Locating the BACE of the Cambrian: Bayan Gol in southwestern Mongolia and global correlation of the Ediacaran-Cambrian boundary

doi:10.1016/j.earscirev.2022.104017

	Locating the BACE of the Cambrian: Bayan Gol in southwestern Mongolia and global correlation of the Ediacaran-Cambrian boundary
	Topper, Timothy 7,8; Betts, Marissa J.6,8; Dorjnamjaa, Dorj 5; Li, Guoxiang 4; Li, Luoyang 2,3,7; Altanshagai, Gundsambuu 1,5; Enkhbaatar, Batkhuyag 1,5; Skovsted, Christian B.7,8
刊名	EARTH-SCIENCE REVIEWS
	2022-06-01
卷号	229 页码:34
关键词	Cambrian Ediacaran GSSP ASSP Protohertzina Treptichnus Chemostratigraphy Chronostratigraphy BACE
ISSN号	0012-8252
DOI	10.1016/j.earscirev.2022.104017
通讯作者	Topper, Timothy(timothy.topper@nwu.edu.cn) ; Betts, Marissa J.(marissa.betts@une.edu.au) ; Skovsted, Christian B.(christian.skovsted@nrm.se)
英文摘要	The diversification of animals during the Cambrian Period is one of the most significant evolutionary events in Earth's history. However, the sequence of events leading to the origin of 'modern' ecosystems and the exact temporal relationship between Ediacaran and Cambrian faunas are uncertain, as identification of the Ediacaran-Cambrian boundary and global correlation through this interval remains problematic. Here we review the controversies surrounding global correlation of the base of the Cambrian and present new high-resolution biostratigraphic, lithostratigraphic and 813C chemostratigraphic data for terminal Ediacaran to basal Cambrian strata in the Zavkhan Basin of Mongolia. This predominantly carbonate sequence, through the Zuun-Arts and Bayangol formations in southwestern Mongolia, captures a distinct, negative delta C-13 excursion close to the top of the Zuun-Arts Formation recognized as the BAsal Cambrian carbon isotope Excursion (BACE). In this location, the nadir of the BACE closely coincides with first occurrence of the characteristic early Cambrian protoconodont Protohertzina anabarica. Despite recent suggestions that there is an evolutionary continuum of biomineralizing animals across the Ediacaran-Cambrian transition, we suggest that this continuum is restricted to tubular forms, and that skeletal taxa such as Protohertzina depict 'true' Cambrian representatives that are restricted entirely to the Cambrian. Employing the first appearance of the trace fossil Treptichnus pedum to define the base of the Cambrian suffers significant drawbacks, particularly in carbonate settings where it is not commonly preserved. As T. pedum is the only proxy available to correlate the Cambrian Global boundary Stratotype Section and Point (GSSP) defined at Fortune Head, Newfoundland, we suggest that the GSSP be redefined elsewhere, in a new stratigraphic section that contains secondary markers that permit global correlation. We propose the nadir of the BACE as the favored candidate to define the base of the Cambrian. However, it is essential that the BACE be complemented with secondary markers. In many global sections the nadir of the BACE and the first occurrence of the genus Protohertzina are closely juxtaposed, as are the BACE and T. pedum. Hence these taxa provide essential biostratigraphic control on the BACE and increase potential for effective global correlation. We also recommend that an Auxiliary boundary Stratotype Section and Point (ASSP) be simultaneously established in order to incorporate additional markers that will aid global correlation of the Ediacaran-Cambrian boundary. The BAY4/ 5 section through the upper Zuun-Arts and Bayangol formations yields key shelly fossils and delta C-13 values and is therefore an ideal candidate for consideration as the GSSP for the Ediacaran-Cambrian boundary.
资助项目	Swedish Research Council[VR2017-05183] ; Swedish Research Council[VR2016-04610] ; Swedish Research Council[VR2021-04295] ; Young Thousand Talents Plan of China[41720104002] ; National Natural Science Foundation of China[42072003] ; National Natural Science Foundation of China[41890844] ; Northwest University, Xi'an ; University of New England, Australia ; So?ren Jensen (University of Extremdura)
WOS关键词	PALEONTOLOGICAL LATE EDIACARAN ; CARBON-ISOTOPE STRATIGRAPHY ; SKELETAL FOSSIL ASSEMBLAGES ; EARLY MARINE DIAGENESIS ; SMALL SHELLY FOSSILS ; SOUTH CHINA ; STRATOTYPE SECTION ; CHRONOSTRATIGRAPHIC CORRELATION ; INTEGRATED CHEMOSTRATIGRAPHY ; DEPOSITIONAL-ENVIRONMENTS
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000804688800001
资助机构	Swedish Research Council ; Young Thousand Talents Plan of China ; National Natural Science Foundation of China ; Northwest University, Xi'an ; University of New England, Australia ; So?ren Jensen (University of Extremdura)
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/40850]
专题	中国科学院南京地质古生物研究所
通讯作者	Topper, Timothy; Betts, Marissa J.; Skovsted, Christian B.
作者单位	1.Natl Univ Mongolia, Sch Arts & Sci, Ulaanbaatar 14200, Mongolia 2.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China 3.Ocean Univ China, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Qingdao 266100, Peoples R China 4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 5.Mongolian Acad Sci, Inst Paleontol, Ulaanbaatar 15160, Mongolia 6.Univ New England, Palaeoscience Res Ctr, Sch Environm & Rural Sci, Armidale, NSW 2351, Australia 7.Swedish Museum Nat Hist, Dept Palaeobiol, Box 50007, SE-10405 Stockholm, Sweden 8.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Shaanxi Key Lab Early Life & Environm, Xian 710069, Peoples R China
推荐引用方式 GB/T 7714	Topper, Timothy,Betts, Marissa J.,Dorjnamjaa, Dorj,et al. Locating the BACE of the Cambrian: Bayan Gol in southwestern Mongolia and global correlation of the Ediacaran-Cambrian boundary[J]. EARTH-SCIENCE REVIEWS,2022,229:34.
APA	Topper, Timothy.,Betts, Marissa J..,Dorjnamjaa, Dorj.,Li, Guoxiang.,Li, Luoyang.,...&Skovsted, Christian B..(2022).Locating the BACE of the Cambrian: Bayan Gol in southwestern Mongolia and global correlation of the Ediacaran-Cambrian boundary.EARTH-SCIENCE REVIEWS,229,34.
MLA	Topper, Timothy,et al."Locating the BACE of the Cambrian: Bayan Gol in southwestern Mongolia and global correlation of the Ediacaran-Cambrian boundary".EARTH-SCIENCE REVIEWS 229(2022):34.