Paleoenvironmental implications of high-density records in Co-rich seamount crusts from the Pacific Ocean |
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| Authors: | XiaoHong Wang LiPing Zhou YiMin Wang XueHua Zhang XiaoMing Liu XingTao Fan KeXin Liu and JianXiong Zhou |
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| Abstract: | Co-rich seamount crusts have been shown to possess great potential for providing information on pa- leoceanographic and paleoclimatic changes. High resolution data are essential to decipher and correctly understand such high-density records. With the development of modern micro-probe techniques, de- tailed sampling of crusts can be performed and it is possible to retrieve detailed information about envi- ronmental changes recorded in the seamount crusts. We report here geochemical results of more than 40 elements (including all rare earth elements) of four Co-rich seamount crust samples, which were collected from seamounts in the central and western Pacific Ocean. These data were obtained with two micro-probe techniques: Electron Probe Micro Analyzer and Laser Ablation Inductively Coupled Plasma Mass Spec- trometry. The chronological framework of the seamount crust samples was determined using the cos- mogenic 10Be and the Co-chronometer. Records of elemental composition, P, and Al/(Fe Mn) and Y/Ho ratios across the sections of the four samples are used to identify paleoceanographic and paleoclimatic events over the past ~30 Ma. These data show that: (1) Al/(Fe Mn) in the western Pacific seamount crust is a useful proxy for the assessment of changes of source materials related to the variability of the Asian monsoon; (2) P and Y/Ho can be used as proxies to infer biogenic episodes. Finally we discuss the methodology related to dating and micro-probe analysis used in crust study. |
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| Keywords: | Co-rich seamount crust micro-probe chronology geochemical record paleo-oceanic environment |
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