Middle Eocene low-paleolatitude radiolarian evidence for the Cabog Formation,Central East Luzon,Philippine Mobile Belt |
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| Authors: | Keisuke Ishida Shigeyuki Suzuki Graciano P Yumul Carla B Dimalanta |
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| Institution: | 2. Geography, Geology and the Environment, Keele University, Staffordshire, United Kingdom;1. The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012 China;2. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301 China;1. Department of Chemistry, Mar Thoma College, Tiruvalla, Kerala, India;2. Apollo Tyres, Vadodhara, Gujarat, India;3. Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Kochi, Kerala, India;4. School of Chemical Sciences, Mahatma Gandhi University, Priyadarsini Hills, Kottayam, Kerala, India;5. International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Priyadarsini Hills, Kottayam, Kerala, India;1. Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan;2. Department of Earth Science and Resources, China University of Geosciences, Beijing, 100083, China;3. Faculty of Science, Niigata University, Niigata, 950-2181, Japan |
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| Abstract: | The Cabog Formation, newly established herein and exposed in central East Luzon, Philippine Mobile Belt, is defined in age by the occurrence of radiolarians. The radiolarian assemblage is correlative with the middle Eocene and suggests a low paleolatitude affinity. The correlation, sedimentary environment, and the tectonic significance are discussed. The Cabog Formation is correlative with the distal part of the middle–late Eocene Caraballo Formation, which is exposed in the northeastern side of the Philippine Fault Zone. The sandstone composition and radiolarian age suggest that the Cabog Formation represents the first depositional stage in the early arc setting. The northward migration of the formation is also estimated in relation with the Philippine Sea Plate motion along the Older Philippine Fault from the equatorial area. |
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