Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa
Dissertation (MSc)--University of Pretoria, 2012.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Published: |
University of Pretoria
2013
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613653483651072 |
|---|---|
| access_status_str | Open Access |
| author2 | Roberts, R.J. (James) |
| author_browse | Roberts, R.J. (James) |
| author_facet | Roberts, R.J. (James) |
| collection | Thesis |
| dc_rights_str_mv | © 2012, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria |
| description | Dissertation (MSc)--University of Pretoria, 2012. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/29300 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:34.197Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/29300 Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa Roberts, R.J. (James) john.bussio@live.com Bussio, John Paul Secunda coal fields Coal quality Dolerite intrusions South africa UCTD Dissertation (MSc)--University of Pretoria, 2012. The coalfields of South Africa contain numerous dolerite intrusions, which are believed to have affected the quality of the surrounding coal by a thermal process, controlled by the size of the magmatic body. Data gathered from a working coalfield in Secunda, South Africa, suggest that the relationship between intrusive sills and coal is complex and factors other than intrusion width must be considered in relation to the contact metamorphic effect. The study area contains multiple dolerite intrusions of Karoo age, separated according to their geometric relationship to the local coal seams. Three intrusions were selected for detailed study. The three dolerite bodies, namely the DO4, DO8 and DO10 dolerites, occur as sills intruded close to the main coal seam of the area. The dolerite sills have identical mineralogy and can only be distinguished through textural variations in thin section. Coal quality data was obtained from Sasol Mining Secunda and used to investigate the presence or absence of a change in coal quality relative to dolerite proximity. Reduction in coal quality was defined using three main proximate analysis values, termed Ash, Volatile content (Vols) and Dry Ash Free Volatile (DAFV) in the coal industry. These parameters were used to determine the extent of any effect deleterious to coal quality induced by the intrusion of the dolerite sills. The resultant investigation showed no correlation between the position and thickness of the dolerites, and a change in coal quality (as measured by proximate analysis). In the absence of a linear relationship between coal quality and dolerite proximity, two processes are proposed to explain the absence of the contact metamorphic effects expected from previous studies: -Dolerite emplacement dynamics may influence the size of the metamorphic aureole produced by an intrusion, and invalidating intrusion size as a measure of thermal output, - Hydrothermal fluids mobilised by the dolerite intrusions, either from the country rock or the intrusion itself may percolate through the coal and act as the metamorphic agent responsible for changing coal quality, by dissolving the volatile components of the coal and transporting them to other locations These two processes are sufficient to explain the lack of a clear “metamorphic effect” related to the dolerite intrusions. Copyright Geology unrestricted 2013-09-07T15:18:19Z 2012-11-12 2013-09-07T15:18:19Z 2012-04-07 2012-11-12 2012-11-07 Dissertation Bussio, JP 2012, Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/29300 > E12/4/57/gm http://hdl.handle.net/2263/29300 http://upetd.up.ac.za/thesis/available/etd-11072012-145352/ © 2012, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria application/pdf University of Pretoria |
| spellingShingle | Secunda coal fields Coal quality Dolerite intrusions South africa UCTD Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa |
| title | Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa |
| title_full | Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa |
| title_fullStr | Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa |
| title_full_unstemmed | Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa |
| title_short | Effect of dolerite intrusions on coal quality in the Secunda coal fields of South Africa |
| title_sort | effect of dolerite intrusions on coal quality in the secunda coal fields of south africa |
| topic | Secunda coal fields Coal quality Dolerite intrusions South africa UCTD |
| url | http://hdl.handle.net/2263/29300 http://upetd.up.ac.za/thesis/available/etd-11072012-145352/ |