Paleocene-middle Miocene flexural-margin migration of the nonmarine llanos foreland basin of Colombia
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| Natura: | Artículo científico |
| Lingua: | en |
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ECOPETROL S.A.
2007
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| _version_ | 1876471727052029952 |
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| author | German Bayona |
| author_facet | German Bayona |
| contents | Paleocene-middle Miocene flexural-margin migration of the nonmarine llanos foreland basin of Colombia German Bayona Milton Rueda Andrés Reyes-Harker Vladimir Torres Carlos Jaramillo Ingeniería Andes miocene Colombia tectonics paleocene A foreland basin is a dynamic system whose depositional systems migrate in response to changes intectonic uplift patterns, sedimentary filling processes and isostatic rebound of the lithosphere. ThePaleocene-middle Miocene foreland system of the Llanos foothills and Llanos basin of Colombiaincludes regional unconformities, abrupt changes in lithology/stacking patterns and flooding surfaces boundingreservoir and seal units. Here we integrate a systematic biostratigraphic study, stratal architecture andtectonic subsidence analyses, regional seismic profiles, and provenance data to define the diachronism ofsuch surfaces and to document the direction of migration of foreland depozones.In a flexurally-deformed basin, sandstone composition, rates of accommodation and sediment supply varyacross and along the basin. We show how a coeval depositional profile in the Llanos foothills-Llanos forelandbasin consists of litharenites interbedded with mudstones (seal rock, supplied from the orogenic front to thewest) that correlate cratonward with organic-rich mudstones and coal (source rock), and to amalgamatedfluvial-estuarine quartzarenites (reservoir rock, supplied from the craton to the east) adjacent to a subaerialforebulge (unconformity). This system migrated northward and eastward during the Paleocene, westward duringthe early-middle Eocene, and eastward during the Oligocene. In the lower-middle Miocene succession of theLlanos basin, identification of flooding events indicates a westward encroaching of a shallow-water lacustrinesystem that covered an eastward-directed fluvial-deltaic system. A similar process has been documented inother basins in Venezuela and Bolivia, indicating the regional extent of such flooding event may be relatedto the onset of Andean-scale mountain-building processes. 2007 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530303 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.3 Vol.3 |
| format | Artículo científico |
| id | redalyc_46530303 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | ECOPETROL S.A. |
| spellingShingle | Paleocene-middle Miocene flexural-margin migration of the nonmarine llanos foreland basin of Colombia German Bayona Ingeniería Andes miocene Colombia tectonics paleocene Paleocene-middle Miocene flexural-margin migration of the nonmarine llanos foreland basin of Colombia German Bayona Milton Rueda Andrés Reyes-Harker Vladimir Torres Carlos Jaramillo Ingeniería Andes miocene Colombia tectonics paleocene A foreland basin is a dynamic system whose depositional systems migrate in response to changes intectonic uplift patterns, sedimentary filling processes and isostatic rebound of the lithosphere. ThePaleocene-middle Miocene foreland system of the Llanos foothills and Llanos basin of Colombiaincludes regional unconformities, abrupt changes in lithology/stacking patterns and flooding surfaces boundingreservoir and seal units. Here we integrate a systematic biostratigraphic study, stratal architecture andtectonic subsidence analyses, regional seismic profiles, and provenance data to define the diachronism ofsuch surfaces and to document the direction of migration of foreland depozones.In a flexurally-deformed basin, sandstone composition, rates of accommodation and sediment supply varyacross and along the basin. We show how a coeval depositional profile in the Llanos foothills-Llanos forelandbasin consists of litharenites interbedded with mudstones (seal rock, supplied from the orogenic front to thewest) that correlate cratonward with organic-rich mudstones and coal (source rock), and to amalgamatedfluvial-estuarine quartzarenites (reservoir rock, supplied from the craton to the east) adjacent to a subaerialforebulge (unconformity). This system migrated northward and eastward during the Paleocene, westward duringthe early-middle Eocene, and eastward during the Oligocene. In the lower-middle Miocene succession of theLlanos basin, identification of flooding events indicates a westward encroaching of a shallow-water lacustrinesystem that covered an eastward-directed fluvial-deltaic system. A similar process has been documented inother basins in Venezuela and Bolivia, indicating the regional extent of such flooding event may be relatedto the onset of Andean-scale mountain-building processes. 2007 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530303 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.3 Vol.3 |
| title | Paleocene-middle Miocene flexural-margin migration of the nonmarine llanos foreland basin of Colombia |
| topic | Ingeniería Andes miocene Colombia tectonics paleocene |
| url | https://www.redalyc.org/articulo.oa?id=46530303 |