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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Nature of feldspars in felsic plutonic complexes from northeastern Egypt: implications for the evolution of orogenic and anorogenic magmas
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Nature of feldspars in felsic plutonic complexes from northeastern Egypt: implications for the evolution of orogenic and anorogenic magmas

机译：埃及东北部长英古生岩复合体中的长石的性质：对造山带和造山带岩浆演化的影响

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摘要

Data on feldspars from orogenic to anorogenic complexes in eastern Egypt show the prominence of low albite in their perthitic lamellae. The structural state of feldspars reflects that the granodiorite-adamellite suite contains orthoclase, whereas samples from the leucogranite are represented by low microcline content. K-feldspar from the peralkaline granite is imperfectly ordered low microcline (its N_Or, values in the range 93.2-98.5 % indicate a range of closure temperatures between 400 and 150℃). Chilling of the peralkaline granites roof facies resulted in a relatively highly disordered K-feldspar in this unit. The metasomatized granite contains virtually end-member KA1Si_3O8, providing evidence of a closure temperature near 150°C. The prominence of low albite - low microcline suggests the presence of post-magmatic alkaline fluids promoting Al-Si ordering. The intrusion of the peralkaline granites cannot have been accompanied by a "regional" reheating, and its contact effects evidently were localized. The nature of feldspars was controlled in part by various physiochemical conditions prevailed during the crystallization of dry anorogenic, versus wet orogenic magmas. The results could have wide implications for the development of granites in various regions worldwide.
机译：埃及东部从造山带到造山带的长石的数据显示，低钠长石在其蠕虫层中突出。长石的结构状态反映出花岗闪长石-钠镁辉石套件包含正长石酶，而来自白云石的样品则以低微晶石含量表示。来自高碱性花岗岩的钾长石是不完全有序的低微晶（其N_Or，值在93.2-98.5％的范围内表示封闭温度在400至150℃之间）。高碱性花岗岩屋顶相的冷却导致该单元中钾长石的相对无序化。交代后的花岗岩实际上包含端基KA1Si_3O8，提供了封闭温度接近150°C的证据。低钠长石-低微斜面的突出表明存在岩浆后碱性流体，促进了Al-Si有序化。高碱性花岗岩的侵入不能伴随“区域性”再加热，并且其接触作用显然是局部的。长石的性质部分受干性成矿浆岩相对于湿成矿浆岩浆结晶过程中普遍存在的各种物理化学条件的控制。研究结果可能对世界各地不同地区的花岗岩开发产生广泛的影响。

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