초록

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Abstract ▼ AI-Helper

We report zircon morphology of granitoids in the Mt. Keumjeong district, Pusan. There are a series of granitoids in the study area of the late Cretaceous: granodiorite, hornblende granite, adamellite, tonalite, biotite granite, and micrographic granite. Generally, the shapes of zircon crystals are s...

We report zircon morphology of granitoids in the Mt. Keumjeong district, Pusan. There are a series of granitoids in the study area of the late Cretaceous: granodiorite, hornblende granite, adamellite, tonalite, biotite granite, and micrographic granite. Generally, the shapes of zircon crystals are short prismatic to middle prismatic and are dominant in {loo) prism and {101) pyramid in total average morphological data of the granitoids. The crystal forms of zircon in the granitoids can be distinguished by the PPEF diagram and the prism index (PI). The prism index values of zircon crystal forms in granodoirite and hornblende granite are higher than those of tonalite and micrographic granite. The finishing temperature range ($820~800^{\circ}C$) for crystallization of zircon crystals in granodoirite and hornblende granite is higher than the temperature ($790~770^{\circ}C$) at which the zircon crystals are created in tonalite and micrographic granite. The last differentiates (biotite granite and micrographic granite) have mainly intermediate zircon ({110)={100)) crystals, respectively. As differentiation proceeds, the zircons of granitoids become from short prismatic to middle prismatic in the each granitoid types.

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