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矿床地质  2002 

太平洋海山磷酸盐的锶同位素成分及形成年代

Keywords: 地球化学,大洋磷酸盐,锶同位素成分,形成年代,太平洋海山

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Abstract:

作者首次对太平洋不同海山上与富钴结壳伴生的各种产状的磷酸盐的锶同位素成分及其形成年代进行了深入研究。研究表明,我国调查区磷酸盐的87Sr/86Sr比值变化于0.70766至0.70842之间,形成年代相当于距今21Ma至39.5Ma。磷酸盐化作用主要发生在晚始新世_早渐新世及晚渐新世_早中新世期间。西、中太平洋磷酸盐形成年代的一致性揭示,自晚始新世至早中新世,在太平洋水下海山上曾发生过广泛的磷酸盐化作用,磷酸盐的形成是古海洋环境变迁的一个重要反映。

References

[1]  [1]Baturin G N.1982. Phosphorites on the sea floor: Origin,composition and distribution[M]. London: Elsevier.1~343.
[2]  [2]Burke W H,Denison D,Hetherington E A,et al. 1982. Variation of seawater 87Sr/86Sr throughout Phanerozoic time[J]. Geology,10: 516~519.
[3]  [3]Burns D A. 1984. Nannofossil dating and palaeoenvironmental interpretation of some Chatham Rise sediments collected on the Sonne-17 cruise[J]. Geol. Jahrbuch.,65:91~97.
[4]  [4]Hein J R,Yeh H W,Gunn S H,et al. 1993.Two major Cenozoic episodes of phosphogenesis recorded in equatorial Pacific seamount deposits[J]. Paleoceanography,8(2):293~311.
[5]  [5]Hodell D A,Mueller P A,Garrido J R,et al. 1991. Variations in the strontium isotopic composition of seawater during the Neogene[J].Geology,19:24~27.
[6]  [6]Marine Geological Department,Tongji University. 1989. Introduction to Paleoceanography[M]. Shanghai: Tongji University Publishing House. 316p(in Chinese).
[7]  [7]McArthur J M,Sahami A R,Thirlwall M,et al.1990. Dating phosphogenesis with strontium isotopes[J]. Geochim. Cosmochim. Acta,54:1343~1351.
[8]  [8]McMurtry G M,VonderHaar D L,Eisenhauer A,et al. 1994. Cenozoic accumulation history of a Pacific ferromanganese crust[J]. Earth and Planetary Science Letters,125:105~118.
[9]  [9]Murphy W E. 1989. Geochemistry and U-series geochronology of hydrothermal and hydrogeneous metal-rich deposits from the Pacific ocean[D]( M.S. Thesis). Univ.Hawaii.
[10]  [10]Peterman Z E,Hedge C E and Tourtelor H A. 1970. Isotopic composition of strontium in seawater throughout Phanerozoic time[J]. Geological Society of America Bulletin,34:105~120.
[11]  [11]Riggs S R. 1989. Phosphate deposits of the North Carolina coastal plain,continental shelf and adjacent Blake plateau,USA[A]. In:Notholt A J G,Sheldon,R P and Davidson D F,ed. Phosphate Deposits of the World,Vol. 2,Phosphate Rock Resources[C]. New York: Cambridge University Press. 42~52.
[12]  [12]Sharma P,Rama P and Moore W S. 1984. Spatial variation of U-Th series radionuclides and trace metals in deep-sea manganese encrustations[J]. Earth Planet. Sci. Lett.,67:319~326.
[13]  [13]Takashi I,Akira U,Yoshimichi K,et al. 1998. Strontium isotopic compositions and paleoceanographic implication of fossil manganese nodules in DSDP/ODP cores,Leg 1-126[J]. Geochimica et Cosmochimica Acta,62(8): 1545~1554.
[14]  [14]同济大学海洋地质系. 1989. 古海洋学概论[M]. 上海:同济大学出版社. 316页.

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