花崗岩組織の研究 : とくに石英について

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Quartz in granites is generally grasped on two textural units, 1) quartz-grain as individual crystals distinguished from each other by high-angle boundaries, and 2) quartz-pool as individual domains occupied only by quartz and bounded by other minerals than quartz. In this paper textural significances of quartz-grain and qualtz-pool have been examined on the basis of analyses of quartz fabrics of the Yagyu granite of the Ryoke metamorphic belt (=mesozone granite), the Hata granite of the Hiroshima belt (=epizone granite), the Tamagawa granite of the Tamagawa belt (=epizone granite) and the Omogo granite of the Outer zone of Southwest Japan (=epizone granite). It has been clarified that the quartz-pool is initial fabric of magmatic origin and was initially occupied by one grain of quartz and that the quartz-grain is secondary recrystallized grain produced during solid-state flow (=solid intrusition) of granite or by regional tectonic stress. The contact ratio of quartz-pools in granite is commonly about O.05 (see the definition of grain-contact ratio by J. J. W. ROGERS et al., 1958 and P. KRETZ 1969), regardless of granite types, indicating that the primary distribution pattern of quartz in granite is essentially similar to each other regardless of granite types. The quartz-pools in eplozone and mesozone granites consist commonly of many quartz-grains, indicating that the granites were deformed by solid intrusion and/or regional tectonic stress during cooling.
日本地質学会の論文
1979-09-20

花崗岩組織の研究 : とくに石英について

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