Calcareous nannofossil stratigraphy and molecular fossils in the Co-rich ferromanganese crust from the Western Pacific

Chen Ronghua; Zhao Qingying; Zhang Haisheng; Lu Bing; Pulyaeva I A

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Chen Ronghua, Zhao Qingying, Zhang Haisheng, Lu Bing, Pulyaeva I A. Calcareous nannofossil stratigraphy and molecular fossils in the Co-rich ferromanganese crust from the Western Pacific[J]. Haiyang Xuebao, 2015, 37(7): 132-141.

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Calcareous nannofossil stratigraphy and molecular fossils in the Co-rich ferromanganese crust from the Western Pacific

1.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Federal State Unitary Geological Enterprise "Kavkazgeolsyomka" Pyatigorsk, Russia

Received Date: 2014-06-25
Rev Recd Date: 2015-02-10

Abstract

Abstract

Calcareous nannofossils biostratigraphy was studied on a sample of Co-rich ferromanganese crust,CM3D06,from the Magellanseamounts in the Western Pacific. The occurrences of classic calcareous nannofossils,which can typically represent the eras from the late Cretaceous to the Pleistocene,indicate that the crust has started forming in the Late Cretaceous. A suit of molecular fossils,including n-alkane,isoprenoid hydrocarbon and sterane,were detected in the Co-rich ferromanganese crust. Features of the molecular characteristics index,MH,ΣC₂₃^-/C₂₄⁺、CPI 、Pr/Ph、Pr/nC₁₇、Ph/nC₁₈和nC₃₁/nC₁₇ suggest the organic source in the crust mainly from marine phytoplankton、zooplankton and benthic non-photosynthetic fungus. The proportion patterns of C₂₉、C₂₈ and C₂₇ of the sterol component show the rapid evolution of the organism population. The relationship between the growing of the crust and the changes in the oceanic environment was also addressed through the organic carbon isotope and Pr/Ph analyses on each layer of the crust.
- Late Cretaceous,
- Western Pacific,
- Co-rich ferromanganese crust,
- molecular fossils,
- carbon isotope,

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