Details
| Original language | English |
|---|---|
| Article number | 3852 |
| Journal | Scientific Reports |
| Volume | 9 |
| Issue number | 1 |
| Early online date | 7 Mar 2019 |
| Publication status | E-pub ahead of print - 7 Mar 2019 |
Abstract
Magnetite (Fe 3 O 4 ) is an iron ore mineral that is globally mined especially for steel production. It is denser (5.15 g/cm 3 ) than Earth’s crust (~2.7 g/cm 3 ) and is expected to accumulate at the bottom of melt-rich magma reservoirs. However, recent studies revealed heterogeneous fluid bubble nucleation on oxide minerals such as magnetite during fluid degassing in volcanic systems. To test if the attachment on fluid bubbles is strong enough to efficiently float magnetite in silicate magma, decompression experiments were conducted at geologically relevant magmatic conditions with subsequent annealing to simulate re-equilibration after decompression. The results demonstrate that magnetite-bubble pairs do ascend in silicate melt, accumulating in an upper layer that grows during re-equilibration. This outcome contradicts the paradigm that magnetite must settle gravitationally in silicate melt.
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In: Scientific Reports, Vol. 9, No. 1, 3852, 07.03.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Accumulation of magnetite by flotation on bubbles during decompression of silicate magma
AU - Knipping, Jaayke L.
AU - Webster, James D.
AU - Simon, Adam C.
AU - Holtz, François
N1 - Funding Information: The work was funded by a PhD fellowship from Studienstiftung des Deutschen Volkes, SEG Student Research Grant and the Annette Kade Fellowship to J.L.K. Experimental and analytical facilities were supported by NSF grant NSF EAR 1559416 to J.D.W. and DFG grant KO1723/20 to the Leibniz Universität Hannover. Julian Feige (Hannover) is thanked for preparation of IR-sections.
PY - 2019/3/7
Y1 - 2019/3/7
N2 - Magnetite (Fe 3 O 4 ) is an iron ore mineral that is globally mined especially for steel production. It is denser (5.15 g/cm 3 ) than Earth’s crust (~2.7 g/cm 3 ) and is expected to accumulate at the bottom of melt-rich magma reservoirs. However, recent studies revealed heterogeneous fluid bubble nucleation on oxide minerals such as magnetite during fluid degassing in volcanic systems. To test if the attachment on fluid bubbles is strong enough to efficiently float magnetite in silicate magma, decompression experiments were conducted at geologically relevant magmatic conditions with subsequent annealing to simulate re-equilibration after decompression. The results demonstrate that magnetite-bubble pairs do ascend in silicate melt, accumulating in an upper layer that grows during re-equilibration. This outcome contradicts the paradigm that magnetite must settle gravitationally in silicate melt.
AB - Magnetite (Fe 3 O 4 ) is an iron ore mineral that is globally mined especially for steel production. It is denser (5.15 g/cm 3 ) than Earth’s crust (~2.7 g/cm 3 ) and is expected to accumulate at the bottom of melt-rich magma reservoirs. However, recent studies revealed heterogeneous fluid bubble nucleation on oxide minerals such as magnetite during fluid degassing in volcanic systems. To test if the attachment on fluid bubbles is strong enough to efficiently float magnetite in silicate magma, decompression experiments were conducted at geologically relevant magmatic conditions with subsequent annealing to simulate re-equilibration after decompression. The results demonstrate that magnetite-bubble pairs do ascend in silicate melt, accumulating in an upper layer that grows during re-equilibration. This outcome contradicts the paradigm that magnetite must settle gravitationally in silicate melt.
UR - http://www.scopus.com/inward/record.url?scp=85062613535&partnerID=8YFLogxK
U2 - 10.1038/s41598-019-40376-1
DO - 10.1038/s41598-019-40376-1
M3 - Article
C2 - 30846740
AN - SCOPUS:85062613535
VL - 9
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 3852
ER -