A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot
On the basis of a combined larger benthic foraminifera, nannofossil and strontium isotope dating programme we confidently re-assign muddy carbonate deposits from the Lower Kinabatangan River Area of Borneo to the Oligocene rather than the Early Miocene. High-diversity, coral-rich (> 50 species) d...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Elsevier Science BV
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/37063 |
| _version_ | 1848754943888982016 |
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| author | McMonagle, L. Lunt, P. Wilson, Moyra Johnson, K. Manning, C. Young, J. |
| author_facet | McMonagle, L. Lunt, P. Wilson, Moyra Johnson, K. Manning, C. Young, J. |
| author_sort | McMonagle, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | On the basis of a combined larger benthic foraminifera, nannofossil and strontium isotope dating programme we confidently re-assign muddy carbonate deposits from the Lower Kinabatangan River Area of Borneo to the Oligocene rather than the Early Miocene. High-diversity, coral-rich (> 50 species) deposits are here tightly constrained to predominately at, or just after, the Early to Late Oligocene boundary (Larger benthic foraminifera zone — Te1, Nannofossil zone — NP24, Sr isotope ages — 28.8–27.6 Ma). This new dating potentially pushes back the start of the Indo-West Pacific Centre of Marine Diversity, at least for corals, about 5 million years earlier than previous data indicated. Our new data supports maintaining separation of the muddy carbonates (previously defined as the Lower Kinabatangan Limestones: Haile & Wong, 1965) from nearby crystalline limestones of the Gomantong Limestone Formation dated here as Early Miocene (Larger benthic foraminifera zone — Te5/earliest Tf1, Sr isotope age — 21.0 Ma).This apparently punctuated development of shallow marine carbonates is seen at several locations in northern Borneo; an area underlain by oceanic crust and long dominated by very deep marine sedimentation (Hutchison, 2005). The opportunistic formation of clastic-influenced coastal and isolated biohermal carbonates is both an important palaeontological data point and a geological marker of changing basin settings. The new data on the first shallow marine deposits in a long established deep marine location, and evidence for unconformities, has important implications for the regional tectonic model, in an area of hydrocarbon exploration. |
| first_indexed | 2025-11-14T08:48:27Z |
| format | Journal Article |
| id | curtin-20.500.11937-37063 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:48:27Z |
| publishDate | 2011 |
| publisher | Elsevier Science BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-370632017-09-13T15:52:26Z A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot McMonagle, L. Lunt, P. Wilson, Moyra Johnson, K. Manning, C. Young, J. Strontium isotope stratigraphy Foraminifera Dating Nannofossils Corals Indo-Pacific Centre of Marine Biodiversity SE Asia Miocene Oligocene On the basis of a combined larger benthic foraminifera, nannofossil and strontium isotope dating programme we confidently re-assign muddy carbonate deposits from the Lower Kinabatangan River Area of Borneo to the Oligocene rather than the Early Miocene. High-diversity, coral-rich (> 50 species) deposits are here tightly constrained to predominately at, or just after, the Early to Late Oligocene boundary (Larger benthic foraminifera zone — Te1, Nannofossil zone — NP24, Sr isotope ages — 28.8–27.6 Ma). This new dating potentially pushes back the start of the Indo-West Pacific Centre of Marine Diversity, at least for corals, about 5 million years earlier than previous data indicated. Our new data supports maintaining separation of the muddy carbonates (previously defined as the Lower Kinabatangan Limestones: Haile & Wong, 1965) from nearby crystalline limestones of the Gomantong Limestone Formation dated here as Early Miocene (Larger benthic foraminifera zone — Te5/earliest Tf1, Sr isotope age — 21.0 Ma).This apparently punctuated development of shallow marine carbonates is seen at several locations in northern Borneo; an area underlain by oceanic crust and long dominated by very deep marine sedimentation (Hutchison, 2005). The opportunistic formation of clastic-influenced coastal and isolated biohermal carbonates is both an important palaeontological data point and a geological marker of changing basin settings. The new data on the first shallow marine deposits in a long established deep marine location, and evidence for unconformities, has important implications for the regional tectonic model, in an area of hydrocarbon exploration. 2011 Journal Article http://hdl.handle.net/20.500.11937/37063 10.1016/j.palaeo.2011.02.009 Elsevier Science BV restricted |
| spellingShingle | Strontium isotope stratigraphy Foraminifera Dating Nannofossils Corals Indo-Pacific Centre of Marine Biodiversity SE Asia Miocene Oligocene McMonagle, L. Lunt, P. Wilson, Moyra Johnson, K. Manning, C. Young, J. A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot |
| title | A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot |
| title_full | A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot |
| title_fullStr | A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot |
| title_full_unstemmed | A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot |
| title_short | A re-assessment of age dating of fossiliferous limestones in eastern Sabah, Borneo: Implications for understanding the origins of the Indo-Pacific marine biodiversity hotspot |
| title_sort | re-assessment of age dating of fossiliferous limestones in eastern sabah, borneo: implications for understanding the origins of the indo-pacific marine biodiversity hotspot |
| topic | Strontium isotope stratigraphy Foraminifera Dating Nannofossils Corals Indo-Pacific Centre of Marine Biodiversity SE Asia Miocene Oligocene |
| url | http://hdl.handle.net/20.500.11937/37063 |