DOI: 10.1016/j.epsl.2018.04.010
Scopus记录号: 2-s2.0-85045476588
论文题名: Variable sulfur isotope composition of sulfides provide evidence for multiple sources of contamination in the Rustenburg Layered Suite, Bushveld Complex
作者: Magalhães N. ; Penniston-Dorland S. ; Farquhar J. ; Mathez E.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492 起始页码: 163
结束页码: 173
语种: 英语
英文关键词: Bushveld Complex
; crustal contamination
; Rustenburg Layered Suite
; sulfur isotopes
Scopus关键词: Stratigraphy
; Sulfur compounds
; Bushveld Complex
; Crustal contamination
; Formation and evolutions
; Negative correlation
; Platinum group elements
; Positive correlations
; Rustenburg Layered Suite
; Sulfur isotope
; Isotopes
; crustal contamination
; isotopic composition
; magma
; mineralization
; stratigraphy
; sulfide
; sulfur isotope
; Bushveld Complex
; North West Province
; Rustenburg
; South Africa
英文摘要: The Rustenburg Layered Suite (RLS) of the Bushveld Complex (BC) is famous for its platinum group element (PGE) ore, which is hosted in sulfides. The source of sulfur necessary to generate this type of mineralization is inferred to be the host rock of the intrusion. The RLS has a sulfur isotopic signature that indicates the presence of Archean surface-derived material (Δ33S≠0) in the magma. This signature, with an average value of Δ33S=0.112±0.024‰ deviates from the expected Δ33S value of the mantle of 0±0.008‰. Previous work suggested that this signature is uniform throughout the RLS, which contrasts with radiogenic isotopes which vary throughout the igneous stratigraphy of the RLS. In this study, samples from key intervals within the igneous stratigraphy were analyzed, showing that Δ33S values vary in the same stratigraphic levels as Sr and Nd isotopes. However, the variation is not consistent; in some levels there is a positive correlation and in others a negative correlation. This observation suggests that in some cases distinct magma pulses contained assimilated sulfur from different sources. Textural analysis shows no evidence for late addition of sulfur. These results also suggest that it is unlikely that large-scale assimilation and/or efficient mixing of host rock material in a single magma chamber occurred during emplacement. The data do not uniquely identify the source of sulfur in the different layers of the RLS, but the variation in sulfur isotope composition and its relationship to radiogenic isotope data calls for a reevaluation of the models for the formation and evolution of the RLS, which has the potential to impact the knowledge of how PGE deposits form. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109909
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geology, University of Maryland, 8000 Regents Dr, College Park, MD 20742, United States; Department of Earth and Planetary Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, United States
Recommended Citation:
Magalhães N.,Penniston-Dorland S.,Farquhar J.,et al. Variable sulfur isotope composition of sulfides provide evidence for multiple sources of contamination in the Rustenburg Layered Suite, Bushveld Complex[J]. Earth and Planetary Science Letters,2018-01-01,492