Crystalization Characteristics and Genesis of the Zircon Group in Intermediate-Acid Intrusive Rocks of Tongling Area
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P588.12

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    Abstract:

    The corrosion holes on the crystal faces of zircon from the Mesozoic intermediate-acid intrusive rocks of Tongling area resulted from the rising temperature caused by heat or latent heat of crystallization arising from upward intrusion of deep magma after the crystallization of zircon. Statistics of zircon crystal faces show asymmetric normal and asymmetric lognormal distribution patterns noted for unimodal, bimodal and hyperbolic forms, and there exists the association of different crystal forms of zircon which belong to different end-member zircon groups in the same intrusive body, suggesting the hybridization of different genetic types of magma. The crystallization temperatures of different types of rocks as shown by statistics of zircon crystal faces are in the range of 900-700℃; for pyroxene monzodiorite, 850-650℃ for quartz monzodiorite, 800-650℃ for granodiorite,and 650-600℃ for granodiorite porphyry respectively. Studies of magma physics have shown that the composition,crystalline state and temperature of magma decided the viscosity of magma, which,in turn, conditioned the development of different zircon crystal faces in intermediate-acid intrusive rocks. For example, the high viscosity of granodiorite was favorable for the development of(311) face while the low viscosity of pyroxene monzodiorite for that of(111)face. The correlogram between the average alkalinity index and the average temperature index of zircon demonstrates that magmatic materials responsible for the intermediate- acid intrusive rocks in the area were derived from the mantle-crust mixtures.

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吴才来,周珣若,黄许陈,张成火,1994,铜陵地区中酸性侵入岩锆石群结晶特征及成因[J].岩石矿物学杂志,13(3):239~247. Wu Cailai, Zhou Xunruo,1994,Crystalization Characteristics and Genesis of the Zircon Group in Intermediate-Acid Intrusive Rocks of Tongling Area[J]. Acta Petrologica et Mineralogica,13(3):239~247.

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