globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116848
论文题名:
Deciphering variable mantle sources and hydrous inputs to arc magmas in Kamchatka
作者: Iveson A.A.; Humphreys M.C.S.; Savov I.P.; de Hoog J.C.M.; Turner S.J.; Churikova T.G.; Macpherson C.G.; Mather T.A.; Gordeychik B.N.; Tomanikova L.; Agostini S.; Hammond K.; Pyle D.M.; Cooper G.F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 562
语种: 英语
中文关键词: boron isotopes ; Kamchatka ; mantle ; melt inclusion ; metasomatism ; subduction zone
英文关键词: Melting ; Mineralogy ; Mixing ; Silicate minerals ; Trace elements ; Volcanoes ; Compositional heterogeneity ; Compositional variability ; Depleted MORB mantles ; Geochemical indicators ; Isotope compositions ; Mantle heterogeneity ; Parental magma composition ; Systematic variation ; Analytical geochemistry ; boron isotope ; hydrous mineral ; magma ; mantle source ; melt inclusion ; metasomatism ; olivine ; subduction zone ; Kamchatka ; Russian Federation
英文摘要: The chemistry of primitive arc rocks provides a window into compositional variability in the mantle wedge, as well as slab-derived inputs to subduction-related magmatism. However, in the long-term cycling of elements between Earth's internal and external reservoirs, a key unknown is the importance of retaining mobile elements within the subduction system, through subduction-related metasomatism of the mantle. To address these questions, we have analysed olivine-hosted melt inclusions and corresponding bulk rocks from the Kamchatka arc. Suites of melt inclusions record evidence for entrapment along melt mixing arrays during assembly of diverse parental magma compositions. Systematic variations in parental magma B/Zr, Nb/Zr, Ce/B, and δ11B are also apparent among the different eruptive centres studied. These element ratios constrain the nature of subduction-related metasomatism and provide evidence for ambient mantle heterogeneity and variable degrees of mantle melting. High Nb/Zr and low B/Zr in back-arc rocks indicate smaller degree melts, lower slab-derived inputs, but relatively enriched mantle compositions. Similarly, small monogenetic eruptive centres located away from the main stratocones also tend to erupt magmas with relatively lower slab contribution and overall smaller melting degrees. Conversely, arc-front compositions reflect greater slab contributions and larger degree melts of a more depleted ambient mantle. Across-arc variations in δ11B (ranging from ca. −6‰ in the rear-arc and Sredinny Ridge to +7‰ in the Central Kamchatka Depression) are generally consistent with variable addition of an isotopically heavy slab-derived component to a depleted MORB mantle composition. However, individual volcanic centres (e.g. Bakening volcano) show correlations between melt inclusion δ11B and other geochemical indicators (e.g. Cl/K2O, Ce/B) that require mixing between isotopically distinct melt batches that have undergone different extents of crustal evolution and degassing processes. Our results show that while melt inclusion volatile inventories are largely overprinted during shallower melt storage and aggregation, incompatible trace element ratios and B isotope compositions more faithfully trace initial mantle compositions and subduction inputs. Furthermore, we suggest that the signals of compositional heterogeneity generated in the sub-arc mantle by protracted metasomatism during earlier phases of subduction can be preserved during later magma assembly and storage in the crust. © 2021 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165523
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作者单位: Department of Earth Sciences, Science Site, Durham University, Durham, DH1 3LE, United Kingdom; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, United Kingdom; School of Earth & Environment, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, United Kingdom; Grant Institute, School of GeoSciences, University of Edinburgh, West Mains Road, Edinburgh, EH9 3JW, United Kingdom; Department of Geosciences, University of Massachusetts Amherst, Amherst, MA 01003, United States; Institute of Volcanology and Seismology FED, RAS, Piip Avenue 9, Petropavlovsk-Kamchatsky, 683006, Russian Federation; GZG, Abt. Geochemie, Göttingen Universität, Göttingen, 37077, Germany; Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, 142432, Russian Federation; Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche (CNR), Via Moruzzi, 1, Pisa, 56124, Italy; Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY 10024, United States; School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, BS8 1RJ, United Kingdom

Recommended Citation:
Iveson A.A.,Humphreys M.C.S.,Savov I.P.,et al. Deciphering variable mantle sources and hydrous inputs to arc magmas in Kamchatka[J]. Earth and Planetary Science Letters,2021-01-01,562
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