Research List

No.	Researcher	Title	Abstract	Year
1851	Naing Htun Lin	EVOLUTION OF TIDE-DOMINATED ESTUARINE FACIES SYSTEM IN THE OLIGOCENE OKHMINTAUNG FORMATION OF THE MYASAGAING-SHWEMAUNGZUN AREA, THE MINBU SUB-BASIN, CENTRAL MYANMAR	The data obtained from the Oligocene Okhmintaung Formation in the Myasagaing-Shwemaungzun Area, the Minbu Sub-Basin, central Myanmar are observed, and then used to establish the depositional processes and environments, and to reconstruct depositional model of the research area. A total of fourteen lithofacies are recognized, and grouped into four facies associations: tidal channel, tidal sand bar, tidal flat and transgressive shelf. Based on studies of the facies and facies associations, the lower part of the Okhmintaung Formation may mainly be deposited in tidedominated estuarine system, which consist of a combination of tidal channel, tidal sand bar and tidal flat facies associations, and then followed by marine transgressive, resulting in deposition of alternating of transgressive shelf and tidal flat sequences in the upper part of the Okhmintaung Formation.	2021
1852	May Thet Aye	PETROGRAPHY AND GEOCHEMISTRY OF CALC-SILICATE ROCKS EXPOSED IN KANTHA-AUNGTHARYA AREA, THABEIKKYIN TOWNSHIP, MANDALAY REGION	The research area, Kantha-Aungtharya area, lies in Thabeikkyin Township, Mandalay Region. The study area falls within the Mogok Metamorphic Belt, lying between Sagaing fault and Shan scarp. It is located about 6.5 km east of Thabeikkyin and 122 km north of Mandalay. Metasedimentary such as marbles and calc-silicate rocks and igneous rock (such as biotite microgranite) units are prominent in this study area. The relatively high Al2O3 and fairly high values of Fe3+and Fe2+in the calc-silicate rock could be due to (a) impurities containing iron in the sedimentary environment and (b) diffusion of ions from the igneous body. The original material from which the calc-silicates can be formed may be impure dolomitic limestone, marls and limestone.	2021
1853	Khaing Myat Thwin	REPTILIAN REMAINS OF IRRAWADDY FORMATION IN YINSEIK AREA, MAGWAY REGION	Yinseik area occupies Obogon Formation (Middle Miocene) and Irrawaddy Formation (Late Miocene to Early Pleistocene). The dominant lithology of Obogon Formation is an alternation of yellowish brown- to buff-colored, fine to medium-grained, thin-bedded sandstone and light gray to bluish gray clay and shale with fine- to medium-grained sandstone. Irrawaddy Formation is mainly composed of thick bedded to massive, medium to coarse-grained, light gray to light brown, concretionary sandstone with cross stratification in the lower part and massive, medium to coarsegrained, light gray to yellowish brown, gritty to pebbly, incoherent sandstone interbedding with siltstone in upper part. The sediments of Irrawaddy Formation in research area yields the fossilized remains of primate (Khoratpithecus sp), carnivores, Anthracothere (Merycopotamus sp.), tragulid, wild boar (Tetraconodon sp. and Propotamochoerus sp.), bovids, rhinoceros (Rhinoceros sp.), horse (Hipparion sp.), elephant (Stegolophodon sp.) and crocodile (Gavialis sp.) which occur in the sediments of Irrawaddy Formation. The present faunal assemblage suggests the existence of forest/woodland adapted animals in Yinseik area in the geological past. Occurrence of crocodile (Gavialis sp.) and extinct river shark (Glyphis sp.) in this area supports the presence of riverine environment. Present day�s environmental conditions in Central Myanmar are characterized by a subtropical semi?arid climate especially in most parts of Mandalay and Magway Regions. The vegetation of this region is dominated by open shrub lands and grasslands. Therefore, the occurrence of forest dwelling mammals in present area contributes to the implication that the Late Miocene paleoenvironment of Yinseik area was drastically different from the present day�s conditions in central Myanmar.	2021
1854	Naw Chel Phaw	A STUDY ON EVOLUTION OF POROSITY IN SANDSTONE RESERVOIRS OF OKHMINTAUNG FORMATION BETWEEN NGAPE AND YENAMA AREA, MAGWAY REGION	The area under investigation lies in Ngape Township, western part of Minbu, Magway Region. In the study area, the Cretaceous to Pliocene Formations are exposed. The main structure of the study area is monocline. The present research aimed to conduct reservoir potential of Okhmintaung Formation. Stratigraphically, the Okhmintaung Formation (Late Oligocene) is mainly made up of thin- to medium-bedded sandstone with bluish gray shale. Petrographically, the sandstone of Okhmintaung Formation is arkose and lithic arkose.By the facies analysis, in Okhmintaung Formation, from top to bottom, Thick- bedded to massive sandstone facies, sand with gypsum intercalation facies, bioturbated sandstone facies, nodular gray shale facies, and sand-shale alternation facies were observed. By the petrographic texture, porosity, and diagenetic features enhancing or destroying the potential porosity of the sand body are also started in Okhmintaung Formation. Some of the sand bodies do not favor the potential of good reservoir because of the size, textural features and diagenetic imprints. Some of the reservoir cannot regard as medium potential due to the petrographic fabric forming lesser potential. By studying the diagenetic features, some of the Okhmintaung sandstone possesses pore-filling clays and very thin grain coating. These authigenesis can destroy reservoir potential and cannot regard as medium potential due to the petrographic fabric forming lesser potential. The textural features suggest that Okhmintaung sandstones are fair reservoir.	2021
1855	Tint Tint Tun	PETROLOGICAL STUDY OF METAMORPHIC ROCKS EXPOSED IN CHAUNGZON AREA, CHAUNGZON TOWNSHIP, MON STATE	The study area occupies the Chaungzon Township, Mon State. It is situated between Latitude 16? 15? 00? to 16? 30? 00? N and Longitude 97? 30? 00? to 97? 35? 00? E, one-inch topographic map No.94H/11. It covers approximately 6.56 km2 . It is located in the western part of Shan-Tanintharyi block. The area was composed of low to medium grade metamorphic rocks which were intruded by igneous rocks. The metamorphic rocks are garnet-biotite gneiss, graphite-sillimanite-mica schist and calc-silicate rock, quartz-sericite schist and quartzite, banded quartzite and mica schist, micaceous quartzite and quartzite and slate, phyllite and quartzite interbedded. Slaty, phyllitic, schistose, gneissose and granoblastic texture are observed in the area. Mineralogical and textural features indicate that all metamorphic rocks had undergone regional and contact metamorphisms. In general, the grade of metamorphism increases from east to west. On the basis of the mineral assemblages, the metamorphic rocks are greenschist facies, amphibolite facies and hornblende hornfels facies. The relative age of metamorphic rocks was probably Post Carboniferous.	2021
1856	Khin Maung Hla	DEFORMATION CHARACTERS ALONG THE SAGAING FAULT ZONE BETWEEN INDAW AND SINGU TOWNSHIP, CENTRAL MYANMAR	The study area is situated along the dextral Sagaing Fault zone, about 208 km long, between Indaw Township in Sagaing Region and Singu Township in Mandalay Region, in central Myanmar. It is demarcated by Latitude 22� 30? N to 24� 20? N and Longitude 95� 50? E to 96� 10? E. In this area, on the basis of the right stepover (releasing step) pattern; the Sagaing Fault can be subdivided into two segments � the northern Indaw-Peinnegon segment (52 km+) and the southern Peinnegon-Singu segment (156 km). There are four types of structural deformation which are determined from both the mesoscopic and microscopic characters of the oriented samples. These are ductile extensional deformation, brittle-ductile extensional deformation, semibrittle extensional deformation, and brittle extensional deformation. The former three types are especially present in the metamorphic rocks exposed between Chaunggyi and Thabeikkyin, and Katha. The brittle extensional deformation is especially present in the sandstones and conglomerates of Male Formation, Irrawaddy sandstones and Singu basalt along the southern and northern parts of the Sagaing Fault zone in the area. Rock units of the study area show distinctive structural deformation characters related to the progressive deformation processes due to the dextral shearing of the Sagaing Fault.	2021
1857	Hlaing Myo Nwe	GEOCHEMICAL PROPERTIES OF LATERITE AND LATERITIZATION PROCESSES IN HPA-AN TOWNSHIP, KAYIN STATE	The present research is carried out laterite and lateritic soils of the Hpa-an Township, Kayin State. In this area, Taungnyo Formation (Carboniferous to Early Permian), Moulmein Limestone (Middle to Late Permian) are exposed covering with older alluvium (Pleistocene) and younger alluvium (Holocene). Laterite altered from all kind of rocks such as igneous, sedimentary and metamorphic rocks. Geochemical analysis of lateritic soil samples is tested with EDXRF to differentiate the laterite type and lateritization processes. Geochemical study of laterite in Hpa-an area suggest that it is made up of within 24% - 64% of SiO2 , between 16 % and 50 % of Fe2O3 , from 13 % to 27 % of Al2O3. Others oxides such as K2O, MnO and CaO are composed of small amount. Trace elements are shown that S, Sr, Cr, V, Zr Cu, Zn,Y, Nb and Rb. The identification and analysis of laterites were made by Molar Ratio of laterite which is based on the ratios of sesquioxides (Fe2O3 + Al2O3) to silica (SiO2). Molar ratio less than 1.33 is true laterite, between 1.33 and 2 is lateritic soil and greater than 2 is non-lateritic soil. Ternary Diagram is used to explore degree of lateritization. Four stages of alteration are recognized in lateritization process: (i) kaolinitization, (ii) weak lateritization, (iii) moderate lateritization and (iv) strong lateritization. Based on the results, Taunggalay and Myaing-gale areas have less than 1.33 in Molar ratio and moderate lateritization. Vicinity of Hpaan and Ya-The Byan Taung display between 1.33 and 2 in Molar ratio. These areas pronounced lateritic soil and lied in weak lateritization zone. Southern parts of the study area show greater than 2 in Molar ration where it is non-lateritic soil zone and kaolinization stage.	2021
1858	Min Han Nyein	CHEMICAL ANALYSIS OF THE GROUNDWATER IN MAYANGONE TOWNSHIO, YANGON REGION	The research area, Mayangone Township is situated on the Shwedagon-Mingaladon ridge. The topography of the research area is slight moderate rolling plain and it gently slope towards the west. This area is about 62.49 square kilometer. The research area is underlain by Recent to Pleistocene age valley fill deposit and Pliocene age Arzarnigon sand rocks. Arzarnigon sand rocks are medium to coarse-grained sand rocks, and sometime gritty. The sources of water supply are water from tube well and reservoir (Gyobyu reservoir). The main aquifer in western part is valley filled deposit and in the middle part it is Arzarnigon sand rock. The yield of valley filled deposit is 2000 to 4000 gallons per hour. pH is mostly about 7.77. TDS is 380 ppm. Total salinity is low and electrical conductivity (E.C) is always not more than 280 ? mho/cm. Iron content rising up to 6 ppm, is encountered. The concentration of chloride ion is widely distributed in most of the water of the studied region and the amount present in groundwater is relative higher than other anions. The results analyzed by KURLOV'S method and PIPER method can classified the water types. Groundwater is classified on the basic of total dissolved solid (T.D.S). According to WHO Drinking Water Standard, the groundwater of the research area is suitable for the drinking water.	2021
1859	Tin Myint Oo	A NEW LIGHT ON DEVELOPMENT AND EVOLUTION OF MANN ANTICLINE EAST FLANK OF SALIN BASIN	The Mann anticline occupies the northern part of the NNW-SSE trending first line of anticline structures known as Minbu-Htaukshabin-Tagaing-Chaungtha structural line which develops on the east flank of Salin Basin. It expresses on surface as anelongated, asymmetrical north plunging fault related anticline where Irrawaddian, Kyaukkok, Pyawbwe, Okhmintaung and Padaung formations as core were exposed and the northern plunging area of which is mainly covered by alluvium and Irrawaddians. Present study revisited the interpretations of gravity and dense seismic data and well to well correlations, as a result proposes a new light on the development and evolution of Mann anticline. From the gravity data it can be assumed that the northward plunge continues in the subsurface up to the latitude 20� 18? about 8 miles from outcrop area; the anticline is intersected by two longitudinal faults, one on the western and the other on the east limb, and there exist a E-W transverse fault at latitude 20� 15?. The seismic images of the anticline suggest that Mann anticline is a strike slip fault related inversion anticline of positive flower shape bounded by west hading high angle fault zone on the east limb and syn-inversion antithetic faults on the west. The anticline is broad with gentle flanks in the north and the core of the anticline nose narrows to the south with steepening flanks. The structural analysis of the seismic data led to the conclusion that two phases of structuration took place in Minbu area. The first phase was E-W compression in Late Oligocene and formed proto Mann anticline with a NNW-SSE trending oblique longitudinal normal fault along the crestal portion. The second phase is the dextral strike slip faulting initiated from Pliocene and continues to recent which caused inversion of the existing structures resulted in current positive flower shape configuration of Mann anticline. Over 600 wells were drilled on the Mann anticline to date and the well to well correlations confirmed existence of cross and oblique normal faults and longitudinal reverse faults which have effective sealing potential and compartmentalizing the anticline into numerous oil pools. The Sabwet Chaung indicated by gravity low anomaly is a zone of high angle conjugate normal faults dipping towards each other and separated Mann anticline from Htaukshabin Anticline. It may possibly has an active strike slip component and forming a passage through which the clay intermingled with water and gas seeps to the surface as small mud volcanoes at Nagapwet Taung.	2021
1860	Ko Yi Hla	MIDDLE SHELF ZONE FORAMINIFERAS OCCURRED IN THE SEDIMENTS OF NORTHERN PART OF THE ANDAMAN SEA	The sample collection sites are located in the northern part of the Andaman sea. Ayeyarwady continental shelf is a part of Andaman Sea. There are five zones of Ayeyarwady continental shelf are recognized; Near shore zone, Inner shelf zone, Middle shelf zone, Outer shelf zone and Upper slope zone.Very low to high diversity of twenty four foraminiferal species are found in the Middle shelf zone environment. Faunal distribution and population are different in the study area and distinct genera of foraminiferas are observed in specific condition. It is noteworthy that faunal diversity and species diversity are encountered in different areas. By studying of the foraminiferas, Osangularia bengalensis species are dominant in the Middle shelf zone environment.	2021

Research Publications

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