Szczegóły publikacji
Opis bibliograficzny
Halogens in eclogite facies minerals from the Western Gneiss Region, Norway / Lewis Hughes, Simon CUTHBERT, Alex Quas-Cohen, Lorraine Ruzié-Hamilton, Alison Pawley, Giles Droop, Ian Lyon, Romain Tartèse, Ray Burgess // Minerals [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 2075-163X. — 2021 — vol. 11 iss. 7 art. no. 760, s. 1–33. — Wymagania systemowe: Adobe Reader. — Bibliogr. s. 29–33, Abstr. — Publikacja dostępna online od: 2021-07-14
Autorzy (9)
- Hughes Lewis
- AGHCuthbert Simon
- Quas-Cohen Alex
- Ruzié-Hamilton Lorraine
- Pawley Alison
- Droop Giles
- Lyon Ian
- Tartèse Romain
- Burgess Ray
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 135349 |
|---|---|
| Data dodania do BaDAP | 2021-07-28 |
| Tekst źródłowy | URL |
| DOI | 10.3390/min11070760 |
| Rok publikacji | 2021 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Minerals |
Abstract
Ultra-high-pressure (UHP) eclogites and ultramafites and associated fluid inclusions from the Western Gneiss Region, Norwegian Caledonides, have been analysed for F, Cl, Br and I using electron-probe micro-analysis, time-of-flight secondary ion mass spectrometry and neutron-irradiated noble gas mass spectrometry. Textures of multi-phase and fluid inclusions in the cores of silicate grains indicate formation during growth of the host crystal at UHP. Halogens are predominantly hosted by fluid inclusions with a minor component from mineral inclusions such as biotite, phengite, amphibole and apatite. The reconstructed fluid composition contains between 11.3 and 12.1 wt% Cl, 870 and 8900 ppm Br and 6 and 169 ppm I. F/Cl ratios indicate efficient fractionation of F from Cl by hydrous mineral crystallisation. Heavy halogen ratios are higher than modern seawater by up to two orders of magnitude for Br/Cl and up to three orders of magnitude for I/Cl. No correlation exists between Cl and Br or I, while Br and I show good correlation, suggesting that Cl behaved differently to Br and I during subduction. Evolution to higher Br/Cl ratios is similar to trends defined by eclogitic hydration reactions and seawater evaporation, indicating preferential removal of Cl from the fluid during UHP metamorphism. This study, by analogy, offers a field model for an alternative source (continental crust) and mechanism (metasomatism by partial melts or supercritical fluids) by which halogens may be transferred to and stored in the sub-continental lithospheric mantle during transient subduction of a continental margin.
