MOLECULAR FOSSIL AND NANNOFOSSIL RECORDS IN A Co-RICH CRUST OF WEST PACIFIC SEAMOUNTS: IMPLICATION FOR STRATIGRAPHIC DIVISION AND PALEOECOLOGY AND PALEOENVIRONMENT

ZHAO Jun; ZHANG Haisheng; YU Peisong; WU Guanghai; LU Bing; Pulyaeva I A

doi:10.3724/SP.J.1140.2014.02095

2014 Vol. 34, No. 2

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Article navigation > Marine Geology & Quaternary Geology > 2014 > 34(2): 95-103

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ZHAO Jun, ZHANG Haisheng, YU Peisong, WU Guanghai, LU Bing, Pulyaeva I A. MOLECULAR FOSSIL AND NANNOFOSSIL RECORDS IN A Co-RICH CRUST OF WEST PACIFIC SEAMOUNTS: IMPLICATION FOR STRATIGRAPHIC DIVISION AND PALEOECOLOGY AND PALEOENVIRONMENT[J]. Marine Geology & Quaternary Geology, 2014, 34(2): 95-103. doi: 10.3724/SP.J.1140.2014.02095

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ZHAO Jun, ZHANG Haisheng, YU Peisong, WU Guanghai, LU Bing, Pulyaeva I A. MOLECULAR FOSSIL AND NANNOFOSSIL RECORDS IN A Co-RICH CRUST OF WEST PACIFIC SEAMOUNTS: IMPLICATION FOR STRATIGRAPHIC DIVISION AND PALEOECOLOGY AND PALEOENVIRONMENT[J]. Marine Geology & Quaternary Geology, 2014, 34(2): 95-103. doi: 10.3724/SP.J.1140.2014.02095

MOLECULAR FOSSIL AND NANNOFOSSIL RECORDS IN A Co-RICH CRUST OF WEST PACIFIC SEAMOUNTS: IMPLICATION FOR STRATIGRAPHIC DIVISION AND PALEOECOLOGY AND PALEOENVIRONMENT

1. Key Laboratory of Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012;
2. State Scientific Centre Yuzhmorgeologia, Gelendzhik 353461, Russia

Received Date: 23 February 2013

Revised Date: 08 June 2013

Abstract

Abstract

Calcareous nannofossils in CM1D03 Co-rich crust of west Pacific Seamounts were analyzed to esimate the stratigraphic ages. The results showed that the lower layer was formed in the late Paleocene-early Eocene (54~51 Ma), whereas the porous middle layer was formed in the middle Eocene (45~40 Ma) and the upper layer was in the Miocene-Pliocene (22~2.4 Ma) and the Pliocene-Pleistocene (3.6~1.2 Ma). The molecular fossils, including chloroform bitumen "A", n-alkanes, isoprenoids, steranes, in the Co-rich crust were measured using gas chromatography and gas chromatography-mass spectrum. The source composition, depositional environment and palaeoecological community succession in the Co-rich crust during its growth have been discussed by analyzing the characteristics of these fine molecules (C27, C28, and C29 steranes) and their molecular indices (ΣC23-/ΣC24+, CPI and Pr/Ph) with consideration of the variation in organic carbon (TOC) content and its stable isotope compositions (δ13C) records. The results showed that chloroform bitumen "A"/TOC ("A"/C) ratio was 10.51%~21.74%, showing significant hydrocarbon transport pattern. The ratio of ΣC23-/ΣC+24 for n-alkanes was 0.74~1.47,the CPI was 0.80~1.45, and the value of δ13C was -24.00‰~-25.48‰, indicating that organic matter in the Co-rich crust mainly origined from phytoplankton. The results also indicated that the source of organic matter, C27, C28, and C29 steranes distribution variation, TOC preservation and δ13C were related to changes in marine environment, global climate and Antarctic Bottom Water during the formation of Co-rich crust.
- Co-rich crust /
- molecular fossil /
- calcareous nannofossil /
- paleoecology and paleoenvironment /
- West Pacific semount

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