Microfacies and Depositional Environment of the Eocene Sawahlunto Coal, Ombilin Basin, Indonesia
Ombilin Basin is well-known as one of the largest coal-producing basins in Indonesia. There is no comprehensive study conducted regarding the relationship between petrographical characteristics and coal properties in the area. The results of the petrographic study on Ombilin coal are domina...
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| Format: | Article |
| Language: | English |
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Union of Iraqi Geologists (UIG)
2022-05-01
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| Series: | Iraqi Geological Journal |
| Online Access: | https://igj-iraq.org/igj/index.php/igj/article/view/782 |
| _version_ | 1817989307003043840 |
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| author | Aulia Patria Ferian Anggara |
| author_facet | Aulia Patria Ferian Anggara |
| author_sort | Aulia Patria |
| collection | DOAJ |
| description | Ombilin Basin is well-known as one of the largest coal-producing basins in Indonesia. There is no comprehensive study conducted regarding the relationship between petrographical characteristics and coal properties in the area. The results of the petrographic study on Ombilin coal are dominated by vitrinite (45.82-72.21 col.%), liptinite (14.91-42.55 vol.%), inertinite (15.19-25.68 vol.%), and mineral matter (0.36-11.45 vol.%) which is mostly dominated by pyrite. Based on the maceral association, Ombilin coal is distinguished into five groups; telovitrinite-rich group, detrovitrinite-rich group, telovitrinite-liptinite-rich group, telovitrinite-inertinite-rich group, and inertinite-rich group. A similar correlation is found between maceral and maceral-precursor abundances in modern tropical peat in Indonesia. The basal section of Ombilin coal is interpreted to be composed of sapric and hemic peat, represented by the detrovitrinite-rich and telovitrinite-liptinite-rich groups, middle section is distinct due to the high content of the telovitrinite-rich and inertinite-rich groups, these groups are derived from fine hemic and hemic peat. The top section is dominated by inertinite-rich and detrovitrinite-rich groups and is typically comprised of fibric peat. Correlation between vertical section and maceral abundances represent the evolution changes from topogenous mire to ombrogenous mire. Coal facies and distribution of critical macerals suggest that the coal is derived from degraded woody plant tissues and marginal aquatic or herbaceous plants. The depositional environment of the precursor plants was deposited in wet forest swamp conditions and exhibited transition from limnic to limno- telmatic environment. |
| first_indexed | 2024-04-14T00:44:36Z |
| format | Article |
| id | doaj.art-afb1ea081f5f4ad98276d84614a77d26 |
| institution | Directory Open Access Journal |
| issn | 2414-6064 2663-8754 |
| language | English |
| last_indexed | 2024-04-14T00:44:36Z |
| publishDate | 2022-05-01 |
| publisher | Union of Iraqi Geologists (UIG) |
| record_format | Article |
| series | Iraqi Geological Journal |
| spelling | doaj.art-afb1ea081f5f4ad98276d84614a77d262022-12-22T02:22:04ZengUnion of Iraqi Geologists (UIG)Iraqi Geological Journal2414-60642663-87542022-05-01551E12814610.46717/igj.55.1E.11Ms-2022-05-27Microfacies and Depositional Environment of the Eocene Sawahlunto Coal, Ombilin Basin, IndonesiaAulia PatriaFerian Anggara Ombilin Basin is well-known as one of the largest coal-producing basins in Indonesia. There is no comprehensive study conducted regarding the relationship between petrographical characteristics and coal properties in the area. The results of the petrographic study on Ombilin coal are dominated by vitrinite (45.82-72.21 col.%), liptinite (14.91-42.55 vol.%), inertinite (15.19-25.68 vol.%), and mineral matter (0.36-11.45 vol.%) which is mostly dominated by pyrite. Based on the maceral association, Ombilin coal is distinguished into five groups; telovitrinite-rich group, detrovitrinite-rich group, telovitrinite-liptinite-rich group, telovitrinite-inertinite-rich group, and inertinite-rich group. A similar correlation is found between maceral and maceral-precursor abundances in modern tropical peat in Indonesia. The basal section of Ombilin coal is interpreted to be composed of sapric and hemic peat, represented by the detrovitrinite-rich and telovitrinite-liptinite-rich groups, middle section is distinct due to the high content of the telovitrinite-rich and inertinite-rich groups, these groups are derived from fine hemic and hemic peat. The top section is dominated by inertinite-rich and detrovitrinite-rich groups and is typically comprised of fibric peat. Correlation between vertical section and maceral abundances represent the evolution changes from topogenous mire to ombrogenous mire. Coal facies and distribution of critical macerals suggest that the coal is derived from degraded woody plant tissues and marginal aquatic or herbaceous plants. The depositional environment of the precursor plants was deposited in wet forest swamp conditions and exhibited transition from limnic to limno- telmatic environment.https://igj-iraq.org/igj/index.php/igj/article/view/782 |
| spellingShingle | Aulia Patria Ferian Anggara Microfacies and Depositional Environment of the Eocene Sawahlunto Coal, Ombilin Basin, Indonesia Iraqi Geological Journal |
| title | Microfacies and Depositional Environment of the Eocene Sawahlunto Coal, Ombilin Basin, Indonesia |
| title_full | Microfacies and Depositional Environment of the Eocene Sawahlunto Coal, Ombilin Basin, Indonesia |
| title_fullStr | Microfacies and Depositional Environment of the Eocene Sawahlunto Coal, Ombilin Basin, Indonesia |
| title_full_unstemmed | Microfacies and Depositional Environment of the Eocene Sawahlunto Coal, Ombilin Basin, Indonesia |
| title_short | Microfacies and Depositional Environment of the Eocene Sawahlunto Coal, Ombilin Basin, Indonesia |
| title_sort | microfacies and depositional environment of the eocene sawahlunto coal ombilin basin indonesia |
| url | https://igj-iraq.org/igj/index.php/igj/article/view/782 |
| work_keys_str_mv | AT auliapatria microfaciesanddepositionalenvironmentoftheeocenesawahluntocoalombilinbasinindonesia AT feriananggara microfaciesanddepositionalenvironmentoftheeocenesawahluntocoalombilinbasinindonesia |