전세계 연해해분들의 생성연대와 기반수심과의 상호관계 및 그들의 구조적 해석 2

박충화 대한지질학회 1992 대한지질학회 학술대회 Vol.1992 No.

비정상적 심해성 연해해분에 관한 연구

박충화 大田大學校 環境問題硏究所 1998 환경문제연구소 논문집 Vol.3 No.-

One One remarkable correlation has been noticed with a number of marginal basins are being subducted by itself. For example, extinct Philippine Sea basins are subducted: the West Philippine Basin at the Philippine and Ryukyu Trenches, the Shikoku and Parece Vela Basins at the Nankai Trough. Similar cases are observed in China with the Manila Trench, the South Fiji Basin with two subduction zones: the Hunter subduction zone in the northwestern and of the basin, and the Kadavu subduction zone in the northeastern end of the basin and the Solomon Basin with three subduction zones, the New Britain, the Bougainville and the Trobriand Trenches. All these basin basins are several hundreds meters deeper than the normal oceans. The Sulu and Celebes Basins have traces of past subduction. These basins are also deeper than the normal oceans by about 600 m and 950 m, respectively. Among them fully subducting basins such as the Philippine Sea and Solomon Basin seem to be deeper than partially subducted basins such as the South Fiji and South China Basins. In sharp contrast several marginal basins with depths close to those of the normal oceans are not being subducted at the margin. High density of upper asthenosphere beneath deep back-arc basins is likely to be a necessary condition for occurrence of subduction in such small marginal basins.

활동적 배호상 해분의 비대칭적 지형에 관한 연구

박충화 대한지질학회 1996 대한지질학회 학술대회 Vol.1996 No.

보존용액 처리가 자생 참두메부추(Allium spirale Willd.)와 갯부추(A. pseudojaponicum Makino)의 절화 품질과 수명에 미치는 영향

박충화,김정민,신운섭,장보국,최혁재,임연진 한국화훼학회 2022 화훼연구 Vol.30 No.4

This study was conducted to examine the suitability of Allium spirale Willd. and A. pseudojaponicum Makino as the cut flower by assessing the effect of different holding solutions on vase life, solution uptake rate, and relative fresh weight of the species. After harvest, cut flowers were treated with 50, 75, and 100 mg·L-1 of gibberellic acid (GA3), 25, 50, and 100 mg·L-1 of 8-hydroxyquinoline sulfate (8-HQS), 0.1, 0.3, and 0.5 mM of silver thiosulfate (STS), 8 ml·L-1 of Chrysal, and 10 ml·L-1of Floralife. The vase life of A. spirale flowers was eight days in holding solutions containing 8 ml·L-1 of Chrysal, which was significantly longer than 2.3 days, as observed in the distilled water of control. Chrysal and Floralife significantly extended the vase life of A. spirale and increased relative fresh weight and water uptake using different holding solutions. However, the vase life of cut flower stems did not vary significantly between the other treatments. On the other side, the vase life of A. pseudojaponicum was only extended up to seven days in 100 mg·L-1 GA3 treatment. The vase life of A. pseudojaponicum was similar to or slightly higher than that of the distilled water in other treatments except for the GA3 preservation solution. The cut flower quality and vase life of A. pseudojaponicum were the best in 100 mg·L-1 GA3 treatment. 본 연구는 관상가치가 있는 자생 참두메부추와 갯부추를절화소재로 이용하고자 수행되었다. 실험은 절화가 수확된직후, gibberellic acid(GA3) 50, 75, 100mg·L-1, silver thiosulfate(STS) 0.1, 0.3, 0.5mM, 8-hydroxyquinoline sulfate(8-HQS) 25, 50, 100mg·L-1, 그리고 시중에 판매되고 있는 Chrysal 8mL·L-1, Floralife 10mL·L-1의 보존용액에 처리되었다. 참두메부추의 절화수명 연장에는 Chrysal 보존용액 처리가 가장 효과적이었으며 다음으로 75mg·L-1 GA3 처리가 효과적이었다. 한편 8-HQS와 STS는 참두메부추의절화수명을 단축하고 줄기가 갈변하는 등의 부정적인 영향을끼쳤다. Chrysal과 더불어 Floralife 보존용액 처리는 절화참두메부추의 상대 생체중변화율을 높이는데 효과가 있었다. 반면 갯부추는 100mg·L-1 GA3 처리에서 절화수명이 유일하게 7일까지 연장되었다. GA3 보존용액 처리를 제외한 다른처리에서 갯부추의 절화수명은 증류수인 대조구보다 비슷하거나 약간 높은 수준이었다. 절화 갯부추의 수분흡수율은 실험 초반 100mg·L-1 8-HQS 처리에서, 상대 생체중변화율은Chrysal 보존용액 처리에서 가장 높게 조사되었으나 두 처리 모두 절화수명이 유의하게 연장되지 않았다. 갯부추는100mg·L-1 GA3 처리에서 절화수명을 비롯한 절화품질이 가장 우수하였다.

활동적 배호상 해분의 비대칭적 지형과 그들의 구조적 해석

박충화,Park, Chung-Hwa 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.6

Active young back-arc basin such as Mariana, Havre, Lau, Manus, East Scotia basins have asymmetric topography of two types in respect to the spreading axis. The arc-trench wing of Mariana Trough, Lau basin and Havre Trough are shallower toward the active arc, whereas those Manus and East Scotia basins are nearly symmetric to the opposite wings. The other asymmetry which shows the spreading axis deviated from the geographic axis toward the active arc is observed in each basin. Active young back-arc basins show a large variety of asymmetry rates ranging from the lowest East Scotia Basin to the highest Mariana Trough. The asymmetric topography of these young back-arc basins seems to be caused by the rollback rate of downgoing slab under the basin. As the rollback rate increases, the asymmetry rate systematically decreases.

뉴헤브리디스 해분의 지질학적 특징에 관한 연구

박충화 大田大學校 環境問題硏究所 1997 환경문제연구소 논문집 Vol.2 No.-

The New Hebrides Basin is an inactive non back-arc basin located at the convergent boundary of the Pacific and Indo-Australian plates. This basin was formed from 46 Ma to 60Ma. The basin has two spreading episodes with rates of 34 mm/a for 42 to 47 Ma and 17 mm/a for 47 to 60 Ma. The sediments covered in the basin has uniform thickness of 0.65 sec. The age-depth correlation curve of the New Hebrides Basin can be represented by the following equation: Depth (m) = 2689 + 312 √Age (Ma) The coefficient of 312 in this equation is close to that for major oceans, 350. This suggests that the cooling processes of the lithospheres in the New Hebrides Basin and major oceans are similar to each other. Free-air gravity anomalies of the basin varying from -22.3 mgal to 59.0 mgal. The mean value is 30.2 mgal higher than those of the normal oceans. Moderately large free-air gravity anomalies in the New Hebrides Basin are presumably owing to its location on a marginal swell along the New Hebrides Trench. It is generally observed of the trench axis. Positive free-air gravity anomalies amounting to 50-60 mgal are usually observed on the crest of the swell. This topography is presumably by bending of the oceanic lithosphere so as to dynamically maintain nonisostatic states for some duration.

뉴헤브리디스 해분의 지질.지구물리학적 특징에 관한 연구

박충화,Park, Chung-Hwa 한국지구과학회 1997 韓國地球科學會誌 Vol.18 No.6

뉴헤브리디스 해분은 태평양판과 인도-오스트레일리아판의 경계부에 위치한 고령의 비활동적 비배호상 해분이다. 46 Ma에서 60 Ma 사이에 형성된 뉴헤브리디스 해분은 형성과정상 34 mm/a(42 Ma$\sim$47 Ma)와 17 mm/a(47 Ma$\sim$60 Ma)의 두가지 상이한 확장율을 보이며, 해분의 표층은 0.65 sec두께의 퇴적층으로 전반적으로 고르게 피복되어 있다. 본 연구에서 산출된 해분의 생장 발달 곡선은 $Depth(m)=2689+312\sqrt{Age}(Ma)$라는 수식으로 표현될 수 있으며, 여기서 냉각계수 312는 일반대양저의 350과 매우 유사함을 보이는 것이 특징이다. 이러한 특징은 해분의 암권의 생장 발달과정이 일반대양저와 유사할 가능성을 강력히 시사하고 있는 것으로 사료된다. 해분의 전반적인 후리-에어 중력 이상치는 -22.3 mgal에서 +59.0 mgal까지 심한 변화폭을 보이고 있다. 평균 중력이상치는 +30.2 mgal로 일반대양저에 비해 현저히 높은 값을 나타내고 있다. 이는 일반적으로 잘 나타나지 않는 매우 특이한 현상이다. 이것은 해분 자체가 섭입하는 판경계에 위치해 있어 marginal swell의 형상을 취하고 있기 때문인 것으로 해석된다. 이 swell들은 일반적으로 해구축상에서 대양저를 향해 약 200 km 범위내에서 관찰되어지며, 이들의 후리-에어 중력이상치는 평균 $+50{\sim}160mgal$을 보이는 것이 일반적이다. 해분의 높은 양의 중력이상은 이러한 지형적인 특수성에 기인하는 것으로 보여진다. 해분의 위치적 특성 및 암권 자체의 구부러짐에 따른 불안정성은 뉴 헤브리디스 해분의 대표적인 지질 지구물리학적 특징이라고 할 수 있다. The New Hebrides Basin is an inactive non back-arc basin located at the convergent boundary of the Pacific and Info-Australian plates. This basin was formed from 46 Ma to 60 Ma. The basin has two spreading episodes with rates of 34 mm/a for 42 to 47 Ma and 17 mm/a for 47 to 60 Ma. The sediments covered in the basin has uniform thickness of 0.65 sec. The age-depth correlation curve of the New Hebrides Basin can be represented by the following equation: $Depth(m)=2689+312\sqrt{Age}(Ma)$ The coefficient of 312 in this equation is close to that for major oceans, 350. This suggests that the cooling processes of the lithospheres in the New Hebrides Basin and major oceans are similar to each other. Free-air gravity anomalies of the basin varying from -22.3 mgal to +59.0 mgal. The mean value is +30.2 mgal higher than those of the normal oceans. Moderately large free-air gravity anomalies in the New Hebrides Basin are presumably owing to its location on a marginal swell along the New Hebrides Trench. It is generally observed that the ocean floor is very gently uplifted in a zone about 200 km oceanward of the trench axis. Positive free-air gravity anomalies amounting to $50{\sim}60$ mgal are usually observed on the crest of the swell. This topography is presumably by bending of the oceanic lithosphere so as to dynamically maintain nonisostatic states for some duration.

시추공 물리탐사를 이용한 동탄성계수와 암상과의 상관성 분석

박충화,박종오,송무영 한국지구과학회 2002 韓國地球科學會誌 Vol.23 No.6

서태평양에 분포하는 연해해분들의 주기적 생성에 관한 연구

박충화 한국지구과학회 1992 韓國地球科學會誌 Vol.13 No.2

In this study the presence of pulse in formation of marginal basins through calculation of production rates based on the age of 22 marginal basins distributed in the western Pacific is revealed. The peaks of their productions appear approximately at 0 Ma, 30 Ma and 60 Ma, with the interval of about 30 my. Production peak appears to be the largest near 30 Ma (45 × 10⁴ ㎢). From the fluctuation of production rates, continuous production of marginal basins after 0 Ma (present-day) is inferred, and it is very likely that a production peak which is considerably higher than 30 Ma peak would appear in the future. Such upward inclination of production rates of marginal basins is vividly contrasting to downward decline of those of normal oceans. During the period of declining activities between 10 Ma and 15 Ma no activities of marginal basins are observed. When the marginal basins are classified into back-arc and non back-arc basins on the basis of their evolutionary processes, it is observed that back-arc basins appear to have cyclic production peaks approximately at 0 Ma, 20 Ma and 45 Ma, with the interval of about 20 my. The present-day back-arc basins appear to he most active in their productions. The phenomenon of fluctuations in the quantity of production upto now shows a upward climbing trend. The periods with less activity of back-arc basins appear to have been active in arc volcanism. It is considered that the formation of marginal basins and arc volcanism have been alternately active with time. Non back-arc basins seem to have been formed concentrically at about 25 Ma - 35 Ma and 55 Ma - 80 Ma. In the back-arc basins distributed near northwestern (NW) and southwestern (SW) Pacific around equator, it is revealed that production peak has been moved from SW (55 - 80 Ma) through NW (15 - 55 Ma) to SW (0 - 10 Ma) Pacific in time and space. It is supposed that the periodic formation of marginal basins with time is associated with spatial cycles.

절개사면에서 전기비저항 토모그래피 적용 기법

박충화,박종오,Park, Chung-Hwa,Park, Jong-Oh 대한지질공학회 2007 지질공학 Vol.17 No.2

To find out the anomalous zone in cut slope composed of phyllite and shist, we performed resistivity tomography using a pole-dipole way. The electrical distribution that propagates from a current source in lower part of slope is measured by a potential electrode in upper part of slope. Apparent resistivity data are inverted with an iterative regularized inversion method to reconstruct 3D resistivity image. By comparing with the resistivity images in relation to each section, the images of anomalous zone correspond to their positions represented in cut slope. Therefore, the application of resistivity tomography in cut slope is useful to recognize the extension of anomalous zone. 천매암 및 편암으로 구성된 기지의 절개사면에서 제시된 이상대는 사면 하단부에 설정된 전류원과 상단부의 전위전극으로 하는 단극-쌍극자 배열을 이용한 전기비저항 토모그래피 방식으로 파악되었다. 해석 방법은 각 측선에서 얻어진 측정 자료를 가지고 3차원 전기비저항 역산 방법으로 하였다. 각 측선에 따른 영상들을 볼 때, 사면의 중앙부에 위치한 단층은 사면에 거의 수직인 방향으로 연장된 영상들로 제시되었다. 수치모델링 결과에서 이상대의 영상들은 절개사면에서 제시된 위치에 매우 정확한 결과들로 보여 주었으며, 단층은 절개사면으로부터 거리가 멀어질수록 지표로부터 그 심도가 깊어지는 경향으로 나타났다.