气候变化领域集成服务门户(CCPortal): Global and local drivers of the Ediacaran Shuram carbon isotope excursion

CCPortal

DOI	10.1016/j.epsl.2022.117368
	Global and local drivers of the Ediacaran Shuram carbon isotope excursion
	Busch, James F.; Hodgin, Eben B.; Ahm, Anne-Sofie C.; Husson, Jon M.; Macdonald, Francis A.; Bergmann, Kristin D.; Higgins, John A.; Strauss, Justin V.
发表日期	2022
ISSN	0012-821X
EISSN	1385-013X
卷号	579
英文摘要	The Ediacaran Shuram carbon isotope excursion (CIE) follows the regional Gaskiers glaciation and occurs before the appearance of macroscopic animal fossils. Previous interpretations for the Shuram CIE have proposed global perturbations to Earth's carbon cycle accompanied by significant climatic and environmental change. These studies assume that carbonate carbon isotopes through the Shuram CIE record the composition of dissolved inorganic carbon in seawater. Through a compilation of new geochemical, sedimentological, and stratigraphic data from five localities on four separate paleocontinents, we find that all of the analyzed Shuram CIE successions share general similarities including a common transgressive-regressive sequence that is coincident with similar shifts in a host of geochemical proxies (delta C-13, delta O-18, delta(44)/Ca-40, Sr/Ca, Mn/Sr, U/Ca). Despite these broad similarities between sections, there are important differences in the proxies between water depths that may be linked to changes in carbonate diagenesis. Specifically, we find the excursion's magnitude is largest in slope environments where diagenesis is sediment-buffered and smaller in shallow-water settings dominated by fluid-buffered diagenesis. The transgression that accompanied the Shuram CIE is consistent in amplitude (similar to 10-100s m) and duration (> 1 My) with eustatic fluctuations driven by plate reorganization. These coupled geochemical and stratigraphic observations argue against meteoric and burial diagenesis as drivers for the excursion; instead, they are best explained by global changes to the locus and intensity of photosynthetic primary productivity in shallow-water environments and do not necessarily require large changes in global climate or marine redox.(C) 2022 Elsevier B.V. All rights reserved.
英文关键词	Shuram excursion; Ediacaran; diagenesis; carbonate geochemistry
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000781933800008
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/280750
作者单位	Dartmouth College; University of California System; University of California Berkeley; Princeton University; University of Victoria; University of California System; University of California Santa Barbara; Massachusetts Institute of Technology (MIT)
推荐引用方式 GB/T 7714	Busch, James F.,Hodgin, Eben B.,Ahm, Anne-Sofie C.,et al. Global and local drivers of the Ediacaran Shuram carbon isotope excursion[J],2022,579.
APA	Busch, James F..,Hodgin, Eben B..,Ahm, Anne-Sofie C..,Husson, Jon M..,Macdonald, Francis A..,...&Strauss, Justin V..(2022).Global and local drivers of the Ediacaran Shuram carbon isotope excursion.EARTH AND PLANETARY SCIENCE LETTERS,579.
MLA	Busch, James F.,et al."Global and local drivers of the Ediacaran Shuram carbon isotope excursion".EARTH AND PLANETARY SCIENCE LETTERS 579(2022).