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| Phosphogenesis in the Bonarelli Level from northwestern Sicily, Italy: petrographic evidence of microbial mediation and related REE behaviour | |
| Scopelliti, G. | |
| 2010 | |
| Source Publication | Cretaceous Research
 |
| ISSN | 0195-6671 |
| Volume | 31Issue:2Pages:237-248 |
| Abstract | Phosphogenesis at the base of the Bonarelli Level from the Calabianca stratigraphic section (northwestern Sicily) was investigated using X-ray diffraction, scanning electron microscopy, X-ray fluorescence, and stable-isotope mass spectrometry. The anoxic event onset is marked by high P(2)O(5tot) concentrations related to the presence of authigenic carbonate-fluorapatite. This mineral is poorly crystallized and occurs in three different forms: (i) fish debris locally showing evidence of re-crystallization, (ii) phosphatically cemented layers, and (iii) dense aggregates of microcrystals. Petrographic features are indicative of a microbial genesis for the carbonate-fluorapatite. Conversely, this evidence is lacking in phosphate from the upper part of the section, where lower P(2)O(5tot) concentrations are linked to the presence of sparse unaltered hydroxy-apatite fish debris. Distribution patterns of rare earth elements (REE) throughout the Calabianca section, the Ce anomaly and V/(V Ni) values suggest fluctuating redox conditions during phosphogenesis. These conditions triggered the iron redox cycle that operated as phosphate sink-switching mechanism. Depth profiles of P mass accumulation rate and C-isotope compositions highlight the decoupling of P and C-org cycles, whose global implication is confirmed by correlation with the same proxies from other well known stratigraphic sections, which embody sedimentary expressions of the Oceanic Anoxic Event 2 (OAE2). (C) 2009 Elsevier Ltd. All rights reserved. |
| Document Type | 期刊论文 |
| Identifier | https://ir.xtbg.ac.cn/handle/353005/8484 |
| Collection | 公共技术服务中心主要仪器相关文献_同位素质谱仪 |
| Recommended Citation GB/T 7714 | Scopelliti, G.. Phosphogenesis in the Bonarelli Level from northwestern Sicily, Italy: petrographic evidence of microbial mediation and related REE behaviour[J]. Cretaceous Research,2010,31(2):237-248. |
| APA | Scopelliti, G..(2010).Phosphogenesis in the Bonarelli Level from northwestern Sicily, Italy: petrographic evidence of microbial mediation and related REE behaviour.Cretaceous Research,31(2),237-248. |
| MLA | Scopelliti, G.."Phosphogenesis in the Bonarelli Level from northwestern Sicily, Italy: petrographic evidence of microbial mediation and related REE behaviour".Cretaceous Research 31.2(2010):237-248. |
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