Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic
Abstract The Late Cretaceous Pandan Formation in Cebu Island is one of the oldest sedimentary units in the Central Philippines. The inconsistencies in geological descriptions and interpretation of the depositional environment of the Pandan Formation complicated efforts to determine the origin and te...
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| Format: | Article |
| Language: | English |
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Wiley
2020-06-01
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| Series: | The Depositional Record |
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| Online Access: | https://doi.org/10.1002/dep2.103 |
| _version_ | 1818487227185889280 |
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| author | Jerali D. Rodrigo Jillian Aira S. Gabo‐Ratio Karlo L. Queaño Allan Gil S. Fernando Leopoldo P. deSilva Jr Kotaro Yonezu Yu Zhang |
| author_facet | Jerali D. Rodrigo Jillian Aira S. Gabo‐Ratio Karlo L. Queaño Allan Gil S. Fernando Leopoldo P. deSilva Jr Kotaro Yonezu Yu Zhang |
| author_sort | Jerali D. Rodrigo |
| collection | DOAJ |
| description | Abstract The Late Cretaceous Pandan Formation in Cebu Island is one of the oldest sedimentary units in the Central Philippines. The inconsistencies in geological descriptions and interpretation of the depositional environment of the Pandan Formation complicated efforts to determine the origin and tectonic history of the basement of Cebu Island. This study therefore looks into the petrological and geochemical characteristics of the Pandan Formation and their implications for the tectonic development of the Philippine Arc during the late Mesozoic. Petrographic analyses indicate significant contribution from mafic sources with additional inputs from felsic rocks, siliciclastics and metamorphic sources. Enrichment of detrital quartz from felsic volcanic and plutonic rocks, as well as from siliciclastic and metamorphic sources, has shifted the SiO2 composition of the Pandan clastics from a mafic to a more intermediate source. Whole‐rock geochemical analyses revealed low SiO2/Al2O3 = 4.21, low K2O/Na2O = 1.16, low Th/Sc = 0.13, low Th/U = 2.78, high La/Th = 4.51, significantly low REEs = ca 76.45 ppm and low LaN/YbN = 4.28. A slight negative chondrite‐normalized Eu/Eu* (0.91) anomaly and significantly high PAAS‐normalized positive Eu/Eu* (1.39) values are consistent with derivation from a young undissected magmatic arc terrane. Tectonic discrimination diagrams suggest formation in an oceanic island arc to active margin/collision zone modelled to be located at the oceanic leading edge of Australia. Rapid uplift and erosion of the magmatic arc and older allochthonous blocks gave way to the rapid deposition of the Pandan Formation in the Late Cretaceous at the subequatorial region. |
| first_indexed | 2024-12-10T16:35:04Z |
| format | Article |
| id | doaj.art-7113c999697443ec820da71c0f400aef |
| institution | Directory Open Access Journal |
| issn | 2055-4877 |
| language | English |
| last_indexed | 2024-12-10T16:35:04Z |
| publishDate | 2020-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Depositional Record |
| spelling | doaj.art-7113c999697443ec820da71c0f400aef2022-12-22T01:41:26ZengWileyThe Depositional Record2055-48772020-06-016230933010.1002/dep2.103Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the MesozoicJerali D. Rodrigo0Jillian Aira S. Gabo‐Ratio1Karlo L. Queaño2Allan Gil S. Fernando3Leopoldo P. deSilva Jr4Kotaro Yonezu5Yu Zhang6Department of Environment and Natural Resources Mines and Geosciences Bureau, Region VII Mandaue City PhilippinesRushurgent Working Group National Institute of Geological Sciences College of Science University of the Philippines Quezon City PhilippinesDepartment of Environmental Science School of Science and Engineering Ateneo De Manila University Quezon City PhilippinesNannoworks Laboratory National Institute of Geological Sciences College of Science University of the Philippines Quezon City PhilippinesNational Institute of Geological Sciences College of Science University of the Philippines Quezon City PhilippinesDepartment of Earth Resources Engineering Kyushu University Fukuoka JapanSchool of Geosciences and Info‐Physics Central South University Changsha ChinaAbstract The Late Cretaceous Pandan Formation in Cebu Island is one of the oldest sedimentary units in the Central Philippines. The inconsistencies in geological descriptions and interpretation of the depositional environment of the Pandan Formation complicated efforts to determine the origin and tectonic history of the basement of Cebu Island. This study therefore looks into the petrological and geochemical characteristics of the Pandan Formation and their implications for the tectonic development of the Philippine Arc during the late Mesozoic. Petrographic analyses indicate significant contribution from mafic sources with additional inputs from felsic rocks, siliciclastics and metamorphic sources. Enrichment of detrital quartz from felsic volcanic and plutonic rocks, as well as from siliciclastic and metamorphic sources, has shifted the SiO2 composition of the Pandan clastics from a mafic to a more intermediate source. Whole‐rock geochemical analyses revealed low SiO2/Al2O3 = 4.21, low K2O/Na2O = 1.16, low Th/Sc = 0.13, low Th/U = 2.78, high La/Th = 4.51, significantly low REEs = ca 76.45 ppm and low LaN/YbN = 4.28. A slight negative chondrite‐normalized Eu/Eu* (0.91) anomaly and significantly high PAAS‐normalized positive Eu/Eu* (1.39) values are consistent with derivation from a young undissected magmatic arc terrane. Tectonic discrimination diagrams suggest formation in an oceanic island arc to active margin/collision zone modelled to be located at the oceanic leading edge of Australia. Rapid uplift and erosion of the magmatic arc and older allochthonous blocks gave way to the rapid deposition of the Pandan Formation in the Late Cretaceous at the subequatorial region.https://doi.org/10.1002/dep2.103Australian Plate marginMesozoicprovenancewhole‐rock and trace element geochemistry |
| spellingShingle | Jerali D. Rodrigo Jillian Aira S. Gabo‐Ratio Karlo L. Queaño Allan Gil S. Fernando Leopoldo P. deSilva Jr Kotaro Yonezu Yu Zhang Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic The Depositional Record Australian Plate margin Mesozoic provenance whole‐rock and trace element geochemistry |
| title | Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic |
| title_full | Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic |
| title_fullStr | Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic |
| title_full_unstemmed | Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic |
| title_short | Geochemistry of the Late Cretaceous Pandan Formation in Cebu Island, Central Philippines: Sediment contributions from the Australian plate margin during the Mesozoic |
| title_sort | geochemistry of the late cretaceous pandan formation in cebu island central philippines sediment contributions from the australian plate margin during the mesozoic |
| topic | Australian Plate margin Mesozoic provenance whole‐rock and trace element geochemistry |
| url | https://doi.org/10.1002/dep2.103 |
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