中太平洋海山区富钴结壳的钙质超微化石地层学研究

苏新; 马维林; 程振波

Volume 29 Issue 2

Mar. 2004

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Article Navigation > Earth Science > 2004 > 29(2): 141-147

SU Xin, MA Wei-lin, CHENG Zhen-bo, 2004. Calcareous Nannofossil Biostratigraphy for Co-Rich Ferromanganese Crusts from Central Pacific Seamounts. Earth Science, 29(2): 141-147.

Citation:

SU Xin, MA Wei-lin, CHENG Zhen-bo, 2004. Calcareous Nannofossil Biostratigraphy for Co-Rich Ferromanganese Crusts from Central Pacific Seamounts. Earth Science, 29(2): 141-147.

SU Xin, MA Wei-lin, CHENG Zhen-bo, 2004. Calcareous Nannofossil Biostratigraphy for Co-Rich Ferromanganese Crusts from Central Pacific Seamounts. Earth Science, 29(2): 141-147.

Citation:

SU Xin, MA Wei-lin, CHENG Zhen-bo, 2004. Calcareous Nannofossil Biostratigraphy for Co-Rich Ferromanganese Crusts from Central Pacific Seamounts. Earth Science, 29(2): 141-147.

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Calcareous Nannofossil Biostratigraphy for Co-Rich Ferromanganese Crusts from Central Pacific Seamounts

1.
Key Laboratory ofLithospheric Tectonics Deep-Level Process, China University ofGeosciences, Beijing 100083, China
2.
The Second Institute ofOceanography and Key Laboratory ofSeafloor Science, National Oceanography Bureau, Hangzhou 310012, China
3.
The First Institute ofOceanography, National Oceanography Bureau, Qingdao 266071, China

Received Date: 2004-01-13
Publish Date: 2004-03-25

Abstract

Abstract

Calcareous nannofossils in 2 Co-rich ferromanganese crusts, N1-15 and N5E-06, from the central Pacific seamounts were analyzed in order to estimate their depositional ages. These 2 crusts show 3 structural layers: compact upper layer, porous middle layer and compact lower layer. 12 Tertiary to Quaternary nannofossil eventswere recognized. The upper layers of these 2 crustswere deposited since Late Pleistocene, while their middle layers were formed from Pliocene to Middle Pleistocene. The age of the lowest sample from N5E-06 crustwas estimated as 55.3-59.7 Ma in the Middle to Late Paleocene, and the duration for lower part of the lower layer was given between 59.7-32.8 Ma from the Middle Paleocene and Early Oligocene.For the lower layerof N1-15 crust, the age was roughly determined to be Miocene, due to the lack of reliable fossils. This study notes that no reliable Late Oligocene to Miocene nannofossil markers were found in these 2 crusts. Furthermore, sedimentation hiatus was observed.
- Co-rich ferromanganese crust,
- calcareous nannofossil,
- biostratigraphy research,
- central Pacific seamount

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References(12)

References

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