DOI: 10.1016/j.gloplacha.2013.01.001
论文题名: Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications
作者: Scopelliti G. ; Bellanca A. ; Monien D. ; Kuhn G.
刊名: Global and Planetary Change
ISSN: 0921-8317
出版年: 2013
卷: 102 起始页码: 20
结束页码: 32
语种: 英语
英文关键词: Biogenic opal
; Element geochemistry
; Palaeoenvironment
Scopus关键词: Andrill
; Antarctica
; Austral summers
; Authigenic carbonates
; Biogenic opals
; Chemostratigraphy
; Diagenetics
; Drill core
; Early pliocene
; Element geochemistries
; Geological drilling
; Ice-free conditions
; Low degree
; Mcmurdo ice shelves
; Mn content
; Palaeoenvironment
; Pore waters
; Primary productivity
; Remobilization
; Sea floor
; Sediment sources
; Sedimentation rates
; Temperature drops
; Terrigenous inputs
; Volcaniclastic sediments
; Barium
; Cluster analysis
; Core drilling
; Geochemistry
; Lasers
; Lithology
; Oil shale
; Sedimentology
; Stratigraphy
; Sediments
; anoxic conditions
; barium
; biostratigraphy
; carbonate
; chemostratigraphy
; cluster analysis
; diamictite
; diatomite
; ice free corridor
; lithology
; marine isotope stage
; opal
; paleoenvironment
; Pliocene
; precipitation (chemistry)
; primary production
; provenance
; remobilization
; sedimentation rate
; vanadium
; volcaniclastic deposit
; zinc
; Antarctica
; East Antarctica
; McMurdo Ice Shelf
英文摘要: The AND-1B drill core (1285m-long) was recovered, inside the ANDRILL (ANtarctic geological DRILLing) Program, during the austral summer of 2006/07 from beneath the floating McMurdo Ice Shelf. Drilling recovered a stratigraphic succession of alternating diamictites, diatomites and volcaniclastic sediments spanning about the last 14Ma. A core portion between 350 and 480mbsf, including a 80m-thick diatomite interval recording the early Pliocene warming event, was investigated in term of opal biogenic content and element geochemistry. Across the diatomite interval, in spite of the lithological uniformity, a fluctuating biogenic opal profile mirrors the δ18O record, testifying a decrease in productivity when temperature drops as a consequence of small glacial fluctuations. The comparison of biogenic opal data with Chaetoceros spp. abundances from Konfirst et al. (2012) documents alternations between periods of high primary productivity in stratified surface waters and of enhanced terrigenous input in ice-free conditions. Cluster analysis discriminates elements associated to terrigenous input from those subject to biogenic control. Further separation in sub-cluster was interpreted in term of different element response to changes in provenance but also to depositional/early diagenetic conditions at the seafloor. Whilst K and Ti are related to different sediment sources confirming previous studies from the same interval, V, Zn and, to a lesser extent, Fe, document reducing/anoxic conditions during the diatomites deposition (in particular in 400-460mbsf interval). Mg, Sr and Mn contents are related to authigenic carbonate precipitation whilst Ba is interested by nonsteady-state processes leading to local peaks of barium below the sulphate-rich/sulphate-poor pore water boundary where generally the low degree of barite saturation is responsible for Ba remobilization. Such alteration in depositional dynamics, responsible of the precipitation of an oxygen-depleted barium phase, was probably induced by change in sedimentation rate and/or in palaeoenvironmental conditions. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84873901624&doi=10.1016%2fj.gloplacha.2013.01.001&partnerID=40&md5=89a6b526f8094cf5cfe6bd2e6727a146
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11223
Appears in Collections: 全球变化的国际研究计划
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作者单位: Dipartimento di Scienze della Terra e del Mare (DiSTeM), Università di Palermo, Via Archirafi 36, 90123 Palermo, Italy
Recommended Citation:
Scopelliti G.,Bellanca A.,Monien D.,et al. Chemostratigraphy of the early Pliocene diatomite interval from MIS AND-1B core (Antarctica): Palaeoenvironment implications[J]. Global and Planetary Change,2013-01-01,102.