globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.07.047
论文题名:
The dolomite nodules enclosing fossil marine vertebrates in the East Pisco Basin, Peru: Field and petrographic insights into the Lagerstätte formation
作者: Gariboldi K.; Gioncada A.; Bosio G.; Malinverno E.; Di Celma C.; Tinelli C.; Cantalamessa G.; Landini W.; Urbina M.; Bianucci G.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 438
起始页码: 81
结束页码: 95
语种: 英语
英文关键词: Biomineralization ; Dolomite concretions ; Marine vertebrates ; Pisco Formation ; Taphonomy
英文摘要: The Mio-Pliocene Pisco Formation (Peru) is a world-famous marine vertebrate Lagerstätte. Several fossil specimens are wrapped up in dolomitic nodules. Some others lie in the sediment displaying dolomite only in bone cavities (e.g., mesorostral canal and endocranium). With the aim to understand whether the precipitation of the dolomitic nodules influenced the formation of the Lagerstätte, we collected field data on a high number of fossil vertebrates and conducted petrographic and mineralogical analyses on samples representative of the variable development of concretions. Our results revealed positive relationships between size, completeness and articulation of skeletons and the presence of an external nodule. Clear evidence of chemoautotrophic communities that thrived on the carcasses is scarce. Microborings are often found in the cortical bone tissues together with iron oxides; the former are left by microorganisms feeding on the carcass, the latter are traces of former Fe sulphides, a product of organic matter degradation. We suggest that an early burial of the skeletons was a determinant factor in the development of dolomite concretions, since it allowed methanogenesis and anaerobic sulphate reduction exploiting the lipids in the bones and the organic matter dispersed in the sediments. Dolomite precipitation was driven by the same bacteria operating during the suphophilic stage of whale-fall communities. Textural observations imply that dolomite precipitated shortly after the burial of carcasses. The increase of alkalinity generated by sulphate reduction and methanogenesis caused a rapid precipitation of the dolomite within skeletal cavities and prevented the degradation of the bones and diagenetic compression of skeletons; the nodules themselves prevented erosion of fossils after exhumation. Therefore, nodule formation had a crucial role in the development of the Pisco Lagerstätte. © 2015.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68815
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: Dipartimento di Scienze della Terra, Università di Pisa, via Santa Maria 53, Pisa, Italy; Dottorato Regionale Toscano di Scienze della Terra, Dipartimento di Scienze della Terra, Università di Pisa, via Santa Maria 53, Pisa, Italy; Dipartimento di Scienze dell'Ambiente e del Territorio e di Scienze della Terra (DISAT), Sezione di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Piazza della Scienza 4, Milano, Italy; Scuola di Scienze e Tecnologie, Università di Camerino, Via Gentile III da Varano 1, Camerino, Macerata, Italy; Departamento de Paleontologia de Vertebrados, Museo de Historia Natural-UNMSM, Avenida Arenales 1256, Jesús María, Lima 14, Peru

Recommended Citation:
Gariboldi K.,Gioncada A.,Bosio G.,et al. The dolomite nodules enclosing fossil marine vertebrates in the East Pisco Basin, Peru: Field and petrographic insights into the Lagerstätte formation[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,438
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Gariboldi K.]'s Articles
[Gioncada A.]'s Articles
[Bosio G.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Gariboldi K.]'s Articles
[Gioncada A.]'s Articles
[Bosio G.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Gariboldi K.]‘s Articles
[Gioncada A.]‘s Articles
[Bosio G.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.