• Title/Summary/Keyword: 대륙

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과학기술, 그 뿌리와 현주서 - 지질학편(중)

  • Choe, Deok-Geun
    • The Science & Technology
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    • v.32 no.7
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    • pp.20-22
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    • 1999
  • 지구의 대륙형성을 15~16세기 베이컨은 대서양 양쪽 해안선 윤곽이 비슷하다는 점을 들어 하나의 대륙이 천재지변에 의해 변형된 것이라고 주장했다. 19세기 들어 허튼은 지구수축설을 들고 나왔고 20세기 초 대륙이동에 대한 논문이 미국의 테일러와 독일의 베개너에 의하여 발표되었다. 특히 베게너는 "대륙과 해양의 기원"이라는 저서를 통해 대륙이동설을 펼쳤으나 1930년 베게너의 죽음과 함께 많은 과학자들의 반박에 밀려 대륙이동설은 고개를 숙이게 되었다.

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Crustal Structure of the Continental Margin of Korea in the East Sea: Results From Deep Seismic Sounding (한반도의 동해 대륙주변부의 지각구조 : 심부 탄성파탐사결과)

  • Kim Han-Joon;Cho Hyun-Moo;Jou Hyeong-Tae;Hong Jong-Kuk;Yoo Hai-Soo;Baag Chang-Eop
    • Geophysics and Geophysical Exploration
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    • v.6 no.1
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    • pp.40-52
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    • 2003
  • Despite the various opening models of the southwestern part of the East Sea (Japan Sea) between the Korean Peninsula and the Japan Arc, the continental margin of the Korean Peninsula remains unknown in crustal structure. As a result, continental rifting and subsequent seafloor spreading processes to explain the opening of the East Sea have not been adequately addressed. We investigated crustal and sedimentary velocity structures across the Korean margin into the adjacent Ulleung Basin from multichannel seismic reflection and ocean bottom seismometer data. The Ulleung Basin shows crustal velocity structure typical of oceanic although its crustal thickness of about 10 km is greater than normal. The continental margin documents rapid transition from continental to oceanic crust, exhibiting a remarkable decrease in crustal thickness accompanied by shallowing of Moho over a distance of about 50 km. The crustal model of the margin is characterized by a high-velocity (up to 7.4 km/s) lower crustal (HVLC) layer that is thicker than 10 km under the slope base and pinches out seawards. The HVLC layer is interpreted as magmatic underplating emplaced during continental rifting In response to high upper mantle temperature. The acoustic basement of the slope base shows an igneous stratigraphy developed by massive volcanic eruption. These features suggest that the evolution of the Korean margin can be explained by the processes occurring at volcanic rifted margins. Global earthquake tomography supports our interpretation by defining the abnormally hot upper mantle across the Korean margin and in the Ulleung Basin.

호주 남극탐사기지- 영하60℃의 남극대륙

  • Korean Federation of Science and Technology Societies
    • The Science & Technology
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    • v.10 no.7
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    • pp.46-50
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    • 1977
  • 주. 사우디 ㆍ아라비아에서 남극의 빙산을 사들여 음료수와 용수로 쓸 계획을 추진하고 있다는 보도가 있다. 장구한 세월동안 오직얼음과 침묵속에 깊이 잠겨있던 남극대륙이 열강의 탐사대의 강력한 도전으로 그 베일이 하나 둘 벗겨짐에 따라 우리와 남극와의 관계가 점점더 두터워가고 있음을 깨닫게 된다. 남극에 가장 근접해있고 남극대륙의 약 절반에 달하는 광윤한 지역에 대한 영토권을 주장하고 있는 호주가 근착한 "Australia Now"자에서 호주 남극탐사기지를 중심으로 우리에게는 아직 생소한 남극대륙을 흥미있게 소개하고 있어 이를 옮겼다. 과학적인 기사라는데 관심이 가고 또 다른 이유가 있다면 삼복더위에 납량의 선물이 될까 하는 생각에서 서둘러 싣는다

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The Characteristics of Cognition on Continents and Nations: In Case of Korean High School Students (우리나라 고등학생들의 대륙 및 국가에 대한 인지 특성)

  • Sung, Sin-Je;Lee, Hee-Yul
    • Journal of the Korean association of regional geographers
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    • v.12 no.6
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    • pp.733-747
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    • 2006
  • This paper aims to grasp the characteristics of the cognition and preference on the continents, their relationship, and then each nation's location and direction in case of Korean high school students. First, there exists difference of cognition by six continents as well as by gender and experience of foreign visit among the students. The students have somewhat different preference by each continent, which was affected by gender and experience of foreign visit as well. Second, the cognition of the students on each nation's location showed a positive relation with that on the continents, which was decided by adjacent distance with Korea. The empirical results showed that the higher the gaps of latitude over longitude are, the lower the cognition of the students on direction among nations are. Moreover there are significant gaps by gender and experience of foreign visit in orientation ability. As a result, the geography education may have to be develop the high school students' balanced cognition ability in relation to continents and nations.

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Determinants of FDI in Developing Countries : comparative analysis of Asia, Africa and Latin America (개발도상국의 외국인 직접투자 결정요인 분석 : 아시아·아프리카·남미 비교)

  • Chinzorigt, Narantsetseg;Choi, Chang-Hwan
    • Korea Trade Review
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    • v.41 no.4
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    • pp.1-19
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    • 2016
  • This paper analyzed what determines affected FDI inflow of developing countries by using panel data from 65 lower-middle income and low income countries(Asia, Africa and Latin America). Empirical results showed that economic growth has a more positive impact on a middle income country than a lower one, and has a better impact on the Asian continent than others. Trade has similar effect on lower and middle income countries, respectively. ODA, however, has a negative effect on both sides, regardless of the continent. Industrial value added rate and labor force have a positive effect on FDI in low and middle income countries. Infrastructure was found to be a significant impact on FDI inflows in lower-middle income countries than in low income countries. There is no geographically significant difference except Africa.

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SNS Utilization Profiled as Per Six Continental Areas, Dance Genre, Types at Overseas Dance Arts Companies (해외무용예술단체의 6대륙 지역별, 무용장르별, 유형별, SNS 활용 프로파일)

  • Jeon, Soon-Hee;Yang, Yu-Na
    • The Journal of the Korea Contents Association
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    • v.14 no.8
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    • pp.74-83
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    • 2014
  • This study was conducted for the overall analysis for the interests, generally and uses of SNS (Social Network Service) of the overseas dance arts company. The subjects of this study were total 3,614 of countries, public, private and personal dance arts company in 100 countries on six continents. The selected 627 company which operate at least one SNS, and included them in this study. Then analyzed the SNS utilization six continental areas as per dance gener, types, and dance gener analyzed as per types. Also analyzed the SNS utilization six continental areas, dance gener as per types and obtained the following result First, It appeared that Ballet company of North America continent took advantage of SNS the most. Second, It appeared that Facebook, Twitter of North America was the most frequently used. Third, It appeared that Facebook wsa the most frequently used by traditional dance company. Fourth. Facebook, Twitter, Youtube were the most activity used by Ballet company of North America continent. In conclusion, this study recommends the policy alternatives related to the awareness of digital media, the establishment of the SNS marketing information system.

옥천변성대 북동부(충주-황강리 지역)내 앰피볼라이트의 암석 화학적 고찰

  • 유영복;김형식
    • Proceedings of the Mineralogical Society of Korea Conference
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    • pp.132-132
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    • 2001
  • 옥천변성대의 충주-황강리 지역내 앰피볼라이트의 기원암은 염기성 화성암으로 쏠레이아이트 계열의 변이질암에 속한다. Fe $O^{*}$/MgO값의 변화에 대하여 분별작용에 의해 영향을 받는 주성분 원소와 미량원소들의 변화를 보게되면 Ti $O_2$, Fe $O^{*}$와 불호정성 원소(incompatible element)인 Zr, Nb, Hf, Ta, Th 등은 분별작용동안 증가하는 반면 호정성 원소(compatible element)인 MgO, $Al_2$ $O_3$, Ni, Cr 등은 감소하는 경향을 보여주고 있다. Fe $O^{*}$/MgO, Ti $O_2$ 그리고 Fe $O^{*}$는 심해성 쏠레이아이트 영역으로부터 분화된 경향을 나타내 주고 있다. Ni, Cr은 Fe $O^{*}$/MgO값의 증가에 따라 급속히 감소하며 안정한 대륙과 해저화산의 영역에 도시되고 있으며 칼크-알칼리(CA)와는 관계가 없고 쏠레이아이트의 영역에서 변화 패턴을 보여주어 앰피볼라이트가 활동적인 대륙연변부의 지구조 환경보다는 안정한 대륙이나 해저화산과 관계가 더 있음을 시사한다. 경휘토류 원소(LREE)는 중휘토류 원소(HREE)에 비해 더욱 부화된 특성을 띠고 원자번호가 증가하면서 표준화된 휘토류 원소패턴의 경사가 점차 감소하는 경향을 보여주고 있다. 대부분의 시료들은 큰 Eu이상치를 갖고 있지 않아 마그마 정출 과정동안 사장석의 분별작용이 거의 수반되지 않았음을 지시하고 전체적인 휘토류 원소의 패턴은 거의 평행하게 나타나므로 기원 마그마가 유사함을 의미하고 있다. 비유동성 원소를 이용한 여러 판별도표들을 통해서 본암은 대륙성 현무암질암으로서 판내부 환경에서 유래되었으며 대륙내부 열곡의 알칼리 현무암과 대륙성 현무암 영역에 속하는 것으로 보아서 대륙지각내 열곡작용과 같은 장력운동에 수반되어 생성된 것임을 시사해 주고 있다. 앰피볼라이트의 지각혼성화를 평가하기 위해 이에 필요한 몇 개의 지화학적 매개변수를 계산한 결과 La/Ta, La/Nb, Nb/Th들의 값이 오염 안된 마그마의 값을 지시해 주어 본암이 지각혼성화 작용을 받지 않은 것으로 나타났다. 대부분의 시료들은 P-타입 MORB의 영역에 속하며 소수의 시료가 T-타입 MORB의 영역에 도시되고 있어 본 앰피볼라이트의 생성에는 양적으로 다른 두 가지의 유사한 마그마가 수반된 것으로 추정된다. 것으로 추정된다.

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Sedimentary Carbon Cycle in the Continental Shelf and Continental Slope off Gampo, East Sea (동해 감포해역 대륙붕 및 대륙사면 퇴적환경에서 탄소순환)

  • Han, Myung-Woo;Lee, In-Ho;Shim, Jeong-Hee
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.4 no.3
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    • pp.208-214
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    • 1999
  • In order to determine if there is any physiographic preference for sedimentary organic matter preservation, two gravity cores were collected off Gampo, East Sea: one from continental shelf and the other from continental slope. Concentrations of porewater nutrients and total $CO_2$ were all higher in the continental shelf station, St. A, than the continental slope station, St. B. Meanwhile, concentrations of porewater sulfate decreased more rapidly at St. A than at St. B. Sedimentary organic carbon and nitrogen contents were lower and decreased more rapidly at St. A than at St. B. These data characters of porewater chemistry and sedimentary organic matter suggest that the organic matter is more actively decomposed at St. A than at St. B. At least over the study area, therefore, the sedimentary organic matter in the continental slope appears to be better preserved than that in the continental shelf.

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Crustal Structure of the Continent-Ocean Zone around the Middle Eastern Part of Korean Peninsula Using Gravity Data (중력자료를 이용한 한반도 중부 대륙-해양 지역의 지각구조 연구)

  • 유상훈;민경덕;박찬홍;원중선
    • Economic and Environmental Geology
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    • v.35 no.5
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    • pp.455-463
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    • 2002
  • There have been few geophysical studies on the crustal structure of the continent-ocean zone around the middle eastern part of Korean peninsula, because of the lack of database in both land and ocean. The area for the study on the internal crustal structure using gravity data is bounded by the latitude of 37$^{\circ}$-38"N and longitude of 128$^{\circ}$-132$^{\circ}$E. WCA correction is applied to shipborne gravity data to integrate with gravity anomalies obtained on land. The high frequency components of the shipborne gravity data which are considered as the noise on survey track are effectively removed by means of correlating with satellite gravity data. The corrected shipborne free-air gravity anomaly is integrated with the Bouguer gravity anomaly on land under the same condition. The integrated gravity anomaly is divided into four areas for power spectrum analysis. The depths of Moho discontinuity increases gradually from inland to Ulleung basin. As the result of modeling based on power spectrum analysis, Moho discontinuity depth is about 33-35 km in the continental zone of Korea and 18-28 km at the continental margin. Such structural character is well elucidated in changing gravity data around Ulleung basin. The depths of Moho discontinuity in the southern ocean of Ulleung-island is 16--17 km, which is much lower than in the land. The result of crustal structure modeling in this study is similar to that computed by prior seismic exploration around this area.