huxleyi has subsequently been placed between 0.262-0.264 Myr (Sun et al, 2011). Okada (2000) found a rapid and abrupt alteration of the flora in the earlier Pleistocene and concluded that the waters overlying Site 994 fluctuated between oligotrophic gyre waters with strong stratification and mesotrophic gyre margin waters with moderate upwelling events.…”

Quantifying Assemblage Turnover and Species Contributions at Ecologic Boundaries

“…This indicates a depositional rate of 3.5 cm/ka in the uppermost part of the Hole. The first appearance of E. huxleyi has subsequently been placed between 0.262–0.264 Myr [34].…”