globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.05.007
论文题名:
Carbonate-to-biosilica transition at the Norian-Rhaetian boundary controlled by rift-related subsidence in the western Tethyan Lagonegro Basin (southern Italy)
作者: Casacci M.; Bertinelli A.; Algeo T.J.; Rigo M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 456
起始页码: 21
结束页码: 36
语种: 英语
英文关键词: Chemical index of alteration ; Elemental geochemistry ; Rare earth elements ; Redox conditions ; UPPER Triassic
英文摘要: The Lagonegro Basin, located in the Southern Apennines, Italy, records a transition from carbonate sediments of the Calcari con Selce Fm. ("Cherty Limestone") to biosiliceous sediments of the Scisti Silicei Fm. ("Siliceous Shale") around the Norian-Rhaetian boundary (NRB), Upper Triassic. Sedimentologic and chemostratigraphic analysis of three sections (Pignola-Abriola, Monte Volturino, and Madonna del Sirino) representing a proximal-to-distal transect across the basin document marine productivity, redox, and chemical weathering conditions. The basin was characterized by low to moderate productivity and mainly oxic deep waters, with no systematic secular variation throughout the ~ 10-Myr-long study interval. A weathering proxy, the chemical index of alteration (CIA*), shifts toward higher values (from ~0.70 to ~0.80) in all three study sections, suggesting development of warmer and/or more humid conditions just before the NRB. The lack of evidence for changes in marine productivity or redox conditions and the time-transgressive nature of the carbonate-biosilica transition suggests that the latter was caused not by changes in planktonic communities but, rather, by a rise in the CCD, the most likely cause of which was seafloor subsidence within the actively rifting Ionian Ocean (i.e., the westernmost branch of the Tethys Ocean). The tectonically active character of the Lagonegro Basin is also reflected in evidence of synsedimentary paleoseismic activity, e.g., numerous debris flows around the basin margins. The present study thus documents sedimentologic changes within a marginal basin in a geologically young ocean. © 2016 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/68375
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作者单位: Department of Physics and Geology, University of Perugia, Perugia, Italy; Department of Geology, University of Cincinnati, Cincinnati, OH, United States; State Key Laboratories of GPMR and BGEG, China University of Geosciences, Wuhan, China; Department of Geosciences, University of Padua, Padua, Italy; IGG-CNR, Via G. Gradenigo 6, Padua, Italy

Recommended Citation:
Casacci M.,Bertinelli A.,Algeo T.J.,et al. Carbonate-to-biosilica transition at the Norian-Rhaetian boundary controlled by rift-related subsidence in the western Tethyan Lagonegro Basin (southern Italy)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,456
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