气候变化领域集成服务门户(CCPortal): Phosphatized early Cambrian archaeocyaths and small shelly fossils (SSFs) of southwestern Mongolia

CCPortal

DOI	10.1016/j.palaeo.2017.07.002
	Phosphatized early Cambrian archaeocyaths and small shelly fossils (SSFs) of southwestern Mongolia
	Pruss S.B.; Dwyer C.H.; Smith E.F.; Macdonald F.A.; Tosca N.J.
发表日期	2019
ISSN	0031-0182
起始页码	166
结束页码	177
卷号	513
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.
英文关键词	Phosphatization; Salaagol; Taphonomy; Terreneuvian; Tommotian
语种	英语
scopus关键词	apatite; archaeology; Cambrian; fossil; fossil assemblage; organic matter; phosphatization; redox conditions; reef; sponge; taphonomy; Mongolia; Archaeocyatha
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151213
作者单位	Smith College, Department of Geosciences, Northampton, MA 01063, United States; Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, United States; Department of Paleobiology, Smithsonian Institution, Washington, DC 20013-7012, United States; Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02139, United States; Department of Earth Sciences, Oxford University, Oxford, OX1 3AN, United Kingdom
推荐引用方式 GB/T 7714	Pruss S.B.,Dwyer C.H.,Smith E.F.,et al. Phosphatized early Cambrian archaeocyaths and small shelly fossils (SSFs) of southwestern Mongolia[J],2019,513.
APA	Pruss S.B.,Dwyer C.H.,Smith E.F.,Macdonald F.A.,&Tosca N.J..(2019).Phosphatized early Cambrian archaeocyaths and small shelly fossils (SSFs) of southwestern Mongolia.Palaeogeography, Palaeoclimatology, Palaeoecology,513.
MLA	Pruss S.B.,et al."Phosphatized early Cambrian archaeocyaths and small shelly fossils (SSFs) of southwestern Mongolia".Palaeogeography, Palaeoclimatology, Palaeoecology 513(2019).