globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.06.019
Scopus记录号: 2-s2.0-85048955985
论文题名:
Generation of arc rhyodacites through cumulate-melt reactions in a deep crustal hot zone: Evidence from Nisyros volcano
作者: Klaver M.; Blundy J.D.; Vroon P.Z.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 497
起始页码: 169
结束页码: 180
语种: 英语
英文关键词: Aegean arc ; amphibole ; calc-alkaline (rhyo)dacites ; magma differentiation ; melt-cumulate reaction ; Nisyros
Scopus关键词: Mixing ; Silica ; Aegean arc ; amphibole ; Dacites ; Magma differentiation ; Nisyros ; Trace elements ; amphibole ; crustal deformation ; dacite ; magmatic differentiation ; melt inclusion ; rhyolite ; Dodecanese ; Greece ; Kos [Southern Aegean] ; Nisyros ; Southern Aegean ; Indicator minor
英文摘要: The generation of continental crust of intermediate composition occurs predominantly in convergent margin settings, yet the mechanisms by which felsic, calc-alkaline arc magmas are generated remain poorly understood. Magma mixing appears to be a common process in voluminous intermediate arc rocks but the composition of the felsic mixing endmember is typically obscured by the mixing process. We investigate a suite of porphyritic (rhyo)dacitic magmas (65–72 wt.% SiO2) from Nisyros, a young stratovolcano in the Aegean arc, Greece. These magmas are not affected by shallow process such as hybridisation or crystal-melt segregation and thus offer a valuable insight into the origin of felsic melts at convergent margins. We find that the Nisyros (rhyo)dacites form through a reaction in which earlier-formed wehrlite cumulates in the deep arc crust react with melts to form amphibole. This implies that melt major element compositions are effectively buffered by a low-variance mineral assemblage to follow this peritectic boundary such that the silica content of melts extracted from the deep crustal hot zone is controlled by the amount of amphibole crystallised. The resorption of cumulates is pivotal in imparting a distinct trace element signature that is decoupled from major element systematics. For example, high compatible element contents and a strong amphibole signature (low Y and Dy/Yb) cannot be captured by simple crystallisation models and require cumulate resorption. Variable radiogenic isotope systematics indicate minor crustal contamination although assimilation is not proportional to silica content and hence not a main driving force behind the generation of felsic melts. Instead, the Nisyros (rhyo)dacites formed through melt-cumulate reaction processes prior to emplacement as mush bodies at shallow depth and partial eruption. Magma mixing only becomes an important process in the youngest unit on Nisyros. On a global scale, peritectic boundary melts are rarely sampled in the whole rock or melt inclusion record. Conversely, peritectic boundary melts do form a suitable felsic mixing endmember for the generation of voluminous “monotonous intermediate” magmas. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109778
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: School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, BS8 1RJ, United Kingdom; Department of Geology and Geochemistry, Vrije Universiteit Amsterdam, De Boelelaan 1085, Amsterdam, 1081HV, Netherlands

Recommended Citation:
Klaver M.,Blundy J.D.,Vroon P.Z.. Generation of arc rhyodacites through cumulate-melt reactions in a deep crustal hot zone: Evidence from Nisyros volcano[J]. Earth and Planetary Science Letters,2018-01-01,497
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