Plio-Pleistocene Planktic Foraminiferal Biochronology of ODP Site 762B, Exmouth Plateau, Southeast Indian Ocean

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
Ashutosh Kumar Singh, D. K. Sinha
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引用次数: 0

Abstract

The Indonesian Throughflow region connects the tropical Pacific Ocean with the eastern Indian Ocean, and variability of the Throughflow during the Plio-Pleistocene has been related to major climate shifts at the global level. Planktic foraminiferal biostratigraphy integrated with magnetochronology provides a robust time framework for assigning age control to major paleoceanographic events. Understanding of the coupled histories of the El Niño Southern Oscillation, Western Pacific Warm Pool, Indonesian Throughflow, and the eastern Indian Ocean has greatly benefitted from the chronological framework provided by planktic foraminiferal biostratigraphies from these regions. Ocean Drilling Program (ODP) Hole 762 lies under the influence of the Leeuwin Current, originating from the Indonesian Throughflow. Multiproxy data have been collected from Hole 762B and other nearby sites for paleoceanographic interpretation. However, a detailed planktic foraminiferal biostratigraphy integrated with magnetochronology is not available from this site. We provide here the sequential order of planktic foraminiferal First Occurrence (FO) and Last Occurrence (LO) events, which allowed us to divide the examined section into seven biostratigraphic zones. The biostratigraphy was integrated with magnetostratigraphy using revised ages of magnetochrons, which yielded biochronological age estimates for planktic foraminiferal events. A major planktonic faunal turnover between 3.4 and 2.7 Ma is probably related to the onset of the Northern Hemisphere glaciation and related changes in the Indonesian Throughflow. We have compared our numerical age estimates with published ages from other parts of the world. The diachronism observed probably is related to the local oceanographic setting of ODP Hole 762B, which has been alternatively influenced by changing strengths of the warm Leeuwin Current and the cold west Australian Current. The biochronology established here will be useful for correlating paleoceanographic events in the region.
东南印度洋埃克斯茅斯高原ODP遗址762B上更新世浮游生物有孔虫生物年代学
印度尼西亚通流区连接着热带太平洋和东印度洋,其在上新世—更新世的变化与全球范围内的重大气候变化有关。浮游有孔虫生物地层学与磁年代学相结合,为确定主要古海洋事件的年龄控制提供了强有力的时间框架。了解El Niño南方涛动、西太平洋暖池、印度尼西亚通流和东印度洋的耦合历史,很大程度上得益于这些地区浮游有孔虫生物地层学提供的年代框架。海洋钻探计划(ODP) 762号孔受到源自印度尼西亚通流的Leeuwin洋流的影响。从762B洞和附近其他地点收集了多个代理数据,用于古海洋解释。然而,该地点没有详细的浮游有孔虫生物地层学和磁年代学。我们在这里提供了浮游有孔虫首次出现(FO)和最后出现(LO)事件的顺序,使我们能够将所检查的剖面划分为七个生物地层带。将生物地层学与磁地层学结合起来,利用修正的磁时线年龄,得出浮游有孔虫事件的生物年代学年龄。3.4 ~ 2.7 Ma之间的一次主要浮游动物更替可能与北半球冰期的开始和印度尼西亚通流的相关变化有关。我们将我们的数字年龄估计与世界其他地区公布的年龄进行了比较。观测到的历时性可能与ODP 762B孔的局地海洋环境有关,该环境受到温暖的Leeuwin流和寒冷的西澳大利亚流强度变化的交替影响。这里建立的生物年代学将有助于对比该地区的古海洋事件。
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
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