Structural and fluid evolution of Saraburi Group sedimentary carbonates,central Thailand: A tectonically driven fluid system |
| |
| Institution: | 1. Dept of Geology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand;2. PTTEP, EnCo, Soi 11, GGS, Vibhavadi Rangsit Road, Chatuchak, Bangkok 10900, Thailand;3. School of Geosciences, Monash University, Victoria, Australia;4. Department of Geological Sciences, Chiang Mai University, 239 Huay Kaew Road, Chiang Mai 50200, Thailand;1. Applied Palaeontology and Biostratigraphy Research Unit, Department of Biology, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand;2. Geological Survey Division, Department of Mineral Resources, Rama VI Road, Ratchathewi, Bangkok 10400, Thailand;3. Palaeontological Research and Education Centre, Mahasarakham University, Maha Sarakham 44150, Thailand;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;2. Palaeontological Research and Education Centre, Mahasarakham University, Maha Sarakham 44150, Thailand;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Geology, Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand;2. Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan;3. Department of Geology, University of Johannesburg, Auckland Park 2006, South Africa;4. Department of Geology and Paleontology, National Museum of Nature and Science, Ibaraki 305-0005, Japan;5. Research Program of Toxic Substance Management in the Mining Industry, Center of Excellence on Hazardous Substance Management (HSM) and Research Unit of Site Remediation on Metals Management from Industry and Mining (Site Rem), Environmental Research Institute, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand;1. Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium;2. Statoil Research Center Bergen, Statoil A.S.A., Sandsliveien 90, 5020 Bergen, Norway;3. Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, B-9000 Ghent, Belgium;1. Department of Geosciences, Eberhard Karls University Tübingen, Wilhelmstr. 56, 72074 Tübingen, Germany;2. Departament de Geologia, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain;3. Departament de Petrologia, Geoquímica i Prospecció Geològica, Universitat de Barcelona, 08028 Barcelona, Spain;4. Group of Dynamics of the Lithosphere, Institute of Earth Sciences “Jaume Almera” (CSIC), 08028 Barcelona, Spain;5. ExxonMobil Upstream Research Company, P.O. Box 2189, Houston, TX 77252-2189, USA;1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China;2. College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China;3. China National Offshore Oil Corporation Ltd., Shenzhen 518054, China |
| |
| Abstract: | A stable isotopic study, focused on calcite cements, vein-fill calcite and various bioclasts was conducted on variably deformed and thrusted Lower and Middle Permian carbonates of the Saraburi Group. Samples were collected in quarry faces across 3 areas in the Saraburi–Lopburi region of central Thailand. Stable isotope crossplots (carbon and oxygen), using texture-aware isotope samples, defined variable, but related, fluid-cement histories, which are tied to regional burial and then orogenic overprints driven by the Indosinian (Triassic) orogeny. This was followed by telogenetic overprints, driven by late Cenozoic uplift. The studied carbonates were deposited along the western margin of the Indochina Block, where they were deposited as isolated calcareous algal, sponge and fusilinid-rimmed platforms on highs bound by extensional faults. The platform areas passed laterally and vertically into more siliciclastic dominated sequences, deposited in somewhat deeper waters within probable fault-bound lows. Regional post-depositional mesogenetic fluid-rock re-equilibration of the isotope values in ongoing calcite precipitates occurred until the matrix permeability was occluded via compaction and pressure solution. This regional burial regime was followed by collision of the Indochina and Sibumasu blocks during the Indosinian (Triassic) blocks, which drove a set of structurally focused (thrust-plane related) increasingly warmer set of fluids through the studied sequences. The final diagenetic overprint seen in the isotopic values of the latest calcite cements occurs in a telogenetic (uplift) setting driven by Cenozoic tectonics and isostatic uplift. Integration of isotope data with its structural setting establishes a clear separation in fluid events related to two time-separate tectonic episodes; its fluid chemistry defines the Permo-Triassic closure of the Paleotethys and its subsequent reactivation during the Tertiary collision of India and Asia. The C–O covariant plot fields in the Permian carbonates of central Thailand are so distinct that it is possible to use their signatures to separate burial from meteoric cements in drill cuttings and hence recognise equivalent subsurface unconformities and likely zone of porosity development in possible “buried hill plays in Thailand. |
| |
| Keywords: | Thrust Veins Stable isotopes Indosinian Saraburi Karst |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
