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Diagenetic albitization(Ab) of plagioclase(P) along cleavage planes. Note dissolution along cleavage planes(arrows). Cretaceous Haman Fm. Photo courtesy of Dr. JI Lee |
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Albite(dark gray) and calcite(light gray) replacement of K-feldspar (medium gray). You can see small remnant original plagioclase in right center of this sand-size grain in mudrock. Cretaceous Jeomgog Fm. Photo courtesy of Dr. JI Lee |
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Plagioclase albitization along grain margin. Faint oscillatory compositional zoning is observed. Within this plagioclase grain is observed calcite(light). Cretaceous Haman Fm. Photo courtesy of Dr. JI Lee |
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Plagioclase(P) albitization along microfractures. Albite overgrowth (Ab) and calcite cement(Cc) are also observed. Cretaceous Haman Fm. Photo courtesy of Dr. JI Lee |
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Albitization along microfracture (arrows) in plagioclase(P1). Albite overgrowth(Ab) and calcite cement and replacement are also observed. Cretaceous Haman Fm. Photo courtesy of Dr. JI Lee |
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Euheadral K-feldspar(K) and calcite(Cc) filling in fracture of mudrock Cretaceous Jeomgog Fm. Photo courtesy of Dr. JI Lee |
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Early micrite(light gray)-cemented sandstone. Note the brightness contrast between quartz(dark gray) and plagioclase(medium gray). The unaltered nature of plagioclase grains indicates that plagioclase albitization occurred during diagenesis, not in source area. Cretaceous Jinju Fm. Photo courtesy of Dr. JI Lee |
