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Sulphur isotopes of alkaline magmas unlock long-term records of crustal recycling on Earth

Hutchison, William; Babiel, Rainer J.; Finch, Adrian A.; Marks, Michael A. W.; Markl, Gregor; Boyce, Adrian J.; Stüeken, Eva E.; Friis, Henrik; Borst, Anouk M.; Horsburgh, Nicola J.

Abstract:
Earth’s surface and mantle sulphur reservoirs are connected via subduction, crustal recycling and volcanism. Although oceanic hotspot lavas currently provide the best constraints on the deep sulphur cycle, their restricted age range (<200 Ma) means they cannot reveal temporal variations in crustal recycling over Earth history. Sulphur-rich alkaline magmas offer the solution because they are associated with recycled sources (i.e. metasomatized lithospheric mantle and plumes) and, crucially, are found throughout the geological record. Here, we present a detailed study of sulphur isotope fractionation in a Mesoproterozoic alkaline province in Greenland and demonstrate that an enriched subduction-influenced source (δ$^{34}$S of +1 to +5‰) can be reconstructed. A global δ$^{34}$S compilation reveals secular variation in alkaline magma sources which support changes in the composition of the lithospheric mantle and/or Ga timescales for deep crustal recycling. Thus, alkaline magmas represent a powerful yet underutilized repository for interrogating crustal recycling through geological time.

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Verlagsausgabe §
DOI: 10.5445/IR/1000099097
Veröffentlicht am 17.10.2019
Originalveröffentlichung
DOI: 10.1038/s41467-019-12218-1
Scopus
Zitationen: 1
Coverbild
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000099097
Erschienen in Nature Communications
Band 10
Heft 1
Seiten Art.-Nr.: 4208
Vorab online veröffentlicht am 16.09.2019
Nachgewiesen in Web of Science
Scopus
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