서울-남천점 지질도폭 설명서
상세정보
| 자료유형 | KIGAM 보고서 |
|---|---|
| 서명 | 서울-남천점 지질도폭 설명서 |
| 저자 | 이병주 |
| 언어 | KOR |
| 청구기호 | KR-M-25-06-1999-M |
| 발행사항 | 한국자원연구소, 1999 |
| 초록 | : 서울-남천점도폭은 국립지리원 발간 1:250,000 서울 지형도(도엽번호 NJ 52-90)와 남천점 지형도(도엽번호 NJ 52-5)의 일부를 포함하는 지역으로 서울도폭은 경위도 상으로는 동경 126。 00″-127。 45″, 북위 37。 00″-38。 00″이고 남천점도폭은 동경 126。 00″-127。 45″, 북위 38。 00″-이북 남방 한계선까지를 점한다. 행정구역상으로는 서울도폭은 서울특별시, 인천광역시, 경기도 평택시, 오산시, 용인시, 이천시, 수원시, 의왕시, 군포시, 안산시, 시흥시, 광명시, 부천시, 과천시, 성남시, 하남시, 구리시, 남양주시, 의정부시, 파주시, 고양시, 동두천시, 김포군, 가평군, 양평군, 여주군 및 연천군 일부와 강원도 춘천시 및 홍천시 일부가 속한다. 남천점도폭은 경기도 파주시 북부와 연천군, 포천군 및 강원도 춘천시 일부와 화천군에 점한다. 이 중 일부분은 휴전선이 지나가는 곳으로 군사시설이 많아 지질조사에 어려움이 있었으며 1:50,000 도폭이 발간된 곳을 제외하고는 민통선 이남까지만 조사를 실시하였다 : Geological map of 1:250,000 scale, the Seoul-Namchonjeom sheet has been recompiled by Korea Institute of Geology, Mining & Materials (KIGAM) in 1998-1999. The sheet, bounded between the longitudes of 126 00 -127 45 E and the latitudes of 37 00 -38 18 N, occupies the western central part of Korean Peninsula. The western margin of the sheet is characterized by ria type coast line with scattered island and development of low lands, whereas the eastern part is typified by mountain-high. Geology of the sheet is composed mainly of Precambrian metamorphic rocks and Jurassic plutonic rocks, together with minor Jurassic and Cretaceous sedimentary and volcanic rocks and Quaternary basalt. Precambrian rocks include the Seosan Group, Kyeonggi Metamorphic Complex, Chuncheon Supergroup and Yeoncheon Group. The Seasan Group consists largely of banded gneiss, schist including minor quartzites and marbles and the Taean Formation. The Kyeonggi Metamorphic Complex consists largely of banded gneiss together with magmatitic gneiss and schists including a few of quartzites and marbles. In addition, abundant felsic intrusives including garnet-bearing granitic gneiss and leucocratic gneiss are incorporated with the metamorphic complex. Although the crustal evolution history of the Kyeonggi Metamorphic Complex has not been precisely determined yet, on the basis of some available geochronologic data, it is considered to be created by multitectonometamorphism ranging in ages from Middle Archean to Early Proterozoic. The Chuncheon Supergroup, representing the supracrustal rocks that were deposited on the Kyeonggi Metamorphic Complex, consists largely of gneisses and schists intercalated with a few of quartzites and marbles. Both the Kyeonggi Metamorphic Complex and the Chuncheon Supergroup were intruded by porphyroblastic gneiss including augen gneiss and granitic gneiss. The Yeoncheon Group, representing the Late Proterozoic supracrustal rocks that was deposite at the margin of the northwestern Kyeonggi massif, consists dominantly of low grade pelitic and psammopelitic schist, together with calc-silicate, limestone and quartzite. The granite gniss, considered as a Triassic felsic intrusive, occurs in the northwestern margin of the Kyeonggi massif. The Daedong Group of Triassic to Jurassic age in distributed in small areas of Kimpo-Tongjin, Yeoncheon, Janggohang and Seonmdido. The former is well known as the Kimpo coal field. The Jurassic Daebo intrusives including granites, gabbro, syenite and diorite are distributed especially in central and eastern part of the sheet. Cretaceous sedimentary and volcanic rocks are locally exposed in western and northern areas of the sheet, respectively. Small scale acidic dikes intrude pre-existing rocks and strata. During Quaternary time, basalts flew along the Hantan river, fluvial sediments filled up valleys and lower coastal areas and shallow marine sediments covered coastal regions. In the Seoul-Namchonjeom sheet, structural elements are predominated by NE to NS trending folds and faults. At the northwestern margin of the Kyeonggi massif, they are truncated by EW trending fold-and-thrust belt, the Imjingang belt which has been conjectrued as a possible extension of the Chinese collision belt between the Sino-Korean and Yangtze blocks |
| 페이지 | 64 p. |
| 키워드 | 서울남천점, 서울, 남천점, 도폭, 지질도 |
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