DOI: 10.1016/j.palaeo.2019.109582
论文题名: Seawater paleotemperature and paleosalinity evolution in neritic environments of the Mediterranean margin: Insights from isotope analysis of bivalve shells
作者: Briard J. ; Pucéat E. ; Vennin E. ; Daëron M. ; Chavagnac V. ; Jaillet R. ; Merle D. ; de Rafélis M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 310182
出版年: 2020
卷: 543 语种: 英语
英文关键词: Clumped isotopes
; Coastal environment
; Hydrological cycle
; Middle Miocene Climatic Optimum
; Paleoclimate
Scopus关键词: benthic foraminifera
; bivalve
; coastal zone
; cooling
; Eocene-Oligocene boundary
; global climate
; historical record
; hydrological cycle
; ice sheet
; isotopic analysis
; Miocene
; Oligocene
; paleoclimate
; paleoenvironment
; paleosalinity
; paleotemperature
; reconstruction
; seawater
; shell
; subtidal environment
; Antarctica
; Liguro-Provencal Basin
; Mediterranean Sea
; Bivalvia
; Bryozoa
; Foraminifera
英文摘要: The first step of ice-sheet build-up on Antarctica at the Eocene-Oligocene boundary was followed by a phase of climate instability culminating during the Miocene with a warming event called the Middle Miocene Climate Optimum (MMCO), that ended with a marked cooling phase identified as the Middle Miocene Climate Transition (MMCT). While numerous benthic foraminifera δ18O and Mg/Ca data have been used to capture the global climate evolution during this interval of climate and ice-sheet instability, geochemical records from shallow-water carbonates still remain scarce. Yet such records are crucial to capture the diversity of regional environmental responses to global climate changes, and thus to better understand the behavior of our climate system during this critical interval. In this work, we test the potential of a multi-proxy approach (δ18O, clumped isotope (Δ47), strontium isotopes (87Sr/86Sr)) applied to bivalves recovered from the Liguro-Provencal Basin and Rhodano-Provencal basin (Northwestern of the Mediterranean Sea) to reconstruct the evolution of shallow seawater temperature and salinity in this region over the latest Oligocene to Middle Miocene interval (~10 Myrs). Our results highlight a local cooling in the northwestern Mediterranean Sea during the MMCO that contrasts with the warming observed in other regions, with seawater temperatures inferred from Δ47 analyses in the 13–18 °C range. These cool seawater temperatures recorded in the studied region during the MMCO are much cooler than those recorded in the open oceans, but are in agreement with the proliferation of bryozoan observed in the Castillon-Du-Gard area during this interval. Low bivalve δ18O values (−3.24‰ in average) are recorded during this episode are interpreted to reflect enhanced freshwater inputs, lowering local salinity and seawater δ18O. Such enhanced freshwater inputs point to a phase of enhanced hydrological cycle in the studied region, possibly linked to the global mid-Miocene warming event. Bivalve 87Sr/86Sr data mostly fall within the global seawater Sr isotope reference curve, but remain compatible with enhanced freshwater inputs during the Aquitanian and during the Langhian, as these inputs were probably not important enough to induce a large departure from the seawater curve at a regional scale. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158500
Appears in Collections: 气候变化与战略
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作者单位: Géosciences Environnement Toulouse (GET), Université Paul Sabatier Toulouse 3, CNRS UMR 5563, IRD, 14 avenue Edouard Belin, Toulouse, F-31400, France; Biogéosciences, UMR 6282, UBFC/CNRS, Université Bourgogne Franche-Comté, 6 boulevard Gabriel, Dijon, F-21000, France; Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS UVSQ, Université Paris-Saclay, Gif-sur-Yvette, F-91191, France; Muséum National d'Histoire Naturelle, UMR CRNS 7207 (CR2P-MNHN, CNRS, UPMC-Paris 6), Sorbonne Universités, 8 rue Buffon, Paris, F-75005, France
Recommended Citation:
Briard J.,Pucéat E.,Vennin E.,et al. Seawater paleotemperature and paleosalinity evolution in neritic environments of the Mediterranean margin: Insights from isotope analysis of bivalve shells[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2020-01-01,543