globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2014.04.016
论文题名:
Productivity and sea-surface temperature changes recorded during the late Eocene-early Oligocene at DSDP Site 511 (South Atlantic)
作者: Plancq J.; Mattioli E.; Pittet B.; Simon L.; Grossi V.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 407
起始页码: 34
结束页码: 44
语种: 英语
英文关键词: Calcareous nannofossils ; DSDP Site 511 ; Lipid-biomarkers ; Paleotemperatures ; Productivity ; Upwelling conditions
英文摘要: This study investigates paleoenvironmental changes during the Eocene-Oligocene transition (EOT) at Deep Sea Drilling Project (DSDP) Site 511 (South Atlantic), as inferred from lipid biomarker (long-chain diols, alkenones) and calcareous nannofossil accumulation rates, as well as changes in sedimentation regime (i.e. relative contributions of total organic carbon-TOC-, calcium carbonate, and biogenic silica). Sea-surface temperatures (SSTs) reconstructed from the alkenone unsaturation index UK'37 indicate a progressive but significant cooling (~8°C) from 34.5Ma to 33.6Ma, consistent with estimates derived from other temperature proxies (TEX86; δ18O) at the same site and for the same time interval. This cooling is associated with a marked increase in primary productivity, as indicated by high accumulation rates of biogenic silica, TOC, alkenones, long-chain diols, and calcareous nannofossils. Together, these results are consistent with an enhancement of upwelling conditions favorable to the development of siliceous organisms at DSDP Site 511, possibly induced by the Oi-1 glaciation in Antarctica that occurred during this period. © 2014 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69312
Appears in Collections:过去全球变化的重建

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作者单位: Laboratoire de Géologie de Lyon, Terre, Planètes, Environnement (LGL-TPE), UMR CNRS 5276, Université Lyon 1, Ecole Normale Supérieure Lyon, Campus scientifique de la DOUA, 2 rue Dubois, 69622 Villeurbanne, France; Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA), UMR CNRS 5023, Université Lyon 1, ENTPE, Campus scientifique de la DOUA, 6 rue Dubois, 69622 Villeurbanne, France

Recommended Citation:
Plancq J.,Mattioli E.,Pittet B.,et al. Productivity and sea-surface temperature changes recorded during the late Eocene-early Oligocene at DSDP Site 511 (South Atlantic)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,407
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