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Calcitic shells in the aragonite sea of the earliest Cambrian
Li, Luoyang1,2,3; Topper, Timothy P.4,5,6; Betts, Marissa J.4,5,7; Dorjnamjaa, Dorj8; Altanshagai, Gundsambuu8,9; Enkhbaatar, Baktuyag8,9; Li, Guoxiang(李国祥)10; Skovsted, Christian B.4,5,6
2022-11-02
Source PublicationGEOLOGY
ISSN0091-7613
Pages5
Abstract

The initial acquisition of calcium carbonate polymorphs (aragonite and calcite) at the onset of skeletal biomineralization by disparate metazoans across the Ediacaran-Cambrian transition is thought to be directly influenced by Earth's seawater chemistry. It has been presumed that animal clades that first acquired mineralized skeletons during the so-called "aragonite sea" of the latest Ediacaran and earliest Cambrian (Terreneuvian) possessed aragonite or high-Mg calcite skeletons, while clades that arose in the subsequent "calcite sea" of Cambrian Series 2 acquired low-Mg calcite skeletons. Here, contrary to previous expectations, we document shells of one of the earliest helcionelloid molluscs from the basal Cambrian of southwestern Mongolia that are composed entirely of low-Mg calcite and formed during the Terreneuvian aragonite sea. The extraordinarily well-preserved Postacanthella shells have a simple prismatic microstructure identical to that of their modern low-Mg cal-cite molluscan relatives. High-resolution scanning electron microscope observations show that calcitic crystallites were originally encased within an intra-and interprismatic organic matrix scaffold preserved by aggregates of apatite during early diagenesis. This indicates that not all molluscan taxa during the early Cambrian produced aragonitic shells, weaken-ing the direct link between carbonate skeletal mineralogy and ambient seawater chemistry during the early evolution of the phylum. Rather, our study suggests that skeletal mineralogy in Postacanthella was biologically controlled, possibly exerted by the associated prismatic organic matrix. The presence of calcite or aragonite mineralogy in different early Cambrian molluscan taxa indicates that the construction of calcium carbonate polymorphs at the time when skeletons first emerged may have been species dependent.

DOI10.1130/G50533.1
Indexed BySCI
Language英语
WOS KeywordSEAWATER CHEMISTRY ; BIOMINERALIZATION
Funding ProjectNational Natural Science Foundation of China ; State Administra-tion of Foreign Experts Affair China Postdoctoral Science Foundation ; Swedish Research Council ; Young Thousand Tal-ents Plan of China program ; [41930319] ; [42121005] ; [41890844] ; [42072003] ; [2022M712987] ; [VR2016-04610] ; [VR2017-05183] ; [41720104002]
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000882195200001
Funding OrganizationNational Natural Science Foundation of China ; State Administra-tion of Foreign Experts Affair China Postdoctoral Science Foundation ; Swedish Research Council ; Young Thousand Tal-ents Plan of China program
PublisherGEOLOGICAL SOC AMER, INC
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/41436
Collection中国科学院南京地质古生物研究所
Corresponding AuthorLi, Luoyang
Affiliation1.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Qingdao 266100, Peoples R China
2.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China
3.Natl Lab Marine Sci & Technol Qingdao, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
4.Northwest Univ, Shaanxi Key Lab Early Life & Environm, State Key Lab Continental Dynam, Xian 710069, Peoples R China
5.Northwest Univ, Dept Geol, Xian 710069, Peoples R China
6.Swedish Museum Nat Hist, Dept Palaeobiol, Box 50007, SE-10405 Stockholm, Sweden
7.Univ New England, Sch Environm & Rural Sci, Palaeosci Res Ctr, Armidale, NSW 2351, Australia
8.Mongolian Acad Sci, Inst Paleontol, Ulaanbaatar 15160, Mongolia
9.Natl Univ Mongolia, Sch Arts & Sci, Ulaanbaatar 14200, Mongolia
10.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Li, Luoyang,Topper, Timothy P.,Betts, Marissa J.,et al. Calcitic shells in the aragonite sea of the earliest Cambrian[J]. GEOLOGY,2022:5.
APA Li, Luoyang.,Topper, Timothy P..,Betts, Marissa J..,Dorjnamjaa, Dorj.,Altanshagai, Gundsambuu.,...&Skovsted, Christian B..(2022).Calcitic shells in the aragonite sea of the earliest Cambrian.GEOLOGY,5.
MLA Li, Luoyang,et al."Calcitic shells in the aragonite sea of the earliest Cambrian".GEOLOGY (2022):5.
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