南海神狐海域水合物钻探区钙质超微化石生物地层与沉积速率

陈芳; 苏新; 周洋

doi:10.3799/dqkx.2013.001

Volume 38 Issue 1

Jan. 2013

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Article Navigation > Earth Science > 2013 > 38(1): 1-9

HU Zhen, WANG Yong, 2006. City Planning Spatial Decision Platform Based on GIS. Earth Science, 31(5): 699-703.

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CHEN Fang, SU Xin, ZHOU Yang, 2013. Late Miocene-Pleistocene Calcareous Nannofossil Biostratigraphy of Shenhu Gas Hydrate Drilling Area in the South China Sea and Variations in Sedimentation Rates. Earth Science, 38(1): 1-9. doi: 10.3799/dqkx.2013.001

HU Zhen, WANG Yong, 2006. City Planning Spatial Decision Platform Based on GIS. Earth Science, 31(5): 699-703.

Citation:

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Late Miocene-Pleistocene Calcareous Nannofossil Biostratigraphy of Shenhu Gas Hydrate Drilling Area in the South China Sea and Variations in Sedimentation Rates

doi: 10.3799/dqkx.2013.001

CHEN Fang^{1, 2
,},
SU Xin³,
ZHOU Yang^{1, 2}

1.
Guangzhou Marine Geological Survey, Guangzhou 510760, China
2.
Key Laboratory of Subseafloor Mineral Resources and Geological Environment, Ministry of Land and Resources, Guangzhou 510760, China
3.
School of Marine Geosciences, China University of Geosciences, Beijing 100083, China

Received Date: 2012-03-16
Publish Date: 2013-01-15

Abstract

Abstract

The first Chinese gas hydrate drilling program was carried out on the Shenhu area in 2007 and obtained gas hydrate samples. In order to understand the strata, age of the zone of gas hydrate occurrence and features of sedimentation rates, Late Miocene to Pleistocene calcareous nanofossil biostratigraphy in 4 holes (SH1B, SH2B, SH5C and SH7B) from the Shenhu gas hydrate drilling area of the northern South China Sea have been studied. A total of 17 Late Miocene to Pleistocene nanofossil events are recognized. The oldest sediments recovered are in an age of late Miocene, younger than 7.362 Ma, and the age assigned for gas hydrate occurrence zone is late Miocene in Hole SH2B and late Miocene to early Pliocene in Hole SH7B. Sedimentation rates varied with holes and times, increasing from Pliocene, and reaching the highest values in Holocene, for example, 1.88-3.27 cm/ka during Pliocene and 20-34.16 cm/ka in Holocene, respectively. Sedimentation rates of 1.88 cm/ka to 4.18 cm/ka were estimated for sediment sequences in gas hydrate occurrence zone. The results suggest that the relationship between sedimentation rates and occurrence of gas hydrates should be more complicated than our earlier knowledge.
- calcareous nannofossil biostratigraphy,
- sedimentation rate,
- gas hydrate occurrence zone,
- Miocene,
- Shenhu area,
- South China Sea

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Late Miocene-Pleistocene Calcareous Nannofossil Biostratigraphy of Shenhu Gas Hydrate Drilling Area in the South China Sea and Variations in Sedimentation Rates

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