• Proceedings of the KSEEG Conference
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• 2002.04a
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• pp.176-180
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• 2002

• Journal of the Korean earth science society
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• v.35 no.7
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• pp.554-561
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• 2014

The rock materials from the two stone heritages in the Seonbonsa temple, Gwanbong Seokjoyeoraejwasang (stone Buddha) and three-storied Stone Pagoda, show almost identical petrographic characteristics. They are greyish white porphyritic granites which mainly consist of plagioclase, alkali feldspar, quartz, biotite, hornblende, and chlorite. The rocks from the both heritages are petrographically similar to those from the outcrops of the Palgongsan granite near the temple. Modal compositions exhibit that the rocks from the stone Buddha belong to monzogranite, whereas those from the pagoda and the outcrop near the temple correspond to syeno- to monzo granite. Whole rock magnetic susceptibility data indicate that the rocks from the stone Buddha, the pagoda, and the outcrop have nearly the same susceptibility values ranging 9-16(${\times}10^{-3}\;SI$). Gamma spectrometer data obtained from these rocks also demonstrate the same value range. In conclusion the two stone heritages in the Seonbonsa temple were made of the Palgongsan granite surrounding the temple.

• Journal of The Geomorphological Association of Korea
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• v.18 no.4
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• pp.247-259
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• 2011

This research aimed to analyse geomorphic resources of Mt. palgong(in Daegu city and Gyeongbuk province) through some field surveys, and then to clarify geomorphic features. The main results are as follows. 1) The geological boundary of the south slope(granite) is more clear than one of the north slope(granite bedrock and metamorphic sedimentary rock). Small basins are along with fault line between granite bedrock and metamorphic sedimentary rock. 2) It is estimated that relatively big valleys on the north slope are due to local climate, geomorphic and geological features. 3) Tor, sheeting joint, gutter are well developed both on the south slope and on the north slope, however the development of polygonal cracking and boulder stream are more dominant on the south slope; river cliff, pool, waterfall are more dominant on the north slope with valleys that well developed. 4) Scenic geomorphic landscapes are mainly developed in Dongsan valley and Chisan valley on the north slope. 5) There are many interesting geomorphic resources in the viewpoint of storytelling in Mt. Palgong. So the specific design to utilize such resources is required

• Proceedings of the KGS Conference
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• 2002.11a
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• pp.97-100
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• 2002

지표의 기복은 암석의 차별적 풍화와 침식을 반영하므로, 기복의 형성에서 암석이 차지하는 몫을 이해하는 것은 중요하며 이 문제는 근대지형학의 발달 초기부터 중요하게 다루어져 왔다(권혁재, 2002).(Picture Omitted) 대구분지 북쪽 분수계를 이루고 있는 팔공산의 기반암은 중생대 백악기 말부터 제 3기초기에 걸쳐 백악기 퇴적암인 경상누층군을 관입하여 형성된 불국사화강암이다.(중략)

• Proceedings of the Mineralogical Society of Korea Conference
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• 2002.05a
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• pp.14-17
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• 2002

• Economic and Environmental Geology
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• v.16 no.2
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• pp.83-109
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• 1983

The Cretaceous Palgongsan granite is a typical, calc-alkaline, subsolvus monzogranite and shows characteristics of "I-type" granite by mineralogy and chemical composition. Many of the major and trace element characteristics of the Palgongsan granite are consistent with a relationship by fractional crystallisation to form a chemically zoned pattern. The granite show light REE enrichment with (Ce/Yb)N ratios of 5.78-9.50. All the REE patterns show Eu negative anomalies which become larger from the margin ($Eu/Eu^*=0.75$) to the core ($Eu/Eu^*=0.24$) of the pluton, mainly due to feldspar fractionation. Mineral geochemistry (alkali-feldspar, plagioclase & biotite) studies also show the zonal structure of the Palgongsan granite. The two-feldspar geothermometer shows that the temperature difference between the margin and the core part of the pluton is about $200^{\circ}C$ at various assumed pressures.

• Proceedings of the Petrological Society of Korea Conference
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• 2006.05a
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• pp.36-37
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• 2006

• Economic and Environmental Geology
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• v.36 no.4
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• pp.305-312
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• 2003

This study was performed to delineate the subsurface geology, geologic structure, and distribution pattern of the Palgongsan granitic body, and to reveal the relationship between the Kyeongsang basin and Yongnam massif by gravity survey. The study area is located between the latitude of 35$^{\circ}$45'-36$^{\circ}$21'N and longitude of 128$^{\circ}$15'-129$^{\circ}$00'E. Total of 966 gravity data measured by Seoul National University, KlGAM(Korea Institute of Geology, Mining ＆ Materials), Pusan National University and Yonsei University were used. The Bouguer gravity anomaly in the study area ranges from -12.88 to 26.01 mgal with a mean value of 11.27 mgal. A very low anomaly zone is located in the Yongnam massif in west of the study area. The anomaly value increases going from west to east. A low anomaly distribution in Palgongsan granite and Yongnam massif is interpreted as the effect of their lower density than that of Kyeongsang Super Group. Power spectrum analysis is applied to evaluate the average depth of basement the Kyeongsang Basin and Conrad discontinuity from gravity anomaly. The average depths of density discontinuities are calculated 10.45 km and 4.9 km, and these are interpreted as Conrad discontinuity and depth of basement of the Kyeongsang Basin, respectively. The depth of Palgongsan granite is derived by means of 2-dimensional modeling and it decreases gradually toward the east. The gravity anomaly east of the study area decreases abruptly due to Shingryeong fault and Nogosan ring fault. Two deepest and sharp roots of Palgongsan granite are recognized by 2-dimensional modeling of each profiles. The depths of those roots are 5.3 km on a profile AA' and 7 km on a profile BB' which is the maximum depth of Palgongsan granite. Small granitic bodies are also seen to be intruded around the Palgongsan granite. The root of Palgongsan granite is shown by 3-dimensional analysis based on the interpolation of 2-dimensional modeling along each profiles to exist in the southwest vicinity of Palgongsan granite. The total volume of Palgongsan granite is approximately 31.211 $Km^3$.

• Journal of the Korean Geotechnical Society
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• v.30 no.5
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• pp.25-35
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• 2014

The sedimentary rocks exposed around Mt. Palgong were subjected to metamorphism due to a granitic magma intrusion at late Cretaceous, and they eventually metamorphosed to hornfels by the action of both hydrothermal solution and high temperature supplied from the magma. The hornfels zone around the granite body ranges from 2.0 to 3.5 km in width but the boundary between hornfels and sedimentary rocks is not obviously defined because the metamorphic grade gradually decreases with distance from the granite boundary. A series of laboratory tests on 350 core specimens made by 35 fresh rock blocks obtained from 5 selected locations around Mt. Palgong are performed to verify the variation of physical and mechanical properties related to metamorphic grade of the rock. Water content and absorption ratio of the hornfels linearly increase with distance to the granite boundary whereas dry unit weight, p-wave velocity, point load strength, and slake durability index linearly decrease with the distance. These results imply that the metamorphic grade of the hornfels also linearly decrease with the distance to granite boundary. Empirical equations for the variation of properties with the distance to granite boundary and relationship between a property and another one are deduced by regression analyses. And a criteria for classification of hornfels exposed in the study area based on the P-wave velocity and point load strength is proposed.

• Journal of the Mineralogical Society of Korea
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• v.11 no.2
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• pp.97-105
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• 1998

Weathering of biotite in Palgonsan granite was studied by using X-ray diffraction, optical microscopy, scanning electron microscopy, and electron probe micro analysis. Biotite altered to biotite/vermiculite regular mixed layer mineral (B/V) in the early stage of weathering. Although partially replaced by kaolinite with the progress of weathering. B/V is the major weathering product of biotite throughout the profile. During the formation of B/V, Mg, Fe and K are removed from a biotite layer to form a vermiculite layer by about 28%, 44% and 88%, respectively, whereas the Ti content is not changed. Considerable volume increase after the kaolinitization of B/V suggests that Al and Si are largely introduced from the external weathering solution. The silicate lattice templet of a weathering biotite facilitated the nucleation and growth of kaolinite. In the Palgongsan granite weathering profile, plagioclase weathered mostly into halloysite whereas biotite greatly contributes to the kaolinite crystallization though its small content in fresh rock.