التفاصيل البيبلوغرافية
| العنوان: |
Tracking halogen recycling and volatile loss in kimberlite magmatism from Greenland: Evidence from combined F-Cl-Br and δ37Cl systematics |
| المؤلفون: |
Hoare, Brendan C., Tomlinson, Emma L., Barnes, Jaime D., Tappe, Sebastian, Marks, Michael A.W., Epp, Tatjana, Caulfield, John, Riegler, Thomas |
| المصدر: |
Lithos |
| بيانات النشر: |
Elsevier |
| سنة النشر: |
2021 |
| المجموعة: |
Queensland University of Technology: QUT ePrints |
| الوصف: |
Kimberlite magmatism occurs as a result of volatile fluxed melting of the convecting upper mantle underlying cratonic lithospheric mantle regions. During passage to the Earth's surface, proto-kimberlite magma can interact with, and assimilate, variably enriched cratonic mantle producing hybrid melts consisting of asthenospheric and cratonic mantle components including contributions from metasomatic domains. The halogen elements (F, Cl, Br, I) and chlorine isotope ratios ( 37 Cl/ 35 Cl) are increasingly used as tracers of recycled crustal materials within the Earth's mantle yet are only rarely reported in analyses of kimberlites. As a result, the origin and distribution of halogens in kimberlite magmas is poorly constrained. Here, we present novel, combined elemental (F, Cl, Br) and isotopic (δ 37 Cl) halogen data for 14 fresh kimberlite samples from the North Atlantic Craton (NAC) of West and South-West Greenland. The F composition of kimberlites from the NAC appears to be controlled by melting in the convecting upper mantle with minimal effect from interaction with metasomatized lithospheric mantle or volatile loss during or after emplacement. By contrast, Cl and Br in the studied samples have undergone significant devolatilization during kimberlite dyke emplacement and post-emplacement processes, whereby up to 99% of the original halogen budget was removed. Whilst all the studied kimberlites broadly follow the same geochemical pattern, there exists some regional variability in their halogen systematics. The northern NAC kimberlite samples from Majuagaa have mantle-like δ 37 Cl values of −0.2 to −0.5‰ [versus SMOC (standard mean ocean chloride)]. In contrast, kimberlite dykes from Nigerdlikasik and Pyramidefjeld near the southern craton margin display positive δ 37 Cl values of +0.4‰ to +1.3‰, in addition to a relative Cl and Br enrichment, which is consistent with the assimilation of recycled crust-derived halogens by the kimberlite magmas. The data support a scenario in which recycled halogens were sampled ... |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf |
| اللغة: |
unknown |
| Relation: |
https://eprints.qut.edu.au/235699/1/1_s2.0_S0024493721000128_main.pdf; Hoare, Brendan C., Tomlinson, Emma L., Barnes, Jaime D., Tappe, Sebastian, Marks, Michael A.W., Epp, Tatjana, Caulfield, John, & Riegler, Thomas (2021) Tracking halogen recycling and volatile loss in kimberlite magmatism from Greenland: Evidence from combined F-Cl-Br and δ37Cl systematics. Lithos, 384-385, Article number: 105976.; https://eprints.qut.edu.au/235699/; Academic Division |
| الاتاحة: |
https://eprints.qut.edu.au/235699/ |
| Rights: |
free_to_read ; http://creativecommons.org/licenses/by/4.0/ ; © 2021 The Authors ; This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
| رقم الانضمام: |
edsbas.84B79677 |
| قاعدة البيانات: |
BASE |