首页|Microfacies and palaeoenvironments of late Cisuralian and Guadalupian(Early to Middle Permian)alatoconchid-bearing limestone in Loei fold belt,Indochina Terrane
Microfacies and palaeoenvironments of late Cisuralian and Guadalupian(Early to Middle Permian)alatoconchid-bearing limestone in Loei fold belt,Indochina Terrane
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This study presents the first record of Early Permian alatoconchid bivalves from Thailand,the Erawan section,in the north of Loei fold belt with prolific fusulines in association with gastropods,and bra-chiopods.Fusuline taxa are dominated by Pseudofusulina sp.with Darvasites sp.,Staffella cf.labanalensis,Staffella sp.,Nankinella sp.,Neofusulinella sp.,Schubertella sp.,Pamirina darvasica,Pseudoendothyra sp.and others,indicating an Artinskian age.Fusuline wackestone with common,well-preserved smaller fora-minifers,Pseudovermiporella sp.and ostracods indicates a restricted lagoon environment with low to mod-erate water circulation.These fossils,along with well-preserved,articulated alatoconchids in life-position,suggest the autochthonous nature of the deposits in an intertidal environment.In the central part of the fold belt,the Pak Chong section exhibits intervals of alatoconchid biostromes and coquinites.Carbonate build-ups of the alatoconchid biostromes with gregarious bivalves,in life-position embedded in a micritic wackestone matrix,suggest their preferred life habit and environment.The bivalve coquinites containing packed bivalve shells and fragments,however,indicate a high-energy event.This rock fabric along with common fusuline storm sheets suggests occasional storm events in a restricted,with mod-erate water circulation to open lagoon environment.Fusulines are predominated by staffellids and others including Staffella sphaerica,Staffella sp.,Sphaerulina croatica,Pisolina subsphaerica,Nankinella sp.,Neoschwagerina simplex,Presumatrina sp.,Afghanella sp.and others,indicating a Wordian(Middle Permian)age.In the southern portion of the fold belt along the Thai-Cambodian border,the Khao Taa Ngog section contains limestone with alatoconchid shells with massive rugose corals which formed local carbonate build-ups in high-energy open platform environments.Poorly-sorted bioclasts with common fusuline tests,shell frag-ments and coated grains suggest an open marine,lagoon,back reef environment.The occurrence of a fusuline assemblage including Neoschwagerina sp.,Yabeina sp.,Lepidolina sp.,Codonofusiella sp.,Verbeekina ver-beeki and Chusenella sp.indicates the Capitanian(late Middle Permian)age.
Center of Excellence in Basin Studies and Applied Palaeontology,Palaeontological Research and Education Center,Mahasarakham University,Maha Sarakham 44150,Thailand
Department of Biology,Faculty of Science,Mahasarakham University,Maha Sarakham 44150,Thailand
Department of General Geology and Geotourism,Faculty of Geology,Geophysics and Environmental Protection,AGH University of Krakow,Mickiewicza 30,30-059 Kraków,Poland
Department of Mineral Resources,Ministry of Natural Resources and Environment,Ratchathewi,Bangkok 10400,Thailand
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Mahasarakham UniversityDepartment of Mineral ResourcesDMR's Thailand Fossil Fundcooperation between the IGCP700 Paleozoic carbonate buildups in SE Asia and IGCP710 Western Tethys meets Eastern Tethys projects
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