안동지역 화강암질암류에 대한 암석학적 연구

황상구,이보현 한국암석학회 2000 한국암석학회 학술발표회 논문집 Vol.- No.-

安東地域의 地質

황상구 安東大學校 安東地域社會開發硏究所 1991 安東開發硏究 Vol.2 No.1

This area is located in the east-central part of the South Korea. Geotectonically, the study area occupies the southern Taebaksan region of Ryeongnam Massif and the northern Kyoˇngsang Basion. So the area is composed of the Precambrian metamorphic rocks, the igneous rocks prior to the Jurassic and the sedimentary rocks of Kyoˇngsang Supergroup. The metamorphic rocks are composed of banded gneiss, crystalline limestone, amphibolite and granitic gneiss. The gneisses must be originated from any sedimentary rocks, because they intercalate crystalline limestone beds in several places. All the rocks were controlled under a regional metamorphism and a granitization in the Precambrian. The igneous rocks are composed of diorite and gabbro, Imha Granite, Andong Granite, and acidic dyke. The diorite and gabbro, included within the later Imha Granite, may be derived from a partial melting of the amphibolite in accordance to their amphibolite relicts. Imha Granite, which was intruded by Andong Granite, may develop the mylonitic foliation due to a ductile deformation on the northwestern part. Andong Granite of the Jurassic age occurs as a small batholith. The sedimentary rocks are composed of basal conglomerate, arkose sandstone, purple mudstone and gray shale. The rocks overlie uncomfortably the metamorphic and the igneous rocks. The basal conglomerate and arkose sandstone, which are distributed in the northern Andong Fault, may be correlated to Paekjadong Formation. Purple mudstone may almost connect to Hup'yoˇngdong Formation, and the gray shale should attach to Joˇmgok Formation southwards. The geology of this area would be formed by regional metamorphism, folding, granitization, partial melting, first plutonism, mylonitization, Jurassic plutonism, pegmatite intrusion, sedimentation and faulting in the prior order.

榮州 長壽地域 細粒質 複雲母 花崗岩에 대한 應用岩石學的 硏究(Ⅱ) : 化學性과 物質 Chemical and Physical Properties

황상구 안동대학교 기초과학연구소 1996 基礎科學 硏究論文集 Vol.7 No.1

The western Yeongju area is composed of metamorphic rocks, granitic rocks and dikes. The granitic rocks is divided into porphyritic biotite granodiorite, medium-grained biotite granodiorite, coarse-grained biotite granodiorite and fine-grained two mica granite, according to the interrelation, lithology and internal structure. The fine-grained two mica granite, which intruded the metamorphic rocks and the rest granitic rocks, is known as the most potential stone resource. I have reported lithology and structures of the granite in the first paper. Now I report petrography, modal composition, and chemical and physical properties for the fresh rock of the granite in the laboratory, and then account for where the granite will be used among various stone resources.

울릉도 말잔등응회암에서 시간에 따른 조성변화에 근거한 마그마 진화

황상구,이소진,안웅산 한국암석학회 2019 암석학회지 Vol.28 No.2

Ulleung Island is the top of an intraplate alkalic volcano rising 3200 m from sea floor in the East Sea (or Sea of Japan). The emergent 984.6 m consist of eruptive products of basaltic, trachytic and phonolitic magmas, which are divided into Dodong Basaltic Rocks, and Ulleung, Seonginbong and Nari groups. The Maljandeung Tuff in the Nari Group consists of thick pyroclastic sequences which are subdivided into 4 members (N-5, U-4, 3, 2), generating from explosive eruptions during past 18.8~5.6 ka B.P. From chemical data, the Member N-5, phonolitic in composition, is considerably enriched in incompatible elements and REE patterns with significant negative Eu anomalies. The members 4, 3 and 2 are phonolitic to tephriphonolitic in composition, and their REE patterns do not have significant Eu anomalies. In variation trend diagrams, many elements show abrupt compositional gaps between members, and gradual upward-mafic variations from phonolite to tephriphonolite within each member. It suggests a downward-mafic zonation that were evolved into phonolitic zone in the lower part to tephriphonolitic zone in upper part of magma chamber. It is supposed that the chemical stratification generated from multiple mechanisms of thermal gravidiffusion, crystal fractionation, and gradual melting and sequential emplacement. The stratified magmas were explosively erupted to generate a small caldera during short period (11 ka B.P.). Especially both members (U-3, 2) were accumulated by gradually erupting from the upper phonoltic zone to the lower tephriphonoltic zone of the stratified chamber in 8.4 ka B.P. and 5.6 ka B.P. time, respectively. 울릉도는 동해의 해저에서 3,200 m 판내 알칼리 화산의 상단부로 해수면 위에 984.6 m 높이로 출현한 섬이다. 이는 대체로 현무암질에서 조면암질과 포놀라이트질 마그마의 분출에 의해 형성되었으며, 도동현무암질암류, 울릉층군, 성인봉층군과 나리층군으로 구분된다. 최후기에 형성된 나리층군 중 말잔등응회암은 약 18.8~5.6 ka B.P.에 폭발적으로 분출하였으며, 4개 멤버(N-5, U-4, 3, 2)로 구성되는 두꺼운 화성쇄설성 층서로 이루어져 있다. 화학적 자료에 의하면, 최하부의 N-5는 포놀라이트질이고 불호정성 원소가 상당히 풍부하고 희토류(REE) 패턴이 뚜렷한 부의 Eu 이상을 나타낸다. 상부의 멤버 U-4, 3 및 2는 포놀라이트질 내지 테프리포놀라이트질이고 REE 패턴이 큰 Eu 이상을 가지지 않는다. 변화 경향도에서 많은 원소들은 멤버들 간에 조성적 단절을 보여주며, 각 멤버(특히 U-4, 3 및 2) 내에서는 하부에서 상부로 감에 따라 포놀라이트질에서 테프리포놀라이트질로 점진적으로 고철질 조성이 증가하는 체계적인 변화 양상을 보여준다. 이는 마그마챔버 내에서 마그마 조성이 상부의 포놀라이트질에서 하부의 테프리포놀라이트질로 변화하는 고철질 누대를 형성했음을 지시한다. 이 화학적 성층화는 마그마챔버에서 열중력확산, 결정분별작용과 점진적 용융 및 순차적 정치 등에 의해 복합적 기구로부터 일어났다고 생각된다. 이 성층화 마그마는 짧은 기간(약 11 ka) 동안 폭발적으로 분출되었고 작은 칼데라를 형성하였다. 특히 두 멤버(U-3, 2)는 각각 8.4 ka B.P.와 5.6 ka B.P. 시기에 성층화된 마그마챔버에서 상부의 포놀라이트질 조성대로부터 하부의 테프리포놀라이트질 조성대로 점진적으로 분출됨으로서 축적되었다.

경상분지 유천층군의 시층서적 의미

황상구,김상욱,김성규,안웅산,조인화,이소진,김정진 대한지질학회 2019 지질학회지 Vol.55 No.5

Based on the reliable absolute chronological data measured in the Yucheon Group, Gyeongsang Basin, the chronostratigraphic implication for the lithostratigraphy was investigated. The Yucheon Group can be largely divided into the Jusasan, Unmunsa, Yokji and Saryang subgroups by lithostratigraphy, which can be correlated with chronostratigraphic implication from the age ranges of each subgroup by zircon age data. In the central and southern parts of the Yucheon Subbasin, the eruption age of the Jusasan Subgroup ranges from 94.4 to 88.8 Ma, which correspond to the Turonian. And the eruption age of the Unmunsa Subgroup in the same areas show a range of 88.9 to 80.4 Ma, which corresponds to the Coniacian to the early Campanian. Meanwhile, the activity period of the Yokji Subgroup ranges from 78.4 Ma to 73.0 Ma, corresponding to late Campanian, if the U-Pb age of 78.40 Ma measured in the central part and 73.01 Ma in the southern part of the Yucheon Subbasin are regarded as the lower and upper limits, respectively. The active period of the Saryang Subgroup, from 71.7 to 60.1 Ma age, which corresponds to the Maastrichtian to Selandian, based on the combined data in the southern part of the Yucheon Subbasin, and in Uiseong and Yeongyang subbasins. It is expected that the classification of subgroups based on the chronostratigraphy can be utilized for stratigraphic correlation in the Yucheon Group. 경상분지 유천층군에 대해 현재까지 측정된 신뢰성 높은 절대연대 자료들을 바탕으로 그 암층서에 대한 시층서적 의미를 분석하였다. 유천층군은 암층서적으로 크게 주사산아층군, 운문사아층군, 욕지아층군과 사량아층군으로 구분할 수 있으며, 저어콘 U-Pb 연대자료에 의한 각 아층군의 연대범위로부터 시층서적 의미를 부과시킬 수 있다. 유천소분지 중앙부와 남부에서 주사산아층군의 분출시기는 94.4~88.8 Ma 범위로서 투로니언에해당되며, 운문사아층군의 분출시기는 88.9~80.4 Ma 범위로서 코니아시안에서 캄파니안 전기에 해당된다. 한편 욕지아층군은 유천소분지의 중앙부에서 78.40 Ma를 하한으로 설정하고 남부에서 73.01 Ma를 상한으로 잡으면 그 활동시기는 78.4~73.0 Ma 범위로서 캄파니안의 후기에 해당된다. 사량아층군은 유천소분지 남부와 의성 및 영양소분지에서의 연대범위를 합하면 그 활동시기가 71.7~60.1 Ma 범위로 확대되며 마스트리치안에서셀란디안에 해당된다. 시층서에 기반한 유천층군 아층군들의 구분이 앞으로 유천층군의 층서대비에 활용될 수있기를 기대한다.

영양소분지 청량산역암층과 오십봉현무암층의 중요성

황상구,우병걸 안동대학교 기초과학연구소 2000 基礎科學 硏究論文集 Vol.11 No.1

Cheongryangsan Formation was reported to stratigraphically overlie Gasongdong Formation and underlie Dogyedong Formation in the northern part of the Yeongyang subbasin, and to be divided into lower Cheongryangsan Member and upper Osipbong Member. But the members have more widely called as Cheongryangsan Conglomerate Formation and Osipbong Basalt Formation, because the latter have initially meant that thin basalts several times intercalate sedimentary rocks in the northern part but later must consider that they have a very dominant volume in the eastern one. One of both formations plays a role of a key bed for stratigraphical correlation between local spaces in the subbasin dominant absolutely for reddish beds. Namely, both formations play a role of the key bed in the northern and northwestern parts of the subbasin; the Osipbong Basalt Formation, the western and eastern ones; the Cheongryangsan Conglomerate Formation, the southeastern one.

수직형 LPE에 의한 InGaAsP / GaAs 단결정 성장 관한 연구

황상구,조호성,예병덕,배정철,홍창희 한국통신학회 1991 한국통신학회 학술대회논문집 Vol.- No.-

영덕 달산 지역 화산층서와 용암의 공급지

황상구,함희수,김지영,정해오 안동대학교 기초과학연구소 1999 基礎科學 硏究論文集 Vol.10 No.1

We traced the flow direction of Ipbong Andesite and dacite in Dalsan area, Yeongdeok. Elongate vesicles and lathlike plagioclase phenocysts are aligned in the outcrops or under microscope. The lineations from their alignment are excellently indicating the flow direction of lavas. The flow directions, which were measured from the lineations in the Ipbong Andesite, are NNW-SSE in the eastern part and NNE-SSW in the southwestern part. The flow lineations show a fanlike movement pattern from the mid-northern part that the diorite is distributed. The diorite area is prabably a potential source area of the andesite

청송 면봉산 칼데라 주변의 화성암류에 대한 SHRIMP U-Pb 연대측정과 화성과정

황상구,조인화,이기욱 대한지질학회 2017 지질학회지 Vol.53 No.6

Igneous rocks around the Myeonbongsan caldera are divided into Eobongsan Granitoid, Jukjang Volcanics, Tuffite, Myeonbongsan Tuff, Rhyolite and Bohyeonsan Granitoid. Their SHRIMP U-Pb zircon dating acquired age results of 76.92±0.91 Ma from the Eobongsan Granitoid, 65.03±0.16 Ma from the Myeonbongsan Tuff, 63.45±0.71 Ma from the eastern rhyolite dyke, 58.00±0.66 Ma from the northwestern rhyolite dyke, and 56.43±0.55 Ma from the fine-grained diorite and 56.07±0.60 Ma from the biotite granite of the Bohyeonsan Granitoid. The age data indicate that the Eobongsan Granitoid is older than the Myeonbongsan Tuff, though the former is thought to intrude the other because the Bohyeonsan Granitoid has been considered as Bulguksa Intrusive Group. The Eobongsan and Bohyeonsan granitoids may be considered as the later event of each igneous cycle, which shows the composite igneous process of a perfect igneous cycle passing from ash-flow tuff through caldera collapse and ring dyke into pluton in Myeonbongsan area. 면봉산 칼데라 주변의 화성암류는 어봉산화강암질암, 죽장화산암층, 층회암, 면봉산응회암, 유문암, 보현산화강암질암 순으로 산출된다. 이들의 SHRIMP U-Pb 저어콘 연대측정 결과에 의하면 어봉산화강암질암은76.92±0.91 Ma, 면봉산응회암은 65.03±0.16 Ma, 동측 유문암맥은 63.45±0.71 Ma, 북서측 유문암맥은 58.00±0.66 Ma, 보현산화강암질암에서 세립질 섬록암은 56.43±0.55 Ma와 흑운모 화강암은 56.07±0.60 Ma의 연대를 나타낸다. 이 자료에 의하면 어봉산화강암질암은 통상적으로 불국사관입암군으로 취급하여 면봉산응회암을 관입하는 것으로 여겨져 왔지만, 면봉산응회암보다 선기인 것을 지시한다. 어봉산화강암질암과 보현산화강암질암은 각각 2차례의 화성윤회의 마지막 사건의 심성암체로 볼 수 있다. 면봉산 지역에서는 회류응회암-칼데라 함몰-환상암맥-심성암으로 연결되는 완벽한 화성윤회를 거치는 복잡한 화성과정을 나타낸다.

부직포 융착 항균성 LDPE와 전용접착제를 적용한 콘크리트 저수조의 성능 평가

황상구,정용호 청운대학교 건설환경연구소 2011 청운대학교 건설환경연구소 논문집 Vol.6 No.2

In this study, general problems were investigated for the conventional water tank system, and concrete water tank system using adhesive agent and antimicrobial LDPE(Low Density Poly Ethylene) with nonwoven fabric was proposed as the reasonable solution for the conventional water tank system. As the results, the performance of water tank system with LDPE and nonwoven fabric was proved to be suitable for the Korean Standard and resolved physical problems which were the separation of water proof PE sheet from the concrete structure due to the vertical water pressure in concrete water tank. 본 연구에서는 기존의 저수조 공법에 대한 시공법을 대상으로 문제점을 분석하였고 이에 대한 대안으로서 LDPE 및 전용접착제를 적용한 저수조 라이닝공법을 제안하고 성능 평가를 실시하였다. 그 결과 기본적인 KS 기준을 만족하였으며, 동시에 그동안 기존 공법인 PE시트의 부분적, 물리적 부착공법에서 다수 발생하고 있는 융착된 접합부 이탈 및 콘크리트 구조체와 방수시트간의 분리로 인한 다양한 하자발생을 예방할 수 있을 것으로 판단되었다.