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尹成孝 부산대학교 사범대학 1990 교사교육연구 Vol.21 No.-
Haenam-Mogpo circular topography is the topographic expression fabricated by geological setting and structures of the deeper level of the Haenam-Mogpo resurgent cauldron which formed by volcanic activities correlated with the Youcheon group in the Kyeongsang basin, SE Korea in late Cretaceus(Cenomanian to Campanian). According to field observation, the processes of volcanic activities are inferred as follows : 1) Pre-caldera andesitic eruption and sedimentation of volcaniclastic sediments (Hwawon formation) occurred in Cenomanian(94.1±2.Ma). 2) In the late stage of andesitic activities, lacustrine black shale(Uhangri formation) was deposited. 3) In the final stage of black shale sedimentation, phreatomagmatic to plinian eruptions of silicic magma deposited several thin accretionary lapilli tuff layers maximum 16cm in thickness in the upper part of the black shale sequence. 4) Succeeding silicic pyroclastic flows accumulated on the andesitic field. In response to large volume of rhyolitic ash-flow tuff eruption(82.8±1.2Ma), probable concurrent collapse of caldera floor resulted in thick accumulation of Hwangsan ash flow tuff on the collapsing caldera floor. 5) Renewed rising of magma chamber after caldera collapse, has resurgently uplifted the caldera floor and emplaced as central pluton which intruded its own intracaldera volcanic cover. Resurgence took the form of a northwest trending antiform within the caldera floor and are characterized by dome structure, having outward dippings of the Hwangsan ash-flow tuft. The volcano-tectonic depression formed between uplifting structure and topographic wall of the caldera and measures about 30km in diameter. 6) Post-collapse ring-fracture volcanism(79.6±3.2Ma, 79.4±1.7Ma) was occurred forming numerous rhyolite domes(Jindo rhyolite and breccia) and moat sediments along the southern margin of the caldera. 7) Hydrothermal system of convective circulation of meteoric water percolated through fracture beneath post-resurgent depression were formed over the buried heat source of the post-collapse rhyolite. This low temperature hydrothermal activities caused pervasive argillic alteration of the rhyolite and moat sediments along the southern ring fracture zone of the caldera, and formed the Ogmaesan(74.9±2.1Ma) and Bugok(74.0±2.0Ma) clay deposits. The epithermal acid sulfate type alteration accompanied some precious metal enrichment. The Haenam-Mogpo resurgent cauldron generally fits the model of cauldron development described by Smith and Bailey(1968).
제주도 동부 알칼리 현무암내 스피넬-레졸라이트 포획체의 연구
윤성효,고정선,안지영,Yun, Sung Hyo,Koh, Jeong Seon,Anh, Ji Young 대한자원환경지질학회 1998 자원환경지질 Vol.31 No.5
The spinel Ihelzolite of ultramafic xenoliths are found in the alkali basalt from eastern part of the Cheju island, Korea. The xenolith is are mainly composed of olivine, orthopyroxene, clinopyroxene and spinel. Based on the chemical compositions of the constituent minerals, the ultramafic xenolith belong to upper mantle peridotite. Each minerals have a protogranular texture. Olivine with kink band texture partly shows undulatory extinction. Some clinopyroxenes have spongy textured rims. Brown spinels occur in the interstices between olivine and pyroxene grains. Olivine is mostly forsterite $(Fo_{89-90})$. Orthopyroxene is enstatite $(Wo_{1.3}En_{88.4}Fs_{10.3})$ with 3.87~5.25 wt% $Al_{2}O_{3}$. Clinopyroxene is diopside $(Wo_{48.0}En_{46.2}Fs_{5.8})$ with 6.75~5.03 wt% $Al_{2}O_{3}$. Spinel has the Mg value of 75.9 and its Cr-number is 10.2. According to the PoT estimations for the mantle xenoliths, equilibrium temperatures of the xenoliths range from 1023 to $1038^{\circ}C$ and pressure is 18 kbar. Spinellhelzolite from this area, which is characterized by lower Cr-number (10.2) and homogeneous chemical compositions, supports that these ultramafic xenoliths are derived from the upper mantle.
전남(全南) 고흥반도(高興半島)에 분포(分布)하는 화산암류(火山岩類)의 화산층서(火山層序) 및 암석학적(岩石學的) 연구(硏究)
윤성효,황인호,Yun, Sung Hyo,Hwang, In Ho 대한자원환경지질학회 1988 자원환경지질 Vol.21 No.4
The author aimed to describe the volcano-stratigraphy and petrology of the volcanic mass in the Koheung peninsula, South Cheolla province. The volcanic mass is composed of the volcanics and intrusives of late Cretaceous which extruded the Pre-cambrian metamorphic(Jirisan gneiss complex) and the early Cretaceous sedimentary(Duwon Formation) basement. The volcanic pile consists of, in ascending order, Bibongsan andesite, Koheung tuff and breccia, and Palyeongsan welded tuff, and are intruded by ring intrusives( intrusive breccia, andesite porphyry, intrusive rhyolite and fine-grained quartz-diorite) and central pluton(diorite, quartz monzodiorite, biotite granite and micrographic granite). Bibongsan andesite mainly consists of andesite tuff and lava. Koheung tuff consists of alternation of fine tuff, coarse tuff and lapilli tuff, and Palyeongsan welded tuff which overlies Koheung tuff, comprises K-feldspar and quartz phenocrysts, elongated brown fiamme, lithic fragments in matrix of devitrified brown glass shards, and mainly consists of rhyodacite to rhyolite vitric ash-flow tuff. The results of petrochemical studies of the igneous rocks suggest that the rocks were a serial differentiational products of fractional crystallization of calc-alkaline magma series. This study reveals that the volcanic mass in this area is inferred to the remnant of the resurgent cauldron, measuring 30 by 25 km in diameter. The cauldron block was lowered at least 1,000 m by ring fault displacement.
포항분지(浦項盆地) 북부(北部)(칠포(七浦)-월포(月浦)일원)에 분포(分布)하는 화산암류(火山岩類)에 대한 암석학적(岩石學的)·층서적(層序的) 연구(硏究)
윤성효,Yun, Sung Hyo 대한자원환경지질학회 1988 자원환경지질 Vol.21 No.2
The purpose of this study is to determine the stratigraphy of the volcanic rocks in the Chilpo-Weolpo area, the north of Pohang basin, based on field survey and lithological properties of the rocks. The volcanic pile(Chilpo tuff) overlies the Cretaceous sedimentary formation and is unconformably overlain by the Miocene Yeonil Group. The Chilpo tuff comprises a thick sequence(>200m) of pyroclastic flow deposits. Five members are distinguished, each representing separate flow units, comprising none(or weakly) to densely welded rhyolite tuff. The Chilpo tuff consists of, in ascending order, greenish weakly welded tuff, volcanic conglomerate, alternation of tuff breccias and fine tuffs, greenish none to densely welded tuff and red-brownish densely to weakly welded vitric tuff. This study revealed that the volcanic rocks in this area were formed by 4 volcanic stages. On the basis of K-Ar age($44.7{\pm}1.1\;Ma$) and lithologic data, geological age of the Chilpo tuff may be Eocene.
尹成孝,朴基鎬 부산대학교 사범대학 1991 교사교육연구 Vol.23 No.-
A small gabbroic intrusion(1.4 km2) emplaced into the Cretaceous sedimentary formation(Banyaweol Formation), is exposed in the Mt. Bangga area, Yeongcheon-gun, Kyeongsangbuk-do. The modes of occurrence and petrographic features have been described in some detail. The gabbroids show medium- to coarse grained equgranular texture, and partly show orbicular structure which composed of leuccratic proto-core of plagioclase and olivine, and layering marked by alternation of mafic and felsic minerals. New chemical analyses are presented for 14 gabbroic rocks, four biotite and eleven olivine. The gabbroids are characteristically rich in Al₂O₃, CaO and MgO, and relatively poor in SiO₂ and Na₂O. Hense, a high-alumina basalt magma with normative olivine is assumed as a primary magma. The variation of major elements, trace elements and REEs pattern show the differentiation of the gabbroic magma, which belongs to transitional series and I-type. The gabbroic magma chamber is considered to have been formed at rather deeper depth (below than about 30km) in the lower crust.