Development of equatorial delta-front patch reefs during the Neogene, Borneo
Miocene patch reefs formed in turbid waters associatedwith high siliciclastic input at the seaward margin of the equatorial Mahakam Delta in eastern Borneo, SE Asia. Patch reefs were initiated on unstable substrates on localized low-relief bathymetric highs associated with delta-front channels or di...
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| Format: | Journal Article |
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SEPM - Soc Sedimentary Geology
2005
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| Online Access: | http://hdl.handle.net/20.500.11937/31465 |
| _version_ | 1848753387986747392 |
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| author | Wilson, Moyra |
| author_facet | Wilson, Moyra |
| author_sort | Wilson, Moyra |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Miocene patch reefs formed in turbid waters associatedwith high siliciclastic input at the seaward margin of the equatorial Mahakam Delta in eastern Borneo, SE Asia. Patch reefs were initiated on unstable substrates on localized low-relief bathymetric highs associated with delta-front channels or distributary mouthbars in the process of abandonment. Patch reefs developed only in shallow waters, formed low-relief buildups, lacked rigid frameworks, and had gently sloping margins. Although the biodiversity of the patch reefs may be comparable with that of clear-water systems, all the organisms present were adapted to turbid-water areas associated with siliciclastic, and sometimes nutrient, influx. The patch reefs were transient features, and their demise was influenced by increased siliciclastic and nutrient input, perhaps at times associated with deepening. Carbonate production and bioherm or patch-reef development can occur in turbid-water delta-front areas as localized or more regionally extensive units during any phases of eustatic sea level.However, development and preservation of turbid-water carbonates is most likely during relative transgression or perhaps late lowstand periods. This is in contrast with common highstand carbonates from clear-water shelves, where nearly pure carbonates interdigitate with siliciclastics. It is the interplay between factors such as tectonics, eustasy, delta lobe switching, shelf currents, and amount and size fraction of siliciclastic influx that ultimately controlled carbonate development and preservation. |
| first_indexed | 2025-11-14T08:23:43Z |
| format | Journal Article |
| id | curtin-20.500.11937-31465 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:23:43Z |
| publishDate | 2005 |
| publisher | SEPM - Soc Sedimentary Geology |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-314652017-01-30T13:25:35Z Development of equatorial delta-front patch reefs during the Neogene, Borneo Wilson, Moyra Miocene patch reefs formed in turbid waters associatedwith high siliciclastic input at the seaward margin of the equatorial Mahakam Delta in eastern Borneo, SE Asia. Patch reefs were initiated on unstable substrates on localized low-relief bathymetric highs associated with delta-front channels or distributary mouthbars in the process of abandonment. Patch reefs developed only in shallow waters, formed low-relief buildups, lacked rigid frameworks, and had gently sloping margins. Although the biodiversity of the patch reefs may be comparable with that of clear-water systems, all the organisms present were adapted to turbid-water areas associated with siliciclastic, and sometimes nutrient, influx. The patch reefs were transient features, and their demise was influenced by increased siliciclastic and nutrient input, perhaps at times associated with deepening. Carbonate production and bioherm or patch-reef development can occur in turbid-water delta-front areas as localized or more regionally extensive units during any phases of eustatic sea level.However, development and preservation of turbid-water carbonates is most likely during relative transgression or perhaps late lowstand periods. This is in contrast with common highstand carbonates from clear-water shelves, where nearly pure carbonates interdigitate with siliciclastics. It is the interplay between factors such as tectonics, eustasy, delta lobe switching, shelf currents, and amount and size fraction of siliciclastic influx that ultimately controlled carbonate development and preservation. 2005 Journal Article http://hdl.handle.net/20.500.11937/31465 SEPM - Soc Sedimentary Geology restricted |
| spellingShingle | Wilson, Moyra Development of equatorial delta-front patch reefs during the Neogene, Borneo |
| title | Development of equatorial delta-front patch reefs during the Neogene, Borneo |
| title_full | Development of equatorial delta-front patch reefs during the Neogene, Borneo |
| title_fullStr | Development of equatorial delta-front patch reefs during the Neogene, Borneo |
| title_full_unstemmed | Development of equatorial delta-front patch reefs during the Neogene, Borneo |
| title_short | Development of equatorial delta-front patch reefs during the Neogene, Borneo |
| title_sort | development of equatorial delta-front patch reefs during the neogene, borneo |
| url | http://hdl.handle.net/20.500.11937/31465 |