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首页> 外文期刊>Brazilian Journal of Geology >Petrogenesis and U-Pb and Sm-Nd geochronology of the Taquaral granite: record of an orosirian continental magmatic arc in the region of Corumba - MS
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Petrogenesis and U-Pb and Sm-Nd geochronology of the Taquaral granite: record of an orosirian continental magmatic arc in the region of Corumba - MS

机译：Taquaral花岗岩的岩石成因，U-Pb和Sm-Nd年代学：在Corumba地区的奥里西期大陆岩浆弧记录-MS

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The Taquaral Granite is located on southern Amazon Craton in the region of Corumbá, westernmost part of the Brazilian state of Mato Grosso do Sul (MS), near Brazil-Bolivia frontier. This intrusion of batholitic dimensions is partially covered by sedimentary rocks of the Urucum, Tamengo Bocaina and Pantanal formations and Alluvial Deposits. The rock types are classified as quartz-monzodiorites, granodiorites, quartz-monzonites, monzo and syenogranites. There are two groups of enclaves genetically and compositionally different: one corresponds to mafic xenoliths and the second is identified as felsic microgranular enclave. Two deformation phases are observed: one ductile (F1) and the other brittle (F2). Geochemical data indicate intermediate to acidic composition for these rocks and a medium to high-K, metaluminous to peraluminous calk-alkaline magmatism, suggesting also their emplacement into magmatic arc settings. SHRIMP zircon U-Pb geochronological data of these granites reveals a crystallization age of 1861 ± 5.3 Ma. Whole rock Sm-Nd analyses provided εNd(1,86 Ga) values of -1.48 and -1.28 and TDM model ages of 2.32 and 2.25 Ga, likely indicating a Ryacian crustal source. Here we conclude that Taquaral Granite represents a magmatic episode generated at the end of the Orosirian, as a part of the Amoguija Magmatic Arc.
机译：Taquaral花岗岩位于Corumbá地区的Amazon Craton南部，该州是巴西南马托格罗索州（MS）最西端，靠近巴西-玻利维亚边境。这种岩性尺寸的侵入被Urucum，Tamengo Bocaina和Pantanal地层以及冲积层的沉积岩部分覆盖。岩石类型分为石英单闪闪岩，花岗闪长岩，石英单闪长岩，单晶和正花岗岩。在遗传上和组成上有两组不同的飞地：一组对应于镁铁质异种岩，另一组被确定为长英质微颗粒飞地。观察到两个变形阶段：一个是延性（F1），另一个是脆性（F2）。地球化学数据表明，这些岩石为中等至酸性成分，中等至高K，金属至高铝的cal碱岩浆，也表明它们已进入岩浆弧环境。这些花岗岩的SHRIMP锆石U-Pb年代学数据显示其结晶年龄为1861±5.3 Ma。整个岩石的Sm-Nd分析提供的εNd（1,86 Ga）值为-1.48和-1.28，TDM模型年龄为2.32和2.25 Ga，可能表明是Ryacian地壳来源。在这里，我们得出的结论是，Taquaral花岗岩代表了Orosirian末期产生的岩浆事件，是Amoguija岩浆弧的一部分。

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