Research List

No.	Researcher	Title	Abstract	Year
461	Than Soe Hlaing	MICROFACIESAND DEPOSITIONAL ENVIRONMENT OF THE THITSIPIN LIMESTONE FORMATION EXPOSED IN THE HTI TA HKAW AREA, TAUNGGYI TOWNSHIP, SOUTHERN SHAN STATE	The Thitsipin Limestone Formation extensively covers the entire Shan State. The present investigated Hti Ta Hkaw area, is situated in Taunggyi Township, southern Shan State. The formation is characterized by thin-bedded to massive, bluish grey to dark grey limestone and dolomitic limestone with abundance of shallow marine fauna. The classification of microfacies is based on the presence and proportion of skeletal and nonskeletal components. Based on the detailed petrographic analysis, nine microfacies have been recognized comprising coral boundstone, bioclasticrudstone, algal packstone-grainstone, fusulinidpackstone, peloidalpackstone, intraclasticwackestone-packstone, foraminifer wackestone, lime mudstoneand dolomitic lime mudstone. On the basis of the observed microfacies types, the Thitsipin Limestone Formation would have been deposited in the rimmed platform condition under sub-environments of intertidal, subtidal channel lag, subtidal lagoon, back reef lagoon and open marine environment during the Middle Permian time.	2019
462	Yin Min Htwe	SILURIAN ROCKS IN THE KYAUKTAP AREA, SHAN STATE (SOUTH): THEIR SEDIMENTATION STYLE AND DEPOSITIONAL PROCESSES	The Silurian rocks in the Kyauktap area comprise seven distinct lithofacies, namely, flat laminated limestone, thin-bedded limestone interbedded with calcareous siltstone, purple phacoidal limestone, whitish grey shale and limestone interbedded unit, medium to thick-bedded limestone interbedded with argillaceous layers, grey phacoidal limestone and Kyauktap graptolite shale. There are nine carbonate microfacies in the Nyaunglwe section, ten microfacies in the Hle Lan section and nine microfacies in the Kyauktap phacoidal section. They are bioclastic rudstone, intraclastic bioclastic packstone, ostracod packstone, ferruginous ostracod packstone, bioclastic wackestone, argillaceous bioclastic wackestone, ferruginous bioclastic wackestone, argillaceous ostracod wackestone, nodular bioclastic wackestone, calcisphere bioclastic wackestone, dolomitized bioclastic wackestone, argillaceous limemudstone, limonitic limemudstone and ferruginous limemudstone. Nyaunglwe section is carbonate dominated unit and Hle Lan section is composed of whitish grey shale and argillaceous limestones in which bioturbated horizons are very common. Kyauktap phacoidal section is entirely grey nodular limestones and it grades into graptolite-bearing grey shales in the southern part of the area. Vertical and lateral variations of the lithofacies and microfacies suggest that the entire Silurian sequence represents a depositional continuum of shallow subtidal, deeper subtidal and slope.	2019
463	Khaing Khaing San	STRATIGRAPHIC PALEONTOLOGY OF THE MIDDLE DEVONIAN UNIT IN HSIPAW AREA, NORTHERN SHAN STATE	The next occurrence of the Middle Devonian Unit which is the equivalent unit of the Pwepon Limestone in Pyinoolwin Township, recognized in the Maymyo Formation, Hsipaw area, northern Shan State. It exposed as an isolated outcrops of only one soil-covered hill which is now seeing as road-cut section near Kontha village. Primary petrographic study indicate that the limestone varies essentially medium- to coarse, locally argillaceous, calcilutite with abundant biogenic debris in the middle part and an intraclastic biogenic calcilutite with fine- to medium-grained in the lower and upper parts. Microstylolites with iron stained argillaceous concentrations and brecciation are developed in places. The fossiliferous unit is laterally passed into dolomite or dolomitic limestone which is regarded as the sandwiched unit of the MaymyoFormation. Initial fossil studies have led to the recognition of rugose, tabulate and brachiopods faunal assemblages. These are solitary rugose corals of Temnophyllum, Grypophyllum, Macgeea, Cyathophyllum, Acanthophyllum, Dohmophyllum and abundant colonial rugose corals of Argutastrea; tabulate corals of Alveolites, Coenites, Favosites and brachiopods of Spinatrypa, Atrypa, Desquamatia, Strophomena, Reticulariopsis, Athyris and Xystrostrophia. This coral assemblage is quite similar to Pwepon Limestone but this unit is more argillaceous, fossiliferous, more abundant brachiopods and corals attain larger size. This unit is not previously described in Hsipaw area.	2019
464	Zar Ni Swe	PERMIAN UNIT EXPOSED IN THE HOPANG AREA, WA SELF-ADMINISTERED DIVISION, NORTHERN SHAN STATE, MYANMAR	The investigated area is situated in Hopang Township, Wa Self-Administered Division, northern Shan State, Myanmar. The Plateau Limestone of the study area mainly consisted of medium-to thick-bedded, light grey to grey limestone. Most fossils found are fragmentary; complete fossils are rare or absent. The lithology is not much changed except fossils become more complete than the lower. They contain crinoid stems and unidentifiable shells of gastropod, fragments of bryozoan, Syringopora, and solitary corals. It is followed by medium-bedded limestone with more fossil fragments appear in the fusuline horizon composed of gastropods, crinoid stems, corals and a small number of chert nodules. The abundant Cancellina species were found in the Hopang limestone. The associating genera include Pseudofusulina, Parafusulina, Nankinella and Toriyamaia. The dominance of Cancellina and absence of both Misellina and Neoschwagerina indicate a Kubergandian (Late Kungurian) age.	2019
465	Aung Tay Zar	CHARACTERISTICS OF GOLD DEPOSITS FROM MOGOK BELT: CASE STUDIES ON ZAYETKWIN-KWINTHONSE AND PHAYAUNG TAUNG AREAS, MANDALAY REGION, MYANMAR	Mogok Belt is the one of metallogenic province in Myanmar. This belt has two sub-belts such as Mogok Metamorphic Belt and Slate Belt. Along these two sub-belts, gold deposits are difference characteristics and features. Zayetkwin-Kwinthonse gold deposit from Mogok Metamorphic Belt is mainly hosted in marble unit as fracture-filling vein with silicification, sericitization and propylitization alteration. Gold occurs in quartz vein as disseminated specks in pyrite, sphalerite and galena. The diagnostic quartz vein textures, coexistence of vapor-rich and liquid-rich fluid inclusions and the presence of adularia and calcite in the vein mineralogy are distinct characteristics features. In place, fluid inclusion homogenization temperature �Th� and salinity from Zayetkwin-Kwinthonse deposit are 159-315�C and 0.88-12.51 wt%NaCl equivalent respectively. Alternatively, Phayaung Taung gold deposit from Slate Belt is hosted in phyllite, schist and quartzite. The mineralization is associated with stockwork quartz vein system. Wall-rocks silicic alteration by cryptocrystalline quartz or amorphous silica is dominant; phyllic alteration is expressed by sericite, quartz, chlorite and pyrite with disseminated hematite. Gold occurs as small spots in tourmaline-quartz vein and sulfide bearing quartz vein. It is associated with pyrite and chalcopyrite as well as Au-Ag-Bi-Te ore assemblages. Fluid inclusion homogenization �Th� in quartz fall within the range of 234-426�C and salinities ranging from 0.35-8.41 wt%NaCl equivalent. In fact, Zayetkwin-Kwinthonse gold deposit represents the epithermal expression whereas Phayaung Taung gold deposit shows typical mesothermal characters.	2019
466	Khin Thuzar Min	PETROGRAPHY AND PETROGENESIS OF METAMORPHIC ROCKS EXPOSED AT MOGAUNGGYI AREA, SINGU TOWNSHIP, MANDALAY REGION	The Mogaunggyi area is situated in Singu Township, Mandalay Region and forms the southern continuation of highly deformed Mogok Metamorphic Belt. Based on the petrological, mineralogical and field criteria, metamorphic rocks in the study area comprise metapelites (garnet - biotite gneiss), metacarbonate (varieties of marbles and calc-silicates) and skarn. There are two main types of metamorphism affecting in this area; regional metamorphism and contact metamorphism. The metamorphic mineral such as sillimanite, garnet, diopside and forsterite, phlogopite and spinel are the evidence of regional metamorphism and belongs to the almandineamphibolite facies with 0.4-0.8GPa and 550?C to 750?C estimated pressure and temperature respectively. The regional metamorphism was later superimposed by contact metamorphism by the intrusions of granite, biotitemicrogranite and pegmatite. Hence, the skarn rocks occurred at the marginal part. They belong to the pyroxene-hornfelsfacies and estimated pressure and temperature are between 0.1-0.2GPa and 600?C - 700?C respectively. The protolith age of the metamorphic rocks in the study area may range from Precambrian to Late Paleozoic, and the time of metamorphism of the study area is suggested to be from Oligocene to Middle Miocene.	2019
467	Ohnmar Soe Yin	PERMIAN BIOTIC ASSOCIATION FROM THE MOULMEIN LIMESTONE IN PAWTAW TAUNG, HPA-AN TOWNSHIP, KAYIN STATE	The prominent rock unit, the Moulmein Limestone is well exposed in the Pawtaw Taung which is located in the northeastern part of Hpa-an Township, Kayin State. The present study recovered the coral-brachiopod-foraminifer association for the first time from the fossiliferous limestone of the Pawtaw Taung. The Middle Permian coral fauns of solitary rugose coral (Pavastehphyllum sp.) and compound rugose corals (Polythecalis sp. and Waagenophyllum sp.) are dominated. These corals are typically Tethyan. The occurrence of brachiopod fauna (Retimarginifera sp. Stereochia sp. and Spiriferella sp.) and the fusuline fauna ( Parafusulina sp., Eopolydiexodina sp. and Yangchienia sp.) are regarded as an indicative of the transitional biotic province of Shan-Thai Terrane. From the paleobiogeographical point of view, it is assumed that the coral-brachiopod-foraminifer association of the Moulmein Limestone, including the present study area, represents the western part of Sibumasu Block, as a whole, are treated as a mixed transitional fauna (Gondwanan and Cathaysian fauna affinities) which flourished in warm temperate conditions during Middle Permian time.	2019
468	Aung Kyaw Myat	STUDY ON SPELEOTHEMS FROM GEOHERITAGE SITES OF THE LIMESTONE CAVES AT THE HPA-AN TOWNSHIP, KAYIN STATE, MYANMAR	The research area is located at the vicinity of the Hpa-an Township, Kayin State, Myanmar. In Hpa-an area, there are so many historical limestone caves with beautiful speleothem, such as Ba-yint-nyi cave, Ya-thae-pyan cave, Kawtgon cave, Sadan cave, Wa�-byan cave, Hlaing-kawt-pya cave, Kawt-ka-thaung cave, Badom cave, Linno cave and Thayar-shwe cave. Among them, Ba-yint-nyi cave, Ya-thae-pyan cave, Kawtgon cave, Sadan cave and Linno cave are distinct and famous for tourism. These limestones caves are composed of micritic limestone, dolomitic limestone and brecciated limestone of the Moulmein Limestone Formation (Permian in age). According to morphology of speleothems by Hill and Forti (1997), at least 17 kinds of speleothems can be classified as the cave deposits of Ba-yint-nyi cave, Ya-thae-pyan cave, Kawtgon cave, Sadan cave and Linno cave in this study. All of the speleothems formations are mainly controlled by the five hydrological mechanisms such as dripping, flowing, seeping, pooled water and splashing water. Thermogene travertines form from carbon dioxide sources which receive most of their carrier CO2 from thermally-driven processes in this area because of the sub-tropical climate condition. The preservations of these beautiful limestone caves are important for geotourism as geoheritage sites. Moreover, these caves act natural ornaments for our country.	2019
469	Aye Aye Han	MICROFACIES ANALYSIS OF SILURIAN CARBONATE ROCKS IN THE AREA BETWEEN YATSAWK AND BAWSAING, SHAN STATE (SOUTH)	Carbonate microfacies analysis was systematically carried out focusing on the sedimentological characters for the rock units exposed in the area between Yatsawk and Bawsaing, Yatsawk township, Shan state (south), Myanmar. It lies between latitude 21� 03' N and 21� 07'N, longitude 96� 45' E and 96� 55'E, representing one inch topographic map index of 93 C/16. Most of the exposed rock units are limestone and dolomite with different lithologic characters in different geological age, with minor amount of clastic rocks. Detailed sedimentological analysis and interpretations are carried out for the Linwe Formation. It consists of purple, pink and grey, medium to thick bedded phacoidal limestones, fine-grained, poorly jointed, wavy and discontinuous laminated, argillaceous limestone, bluish-grey calcareous shale and calcareous mudstone. Based on the partical component, texture and sedimentary structure six microfacies such as lime mudstone, bioclastic lime mudstone, biointraclastic wackestone, bioclastic wackestone, bioclastic lithoclasticpackstone and bioclastic packstone are recognized. By the microfacies analysis, Linwe Formation can be subdivided into four different facies associations falling into four main depositional environments, namely, foreslope, open sea shelf, deep shelf margin and basin by identifying their grain type, physical, biologic and sedimentary structures.	2019
470	Thida Than	LITHOFACIES AND DEPOSITIONAL ENVIRONMENT OF OKHMINTAUNG FORMATION IN KYUNCHAUNG AREA, PAKOKKU DISTRICT, MAGWAY REGION, MYANMAR	The Kyun Chaung area is situated in Pakokku District, Magway Region in Central Myanmar. The study area is composed essentially of Cenozoic rock sequences of Lower Pegu Group (Oligocene � Miocene) and Irrawaddy Formation. The rock sequences of the Lower Pegu Group are Padaung Formation, Okhmintaung Formation, (Lower-Upper Oligocene). The detailed petrographic analysis is carried out for the sandstones of the Padaung and the Okhmintaung Formation to obtain the modal compositions of the rock units, diagenetic imprints and provenance study. From the petrographic analysis, sandstones of the Okhmintaung Formations can be regarded as lithic arkose in composition. According to the lithofacies analysis, at least five different lithofacies type can be recognized in Okhmintaung Formation. They are Sand-Mud interlayer facies, Bluish Grey Shale facies, Bioturbated Sandstone facies, Fossiliferous Sandstone facies, and Ripple Sandstone facies. The depositional pattern of Okhmintaung Formation shows a typical cyclic sedimentation pattern occurred in near shore environment. The main economic interest of the KyunChaung area is petroleum extraction from reservoir.	2019

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