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According to the experimental results of Watson (1978), and Ryerson and Hess (1980), pertaining to the distribution of trace elements between basic and acidic liquids in the temperature above magmatic liquidus, and the investigation of Webster (1997) on the melt inclusion in pegmatitic quartz from Ehrenfriedersdorf ore district, Germany, it should be drawn that there probably exists the liquid immiscibility in the early stage of pegmatitic evolution, due to the perphosphorus content in the magmatic systems. The perphosphorus feature of the melt is of great impact on the petrogenesis and matellogenesis of pegmatites.
1997对德国Ehrenfriedersdorf矿区伟晶岩石英中熔体包裹体的研究成果,我们推断在富磷岩浆体系中,在其演化的早期将出现由磷引起的液相不混溶作用,它对伟晶岩成岩和Be的成矿具有重大的影响。
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They are most abundant in quartz of pegmatitic leucosomes and granitic rocks, and represent the fluid appearing in their cooling stage. The DL(H2O) of such fluid is 0.93~0.96g/cm3 corresponding to P≈0.6GPa which is compatible with condition when the rapid decompression in this region was ended. 3 CO2-H2O two or three phases inclusions. They are the most widespread, and more frequently in clusters and in intragranular tails in quartz. The relative content of CO2+CH4 and H2O is considerably variable. They are also characterized with lower density (0.6~0.8g/cm3) and low pressure about 0.3~0.4GPa, and may be originated by mixture of carbonic liquid from breaking of most inclusions of peak stage and aqueous liquid of magmatic source. After entrapment, the further decrease of temperature to lower than 330℃ made such fluid separated to two or three phases.
主要集中于伟晶质脉体和花岗岩中,是这期岩浆冷凝过程析出的流体相当时就被封闭所成,密度为0.93~0.96g/cm3,相应压力约0.6GPa,这与峰期后迅速减压过程结束时的条件相符。3CO2-H2O两相和多相包体,分布最广,成簇状和拖尾状包体群,碳质和H2O相对含量很不均匀,整体密度相对最低,一般为0.6~0.8g/cm3,相应压力为0.3~0.4GPa,它们可能是大幅度减压过程中第一类包体大量爆裂析出的碳质流体与第二类H2O溶液流体在各处以不同比例混溶所成,它们被封闭后在降温至330℃以下时分裂成两相或三相包体。
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The average contents of phosphrus in alkali feldspars in both comb zone and the first intermediate zone are high, in the range of 0.42-0.22wt%, and gradually increase from 0.21wt% to 0.50wt% as the magma evolves from the third intermediate zone to the core zone. The abnormally low content of phosphrus (<0.10wt%) in alkali feldspar from the saccharoidal albite zone is considered due to the crystallization of apatites, which gives rise to extreme depletion of phosphrus in residual melt.
阿尔泰3号伟晶岩脉梳状结构带和Ⅰ带的碱性长石具较高P含量(平均值分别为0.42wt%和0.22wt%),随着岩浆的演化进行,从Ⅲ带到核部带,碱性长石中P含量逐渐增大(平均值由0.21wt%增至0.50wt%),而Ⅱ带碱性长石中异常低的P含量(平均值为0.08wt%)是该带大量磷灰石矿物饱和结晶,导致残余熔体相中P极度亏损所造成的,而不是晚期出溶的岩浆热液交代形成的。
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asthenolith:溶岩浆体
asthenogenia | 衰弱发生 | asthenolith | 溶岩浆体 | asthenope | 患弱视症的人
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intersertal:填隙的
填入岩浆 permissive magma | 填隙的 intersertal | 填隙固溶体 interstitial solid solution