Study on development and value for geotourism of horizontal columnar joints at the Jeongja beach area, Ulsan and Eupchon beach area, Gyeongju

다국어 초록 (Multilingual Abstract)

Unusual columnar joint patterns are developed in Tertiary volcanic rocks along the Jeongja and Eupchon beaches. The columnar joints show interesting variations in shape and orientation, including horizontal and inclined column distribution. The shape and orientation of these columnar joints were analyzed to understand the reason for the unusual column patterns. For these purposes, the shape of column face perpendicular to the column direction and the trend and plunge of the columns are analyzed. Most joint columns have five or six column faces, and the column diameter perpendicular to the column direction is in a range of 30-50 cm. Columnar joints commonly develop perpendicular to the surface. However, unusual horizontal and inclined columnar joints are observed in the study areas. It is known that the direction of columnar joints indicates the direction of joint propagation associated with cooling of the lava. Therefore, the horizontal and inclined columnar joints developed in the study areas may suggest unusual cooling environment. The analysed distribution of the columnar joint patterns in the study areas may indicate lateral cooling by the effect of sea water. If the characteristics of these unusual columnar joints are more intensively investigated, we can suggest a new mechanism for the development of columnar joints. In addition, the columnar joints developed in this areas are geologically very unusual in scale and shape, and the features are spectacular in scene. Therefore, it will be a great value for international geotourism site, if it is well preserved and studied.

참고문헌 (Reference)

1 Dowling, R., 478-, 2008

2 박양대, "한국지질도(1:50,000), 울산도폭" 국립지질조사소 5-, 1968

3 진명식, "한국의 지질노두 150선" 한국지질자원연구원 344-, 2004

4 정강환, "한국 화강암질암류 산지에서 발달하는 암괴류에 관한 연구" 6 : 71-82, 2000

5 황상구, "주왕산 국립공원의 지형경관과 지질학적 지배 요인: 용결상과 주상절리" 한국암석학회 18 (18): 195-209, 2009

6 고정선, "제주도 대포동현무암에 발달한 지삿개 주상절리의 형태학 및 암석학적 연구" 14 : 212-225, 2005

7 손문, "울산군 강동면 제3기 정자분지의 지질구조와 분지발달" 27 : 65-80, 1994

8 허철호, "오대산 국립공원의 지질 및 지형경관자원 조사를 통한 관광지질학적 가치 증진: 지구과학의 대중적 이해" 한국지구과학회 26 (26): 218-231, 2005

9 이수재, "보존가치가 있는 지형 - 지질의 대상 설정에 관한 연구" 한국환경정책평가연구원 162-, 2003

10 허철호, "관광지질학 활성화를 위한 지질 및 지형경관자원 개발에 관한 연구- 내장산 국립공원을 중심으로" 대한자원환경지질학회 38 (38): 355-367, 2005

11 허철호, "관광지질학 활성화를 위한 지질 및 지형경관자원 개발에 관한 연구 -태안해안국립공원을 중심으로" 한국지구과학회 28 (28): 75-86, 2007

12 Reiter, M., "Thermomechanical model for incremental fracturing in cooling lava flows" 142 : 241-260, 1987

13 Spry, A., "The origin of columnar jointing, particularly in basalt flows" 8 : 191-216, 1962

14 Peck, D.L., "The formation of columnar joints in the upper part of Kilauean lava lakes, Hawaii" 79 : 1151-1166, 1968

15 Lyle, P., "The eruption environment of multi-tiered columnar basalt lava flows" 157 : 715-722, 2000

16 Iddings, J.P., "The columnar structure in the igneous rock on orange Mountain, New Jersey" 31 : 321-331, 1886

17 Tomkeieff, S.I., "The basalt lavas of the Giant's Causeway district of northern Ireland" 6 : 89-143, 1940

18 Stueve, A.M., "The Geotourism study: Phase 1 Executive Summary" National Geographic 2002

19 Hose, T.A., "Telling the story of Britain's stone" 10 : 16-17, 1995

20 DeGraff, J.M., "Surface morphology of columnar joints and its significance to mechanics and direction of joint growth" 99 : 605-617, 1987

21 Long, P.E., "Structures, textures, and cooling histories of Columbia River basalt flows" 97 : 1144-1155, 1986

22 Schmincke, H.-U., "Stratigraphy and petrography of four upper Yakima basalt flows in south-central Washington" 78 : 1385-1422, 1967

23 Lee, J. I., "Provenance and thermal maturity of the lower Cretaceous Gyeongsang Supergroup, Korea" Seoul National University 2000

24 Yoon, S., "Paleoenvironmental change of the Tertiary Yangnam and Pohang basins of the southern Korean Peninsula" 37 : 117-124, 1992

25 Mallet, R., "On the origin or production of the prismatic (or columnar structure of basalt)" 50 : 122-135, 1875

26 Goto, Y., "Morphology and growth style of a Miocene submarine dacite lava dome at Atsumi, northeast Japan" 134 : 255-275, 2004

27 Haq, B.U., "Mesozoic and Cenozoic chronostratigraphy and cycles of sea level change. in: Sea level changes: and integrated approach: SEPM Special Publication 42" 71-108, 1988

28 진명식, "K-Ar 및 휫션트랙법에 의한 포항-감포 일대 화산암류의 암석연령 측정 연구" 51-88, 1988

29 Badman, T., "Interpreting earth science sites for the public" The Geological Society 429-432, 1994

30 김근미, "Geotourism 대상지역의 지질공학적 특성 및 장기 보존 기술에 대한 기초 연구" 한국지구시스템공학회 39 (39): 19-25, 2002

31 Hose, T.A., "Geotourism in England: a two-region case study analysis" University of Birmingham 2003

32 Dowling, R., "Geotourism" Elsevier 260-, 2006

33 James, A.V.G., "Factors producing columnar structure in lavas and its occurrence near Melbourne, Australia" 28 : 458-469, 1920

34 Aydin, A., "Evolution of polygonal fracture patterns in lava flows" 239 : 471-476, 1988

35 Ryan, M.P., "Cyclic fracture mechanisms in cooling basalt" 89 : 1295-1308, 1978

36 Grossenbacher, K.A., "Conductive cooling of lava: columnar joint diameter and stria width as functions of cooling rate and thermal gradient" 69 : 95-103, 1995

37 Toramaru, A., "Columnar joint morphology and cooling rate: A strach-water mixture experiment" 109 (109): 1-10, 2004

38 Lodge, R.W.D., "Anisotropic stress accumulation in cooling lava flows and resulting fracture patterns: Insights from starch-water desiccation experiments" 185 : 323-336, 2009