气候变化领域集成服务门户(CCPortal): Time-richness and phosphatic microsteinkern accumulation in the Cincinnatian (Katian) Ordovician; USA: An example of polycyclic phosphogenic condensation

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DOI	10.1016/j.palaeo.2019.109362
	Time-richness and phosphatic microsteinkern accumulation in the Cincinnatian (Katian) Ordovician; USA: An example of polycyclic phosphogenic condensation
	Dattilo B.F.; Freeman R.L.; Zubovic Y.M.; Brett C.E.; Straw A.M.; Frauhiger M.J.; Hartstein A.R.; Shoemaker L.M.
发表日期	2019
ISSN	0031-0182
卷号	535
英文摘要	Millimeter-scale phosphatic steinkern preservation is a feature of the taxonomically enigmatic Early Cambrian “small shelly faunas”, but this style of preservation is not unique to the Cambrian; it is ubiquitous, if infrequently reported, from the Phanerozoic record. The polycyclic phosphogenic condensation (PPC) model envisions both the genesis and concentration of phosphatic microsteinkerns as natural outcomes of shell bed genesis through episodic sediment starvation. This model predicts that more reworked and condensed shell bed limestones will contain more phosphatic microsteinkerns, but that even the least reworked limestones may contain some phosphatic particles. We test this model through examination of vertical thin sections densely collected through a 10-meter interval from the classic Cincinnatian (upper Katian, middle Maysvillian North American Stage) upper Fairview Formation, Miamitown Shale, and lower Grant Lake formations at four localities near Cincinnati, Ohio. For each of approximately 50 distinguishable limestone depositional units in each locality, a 2 × 2 cm square was selected for study. Each square was assigned a textural classification (mud content of intergranular space) and a breakage rank (pristine to comminuted). Phosphatic particle distribution was quantified both by visual estimation and by particle counting, with counts ranging from none detected to over 1000 per 4 cm2. Our analyses show a strong positive relationship between phosphate content and both textural maturity and fragmentation. This positive relationship is consistent with the PPC model and confirms that textural maturity can reflect the degree of condensation as well as depth-related environmental energy. This finding suggests that shell bed processes of repeated deposition and reworking make a significant contribution to the generation and accumulation of phosphatic particles. If local-scale sedimentary processes and conditions can control this accumulation, temporal changes in phosphatic sediment deposition rates may be linked to earth changes more complexly than through changing ocean chemistry on a global scale. © 2019 Elsevier B.V.
英文关键词	Phosphate; Sediment starvation; Shell beds; Small shelly fossils; Steinkerns
语种	英语
scopus关键词	Cambrian; condensation; fossil record; limestone; Phanerozoic; phosphate; reworking; sedimentation; shell bed; Cincinnati; Ohio; United States; Cincinnatia
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/150768
作者单位	Department of Biology, Indiana University-Purdue University Ft. Wayne, Ft. Wayne, IN 46805, United States; Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506, United States; Department of Mathematical Sciences, Purdue University Fort Wayne, Fort Wayne, IN 46805, United States; Department of Geology, University of Cincinnati, Cincinnati, OH 45221, United States; Earth, Atmospheric and Planetary Science Program, Department of Physics, Purdue University Fort Wayne, Fort Wayne, IN 46805, United States; Department of Geological Sciences, Ball State University, Muncie, IN 47306, United States
推荐引用方式 GB/T 7714	Dattilo B.F.,Freeman R.L.,Zubovic Y.M.,et al. Time-richness and phosphatic microsteinkern accumulation in the Cincinnatian (Katian) Ordovician; USA: An example of polycyclic phosphogenic condensation[J],2019,535.
APA	Dattilo B.F..,Freeman R.L..,Zubovic Y.M..,Brett C.E..,Straw A.M..,...&Shoemaker L.M..(2019).Time-richness and phosphatic microsteinkern accumulation in the Cincinnatian (Katian) Ordovician; USA: An example of polycyclic phosphogenic condensation.Palaeogeography, Palaeoclimatology, Palaeoecology,535.
MLA	Dattilo B.F.,et al."Time-richness and phosphatic microsteinkern accumulation in the Cincinnatian (Katian) Ordovician; USA: An example of polycyclic phosphogenic condensation".Palaeogeography, Palaeoclimatology, Palaeoecology 535(2019).