Carbon dioxide and methane emissions from calcareous-marly rock under stress: experimental tests results
Main Article Content
Abstract
The identified emissions of abiogenic carbon dioxide, carbon monoxide and methane are generally attributed to
volcanic activity or to geochemical processes associated with thermometamorphic effects. In this paper we show
another possible abiogenic source of emission, induced by mechanical, and not thermal, stresses. We investigated
the mechanochemical production of carbon dioxide and methane when friction is applied to marly-type rock
and studied the mechanisms determining the strong CO2 and CH4 emissions observed. A ring mill was used to
apply friction and oriented pressure upon a synthetic calcite-clay mixture of varying proportions. We found that
the CO2 and CH4 release versus the grinding action has a non-linear trend reflecting the behaviour of decreasing
crystallinity, which indicates a close link between crystallinity and gas production. For the CO2 emission, we
propose a release mechanism connected with the friction-induced fractures and the increase in structural disorders
induced by creep in the lattice. The CH4 emission could be explained by a Sabatier reaction in which CO2
and hydrogen are involved to form CH4 and water.
volcanic activity or to geochemical processes associated with thermometamorphic effects. In this paper we show
another possible abiogenic source of emission, induced by mechanical, and not thermal, stresses. We investigated
the mechanochemical production of carbon dioxide and methane when friction is applied to marly-type rock
and studied the mechanisms determining the strong CO2 and CH4 emissions observed. A ring mill was used to
apply friction and oriented pressure upon a synthetic calcite-clay mixture of varying proportions. We found that
the CO2 and CH4 release versus the grinding action has a non-linear trend reflecting the behaviour of decreasing
crystallinity, which indicates a close link between crystallinity and gas production. For the CO2 emission, we
propose a release mechanism connected with the friction-induced fractures and the increase in structural disorders
induced by creep in the lattice. The CH4 emission could be explained by a Sabatier reaction in which CO2
and hydrogen are involved to form CH4 and water.
Article Details
How to Cite
1.
Martinelli G, Plescia P. Carbon dioxide and methane emissions from calcareous-marly rock under stress: experimental tests results. Ann. Geophys. [Internet]. 2005Dec.25 [cited 2023Dec.11];48(1). Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3191
Issue
Section
OLD
Open-Access License
No Permission Required
Istituto Nazionale di Geofisica e Vulcanologia applies the Creative Commons Attribution License (CCAL) to all works we publish.
Under the CCAL, authors retain ownership of the copyright for their article, but authors allow anyone to download, reuse, reprint, modify, distribute, so long as the original authors and source are cited. No permission is required from the authors or the publishers.
In most cases, appropriate attribution can be provided by simply citing the original article.
If the item you plan to reuse is not part of a published article (e.g., a featured issue image), then please indicate the originator of the work, and the volume, issue, and date of the journal in which the item appeared. For any reuse or redistribution of a work, you must also make clear the license terms under which the work was published.
This broad license was developed to facilitate open access to, and free use of, original works of all types. Applying this standard license to your own work will ensure your right to make your work freely and openly available. For queries about the license, please contact ann.geophys@ingv.it.