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首页> 外文期刊>Contributions to Mineralogy and Petrology >Interactions between dioritic and granodioritic magmas In mingling zones: plagioclase record of mixing, mingling and subsolidus interactions in the Gesiniec Intrusion, NE Bohemian Massif, SW Poland
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Interactions between dioritic and granodioritic magmas In mingling zones: plagioclase record of mixing, mingling and subsolidus interactions in the Gesiniec Intrusion, NE Bohemian Massif, SW Poland

机译：混杂区中闪长岩浆岩和花岗闪长岩岩浆之间的相互作用：波兰西南部波西米亚断层群Gesiniec侵入体的斜长石记录混合，混合和亚固相线相互作用

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Dioritic and granodioritic rocks coexist in the Gesiniec Intrusion in SW Poland showing typical relationships in many mafic-felsic mingling zones worldwide, such as dioritic syn-putonic dykes and microgranular enclaves within granodioritic host. Plagioclase zonation from granodioritic rocks suggests late stage mixing probably with dioritic magma, whereas no magma mixing is recorded in plagioclase from dioritic rocks. The diorites seem to show effects of interaction with evolved, leuco-cratic melts derived from granodiorite, not with the granodioritic melt itself. We conclude that the diorites' compositions were modified after their emplacement within the granodioritic host, when the diorites were essentially solidified and injection of evolved melt from granodiorite did not involve marked modification of plagioclase composition. Compositional zoning patterns of plagioclase in diorites can be modeled by closed system fractional crystallization interrupted by resorption induced probably by decompression. Granodioritic plagioclase seems to be affected by the same resorption event. Plagioclase that crystallized in dioritic magma before the resorption does not record interaction between dioritic and granodioritic magmas, suggesting that both magmas evolved separately.
机译：闪长岩和粒二闪岩共存于波兰西南部的Gesiniec侵入体中，显示出世界上许多镁铁质-长质质混杂区域的典型关系，例如，闪长岩体中的飞闪岩同生代代堤和微粒飞地。造粒岩中斜长石的带状化表明晚期混合可能与闪长岩浆有关，而从闪长岩的斜长石中没有记录到岩浆混合。闪长岩似乎显示出与衍生自花岗闪长岩的无色-克拉通熔体相互作用的效果，而不是与花岗闪长熔体本身的相互作用。我们得出的结论是，当重晶石基本凝固后，重晶石的组成在其进入花岗闪石主体中后即被改性，而从花岗闪石中注入的析出熔体并不涉及斜长石组成的明显改变。闪长岩中斜长石酶的组成分区模式可以通过闭合系统分数结晶来建模，该结晶可能被减压诱导的吸收中断。相同的再吸收事件似乎影响粒二化斜长石。在重吸收之前在闪长岩浆中结晶的斜长石浆未记录出闪长岩浆和粒长岩浆岩之间的相互作用，表明这两个岩浆是分别演化的。

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