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동해 후포분지 퇴적물의 입도와 광물 분석을 통한 고환경 해석
전창표 ( Chang Pyo Jun ),김창환 ( Chang Hwan Kim ),김영규 ( Yeong Kyoo Kim ),이성주 ( Seong Joo Lee ) 한국광물학회 2014 광물과 암석 (J.Miner.Soc.Korea) Vol.27 No.3
Holocene plaeoenvironmental changes were interpreted by grain size and mineral analyses of a piston core (HB 13-2), obtained along the western slope of the Hupo Basin, Korea. The core sediments are characterized by two discrete, sedimentary facies: upper unit (0-0.4 mbsf) dominated by bioturbation structures with weak lamination, and lower unit (0.4-3.3 mbsf) characterized by intensified bioturbation toward bottom. Analysis of sensitive grain size and sortable silt demonstrated that the inflow of the Tsushima Warm Current (TWC) into the Hupo Basin strengthen from the period of sediment deposition over 0.82 mbsf. The minerals of the core sediments are composed mainly of quartz, microcline, orthoclase, albite and clay minerals including chlorite, kaolinite and illite. No noticeable changes of the mineral percentage was observed according to the grain size and depth of the samples. The integral breadth (Δ°2θ) of clay minerals from 1.4 mbsf to top layer shows an increasing trend, which clearly means climate warming from the period of sediment deposition above 1.4 mbsf. This interval correlates with the Holocene climate optimum at Mid Holocene.
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전창표 ( Chang Pyo Jun ),김창환 ( Chang Hwan Kim ),이성주 ( Seong Joo Lee ) 한국광물학회 2013 광물과 암석 (J.Miner.Soc.Korea) Vol.26 No.2
Sediment transport mechanism and distribution of organic sediments are elucidated by the study of particle size, mineralogy, organic matters and microfossils of the surface samples collected from seafloor adjacent Dokdo island. Shallow marine sediments are dominated by coarse- grained sediments including gravel and sand, and their sedimentation has mainly been controlled by traction. While the samples collected from oceanic zone are characterized by high contents of fine- grained sediments such as silt and mud in bulk sediments, and the changes of mineral compositions including clay minerals and feldspar, and the fine sediments have been deposited mainly by suspension. The change of organic sedimentary communities is detected between neritic and oceanic zone. Although marine organic matter is predominant in neritic zone terrestrial organic matter is monopolized according to increasing water depth. This trend is associated with grain size of sediments. The results also suggest that high pollen concentrations in whole organic matters may played an important role in excessive organic carbon in sediment.
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고씨동굴 박쥐배설물(Bat Guano) 퇴적층에 기인된 이차 인산염 및 황산염광물 특성
전창표 ( Chang Pyo Jun ),이성주 ( Seong Joo Lee ),공달용 ( Dal Yong Kong ),강일모 ( Il Mo Kang ),송윤구 ( Yun Goo Song ) 한국광물학회 2010 광물과 암석 (J.Miner.Soc.Korea) Vol.23 No.4
Mineralogical characterization was performed for the mineral assemblages precipitated at the boundary between limestone bedrock and bat guano deposits in the Gossi Cave, Korea. Francoanellite, taranakite, ardealite, brushite and monetite are observed as phosphate minerals and gypsum and a small amount of barite as sulfate minerals in the guano deposits. With the increase of depth, phosphates are changed as following sequence: taranakite → francoanellite → ardealite → brushite → monetite. This sequence indicates that the major parameters controlling the physico-chemical conditions under which these mineral assemblages were deposited are pH and relative humidity.
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동해 울릉분지와 후포분지 해양 퇴적물 코어의 광물학적 특성
이수지 ( Su Ji Lee ),김창환 ( Chang Hwan Kim ),전창표 ( Chang Pyo Jun ),이성주 ( Seong Joo Lee ),김영규 ( Yeong Kyoo Kim ) 한국광물학회 2015 광물과 암석 (J.Miner.Soc.Korea) Vol.28 No.1
This study was carried out in order to investigate the mineralogical characteristics of the core sediments (03GHP-02 and HB13-2), obtained from the Ulleung Basin and Hupo Basin, Korea. The results on mineral compositions, clay mineral compositions, and the total contents and sequential extraction of different fractions of the phosphorus in core samples showed that those values are different in two cores and also at different depths. In both samples, mineral compositions were the same, composed mainly of quartz, microcline, albite, calcite, opal A, pyrite, and clay minerals (illite, chlorite, kaolinite, and smectite). However, the sample from Hupo Basin contains more opal A. Both samples, especially the ones from Hupo Basin contains more smectite than those reported from East Sea, indicating the influence of paleo-Hwangwei River and the Tertiary Formation of Korea Peninsula. For the samples from Uleung Basin, at 0.7-3.5 m range in depth, the low content of opal A and the low illite crystallinity index can be inferred to indicate the relatively cool climate, corresponding to the ice age. Also, the content of total phosphorus was low in those samples. It was reported that East Sea at that time was isolated from the neighboring seas due to the decrease of the sea level, and as a result, the influx of sediments was supposed to be little through the strait and rivers. For the samples from Hupo Basin, there is no significant changes in clay mineral composition and the distribution of phosphorus with increasing depth. This little change can be interpreted to indicate that the sediments comprising the core might be deposited in a relatively short period of time or deposited in sedimentary environment in which there``s no significant changes in sediment supplies. The values of crystallinity index of clay minerals are high in those samples, indicating that it was relatively warm during that time. Although the increase of fluctuation pattern can be observed, showing that the climate of this period often changed, it is supposed that it was generally warm.
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한반도 남부의 화분-기후 관계와 화분 기반의 홀로세 중기 정량적 고기후 복원
이재영(Jaeyoung Lee),이상헌(Sangheon Yi),전창표(Chang-Pyo Jun),김용미(Yongmi Kim),이은미(Eunmi Lee),김동욱(Dongwook Kim) 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
1980년대 이후로 현생 화분 기반(modern pollen analogue)의 화석 화분 기록을 이용한 정량적인 고기후 복원 방법이 널리 사용되고 있다. 그러나 한반도에서 현생 화분을 이용한 고기후의 정량적인 복원 연구는 매우 미흡한 상태이다. 따라서 화분 기반의 정량적인 한반도 고기후 복원을 위해서는 통계적으로 충분한 현생 화분 자료가 필요하다. 이를 위해서 한반도 남부의 37개 산에서 198개의 토양 표층 시료로부터 현생 화분 자료를 획득하였다. 각 표층 시료 지역의 기후 정보와 현생 화분 자료를 이용하여 화분–기후의 관계를 파악한 후, 고기후를 정량적으로 복원하였다. Redundancy analysis (RDA)와 variation partition을 실시한 결과, 한반도 남부에서 화분 산출에 중요한 기후 변수는 Tann (Annual mean temperature)인 것으로 나타났다. 화분-기후의 관계는 RDA, Huisman–Olff-Fresco 모델 (eHOF)에 의해 추론되었다. AP (arboreal pollen) 분류군들은 기후 자료와 유의미한 상관관계를 보여주었다. 특히 화분 화석 중 기후 지시자로 사용된 분류군들은 기후 자료와 강한 상관관계를 보여주었으며, 기후 지시자로서의 역할과 현재 기후와의 관계가 대체로 일치하였다. 하지만 NAP (non-arboreal pollen) 분류군들은 기후 자료와 유의미한 상관관계를 보여주지 않았다. 우수한 전달 함수를 생성하기 위해 Weighted Averaging- Partial Least Squares (WA–PLS)와 Modern Analogue Techniques (MAT)를 실시하였으며, MAT가 더 우수한 성능을 보여주었다. 한반도 남부(고흥 지역)에서 복원된 Pann (Annual precipitation)은 홀로세 중기 동안 1,340–1,500 mm로 약 160 mm의 변동이 있으며 평균은 약 1,400 mm이다. Pann 변동은 ENSO 활동에 의한 태풍에 크게 영향을 받는 것으로 추정된다. 복원된 Tann은 홀로세 중기 동안 8.5–12.5℃로 약 4℃의 변동이 있으며 평균은 약 11.4℃이다. Tann은 쿠로시오 해류의 세기에 따라 7500–5100년 BP에는 대마 난류의 영향을 받았으며, 그 이후에는 동아시아 겨울 몬순의 영향을 받은 것으로 추정된다. 이번 연구를 통해 한반도 남부에서 현생 화분을 이용한 고기후 정량 복원의 전달 함수는 충분히 신뢰할 수 있음이 증명되었으며, 향후 한반도의 정량적 고기후 복원에 기여할 것으로 기대된다.
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국내 석회동굴(고씨동굴, 백룡동굴, 성류동굴)에 분포하는 박쥐 구아노의 광물학적 특성
공달용 ( Dal Yong Kong ),이성주 ( Seong Joo Lee ),전창표 ( Chang Pyo Jun ),김영규 ( Yeong Kyoo Kim ) 한국광물학회 2012 광물과 암석 (J.Miner.Soc.Korea) Vol.25 No.3
The guano formed from the bat excrement in a cave contains various sulfate and phosphate minerals formed from the reaction of bat excrement with surrounding rocks and clastic minerals. Therefore, the mineral compositions in the guano provide basic informations on the geochemical environments affecting mineral formation in a cave. This study was conducted to study the mineral compositions of guano and the factors affecting those compositions by comparing mineralogical and chemical compositions in three different limestone caves in Korea. The guano samples in Gossi Cave contain detrital minerals such as illite, quartz and feldspar and relatively large amount of gypsum. The contents of gypsum increase with increasing depth, which is different from the samples collected in other caves. The samples collected from Baekryong Cave have the similar mineral compositions to those in Gossi Cave, but they also contain additional kaolinite and very small amount of gypsum. The samples in Sungryu Cave have similar mineralogical compositions to those in Gossi Cave, but contian bassanite instead of gypsum. The mineralogical compositions are well correlated with the chemical compositions of guano. The mineral compositions indicate that, in Gossi Cave, the minerals were formed by the reaction of large amount of bat excrement with surrounding rocks in high humidity condition or in the condition of frequent floods. In the case of Sungryu Cave, bassanite which can be formed in a dry condition indicates that minerals were formed in a relatively low humidity condition.
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