globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.07.002
论文题名:
Phosphatized early Cambrian archaeocyaths and small shelly fossils (SSFs) of southwestern Mongolia
作者: Pruss S.B.; Dwyer C.H.; Smith E.F.; Macdonald F.A.; Tosca N.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: Phosphatization ; Salaagol ; Taphonomy ; Terreneuvian ; Tommotian
英文摘要: Archaeocyaths are an enigmatic group of calcifying sponges prevalent in early Cambrian (Terreneuvian to Series 2) successions around the world and preserved predominantly in reefal buildups, but also in adjacent reworked deposits. Here we report exceptionally preserved phosphatized archaeocyaths and small shelly fossils from phosphatized reef flank deposits at the top of the Salaagol Formation of southwestern Mongolia. Recent chemostratigraphic age models suggest that these archaeocyaths are among the earliest reported in the Terreneuvian Stage 2 (Tommotian). These fossils provide a window into the mechanisms of archaeocyath phosphatization, a generally rare mode of archaeocyath preservation. To assess the composition and nature of phosphatization, fossil assemblages were examined in insoluble residue and thin section. These archaeocyaths are preserved as phosphatic internal molds in residue, and both phosphatized and unphosphatized archaeocyaths are present in thin section. The occurrence of internal molds and complementary mineralogical data suggest that the decay of organic material within the archaeocyaths created the necessary redox conditions for apatite nucleation. We propose that, shortly after death, this assemblage was transported to a deeper water environment, and that the presence of organic matter in a low oxygen setting led to abundant phosphatization of archaeocyaths. © 2017 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/68065
Appears in Collections:过去全球变化的重建

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作者单位: Smith College, Department of Geosciences, Northampton, MA 01063, USA; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA; Department of Paleobiology, Smithsonian Institution, Washington, DC 20013-7012, USA; Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA,02139, USA; Department of Earth Sciences, Oxford University, Oxford OX1 3AN, UK

Recommended Citation:
Pruss S.B.,Dwyer C.H.,Smith E.F.,et al. Phosphatized early Cambrian archaeocyaths and small shelly fossils (SSFs) of southwestern Mongolia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01
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