Paleoenvironmental redox evolution of Ediacaran-Cambrian restricted seas in the core of West Gondwana: Insights from trace-metal geochemistry and stratigraphy of the Bambui Group, east Brazil

Author(s)

Guacaneme, Cristian ; Caetano-Filho, Sergio ; Paula-Santos, Gustavo M. ; Babinski, Marly ; Fraga-Ferreira, Paula L. ; Bedoya-Rueda, Carolina ; Kuchenbecker, Matheus ; Reis, Humberto L. S. ; Trindade, Ricardo I. F.

• Document type: Journal article
• Source: Journal of South American Earth Sciences; v. 119, p. 19-pg., 2022-09-01.

Abstract

The sedimentary evolution of the Bambuf foreland basin system in the interior of West Gondwana is marked by periods of connection and isolation from the global ocean during the late Neoproterozoic and early Paleozoic. To understand the link between these periods and seawater redox conditions, we present an integrated study of trace-metal geochemistry and stratigraphy of the carbonate-siliciclastic rocks from the two lowermost second order transgressive-regressive sequences of the Bambuf Group, east Brazil. The basal 2nd-order sequence trace -metal pattern shows a progressive decrease of mass fractions of Co, Cr, Ni, Cu, Mo, U, V, Zn, and Cd, concomitant with a progressive decrease of Al and Fe contents and Mo/TOC ratios. Among all these elements, only Cd, Mo and U mass fractions seem to be less or not affected by detrital influence, so they can be used as reliable redox proxies for the paleoenvironmental analysis of the studied Bambuf strata. Moreover, normalization to aluminum shows a progressive increase of trace-metal enrichments for Cd and Mo in the order of 0.1-10 times and for U in the order of 1-100 times, accompanied by a progressive increase of organic carbon content upward section. These changes in sedimentary trace-metal patterns provide evidence for the chemical evolution of basinal deep-waters, whose conditions changed progressively from suboxic-anoxic to anoxic-euxinic at the basal transgressive-regressive sequence. We suggest that the paleomarine system represented by the basal Bambuf Group has probably evolved as an intracontinental silled basin recording changes in seawater chemistry associated with redox variations and restricted hydrographic conditions. Sedimentary trace-metal patterns indicate that Bambuf epeiric sea was initially in communication with open ocean followed by the marine restriction during the transgressive and regressive cycles, respectively. This resulted in a long deepwater residence time and chemical evolution of deep watermass as a response to tectonic pulses and consequent sea-level variations during the restricted stage. Under anoxic-euxinic conditions of seawater, trace metals scarcity and micronutrient fixation limitation would have impacted nitrate bioavailability, preventing the evolution of early benthic metazoans in the Bambuf paleomarine system during the late Ediacaran and early Cambrian. (AU)

• FAPESP's process: 16/06114-6 - The Neoproterozoic Earth System and the rise of biological complexity
• Grantee: Ricardo Ivan Ferreira da Trindade
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/13228-6 - The nitrogen biogeochemical cycle on Ediacaran rocks: a study on carbonates from the Bambuí Group, São Francisco Basin
• Grantee: Paula Luiza Fraga Ferreira
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 17/00399-1 - Chemical weathering and nutrient input into late Ediacaran ocean and their relationship to life diversification
• Grantee: Gustavo Macedo de Paula Santos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 16/11496-5 - Sulfur and Carbon biogeochemical cycles in the Ediacaran and their record in Brazilian sedimentary successions
• Grantee: Sergio Caetano Filho
• Support Opportunities: Scholarships in Brazil - Doctorate