Viscosity of mafic magmas at high pressures

Cochain, B.; Sanloup, C.; Leroy, C.; Kono, Y.

doi:10.1002/2016GL071600

Viscosity of mafic magmas at high pressures

Journal Article · Sat Jan 28 00:00:00 EST 2017 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2016GL071600· OSTI ID:1465342

^[1]; ^[2]; Leroy, C. ^[3]; ^[4]

Sorbonne Univ., Paris and UPMC Univ. Paris (France). Inst. des Sciences de la Terre de Paris; Univ. of Edinburgh, Scotland (United Kingdom). Scottish Univ. Physics Alliance (SUPA), School of Physics and Astronomy; Sorbonne Universités
Sorbonne Univ., Paris and UPMC Univ. Paris (France). Inst. des Sciences de la Terre de Paris
Sorbonne Univ., Paris and UPMC Univ. Paris (France). Inst. de Minéralogie, de Physique des matériaux et de Cosmochimie
Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab., High Pressure Collaborative Access Team (HPCAT)

While it is accepted that silica-rich melts behave anomalously with a decrease of their viscosity at increased pressures (P), the viscosity of silica-poor melts is much less constrained. However, modeling of mantle melts dynamics throughout Earth's history, including the magma ocean era, requires precise knowledge of the viscous properties of silica-poor magmas. We extend here our previous measurements on fayalite melt to natural end-members pyroxenite melts (MgSiO₃ and CaSiO₃) using in situ X-ray radiography up to 8 GPa. For all compositions, viscosity decreases with P, rapidly below 5 GPa and slowly above. The magnitude of the viscosity decrease is larger for pyroxene melts than for fayalite melt and larger for the Ca end-member within pyroxene melts. The anomalous viscosity decrease appears to be a universal behavior for magmas up to 13 GPa, while the P dependence of viscosity beyond this remains to be measured. In conclusion, these results imply that mantle melts are very pervasive at depth.

View Accepted Manuscript (DOE)

Research Organization:: Carnegie Inst. of Washington, Washington, DC (United States)

Sponsoring Organization:: European Research Council (ERC); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357; FG02-99ER45775; NA0001974

OSTI ID:: 1465342

Alternate ID(s):: OSTI ID: 1347014

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 2 Vol. 44; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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