DOI: 10.1016/j.epsl.2018.03.042
Scopus记录号: 2-s2.0-85044570863
论文题名: Modulation of magmatic processes by CO2 flushing
作者: Caricchi L. ; Sheldrake T.E. ; Blundy J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 491 起始页码: 160
结束页码: 171
语种: 英语
英文关键词: CO2 flushing
; ore deposits
; petrology
; volcanology
Scopus关键词: Chemical stability
; Deposits
; Ore deposits
; Petrology
; Volcanoes
; Chemical evolution
; CO2 flushing
; Magma reservoirs
; Magmatic process
; Magmatic systems
; Ore-forming fluid
; Volcanic eruptions
; volcanology
; Carbon dioxide
英文摘要: Magmatic systems are the engines driving volcanic eruptions and the source of fluids responsible for the formation of porphyry-type ore deposits. Sudden variations of pressure, temperature and volume in magmatic systems can produce unrest, which may culminate in a volcanic eruption and/or the abrupt release of ore-forming fluids. Such variations of the conditions within magmatic systems are commonly ascribed to the injection of new magma from depth. However, as magmas fractionating at depth or rising to the upper crust release CO2-rich fluids, the interaction between carbonic fluids and H2O-rich magmas stored in the upper crust (CO2 flushing), must also be a common process affecting the evolution of subvolcanic magma reservoirs. Here, we investigate the effect of gas injection on the stability and chemical evolution of magmatic systems. We calculate the chemical and physical evolution of magmas subjected to CO2-flushing using rhyolite-MELTS. We compare the calculations with a set of melt inclusion data for Mt. St. Helens, Merapi, Etna, and Stromboli volcanoes. We provide an approach that can be used to distinguish between melt inclusions trapped during CO2 flushing, magma ascent and decompression, or those affected by post-entrapment H2O-loss. Our results show that CO2 flushing is a widespread process in both felsic and mafic magmatic systems. Depending upon initial magma crystallinity and duration of CO2 input, flushing can either lead to volcanic eruption or fluid release. We suggest that CO2 flushing is a fundamental process modulating the behaviour and chemical evolution of crustal magmatic systems. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109911
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 Earth Sciences, University of Geneva, Rue des Maraîchers 13, Geneva, 1205, Switzerland; School of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom
Recommended Citation:
Caricchi L.,Sheldrake T.E.,Blundy J.. Modulation of magmatic processes by CO2 flushing[J]. Earth and Planetary Science Letters,2018-01-01,491