Melanie Sieber

PhD Candidate
 +61 435 620 602

Profile

Biography

Master of Science in Geosciences, Germany (Frankfurt)

Master thesis: The age of eclogitisation underneath the Kaapvaal craton - a composite xenolith from Robers Victor

Supervisors: Prof. Dr. G. P. Brey and Dr. H. Höfer

Bachelor of Science in Geosciences, Germany (Frankfurt)

Bachelor thesis: Xenocrystic and magmatic olivines in kimberlites tell a complex story of precipitation, dissolution and renewed crystallisation during magmatic uprise

Supervisors: Prof. Dr. G. P. Brey, Dr. H. M. Seitz

Research

Research interests

Carbonation of serpentinites by slab‑derived C‑O‑H fluids in the forearc region of the mantle wedge

The CO2 content in the atmosphere has a strong influence on climate and has changed dramatically over geological times. The atmospheric CO2 content, however, is partially influenced by a deep carbon cycle, that operates on long timescales of millions to billions of years. In the Earth’s deep carbon cycle, carbon is recycled from the exosphere into the Earth’s mantle via subduction zones and back during volcanism.

In this project we are investigating this deep carbon cycle by studying the interactions of carbon bearing aqueous fluids with peridotites and serpentinites within the forearc region of the mantle wedge. We perform high‑pressure piston cylinder experiments and compare our experimental results with field based observations. This study provides evidences of the effectiveness, timescales and magnitudes of C‑O‑H fluid mediated carbonation of serpentinites and peridotites in the mantle wedge with fundamental implications for CO2 fluxes and reservoirs in the Earth’s mantle.

Supervision

Publications

Henley R.W., Bring F, King P.L., Leys Cl, Ganguly J., Mernagh T., Middleton J., Renggli C.J., Sieber M.J., Troitzsch U., Turner M., 2017, High temperature gas-solid reactions in calc-silicate Cu-Au skarn formation; Ertsberg, Papua Province, Indonesia, Contribution to Mineralogy and Petrology, (acct)

 

Sieber M.J., Hermann J., Yaxley G.M., 2017, An experimental investigation of C-O-H fluid-driven carbonation of serpentinites under forearc conditions, Earth and Planetary Science Letters, submitted

 

Merle R., Amelin Y., Yin QZ., Huysken M., Sanborn M., Nagashima K., Yamashita K., Ireland T., Krot A., Sieber M.J., (in prep), Single chondrule geochronology: Example from Allende mega-chondrule

CONFERECE EXPERIENCE

Sept 2017 Specialist Group in Geochemistry Mineralogy and Petrology (SGGMP) – meeting in Benalla (Australia); Oral-presentation: Carbonation of serpentinites in the forearc region of the mantle wedge – combining results from piston cylinder experiments, thermodynamic modelling and field observations; Sieber MJ., Yaxley GM., Hermann J.

Sept 2016 European Mineralogical Conference in Rimini, Italy; Oral-presentation: Analyses of CO2 fluids from piston cylinder experiments – implications for carbonation of serpentinites in the forearc; Sieber MJ., Yaxley GM., Hermann J.

July 2016 Goldschmidt Conference in Yokohama, Japan; Oral-presentation: Carbonation of serpentinite and spinel-peridotite under forearc conditions – an experimental study; Sieber MJ., Yaxley GM., Hermann J.

June 2015 Deep Carbon Observatory: Carbon from the Mantle to the Surface; Poster Presentation: Experimental demonstration of carbonation of serpentinite by slab derived C‑O‑H fluids – a possible new fore‑arc reservoir for carbon; Sieber MJ., Yaxley GM., Hermann J

Sept 2014 Meeting of the International Mineralogical Association in Johannesburg, South Africa; Poster Presentation: A composite garnet pyroxenite xenolith yields a minimum age of 2.4 Ga for eclogitisation in the Kaapvaal subcratonic mantle; Sieber MJ., Brey GP., Shu Q., Höfer HE.

Aug 2013 Goldschmidt Conference in Florence, Italy; Poster-presentation: The age of eclogitisation underneath the Kaapvaal craton – a composite xenolith from Roberts Victor; Sieber MJ., Brey GP., Seitz HM., Höfer HE.

July 2013 Conference on Raman and Luminescence Spectroscopy in Earth Sciences, Vienna, Austria

Sept 2012 European Mineralogical Conference in Frankfurt am Main, Germany; Poster-presentation: Xenocrystic and magmatic olivines in kimberlites tell a complex story of precipitation, dissolution and renewed crystallisation during magmatic uprise; Sieber MJ., Seitz HM., Brey GP., Höfer HE.

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