Mineralogical Characteristics of Hydrothermal Laumontite and Adularia in the Breccia Zone of a Fault, Yangbuk-myeon, Gyeongju and Implications for Fault Activity

Choo, Chang Oh; Jang, Yun-Deuk; 장천중,

doi:10.9727/jmsk.2012.25.1.023

Cited by 3 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the Mujeong deposits (average 7.7‰; Kim et al ., ). These deposits were likely to have been affected by sulfur derived from the Tertiary volcanic rocks during the mineralization process through the faults commonly developed in the region (Kim et al ., ; Koh et al ., ; Choo et al ., ). The fault systems have played an important role in the hydrothermal activities within this region.…”

Section: Resultsmentioning

confidence: 97%

Sulfur Isotope Variations of Metallic Ore Deposits in the Gyeongsang Basin, South Korea

Shin

2015

Resource Geology

View full text Add to dashboard Cite

Many metallic ore deposits of the Late Cretaceous to Early Tertiary periods are distributed in the Gyeongsang Basin. Previous and newly analyzed sulfur isotope data of 309 sulfide samples from 56 ore deposits were reviewed to discuss the genetic characteristics in relation to granitoid rocks. The metallogenic provinces of the Gyeongsang Basin are divided into the Au-Ag(-Cu-Pb-Zn) province in the western basin where the sedimentary rocks of the Shindong and Hayang groups are distributed, Pb-Zn(-Au-Ag-Cu), Cu-Pb-Zn(-Au-Ag), and Fe-W(-Mo) province in the central basin where the volcanic rocks of the Yucheon Group are dominant, and Cu(-Mo-W-Fe) province in the southeastern basin where both sedimentary rocks of the Hayang Group and Tertiary volcanic rocks are present. Average sulfur isotope compositions of the ore deposits show high tendencies ranging from 2.2 to 11.7‰ (average 5.4‰) in the Pb-Zn(-Au-Ag-Cu) province, −0.7 to 11.5‰ (average 4.6‰) in the Cu-Pb-Zn(-Au-Ag) province, and 3.7 to 11.4‰ (average 7.5‰) in the Fe-W(-Mo) province in relation to magnetite-series granitoids, whereas they are low in the Au-Ag(-Cu-Pb-Zn) province in relation to ilmenite-series granitoids, ranging from −2.9 to 5.7‰ (average 1.7‰). In the Cu(-Mo-W-Fe) province δ 34 S values are intermediate ranging from 0.3 to 7.7‰ (average 3.6‰) and locally high δ 34 S values are likely attributable to sulfur derived from the Tertiary volcanic rocks during hydrothermal alteration through faults commonly developed in this region. Magma originated by the partial melting of the 34 S-enriched oceanic plate intruded into the volcanic rocks and formed magnetite-series granitoids in the central basin, which contributed to high δ 34 S values of the metallic deposits. Conversely, ilmenite-series granitoids were formed by assimilation of sedimentary rocks rich in organic sulfur that influenced the low δ 34 S values of the deposits in the western and southeastern provinces.

show abstract

Section: Resultsmentioning

confidence: 97%

Sulfur Isotope Variations of Metallic Ore Deposits in the Gyeongsang Basin, South Korea

Shin

2015

Resource Geology

View full text Add to dashboard Cite

show abstract

Estimation of Groundwater Level Fluctuation of the Crystalline site Using Time Series Analyses in South Korea

Lee¹,

Jung²,

Lee³

et al. 2013

Journal of the Nuclear Fuel Cycle and Waste Technology

View full text Add to dashboard Cite

This study is characterized the groundwater flow pattern near crystalline site of Yangbook-Myeon, Gyeongju City, South Korea. From the time series analyses, groundwater level could be classified into 4 types reflecting the hydrogeological characteristics and rainfall pattern. The type Ⅰ (DB1-1, DB1-2) may be directly influenced by rainfall pattern. The type Ⅱ (DB1-3, DB1-7, KB-1, KB-2, KB-3, KB-7, KB-14, KB-15) may be influenced by rainfall event as well as groundwater flow through water-conducting features. The type Ⅲ (DB-5, DB1-6, DB2-2, KB-10, KB-11, KB-13) may be predominantly happens in the crystaline rock mass, groundwater in this type flows through the minor fracture networks rather than direct effect of rainfall event. The type Ⅳ (DB1-8, KB-9) may be influenced by irregular variation of the groundwater level due to anisotropy and heterogeneity of crystalline rock.

show abstract

Chemical Behaviors of Elements and Mineral Compositions in Fault Rocks from Yangbuk-myeon, Gyeongju City, Korea

Song¹,

Choo²,

Chang³

et al. 2013

The Journal of the Petrological Society of Korea

Self Cite

View full text Add to dashboard Cite

This study is focused on element behaviors and mineral compositions of the fault rock developed in Yongdang-ri, Yangbuk-myeon, Gyeongju City, Korea, using XRF, ICP, XRD, and EPMA/ BSE in order to better understand the chemical variations in fault rocks during the fault activity, with emphasis on dependence of chemical mobility on mineralogy across the fault zone. As one of the main components of the fault rocks, SiO 2 shows the highest content which ranges from 61.6 to 71.0%, and Al 2 O 3 is also high as having the 10.8~15.8% range. Alkali elements such as Na 2 O and K 2 O are in the range of 0.22~4.63% and 2.02~4.89%, respectively, and Fe 2 O 3 is 3.80~12.5%, indicating that there are significant variations within the fault rock. Based on the chemical characteristics in the fault rocks, it is evident that the fault gouge zone is depleted in Na 2 O, Al 2 O 3 , K 2 O, SiO 2 , CaO, Ba and Sr, whereas enriched in Fe 2 O 3 , MgO, MnO, Zr, Hf and Rb relative to the fault breccia zone. Such chemical behaviors are closely related to the difference in the mineral compositions between breccia and gouge zones because the breccia zone consists of the rock-forming minerals including quartz and feldspar, whereas the gouge zone consists of abundant clay minerals such as illite and chlorite. The alteration of the primary minerals leading to the formation of the clay minerals in the fault zone was affected by the hydrothermal fluids

show abstract

Mineralogical Characteristics of Hydrothermal Laumontite and Adularia in the Breccia Zone of a Fault, Yangbuk-myeon, Gyeongju and Implications for Fault Activity

Cited by 3 publications

References 19 publications

Sulfur Isotope Variations of Metallic Ore Deposits in the Gyeongsang Basin, South Korea

Sulfur Isotope Variations of Metallic Ore Deposits in the Gyeongsang Basin, South Korea

Estimation of Groundwater Level Fluctuation of the Crystalline site Using Time Series Analyses in South Korea

Chemical Behaviors of Elements and Mineral Compositions in Fault Rocks from Yangbuk-myeon, Gyeongju City, Korea

Contact Info

Product

Resources

About