Middle Jurassic radiolarian chert,Indarung, Padang District,and its implications for the tectonic evolution of western Sumatra,Indonesia |
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| Institution: | 1. Southeast Asia Research Group, Geology Department, Royal Holloway, University of London, Egham, Surrey, TW20 0EX, UK;2. Geology Programme, Faculty of Science and Technology, Universiti Kebangasaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia;3. Geology Division, School of Biological and Molecular Sciences, Oxford Brookes University, Oxford, UK;1. Bozok University, Department of Geological Engineering, 66100, Atatürk Way, Yozgat, Turkey;2. Ankara University, Department of Geological Engineering, 06100, Tandogan, Ankara, Turkey;1. Ramsay Générale de Santé, Hôpital Privé Jacques Cartier, Department of Cardiology and Cardiac Surgery, Massy, France;2. University Hospital of Rangueil, Cardiac Imaging Center, Toulouse, France;1. MTA-MTM-ELTE, Research Group for Paleontology, P.O. Box 137, 1431 Budapest, Hungary;2. Institute of Earth Sciences, Université de Lausanne, Géopolis, 1015 Lausanne, Switzerland;3. Rue de la Combe 55, 1969 Eison, Switzerland;1. Laboratory of Sciences, Naruto University of Education, Takashima, Naruto 772-8502, Japan;2. Laboratory of Geology, Institute of SAS, University of Tokushima, 1-1 Minamijyosanjima, Tokushima 770-8502, Japan;3. Laboratory of Earth Science, Faculty of Education, Ehime University, Matsuyama 790-8577, Japan;4. Tokushima Prefectural Museum, Bunka-no-mori, Tokushima 770-8070, Japan;1. Laboratoire AMIS, UMR 5288 CNRS, Université de Toulouse-III (Paul-Sabatier), France;2. Multidisciplinary Laboratory, International Centre for Theoretical Physics, Trieste, Italy;3. Authority for Research and Conservation of Cultural Heritage (ARCCH), National Museum of Ethiopia, Addis Ababa, Ethiopia;4. Département de Préhistoire, UMR 7194 CNRS, Muséum national d’histoire naturelle, Paris, France;5. Département Géosciences, Université de Poitiers, France |
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| Abstract: | Radiolaria from chert in the Indarung Area belong to the Transhsuum hisuikyoense Zone, indicating an Aalenian, lower Middle Jurassic, age. Carbonate in the area has been dated as Upper Jurassic to Lower Cretaceous from the occurrence of Lovcenipora, and overlying tuff has given a radiometric K/Ar age of 105±3 (Albian, uppermost Lower Cretaceous). The chert and carbonate are probably in tectonic contact, with the chert faulted into the limestone during ENE-directed compression. This comprises one of the best dated occurrences of allochthonous material in Sumatra and confirms the accretion of oceanic material along the Sunda margin during Mid- to Late-Cretaceous times. |
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