Myo Kyaw Hlaing | Kyushu University (original) (raw)

Papers by Myo Kyaw Hlaing

Research paper thumbnail of Pathology of Interstitial Pneumonia Associated with Hypothyroidism-Report of Three Cases

Recently, idiopathic pulmonary fibrosis (IPF) associated with hypothyroidism was proposed as a po... more Recently, idiopathic pulmonary fibrosis (IPF) associated with hypothyroidism was proposed as a possible link showing worse prognosis than IPF. We have reviewed our archives of interstitial pneumonias (IPs) and examined pathologic and clinical features of IPs associated with hypothyroidism to understand its variations. Pathologically, two cases showed usual interstitial pneumonia pattern, and one case showed non-specific interstitial pneumonia pattern. Small airway disease was a common histological feature in all cases. Two cases showed association with flavor of connective tissue disease (CTD). Diagnoses by multidisciplinary discussion for the three cases were IPF, unclassifiable IP, and systemic sclerosis associated interstitial lung disease. Our cases indicated that IPs associated with hypothyroidism may show not only IPF but also other histological types and probable connection to CTD. Furthermore, these three cases did not fit with predicted prognosis by histological patterns.

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Research paper thumbnail of Origin and Characteristics of the Shwetagun Deposit, Modi Taung-Nankwe Gold District and the Kunzeik and Zibyaung Deposits, Kyaikhto Gold District in Mergui Belt, Myanmar: Implications for Fluid Source and Orogenic Gold Mineralization

Frontiers in Earth Science

The Mergui Belt of Myanmar is endowed with several important orogenic gold deposits, which have e... more The Mergui Belt of Myanmar is endowed with several important orogenic gold deposits, which have economic significance and exploration potential. The present research is focused on two gold districts, Modi Taung-Nankwe and Kyaikhto in the Mergui Belt comparing their geological setting, ore and alteration mineralogy, fluid inclusion characteristics, and ore-forming processes. Both of the gold districts show similarities in nature and characteristics of gold-bearing quartz veins occurring as sheeted veins, massive veins, stockworks to spider veinlets. These gold deposits are mainly hosted by the mudstone, slaty mudstone, greywacke sandstone, slate, and slaty phyllite of Mergui Group (dominantly of Carboniferous age). The gold-bearing quartz veins generally trend from NNE to N-S, whereas some veins strike NW-SE in all deposits. The gold-bearing quartz veins are mainly occurred within the faults and shear zones throughout the two gold districts. Wall-rock alterations at Shwetagun are mai...

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Research paper thumbnail of Origin and Characteristics of the Shwetagun Deposit, Modi Taung-Nankwe Gold District and the Kunzeik and Zibyaung Deposits, Kyaikhto Gold District in Mergui Belt, Myanmar: Implications for Fluid Source and Orogenic Gold Mineralization

Frontiers in Earth Science, 2021

The Mergui Belt of Myanmar is endowed with several important orogenic gold deposits, which have e... more The Mergui Belt of Myanmar is endowed with several important orogenic gold deposits, which have economic significance and exploration potential. The present research is focused on two gold districts, Modi Taung-Nankwe and Kyaikhto in the Mergui Belt comparing their geological setting, ore and alteration mineralogy, fluid inclusion characteristics, and ore-forming processes. Both of the gold districts show similarities in nature and characteristics of gold-bearing quartz veins occurring as sheeted veins, massive veins, stockworks to spider veinlets. These gold deposits are mainly hosted by the mudstone, slaty mudstone, greywacke sandstone, slate, and slaty phyllite of Mergui Group (dominantly of Carboniferous age). The gold-bearing quartz veins generally trend from NNE to N-S, whereas some veins strike NW-SE in all deposits. The gold-bearing quartz veins are mainly occurred within the faults and shear zones throughout the two gold districts. Wall-rock alterations at Shwetagun are mainly silicification, chloritization, and sericitization, whereas in Kyaikhto, silicification, carbonation, as well as chloritization, and sericitization are common. At Shwetagun, the gold occurred as electrum grains in fractures within the veins and sulfides. In Kyaikhto, the quartz-carbonate-sulfide and quartz-sulfide veins appeared to have formed from multiple episodes of gold formation categorizing mainly as free native gold grains in fractures within the veins or invisible native gold and electrum within sulfides. At Shwetagun, the ore minerals in the auriferous quartz veins include pyrite, galena, and sphalerite, with a lesser amount of electrum, chalcopyrite, arsenopyrite, chlorite, and sericite. In Kyaikhto, the common mineralogy associated with gold mineralization is pyrite, chalcopyrite, sphalerite, galena, pyrrhotite, arsenopyrite, marcasite, magnetite, hematite, ankerite, calcite, chlorite, epidote, albite, and sericite.

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Research paper thumbnail of Increasing adhesion of current-conducting coatings on alumina substrates

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Research paper thumbnail of Gold Mineralization in the Kyaikhto District, Mon State, Southern Myanmar

The Kyaikhto gold district is located within the Slate Belt and Mogok Metamorphic Belt of Souther... more The Kyaikhto gold district is located within the Slate Belt and Mogok Metamorphic Belt of Southern Myanmar. The study area is covered by Carboniferous to Lower Permian metasedimentary rocks consisting of slate, phyllite, and schist of the Mergui Group, intruded by later igneous rocks. Four gold occurrences have been identified in the Kyaikhto district: the Kunzeik in the north, Zibyaung, and Thae Phyu Chaung in the center and Meyon in the south. Gold mineralization in the Kyaikhto district is associated with sheeted, stockwork, dissemination, and sulfide-bearing quartz veins. Ore minerals recognized include sphalerite, galena, chalcopyrite, molybdenite and pyrite with minor native gold and electrum. Two types of fluid inclusions were examined in the quartz samples of the Kunzeik and Zibyaung—Type A: aqueous carbonic fluid inclusions and Type B: aqueous fluid inclusions. At the Kunzeik, Type A fluid inclusions homogenize at temperatures from 296°C to 376°C with low salinities (1.6 - ...

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Research paper thumbnail of Geology and fluid inclusion studies on the Shwetagun gold mineralization at Yamethin Township, Mandalay Region, central Myanmar

International Symposium on Earth Science and Technology 2019, 2019

The Shwetagun gold mineralization is located at the southeastern part of Yamethin Township, Manda... more The Shwetagun gold mineralization is located at the southeastern part of Yamethin Township, Mandalay Region, central Myanmar, which lies on the Slate Belt about 3 km from Modi Taung orogenic gold deposit. The study area is mainly hosted by mudstone and slate. Gold-quartz veins are oriented in NW-SE and nearly N-S directions. Especially, in adits I and II, the gold-bearing quartz veins display stylolitic lamination and book-ribbon textures. In adit III, the strong post-vein faulting more or less in the plane of the shear results in pinched and swelled, and brecciated. F1 and F2 faults are mainly related to the mineralized veins in the study area. Ore minerals in the auriferous quartz veins include pyrite and chalcopyrite, with less abundant electrum, sphalerite and galena. A combined ore petrography, SEM-EDS study distinguishes morphological and compositional differences in the early and transitional pyrites (Py I and Py II). Py I form common small euhedral inclusions in later Py II subhedral crystals. Several zones of alteration have been outlined which are structurally controlled with general trends of NW and SE. The most common alterations are chloritization, sericitization and silicification that can be clearly observed around mudstone and slate units. According to the preliminary results of fluid inclusion, the homogenization temperatures of fluid inclusions in vein quartz vary from 250 to 335 °C, with salinities from 0.2 to 4.8 wt.% NaCl equivalent.

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Research paper thumbnail of Gold Mineralization in the Kyaikhto District, Mon State, Southern Myanmar

Open Journal of Geology, 2019

The Kyaikhto gold district is located within the Slate Belt and Mogok Meta-morphic Belt of Southe... more The Kyaikhto gold district is located within the Slate Belt and Mogok Meta-morphic Belt of Southern Myanmar. The study area is covered by Carboni-ferous to Lower Permian metasedimentary rocks consisting of slate, phyllite, and schist of the Mergui Group, intruded by later igneous rocks. Four gold occurrences have been identified in the Kyaikhto district: the Kunzeik in the north, Zibyaung, and Thae Phyu Chaung in the center and Meyon in the south. Gold mineralization in the Kyaikhto district is associated with sheeted, stockwork, dissemination, and sulfide-bearing quartz veins. Ore minerals recognized include sphalerite, galena, chalcopyrite, molybdenite and pyrite with minor native gold and electrum. Two types of fluid inclusions were examined in the quartz samples of the Kunzeik and Zibyaung-Type A: aqueous carbonic fluid inclusions and Type B: aqueous fluid inclusions. At the Kun-zeik, Type A fluid inclusions homogenize at temperatures from 296˚C to 376˚C with low salinities (1.6-4.6 wt% NaCl equivalent). The homogeniza-tion temperatures of Type B fluid inclusions in vein quartz range from 246˚C to 312˚C, with salinities of between 1.2 and 10.7 wt% NaCl equivalent. In the Zibyaung, the homogenization temperatures of Type A inclusions vary from 305˚C to 378˚C, with salinities from 4.6 to 9.6 wt% NaCl equivalent. The homogenization temperatures of Type B fluid inclusions mainly range from 242˚C to 298˚C, with salinities from 0.9 to 11.8 wt% NaCl equivalent. These characteristics of fluid inclusions are similar to those of orogenic gold mine-ralization systems.

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Research paper thumbnail of Pathology of Interstitial Pneumonia Associated with Hypothyroidism-Report of Three Cases

Recently, idiopathic pulmonary fibrosis (IPF) associated with hypothyroidism was proposed as a po... more Recently, idiopathic pulmonary fibrosis (IPF) associated with hypothyroidism was proposed as a possible link showing worse prognosis than IPF. We have reviewed our archives of interstitial pneumonias (IPs) and examined pathologic and clinical features of IPs associated with hypothyroidism to understand its variations. Pathologically, two cases showed usual interstitial pneumonia pattern, and one case showed non-specific interstitial pneumonia pattern. Small airway disease was a common histological feature in all cases. Two cases showed association with flavor of connective tissue disease (CTD). Diagnoses by multidisciplinary discussion for the three cases were IPF, unclassifiable IP, and systemic sclerosis associated interstitial lung disease. Our cases indicated that IPs associated with hypothyroidism may show not only IPF but also other histological types and probable connection to CTD. Furthermore, these three cases did not fit with predicted prognosis by histological patterns.

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Research paper thumbnail of Origin and Characteristics of the Shwetagun Deposit, Modi Taung-Nankwe Gold District and the Kunzeik and Zibyaung Deposits, Kyaikhto Gold District in Mergui Belt, Myanmar: Implications for Fluid Source and Orogenic Gold Mineralization

Frontiers in Earth Science

The Mergui Belt of Myanmar is endowed with several important orogenic gold deposits, which have e... more The Mergui Belt of Myanmar is endowed with several important orogenic gold deposits, which have economic significance and exploration potential. The present research is focused on two gold districts, Modi Taung-Nankwe and Kyaikhto in the Mergui Belt comparing their geological setting, ore and alteration mineralogy, fluid inclusion characteristics, and ore-forming processes. Both of the gold districts show similarities in nature and characteristics of gold-bearing quartz veins occurring as sheeted veins, massive veins, stockworks to spider veinlets. These gold deposits are mainly hosted by the mudstone, slaty mudstone, greywacke sandstone, slate, and slaty phyllite of Mergui Group (dominantly of Carboniferous age). The gold-bearing quartz veins generally trend from NNE to N-S, whereas some veins strike NW-SE in all deposits. The gold-bearing quartz veins are mainly occurred within the faults and shear zones throughout the two gold districts. Wall-rock alterations at Shwetagun are mai...

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Research paper thumbnail of Origin and Characteristics of the Shwetagun Deposit, Modi Taung-Nankwe Gold District and the Kunzeik and Zibyaung Deposits, Kyaikhto Gold District in Mergui Belt, Myanmar: Implications for Fluid Source and Orogenic Gold Mineralization

Frontiers in Earth Science, 2021

The Mergui Belt of Myanmar is endowed with several important orogenic gold deposits, which have e... more The Mergui Belt of Myanmar is endowed with several important orogenic gold deposits, which have economic significance and exploration potential. The present research is focused on two gold districts, Modi Taung-Nankwe and Kyaikhto in the Mergui Belt comparing their geological setting, ore and alteration mineralogy, fluid inclusion characteristics, and ore-forming processes. Both of the gold districts show similarities in nature and characteristics of gold-bearing quartz veins occurring as sheeted veins, massive veins, stockworks to spider veinlets. These gold deposits are mainly hosted by the mudstone, slaty mudstone, greywacke sandstone, slate, and slaty phyllite of Mergui Group (dominantly of Carboniferous age). The gold-bearing quartz veins generally trend from NNE to N-S, whereas some veins strike NW-SE in all deposits. The gold-bearing quartz veins are mainly occurred within the faults and shear zones throughout the two gold districts. Wall-rock alterations at Shwetagun are mainly silicification, chloritization, and sericitization, whereas in Kyaikhto, silicification, carbonation, as well as chloritization, and sericitization are common. At Shwetagun, the gold occurred as electrum grains in fractures within the veins and sulfides. In Kyaikhto, the quartz-carbonate-sulfide and quartz-sulfide veins appeared to have formed from multiple episodes of gold formation categorizing mainly as free native gold grains in fractures within the veins or invisible native gold and electrum within sulfides. At Shwetagun, the ore minerals in the auriferous quartz veins include pyrite, galena, and sphalerite, with a lesser amount of electrum, chalcopyrite, arsenopyrite, chlorite, and sericite. In Kyaikhto, the common mineralogy associated with gold mineralization is pyrite, chalcopyrite, sphalerite, galena, pyrrhotite, arsenopyrite, marcasite, magnetite, hematite, ankerite, calcite, chlorite, epidote, albite, and sericite.

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Research paper thumbnail of Increasing adhesion of current-conducting coatings on alumina substrates

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Research paper thumbnail of Gold Mineralization in the Kyaikhto District, Mon State, Southern Myanmar

The Kyaikhto gold district is located within the Slate Belt and Mogok Metamorphic Belt of Souther... more The Kyaikhto gold district is located within the Slate Belt and Mogok Metamorphic Belt of Southern Myanmar. The study area is covered by Carboniferous to Lower Permian metasedimentary rocks consisting of slate, phyllite, and schist of the Mergui Group, intruded by later igneous rocks. Four gold occurrences have been identified in the Kyaikhto district: the Kunzeik in the north, Zibyaung, and Thae Phyu Chaung in the center and Meyon in the south. Gold mineralization in the Kyaikhto district is associated with sheeted, stockwork, dissemination, and sulfide-bearing quartz veins. Ore minerals recognized include sphalerite, galena, chalcopyrite, molybdenite and pyrite with minor native gold and electrum. Two types of fluid inclusions were examined in the quartz samples of the Kunzeik and Zibyaung—Type A: aqueous carbonic fluid inclusions and Type B: aqueous fluid inclusions. At the Kunzeik, Type A fluid inclusions homogenize at temperatures from 296°C to 376°C with low salinities (1.6 - ...

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Research paper thumbnail of Geology and fluid inclusion studies on the Shwetagun gold mineralization at Yamethin Township, Mandalay Region, central Myanmar

International Symposium on Earth Science and Technology 2019, 2019

The Shwetagun gold mineralization is located at the southeastern part of Yamethin Township, Manda... more The Shwetagun gold mineralization is located at the southeastern part of Yamethin Township, Mandalay Region, central Myanmar, which lies on the Slate Belt about 3 km from Modi Taung orogenic gold deposit. The study area is mainly hosted by mudstone and slate. Gold-quartz veins are oriented in NW-SE and nearly N-S directions. Especially, in adits I and II, the gold-bearing quartz veins display stylolitic lamination and book-ribbon textures. In adit III, the strong post-vein faulting more or less in the plane of the shear results in pinched and swelled, and brecciated. F1 and F2 faults are mainly related to the mineralized veins in the study area. Ore minerals in the auriferous quartz veins include pyrite and chalcopyrite, with less abundant electrum, sphalerite and galena. A combined ore petrography, SEM-EDS study distinguishes morphological and compositional differences in the early and transitional pyrites (Py I and Py II). Py I form common small euhedral inclusions in later Py II subhedral crystals. Several zones of alteration have been outlined which are structurally controlled with general trends of NW and SE. The most common alterations are chloritization, sericitization and silicification that can be clearly observed around mudstone and slate units. According to the preliminary results of fluid inclusion, the homogenization temperatures of fluid inclusions in vein quartz vary from 250 to 335 °C, with salinities from 0.2 to 4.8 wt.% NaCl equivalent.

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Research paper thumbnail of Gold Mineralization in the Kyaikhto District, Mon State, Southern Myanmar

Open Journal of Geology, 2019

The Kyaikhto gold district is located within the Slate Belt and Mogok Meta-morphic Belt of Southe... more The Kyaikhto gold district is located within the Slate Belt and Mogok Meta-morphic Belt of Southern Myanmar. The study area is covered by Carboni-ferous to Lower Permian metasedimentary rocks consisting of slate, phyllite, and schist of the Mergui Group, intruded by later igneous rocks. Four gold occurrences have been identified in the Kyaikhto district: the Kunzeik in the north, Zibyaung, and Thae Phyu Chaung in the center and Meyon in the south. Gold mineralization in the Kyaikhto district is associated with sheeted, stockwork, dissemination, and sulfide-bearing quartz veins. Ore minerals recognized include sphalerite, galena, chalcopyrite, molybdenite and pyrite with minor native gold and electrum. Two types of fluid inclusions were examined in the quartz samples of the Kunzeik and Zibyaung-Type A: aqueous carbonic fluid inclusions and Type B: aqueous fluid inclusions. At the Kun-zeik, Type A fluid inclusions homogenize at temperatures from 296˚C to 376˚C with low salinities (1.6-4.6 wt% NaCl equivalent). The homogeniza-tion temperatures of Type B fluid inclusions in vein quartz range from 246˚C to 312˚C, with salinities of between 1.2 and 10.7 wt% NaCl equivalent. In the Zibyaung, the homogenization temperatures of Type A inclusions vary from 305˚C to 378˚C, with salinities from 4.6 to 9.6 wt% NaCl equivalent. The homogenization temperatures of Type B fluid inclusions mainly range from 242˚C to 298˚C, with salinities from 0.9 to 11.8 wt% NaCl equivalent. These characteristics of fluid inclusions are similar to those of orogenic gold mine-ralization systems.

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