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Zeolitization of the Dacitic Tuff in the Miocene Janggi Basin, SE Koreaopen access

Authors
Kim, JinjuJeong, Jong OkShinn, Young-JaeSohn, Young Kwan
Issue Date
Feb-2022
Publisher
KOREA SOC ECONOMIC & ENVIRONMENTAL GEOLOGY
Keywords
tuff; mordenite; clinoptilolite; zeolitization
Citation
ECONOMIC AND ENVIRONMENTAL GEOLOGY, v.55, no.1, pp 63 - 76
Pages
14
Indexed
SCOPUS
ESCI
KCI
Journal Title
ECONOMIC AND ENVIRONMENTAL GEOLOGY
Volume
55
Number
1
Start Page
63
End Page
76
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/1687
DOI
10.9719/EEG.2022.55.1.63
ISSN
1225-7281
2288-7962
Abstract
Dacitic tuffs, 97 to 118 m thick, were recovered from the lower part of the subsurface Seongdongri Formation, Janggi Basin, which was drilled to assess the potential for underground storage of carbon dioxide. The tuffs are divided into four depositional units(Unit 1 to 4) based on internal structures and particle componentry. Unit 1 and Units 3/4 are ignimbrites that accumulated in subaerial and subaqueous settings, respectively, whereas Unit 2 is braided-stream deposits that accumulated during a volcanic quiescence, and no dacitic tuff is observed. A series of analysis shows that mordenite and clinoptilolite mainly fill the vesicles of glass shards, suggesting their formation by replacement and dissolution of volcanic glass and precipitation from interstitial water during burial and diagenesis. Glass-replaced clinoptilolite has higher Si/Al ratios and Na contents than the vesicle-filling clinoptilolite in Units 3. However, the composition of clinoptilolite becomes identical in Unit 4, irrespective of the occurrence and location. This suggests that the Si/AI ratio and pH in the interstitial water increased with time because of the replacement and leaching of volcanic glass, and that the composition of interstitial water was different between the eastern and western parts of the basin during the formation of the clinoptilolite in Units 1 and 3. It is also inferred that the formation of the two zeolite minerals was sequential according to the depositional units, i.e., the clinoptilolite formed after the growth of mordenite. To summarize, during a volcanic quiescence after the deposition of Unit 1, pH was higher in the western part of the basin because of eastward tilting of the basin floor, and the zeolite ceased to grow because of the closure of the pore space as a result of the growth of smectite. On the other hand, clinoptilolite could grow in the eastern part of the basin in an open system affected by groundwater, where braided stream was developed. Afterwards, Units 3 and 4 were submerged under water because of the basin subsidence, and the alkali content of the interstitial water increased gradually, eventually becoming identical in the eastern and western parts of the basin. This study thus shows that volcanic deposits of similar composition can have variable distribution of zeolite mineral depending on the drainage and depositional environment of basins.
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자연과학대학 (지질과학과)
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