eprintid: 10195666
rev_number: 7
eprint_status: archive
userid: 699
dir: disk0/10/19/56/66
datestamp: 2024-08-13 10:56:06
lastmod: 2024-08-13 10:56:06
status_changed: 2024-08-13 10:56:06
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Zhang, K
creators_name: Shields, GA
creators_name: Zhou, Y
creators_name: Strauss, H
creators_name: Struck, U
creators_name: Jensen, S
title: The basal Cambrian carbon isotope excursion revealed in the Central Iberian Zone, Spain
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F57
keywords: Ediacaran, 
Cambrian, 
Carbon isotopes, 
Nitrogen isotopes
note: © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
abstract: The causes of early metazoan diversification during the Ediacaran-Cambrian transition interval are controversial, partly because the global correlation of the Ediacaran-Cambrian boundary remains problematic due to a lack of unambiguous stratigraphic markers. Here we report geochemical data from two fossiliferous sections (Majada de Andaluz and Vía Verde) that straddle the Ediacaran-Cambrian interval in the Central Iberian Zone, Spain. Carbon isotope chemostratigraphy reveals a rise to a low positive δ13Ccarb plateau at the base of the Majada section, which is associated with the first appearance of Cloudina and a pristine Sr isotope value of 0.708512, suggesting that the lower Villarta Formation correlates with the terminal Ediacaran strata in China and Namibia. A prominent negative δ13Ccarb excursion is also revealed from the lower member of the Villarta Formation at Majada, likely corresponding to the global basal Cambrian carbon isotope excursion (BACE). Nitrogen isotope data from the correlative Vía Verde section reveal a similar trend to that found in coeval strata of South China, and indicate a change from predominantly anaerobic to aerobic nitrogen cycling in Central Iberia. By correlating sections in which both the BACE excursion and Treptichnus pedum are recognized, it appears that T. pedum is exclusively found above the BACE, which postdates the last appearance of Cloudina and a negative δ13Ccarb plateau. Further studies of sections with both fossil and isotopic control will help to constrain the timing and causation of Ediacaran-Cambrian bioradiations as well as their relationship to global carbon cycle perturbations.
date: 2024-09-01
date_type: published
publisher: Elsevier BV
official_url: https://doi.org/10.1016/j.precamres.2024.107526
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2303974
doi: 10.1016/j.precamres.2024.107526
lyricists_name: Shields, Graham
lyricists_id: GASHI56
actors_name: Shields, Graham
actors_id: GASHI56
actors_role: owner
full_text_status: public
publication: Precambrian Research
volume: 411
article_number: 107526
issn: 0301-9268
citation:        Zhang, K;    Shields, GA;    Zhou, Y;    Strauss, H;    Struck, U;    Jensen, S;      (2024)    The basal Cambrian carbon isotope excursion revealed in the Central Iberian Zone, Spain.                   Precambrian Research , 411     , Article 107526.  10.1016/j.precamres.2024.107526 <https://doi.org/10.1016/j.precamres.2024.107526>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10195666/1/Zhang%20et%20al%20%282024%29%20Ed-C%20boundary%20in%20Spain.pdf