Hydrous Phase Relations and Trace Element Partitioning Behaviour in Calcareous Sediments at Subduction-Zone Conditions
Susanne Skora, Jon D Blundy, Richard A Brooker, Eleanor CR Green, Jan CM de Hoog, James AD Connolly
JOURNAL OF PETROLOGY | OXFORD UNIV PRESS | Published : 2015
We report the results of experiments on two natural marine sediments with different carbonate contents (calcareous clay: CO2 = 6·1 wt %; marl: CO2 = 16·2 wt %) at subduction-zone conditions (3 GPa, 750-1200°C). Water (7-15 wt %) was added to the starting materials to simulate the effects of external water addition from within the subducting slab. The onset of melting is at 760°C in water-rich experiments; melt becomes abundant by 800°C. In contrast, the onset of melting in published, water-poor experiments occurs at variable temperatures with the production of significant melt fractions being restricted to more than 900°C (phengite-out). The different solidus temperatures (Tsolidus) can be a..View full abstract
Awarded by NERC (Natural Environment Research Council)
Awarded by SNF (Schweizer Nationalfonds) Ambizone Grant
Awarded by Natural Environment Research Council
This project was supported by NERC (Natural Environment Research Council) grant NE/G016615/. We also acknowledge the following sources of support: ERC (European Research Council) Advanced Grant 'CRITMAG' (J.D.B., R.A.B.), Royal Society Wolfson Research Merit Award (J.D.B.), SNF (Schweizer Nationalfonds) Ambizone Grant (PZ00P2_142575) (S.S.).