DOI: 10.1038/ngeo2373
论文题名: Transport of metals and sulphur in magmas by flotation of sulphide melt on vapour bubbles
作者: Mungall J.E. ; Brenan J.M. ; Godel B. ; Barnes S.J. ; Gaillard F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 3 起始页码: 216
结束页码: 219
语种: 英语
Scopus关键词: atmospheric pollution
; crust
; global change
; magma
; mass balance
; metal
; ore deposit
; reservoir characterization
; sulfur
; volcanic eruption
英文摘要: Emissions of sulphur and metals from magmas in Earth's shallow crust can have global impacts on human society. Sulphur-bearing gases emitted into the atmosphere during volcanic eruptions affect climate, and metals and sulphur can accumulate in the crust above a magma reservoir to form giant copper and gold ore deposits, as well as massive sulphur anomalies. The volumes of sulphur and metals that accumulate in the crust over time exceed the amounts that could have been derived from an isolated magma reservoir. They are instead thought to come from injections of multiple new batches of vapour- and sulphide-saturated magmas into the existing reservoirs. However, the mechanism for the selective upward transfer of sulphur and metals is poorly understood because their main carrier phase, sulphide melt, is dense and is assumed to settle to the bottoms of magma reservoirs. Here we use laboratory experiments as well as gas-speciation and mass-balance models to show that droplets of sulphide melt can attach to vapour bubbles to form compound drops that float. We demonstrate the feasibility of this mechanism for the upward mobility of sulphide liquids to the shallow crust. Our work provides a mechanism for the atmospheric release of large amounts of sulphur, and contradicts the widely held assumption that dense sulphide liquids rich in sulphur, copper and gold will remain sequestered in the deep crust. © 2015 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106272
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth Sciences, University of Toronto, 22 Russell St, Toronto, ON, Canada; CSIRO Mineral Resources Flagship, 26 Dick Perry Ave, Kensington, WA, Australia; CNRS-Université d'Orléans-BRGM, UMR 7327, 1A, rue de la Férollerie, Orléans, France
Recommended Citation:
Mungall J.E.,Brenan J.M.,Godel B.,et al. Transport of metals and sulphur in magmas by flotation of sulphide melt on vapour bubbles[J]. Nature Geoscience,2015-01-01,8(3)