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Laser heating in diamond anvil cells: Developments in pulsed and continuous techniques
Geophysical Laboratory, Carnegie Institution of Washington.
Geophysical Laboratory, Carnegie Institution of Washington.
Geophysical Laboratory, Carnegie Institution of Washington.
Geophysical Laboratory, Carnegie Institution of Washington.
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2009 (English)In: Journal of Synchrotron Radiation, ISSN 0909-0495, Vol. 16, no 6, 769-772 p.Article in journal (Refereed) Published
Abstract [en]

Developments in continuous and pulsed laser-heating techniques, and finite-element calculations for diamond anvil cell experiments are reported. The methods involve the use of time-resolved (5 ns gated) incandescent light temperature measurements to determine the time dependence of heat fluxes, while near-IR incandescent light temperature measurements allow temperature measurements to as low as 500 K. Further optimization of timing in pulsed laser heating together with sample engineering will provide additional improvements in data collection in very high P-T experiments.

Place, publisher, year, edition, pages
2009. Vol. 16, no 6, 769-772 p.
Keyword [en]
Diamond anvil cell, Laser heating, Pulsed laser, Raman spectroscopy, Thermal conductivity
Identifiers
URN: urn:nbn:se:kth:diva-27015DOI: 10.1107/S0909049509033433ISI: 000271091000012OAI: oai:DiVA.org:kth-27015DiVA: diva2:374378
Note
QC 20101203Available from: 2010-12-03 Created: 2010-12-03 Last updated: 2010-12-03Bibliographically approved
In thesis
1. Experimental investigation of hydrocarbon formation and transformation under Earth´s upper mantle conditions
Open this publication in new window or tab >>Experimental investigation of hydrocarbon formation and transformation under Earth´s upper mantle conditions
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The theory of the abyssal abiotic petroleum origin considers oil and natural gas to begenerated in the Earth’s upper mantle. Hydrocarbons migrate further through the deep faults into the Earth’s crust, where they can form oil and gas deposits in any kind of rock in any kind of structural position. Until recently one of the main obstacles for further development of this theory has been the lack of the data covering processes of generation and transformations of hydrocarbons.

Experimental data, presented in this thesis, confirms the possibility of hydrocarbons formation from mantle inorganic compounds (water, Fe, CaCO3 or graphite) at temperature and pressure of the upper mantle (1500 K and 5 GPa). Experiments were carried out in CONAC high pressure device and multianvil apparatus BARS. Compositions of received gas mixtures were similar to natural gas. Quantity of hydrocarbons depended on the cooling regime of reaction mixture under pressure. Slow cooling favored higher quantity. We found that donor of carbon (CaCO3 or graphite) determines formation of “dry” (methane-rich) gas or “wet” (light hydrocarbons-rich) gas.

Experiments in laser-heated diamond anvil cells showed that methane and ethane partially react under upper mantle thermobaric conditions (2-5 GPa, 1000-1500 K) to form mixture of hydrocarbons: methane, ethane, propane and n-butane – main compounds of natural gas. Similarity of final product mixture obtained from methane and ethane means thermodynamic stability of hydrocarbons in the thermobaric conditions of the upper mantle and equilibrium character of the observed processes.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. iii, 65 p.
Keyword
theory of deep abiotic petroleum origin, natural gas, hydrocarbons, methane, ethane, graphite, hydrogen, high pressure, high temperature, CONAC, BARS, diamond anvil cell, Raman, X-ray, gas chromatography
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-27017 (URN)
Public defence
2010-12-10, Sal F2, Lindstedtsvägen 26, KTH, Stockholm, 10:30 (English)
Opponent
Supervisors
Note
QC 20101203Available from: 2010-12-03 Created: 2010-12-03 Last updated: 2010-12-03Bibliographically approved

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