气候变化领域集成服务门户(CCPortal): A meta-analysis of the Steptoean Positive Carbon Isotope Excursion: The SPICEraq database

CCPortal

DOI	10.1016/j.earscirev.2020.103442
	A meta-analysis of the Steptoean Positive Carbon Isotope Excursion: The SPICEraq database
	Pulsipher M.A.; Schiffbauer J.D.; Jeffrey M.J.; Huntley J.W.; Fike D.A.; Shelton K.L.
发表日期	2021
ISSN	00128252
卷号	212
英文摘要	The Steptoean Positive Isotopic Carbon Excursion (SPICE) is a prominent chemostratigraphic feature in the Lower Paleozoic. It has been used to correlate Upper Cambrian carbonate strata globally, and is cited as intimately linked to the Crepicephalus-Aphelaspis trilobite extinction event and the Sauk II-Sauk III megasequence transition. Despite the global nature of the SPICE event, regional/local conditions serve as a control on the expression of the SPICE event in the rock record. In light of this, and to better understand how reliable the SPICE event is as a chemostratigraphic tool for correlation, we have created the “SPICEraq,” a database comprising 78 SPICE-bearing sections containing 6669 individual δ13C analyses. In this study, we quantitatively evaluate the variability in SPICE records, and document that, while the excursion is a global signature, its stratigraphic expression is influenced by such conditions as paleolatitude, paleocontinent, water depth, and facies. While the magnitude of the SPICE excursion is generally consistent (an ~4‰ increase), the peak δ13C values are quite variable (ranging from +0.35 to +5.87‰). Specifically, sections located between 30 and 60°S paleolatitude ca. 500 Ma record δ13C values ~1 to 2‰ lower than those from lower paleolatitudes. Sections deposited in shallow water depths and facies also record lower δ13C values than intermediate and deep-water facies; the deep-water facies exhibit the most 13C-enriched carbonates at the peak of the SPICE and post-excursion. The stratigraphic thickness of the excursion varies widely, ranging from <3 to ~884 m, and is significantly impacted by all categorical variables investigated in this study. This study documents that the rising limb of the SPICE is immediately preceded by a small negative δ13C excursion in 75% of sections with data collected pre-SPICE. While 32% of sections record a δ13C plateau during peak SPICE, its presence in the δ13C record does not appear to be influenced by any environmental conditions investigated herein. Altogether, these analyses indicate that regional/local conditions impact the stratigraphic expression of δ13C records, and thus care should be taken to use robust, quantitative measures to compare and correlate excursions. © 2020 Elsevier B.V.
关键词	Cambrian Period Chemostratigraphy Furongian Series Isotope geochemistry Paibian Stage Steptoean Positive Carbon Isotope Excursion
英文关键词	Cambrian; carbon isotope; chemostratigraphy; data set; geochemistry; meta-analysis; sequence stratigraphy; Crepicephalus
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/204119
作者单位	Department of Geological Sciences, University of Missouri, Columbia, MO 65211, United States; X-ray Microanalysis Core Facility, University of Missouri, Columbia, MO 65211, United States; Department of Environmental Studies, Bellarmine University, Louisville, KY 40205, United States; Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, MO 63130, United States
推荐引用方式 GB/T 7714	Pulsipher M.A.,Schiffbauer J.D.,Jeffrey M.J.,et al. A meta-analysis of the Steptoean Positive Carbon Isotope Excursion: The SPICEraq database[J],2021,212.
APA	Pulsipher M.A.,Schiffbauer J.D.,Jeffrey M.J.,Huntley J.W.,Fike D.A.,&Shelton K.L..(2021).A meta-analysis of the Steptoean Positive Carbon Isotope Excursion: The SPICEraq database.Earth Science Reviews,212.
MLA	Pulsipher M.A.,et al."A meta-analysis of the Steptoean Positive Carbon Isotope Excursion: The SPICEraq database".Earth Science Reviews 212(2021).