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![Bio- and C-isotope stratigraphic correlation scheme between sections on the Yangtze platform. The light yellow color with a ‘?' marks the poorly fossiliferous interzone which indicates an undetermined zonation. BYS, Baiyanshao Member; DB, Daibu Member; ZYC, Zhongyicun Member; DH, Dahai Member; SYT, Shiyantou Formation; XWTS, Xiaowaitoushan Member.]()
![A: Covariations of highly reactive iron concentrations (FeHR) and δ97/95Mo values for samples from Meishucun section. B: Hypothetical mixing model between Mo associated with Fe-oxyhydroxides (estimated with FeHR concentration) and Mo within phosphorite and/or dolomite matrix. BYS—Baiyanshao Member; XWTS—Xiaowaitoushan Member; ZYC lower—lower Zhongyicun Member; ZYC upper—upper Zhongyicun Member; DH—Dahai Member.]()
![Figure1—Geographic location, stratigraphic column, fossil occurrence, and Δ13C profile of the Xiaotan section. δ13C data from Zhou et al. (1997). Note the positive δ13C excursion in the Dahai Member. The four SSF assemblages are I: Anabarites trisulcatus–Protohertzina anabrica; II: Siphogonuchites triangularis–Paragloborilus subglobosus; III: “Heraultipegma yunnanensis”; IV: Sinosachites flabelliformis–Tannuolina zhangwentangi]()
![Stratigraphic distribution of Mo concentrations and δ97/95Mo values across Precambrian-Cambrian boundary in Meishucun and Gezhongwu sections, southern China. Thick gray lines represent Mo isotopic compositions of modern seawater (1.55‰ ± 0.17‰; Siebert et al., 2003) and marine Fe-Mn oxides (–0.45‰ ± 0.12‰; Barling and Anbar, 2004; Siebert et al., 2003). BYS—Baiyanshao Member; XWTS—Xiaowaitoushan Member; ZYC—Zhongyicun Member; DH—Dahai Member; SYT—Shiyantou Formation; DY—Precambrian Dengying Formation; GZW—Cambrian Gezhongwu Formation; NTT—Cambrian Niutitang Formation. Arrows labeled A, B, and C represent three biostratigraohic markers as described in text.]()
![Phosphatized moulds of the early Cambrian helcionelloid molluscs. (a) Oelandiella sp. from the Dahai Member (Meisuchunian) of southern China. (b) Anabarella sp. A. cf. plana from the Upper Alcudian of south-central Spain. (c) Pelagiella sp. from the Bystraya Formation (Botomian) of Transbaikal (southern Siberia). (d) Aldanella sp. from the Graviinaya River Fm of Taimyr (northern Siberia). (e) Barskovia sp. from the Pestrotsvet Formation (Tommotian) of the Selinde River (southeastern Siberia). (f) Watsonella sibirica from the Medvezhinskaya Formation of the Rassokha River (northeastern Siberia).]()
![Geological setting of the Guanshan frondose fossils. (a) Tectonic map illustrating the modern extent of the South China Block during Cambrian series 2. (b) Palaeogeographical reconstruction of the South China Block during Cambrian series 2. The close spatial proximity of the Chengjiang and Guanshan biotas should be noted. Modified from Zhu et al. (2019). (c) Simplified geological map showing the location of the fossil site at Gaoloufang, Kunming, Yunnan Province. (d) Late Ediacaran–early Cambrian stratigraphy of South China, with a lithostratigraphic log of the Wulongqing Formation (at right) showing the horizons that yielded the frondose fossils. FAD, first appearance datum; DLT, Donglongtan Member; JC, Jiucheng Member; BYS, Baiyanshao Member; DB, Daibu Member; ZYC, Zhongyichun Member; DH, Dahai Member. Radiometric ages are from Compston et al. (2008) (526.5 ± 1.1 Ma), Zhu et al. (2009) (535.2 ± 1.7 Ma) and Yang et al. (2018) (518.03 ± 0.69/0.71 Ma).]()
![First thumbnail for: Molybdenum isotopic records across the Precambrian...]()
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![(a) δ 34S versus Δ33S. The red, green and blue dots represent the isotopic data for stages 1–3, respectively (Stage 1: Donglongtan and Baiyanshao members; Stage 2: Daibu and Zhongyicun members; Stage 3: Dahai Member). The dashed red line (evolved oceanic sulphate) and the dashed and solid black lines (evolved pyrites with different fractionations, 34α = 0.975 and 34α = 0.985, respectively) represent Rayleigh-type isotopic trajectories under a closed system. The data in this study do not follow such a distillation-type evolution. (b) The black diamond represents the mean value for the grouped samples for Stage 2. The yellow-brown represents the mean value for the grouped samples for Stage 1. The dashed black line is the mixing curve that represents possible sulphur isotope compositions of influx sulphur for Stage 2, if the sulphur source is derived from younger deposited pyrites (this study) and sulphate (Wu et al.2015). The cloudy dots show examples of Monte Carlo simulation for predictions of coeval sulphate sulphur isotope compositions by using the average of pyrites for Stage 2. The maximum prediction for Δ33S coeval sulphate would approach the value of pyrite measured. Mixing of various portions of pyrites (Stage 2) and predicted sulphate cannot be reconciled with the estimates on the dashed black line. (c) The net shows an example of the allowed solution to the sulphur cycle model, similar to the one used in Wu et al. (2015) for sulphur isotopic compositions of pyrites. The configuration is constrained by the degree of sulphide reoxidation (fox: red number) and fraction of exchange between sulphur pools (fex: black numbers). It demonstrates that a single-isotope composition of sulphate (purple diamond) can produce pyrites with different isotopic compositions, and vice versa (b). Compositions of pyrites in one depositional environment may not represent the global average of buried pyrite and cannot yield unique predictions for seawater sulphur isotope compositions (b).]()
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![Age model output for global small skeletal fossil (SSF) biostratigraphy (updated from Bowyer et al., 2022). (A) 1—Ediacaran-Cambrian boundary ca. 538.8 Ma (International Chronostratigraphic Chart, 2022, of Cohen et al., 2013, updated) after maximum age for the first appearance datum (FAD) of Treptichnus pedum based on lithostratigraphic correlation to section hosting radiometric age (Namibia; see discussions in Bowyer et al., 2022; Nelson et al., 2022; and herein); 2—nadir of 1n/basal Cambrian δ13Ccarb excursion (BACE) after model C of Bowyer et al. (2022); 3—chemostratigraphically constrained maximum age for the FAD of T. pedum in the Esmeralda Member of the Deep Spring Formation, Mount Dunfee section, Nevada, USA (Laurentia; Smith et al., 2016b). SPIE—Spitskop δ13Ccarb excursion, Namibia; N—Nemakit; Atdab—Atdabanian. (B–C) Best-fit visual alignment of δ13Ccarb data calibrates associated biostratigraphy after (B) model E and (C) model F. All δ13Ccarb models include radiometrically calibrated and best-fit global data, color coded by region and updated with new data from the Kalahari craton, South Africa (Nelson et al., 2022), the Zavkhan terrane, Mongolia (Topper et al., 2022), and the southeast Siberian Platform (herein). KY—Kyra-Ytyga River mouth section. The Zhujiaqing carbon isotope excursion (ZHUCE) in the Dahai Member of South China is assumed to correlate with 6p in this model. Dashed vertical lines indicate uncertain range extensions. Single fragment of ?Barskovia sp. in the lower Platonovka Formation at Sukhaya Tunguska section may represent the earliest occurrence of stem group mollusks (Marusin et al., 2019). Historical biostratigraphic information from the Zuun-Arts and Bayan Gol formations of the Zavkhan terrane, Mongolia (as presented in Bowyer et al., 2022), is replaced herein by the chemostratigraphically calibrated biostratigraphy of Topper et al. (2022). Fossil occurrences in the phosphatic Zhongyicun Member of South China are not considered. (D) Temporal range of cloudinids according to models E and F, including (1) cloudinids recorded in the middle Ust’-Yudoma Formation at Kyra-Ytyga, and (2) chemostratigraphically well-constrained Zuunia chimidtsereni in the Zuun-Arts and lower Bayan Gol formations (Topper et al., 2022). Full age model spreadsheet is available upon request.]()
![Stratigraphic columns of the Precambrian-Cambrian sequences in the Kunming (a) and Zunyi (b) regions. DYF, DH, ZYC, DB, and BYS denote the Dengying Formation, and the Dahai, Zhongyicun, Daibu, and Baiyanshao Members, respectively (after Zhou et al. 2008).]()
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Journal Article
New carbon isotope stratigraphy of the Ediacaran–Cambrian boundary interval from SW China: implications for global correlation Available to Purchase
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 26 March 2009
Geological Magazine (2009) 146 (4): 465–484.
... reveal a large negative δ 13 C excursion (−7.2‰, L1′) in the Daibu Member, which matches the previously published data for the Laolin section, and a large positive excursion (+3.5‰, L4) in the Dahai Member, which was not shown in the published data. The excursion L1′ correlates well with the similarly...
Journal Article
Terreneuvian bio- and chemostratigraphy of the South Sichuan Region (South China) Available to Purchase
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 13 April 2021
Journal of the Geological Society (2021) 178 (5): jgs2020-167.
... to the ZHUCE excursion in the Dahai Member of eastern Yunnan. The shallow-water deposits of South Sichuan can be correlated with the South China, western Mongolia and Siberia successions based on biozonations and carbon isotope trends. Supplementary material: Isotope data are available at https://doi.org...
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Bio- and C-isotope stratigraphic correlation scheme between sections on the... Available to Purchase
in Terreneuvian bio- and chemostratigraphy of the South Sichuan Region (South China)
> Journal of the Geological Society
Published: 13 April 2021
Fig. 10 Bio- and C-isotope stratigraphic correlation scheme between sections on the Yangtze platform. The light yellow color with a ‘?' marks the poorly fossiliferous interzone which indicates an undetermined zonation. BYS, Baiyanshao Member; DB, Daibu Member; ZYC, Zhongyicun Member; DH, Dahai
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A: Covariations of highly reactive iron concentrations (Fe HR ) and δ 97/95... Available to Purchase
Published: 01 August 2011
—Baiyanshao Member; XWTS—Xiaowaitoushan Member; ZYC lower—lower Zhongyicun Member; ZYC upper—upper Zhongyicun Member; DH—Dahai Member.
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Figure 1 —Geographic location, stratigraphic column, fossil occurrence, an... Available to Purchase
in TANNUOLINA AND MICRINA (TANNUOLINIDAE) FROM THE LOWER CAMBRIAN OF EASTERN YUNNAN, SOUTH CHINA, AND THEIR SCLERITOME RECONSTRUCTION
> Journal of Paleontology
Published: 01 September 2004
Figure 1 —Geographic location, stratigraphic column, fossil occurrence, and Δ 13 C profile of the Xiaotan section. δ 13 C data from Zhou et al. (1997) . Note the positive δ 13 C excursion in the Dahai Member. The four SSF assemblages are I: Anabarites trisulcatus – Protohertzina anabrica ; II
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Stratigraphic distribution of Mo concentrations and δ 97/95 Mo values acros... Available to Purchase
Published: 01 August 2011
oxides (–0.45‰ ± 0.12‰; Barling and Anbar, 2004 ; Siebert et al., 2003 ). BYS—Baiyanshao Member; XWTS—Xiaowaitoushan Member; ZYC—Zhongyicun Member; DH—Dahai Member; SYT—Shiyantou Formation; DY—Precambrian Dengying Formation; GZW—Cambrian Gezhongwu Formation; NTT—Cambrian Niutitang Formation. Arrows
Journal Article
New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian- Cambrian boundary on the Yangtze Platform and global correlations: Comment and Reply Available to Purchase
Journal: Geology
Publisher: Geological Society of America
Published: 01 September 2001
Geology (2001) 29 (9): 871–872.
.... We are puzzled by the fact that all δ 13 C values reported by Shen and Schidlowski (2000) from the Dahai Member are below 0‰. According to Brasier et al. (1990) and Zhang et al. (1997) , the Daihai Member in east Yunnan and Sichuan shows a C isotope peak with δ 13 C values >0‰ and as high...
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Phosphatized moulds of the early Cambrian helcionelloid molluscs. (a) Oela... Available to Purchase
Published: 01 March 2002
Figure 2. Phosphatized moulds of the early Cambrian helcionelloid molluscs. (a) Oelandiella sp. from the Dahai Member (Meisuchunian) of southern China. (b) Anabarella sp. A. cf. plana from the Upper Alcudian of south-central Spain. (c) Pelagiella sp. from the Bystraya Formation
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Geological setting of the Guanshan frondose fossils. ( a ) Tectonic map ill... Available to Purchase
in A new Cambrian frondose organism: ‘Ediacaran survivor’ or convergent evolution?
> Journal of the Geological Society
Published: 07 February 2023
of the Wulongqing Formation (at right) showing the horizons that yielded the frondose fossils. FAD, first appearance datum; DLT, Donglongtan Member; JC, Jiucheng Member; BYS, Baiyanshao Member; DB, Daibu Member; ZYC, Zhongyichun Member; DH, Dahai Member. Radiometric ages are from Compston et al. (2008) (526.5
Journal Article
New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian-Cambrian boundary on the Yangtze Platform and global correlations Available to Purchase
Journal: Geology
Publisher: Geological Society of America
Published: 01 May 2001
Geology (2001) 29 (5): 471.
... and Archaelynthus macrospinosus near the top of a comparable Zhongyicun phosphorite bed, about 30 km east of our measured section (Luo et al., 1982), indicates that the C isotope peak in the Dahai Member is above the Tommotian. Because the lowest occurrence of archaeocyathan faunas has not yet been defined...
Journal Article
Molybdenum isotopic records across the Precambrian-Cambrian boundary Available to Purchase
Journal: Geology
Publisher: Geological Society of America
Published: 01 August 2011
Geology (2011) 39 (8): 775–778.
...—Baiyanshao Member; XWTS—Xiaowaitoushan Member; ZYC lower—lower Zhongyicun Member; ZYC upper—upper Zhongyicun Member; DH—Dahai Member. ...
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(a) δ 34 S versus Δ 33 S. The red, green and blue dots represent the isoto... Available to Purchase
in Heterogeneity in the Ediacaran–Cambrian coastal oceans: a sulphur isotope perspective
> Geological Magazine
Published: 08 November 2019
Fig. 3. (a) δ 34 S versus Δ 33 S. The red, green and blue dots represent the isotopic data for stages 1–3, respectively (Stage 1: Donglongtan and Baiyanshao members; Stage 2: Daibu and Zhongyicun members; Stage 3: Dahai Member). The dashed red line (evolved oceanic sulphate) and the dashed
Journal Article
Heterogeneity in the Ediacaran–Cambrian coastal oceans: a sulphur isotope perspective Available to Purchase
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 08 November 2019
Geological Magazine (2020) 157 (7): 1112–1120.
...Fig. 3. (a) δ 34 S versus Δ 33 S. The red, green and blue dots represent the isotopic data for stages 1–3, respectively (Stage 1: Donglongtan and Baiyanshao members; Stage 2: Daibu and Zhongyicun members; Stage 3: Dahai Member). The dashed red line (evolved oceanic sulphate) and the dashed...
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Sulphur isotopic compositions of sedimentary pyrites from Xiaotan section, ... Available to Purchase
in Heterogeneity in the Ediacaran–Cambrian coastal oceans: a sulphur isotope perspective
> Geological Magazine
Published: 08 November 2019
Table 1. Sulphur isotopic compositions of sedimentary pyrites from Xiaotan section, South China Sample ID Stratigraphic unit (Member) Depth (m) δ 34 S Δ 33 S XT109 Dahai 273 20.2 −0.009 XT111 Dahai 271 20.8 0.009 XT116 Dahai 263 23.5 0.028 XT121 Dahai
Journal Article
New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian-Cambrian boundary on the Yangtze Platform and global correlations Available to Purchase
Journal: Geology
Publisher: Geological Society of America
Published: 01 July 2000
Geology (2000) 28 (7): 623–626.
..., and Dahai Members in an upward direction. The Baiyanshao Member is about 67 m thick, and consists of dolostones. The lowest small shelly fossils (marker A) occur at the base of the Xiaowaitoushan Member ( Luo et al., 1991 ). The lower part of the Xiaowaitoushan Member contains cherts intercalated with thin...
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Age model output for global small skeletal fossil (SSF) biostratigraphy (up... Available to Purchase
in Implications of an integrated late Ediacaran to early Cambrian stratigraphy of the Siberian Platform, Russia
> GSA Bulletin
Published: 11 January 2023
, Mongolia ( Topper et al., 2022 ), and the southeast Siberian Platform (herein). KY—Kyra-Ytyga River mouth section. The Zhujiaqing carbon isotope excursion (ZHUCE) in the Dahai Member of South China is assumed to correlate with 6p in this model. Dashed vertical lines indicate uncertain range extensions
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Stratigraphic columns of the Precambrian-Cambrian sequences in the Kunming ... Available to Purchase
Published: 01 January 2016
Figure 3 Stratigraphic columns of the Precambrian-Cambrian sequences in the Kunming ( a ) and Zunyi ( b ) regions. DYF, DH, ZYC, DB, and BYS denote the Dengying Formation, and the Dahai, Zhongyicun, Daibu, and Baiyanshao Members, respectively (after Zhou et al. 2008 ).
Journal Article
Correlation and stratigraphic implications of the lowermost Cambrian small shelly fossils from new sites of South China Open Access
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 22 August 2024
Journal of the Geological Society (2024) 181 (6): jgs2023-231.
... in SW China ( Luo et al. 1980 ; Zhu 2001 ; Yang et al. 2014 ). The lowermost Cambrian stratigraphy in Yunnan is dominated by the Zhujiaqing Formation ( Zhu 2001 ), which has been divided into three members ( Zhu 2010 ): the Daibu Member, the Zhongyicun Member and the Dahai Member of the Xiaotan...
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Journal Article
Meishucun phosphorite succession (SW China) records redox changes of the early Cambrian ocean Available to Purchase
Journal: GSA Bulletin
Publisher: Geological Society of America
Published: 07 July 2017
GSA Bulletin (2017) 129 (11-12): 1554–1567.
... and the early Cambrian Xiaowaitoushan, Zhongyicun, Dahai, and Shiyantou Members of the Zhujiaqing Formation ( Fig. 2 ; supplementary Fig. A1 1 ), and it was one of the global stratotype section and point candidates for the Precambrian-Cambrian boundary ( Xing and Luo, 1984 ). The Baiyanshao and Xiaowaitoushan...
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Includes: Supplemental Content
Journal Article
CARBON ISOTOPE COMPOSITION OF THE HESEN AND CHULAKTAU FORMATIONS ( Hövsgöl and Karatau phosphorite basins ) Available to Purchase
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 November 2004
Russ. Geol. Geophys. (2004) 45 (11): 1348–1354.
..., δ 13 C increases from –2 to 0 and up to +7‰ upsection. The Chulaktau Formation shows a similar δ 13 C behavior, with δ 13 C of about –6‰ in phosphorites, dolomites, and other phosphate and carbonate rocks. The lower dolomite member and ferromanganese horizon have δ 13 C values close to zero...
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