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Paleoenvironmental implications of high-density records in Co-rich seamount crusts from the Pacific Ocean

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Abstract

Co-rich seamount crusts have been shown to possess great potential for providing information on paleoceanographic 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, detailed sampling of crusts can be performed and it is possible to retrieve detailed information about environmental 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 Spectrometry. The chronological framework of the seamount crust samples was determined using the cosmogenic 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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Correspondence to XiaoHong Wang.

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Supported by the Key Laboratory of Marine Sedimentology and Environmental Geology, State Oceanic Administration (Grant No. MASEG200602), China Ocean Mineral Resources Research and Development Association (Grant No. DY105-01-04-05) and Programme of Excellent Young Scientists of the Ministry of Land and Resources

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Wang, X., Zhou, L., Wang, Y. et al. Paleoenvironmental implications of high-density records in Co-rich seamount crusts from the Pacific Ocean. Sci. China Ser. D-Earth Sci. 51, 1460–1469 (2008). https://doi.org/10.1007/s11430-008-0092-6

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  • DOI: https://doi.org/10.1007/s11430-008-0092-6

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