Variations of opal accumulation rates and paleoproductivity over the past 12 Ma at ODP Site 1143, southern South China Sea

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doi: 10.1360/02tb9137
Author(s): Li Jianru; Wang Rujian; Li Baohua
Author Affiliation(s): Primary:
Tongji University, Laboratory of Marine Geology, Shanghai, China
Chinese Academy of Sciences, China
Volume Title: Chinese Science Bulletin
Source: Chinese Science Bulletin, 47(7), p.596-598. Publisher: Science Press, Beijing, China. ISSN: 1001-6538
Note: In English. 17 refs.; illus., incl. 2 tables
Summary: The biogenic silica analysis was performed on 463 samples from ODP 184 Site 1143, the southern South China Sea. The results show that the opal content and MAR evidently increased between 12.3 and 5.7 Ma, which was contemporary with the high carbonate and total MARs, reflecting the high biogenic productivity in the late Miocene. This demonstrates the occurrence of the late Miocene "Biogenic Bloom Event" in the southern South China Sea, corresponding to the late Miocene-early Pliocene "Biogenic Bloom Event" in the Indian-Pacific Ocean. The increases of opal content and MAR after the middle Pleistocene (about 0.7 Ma) is inferred to result from the enhanced upwelling and nutrient supply, which was induced by the intensified monsoon circulation after the "Mid-Pleistocene Revolution".
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Cenozoic; Event stratigraphy; Framework silicates; Leg 184; Marine sedimentation; Miocene; Neogene; North Pacific; Northwest Pacific; ODP Site 1143; Ocean Drilling Program; Opal; Pacific Ocean; Paleo-oceanography; Productivity; Sedimentation; Sedimentation rates; Sequence stratigraphy; Silica minerals; Silicates; South China Sea; Tertiary; Upper Miocene; Variations; West Pacific
Coordinates: N092143 N092143 E1131707 E1131707
Record ID: 2003079115
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