DOI: 10.1016/j.palaeo.2016.08.021
论文题名: Rare earth elements of shallow-water articulated brachiopods: A bathymetric sensor
作者: Zaky A.H. ; Brand U. ; Azmy K. ; Logan A. ; Hooper R.G. ; Svavarsson J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 461 起始页码: 178
结束页码: 194
语种: 英语
英文关键词: Articulated brachiopods
; Bathymetric sensor
; Ce anomaly
; Environmental impacts
; REEs
; Shallow water masses
英文摘要: Variations in environmental physicochemical parameters result in corresponding changes in seawater rare earth element (REE) distributions. For an archive to be utilized in paleoceanographic and paleoenvironmental reconstructions, it should record these variations. Therefore, an archive's proxy potentiality should be assessed analogous to modern oceanic settings. Articulated brachiopods of several shallow water localities (< 500 m) of different water masses were evaluated for their REE contents. The affects of oceanographic factors such as depth, salinity, and temperature were investigated for REE uptake by the shells. Uptake of REE by dorsal and ventral valves of articulated shells are unequivocal, whereas shells of Thecideidines, the umbo region and primary layer of the Terebratulids are anomalous, and should be avoided. Water temperature and salinity appear to have minor to moderate impacts on the partition coefficients of REEs between seawater and brachiopod calcite. The mean REESN pattern of shallow-water brachiopods is significantly different from that of their deep-water counterparts, with lower enrichments in LREEs and MREEs, and depletion in HREEs. Depth exercises a major control on the LREE and MREE fractionation with a milder one on HREE fractionation. The Ce/Ce* anomaly is not affected by either of these parameters in shallow-water settings, but in deep settings the depth effect dominates. Due to the importance of depth on REE fractionation in the shells from shallow settings, their LREESN to HREESN ratios (L:H) were divided into six discrete intervals for the bathymetric sensor. The bathymetric sensor was applied to some fossils and whole rock in order to estimate their paleodepths. The evaluation was successful in placing the Permian Gyanyima, the Pennsylvanian Naco, Boggy and the Silurian Chicotte, Becscie and Jupiter Formations in shallow depths (< 15–50 m), which is consistent with their paleoenvironmental settings. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68246
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland, Canada; Department of Earth Sciences, Brock University, St. Catharines, Ontario, Canada; Centre for Coastal Studies, University of New Brunswick, Saint John, New Brunswick, Canada; Department of Biology, Memorial University of Newfoundland, St. John's, NL, Canada; Institute of Biology, University of Iceland, Askja, Sturlugata 7, Reykjavík, Iceland
Recommended Citation:
Zaky A.H.,Brand U.,Azmy K.,et al. Rare earth elements of shallow-water articulated brachiopods: A bathymetric sensor[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,461