DOI: 10.1016/j.palaeo.2013.07.007
论文题名: Early and late neoproterozoic c, o and sr isotope chemostratigraphy in the carbonates of west congo and mbuji-mayi supergroups: A preserved marine signature?
作者: Delpomdor F. ; Préat A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 389 起始页码: 35
结束页码: 47
语种: 英语
英文关键词: Carbonates
; Chemostratigraphy
; Mbuji-Mayi Supergroup
; Neoproterozoic
; West Congo Supergroup
英文摘要: The carbon, oxygen and strontium isotope geochemistry is the most widely applied chemostratigraphic tool in the reconstruction of paleoenvironments and indirect regional or global correlations for the Neoproterozoic times. Relatively good preserved carbonate rocks of the West Congo Supergroup, i.e. the Schisto-Calcaire Subgroup of the Democratic Republic of Congo and Gabon, and the Mbuji-Mayi Supergroup, i.e. the BII group from the Democratic Republic of Congo, make these Neoproterozoic successions unique for chemostratigraphical studies. In this paper, we propose to discuss on the fidelity of δ13Ccarb and Sr signatures in Neoproterozoic carbonates on the basis of a severe diagenetic control, using trace and major geochemistry, combined with C and O stable isotope analysis. Our result highlights that the δ13Ccarb fluctuations of the Schisto-Calcaire Subgroup reflect (i) facies variations, (ii) exchanges between isotopically light carbon in meteoric waters and carbonate during lithification and early diagenesis, and/or (iii) regional metamorphism grades rather than temporal signals of ocean chemistry, while in the unmetamorphosed carbonates of the Mbuji-Mayi Supergroup, reported to the Bitter Springs anomaly (~810Ma), the use of δ13C ratios are worldwide applicable for inter-basin correlations. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69605
Appears in Collections: 过去全球变化的重建
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作者单位: Université libre de Bruxelles, Biogeochemistry and Modeling of the Earth System, Belgium
Recommended Citation:
Delpomdor F.,Préat A.. Early and late neoproterozoic c, o and sr isotope chemostratigraphy in the carbonates of west congo and mbuji-mayi supergroups: A preserved marine signature?[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,389