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地质论评  2002 

西太平洋富钴结壳形成年代的探讨

Keywords: 富钴结壳形成年代钙质微体化石太平洋生物地层法地层时代始新世

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Abstract:

本文为我国首次采用生物地层法探讨西太平洋麦哲伦海山区富钴结壳的生长年代,生物地层法计年的样品,取自厚度为97mm结壳的自顶至底的20mm,35mm,58mm,62mm及75mm处,结果表明。在62mm处发现了具地层时代鉴定意义的始新世早期Discoastermultiradiatus,Discoasterelegans,Discoasterbarbadiensis,Tribrachiatusorthostylus等钙质微体化石印痕,从而推断该区富钴结壳的生长年代可追朔至始新世或更老年代,此外,作者亦将此结果与中太平洋生物地层法的计年结果进行了对比并讨论了其地质意义。

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