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首页> 外文期刊>Brazilian Journal of Geology >Geochemistry of the Serra das Melancias Pluton in the Serra da Aldeia Suite: a classic post-collisional high Ba-Sr granite in The Riacho do Pontal Fold Belt, NE Brazil
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Geochemistry of the Serra das Melancias Pluton in the Serra da Aldeia Suite: a classic post-collisional high Ba-Sr granite in The Riacho do Pontal Fold Belt, NE Brazil

机译：Serra da Aldeia套房中Serra das Melancias Pluton的地球化学：巴西东北部Riacho do Pontal褶皱带的经典碰撞后高Ba-Sr花岗岩

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摘要

The Serra da Aldeia Suite is composed by circular or oval-shaped plutons, intrusive in meta-sedimentary and meta-volcanosedimentary rocks in the Riacho do Pontal Fold Belt, NE Brazil. The Serra das Melancias Pluton, belonging to Serra da Aldeia Suite, is located southeastern of Piaui state, near Paulistana city. These plutons represent a major magmatic expression in this area and contain important information about the late magmatic/collisional geologic evolution of the Brasiliano Orogeny. Based on petrographic and geochemical data, three facies were defined in the Serra das Melancias Pluton: granites, syenites and quartz monzonites. The rocks display high-K and alkaline to shoshonitic affinities, are metaluminous and show ferrous character. They are enriched in Light Rare Earth Elements and Large Ion Lithophile Elements, with negative anomalies in Nb, Ta and Ti. Their high Ba, Sr, K/Rb, low Rb, relatively low U, Th, Nb to very low Heavy Rare Earth Elements and Y resemble those of typical high Ba-Sr granitoids. The geochemical data suggest the emplacement of Serra das Melancias Pluton in a transitional, late to post-orogenic setting in the Riacho do Pontal Fold Belt during the late Brasiliano-Pan African Orogeny.
机译：Serra da Aldeia Suite由圆形或椭圆形的小行星组成，侵入巴西东北部Riacho do Pontal Fold Belt中的准沉积和准火山成岩。属于Serra da Aldeia Suite的Serra das Melancias Pluton位于Piaui州东南，靠近Paulistana市。这些岩体代表了该地区的主要岩浆表达，并包含有关Brasiliano造山带后期岩浆/碰撞地质演化的重要信息。根据岩石学和地球化学数据，在Serra das Melancias Pluton中定义了三个相：花岗岩，正长岩和石英蒙脱石。这些岩石显示出高K和碱金属到钾铁矿的亲和力，是金属元素，并表现出亚铁特性。它们富含轻稀土元素和大型离子亲脂性元素，而Nb，Ta和Ti呈负异常。它们的高Ba，Sr，K / Rb，低Rb，相对低的U，Th，Nb到非常低的重稀土元素和Y类似于典型的高Ba-Sr花岗岩。地球化学数据表明，在巴西利亚-泛非造山带晚期，Riacho do Pontal褶皱带的Serra das Melancias Pluton处于过渡的，晚到造山后的环境中。

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