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首页> 外文期刊>Contributions to Mineralogy and Petrology >The age of Au-Cu-Pb-bearing veins in the poly-orogenic Ubendian Belt (Tanzania): U-Th-total Pb dating of hydrothermally altered monazite
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The age of Au-Cu-Pb-bearing veins in the poly-orogenic Ubendian Belt (Tanzania): U-Th-total Pb dating of hydrothermally altered monazite

机译：多造山带乌本斯地带（坦桑尼亚）中含Au-Cu-Pb的脉的年龄：水热蚀变独居石的U-Th-总铅定年

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摘要

The age of gold-copper-lead mineralization in the Katuma Block of the Ubendian Belt remains controversial because of the lack of radiometric ages that correlate with the age of tectonothermal events of this polyorogenic belt. Previous studies reported whole rock and mineral Pb-Pb ages ranging between 1,660 and 720 Ma. In this study, we report U-Th-total Pb ages of monazite from hydrothermally altered metapelites that host the Au-Cu-Pb-bearing veins. Three types of chemically and texturally distinct types of monazite grains or zones of grains were identified: monazite cores, which yielded a metamorphic age of 1,938 +/- 11 Ma (n = 40), corresponding to known ages of a regional metamorphic event, deformation and granitic plutonism in the be metamorphic overgrowths that date a subsequent metamorphic event at 1,827 +/- 10 Ma (n = 44) that postdates known eclogite metamorphism (at ca. 1,880 Ma) in the be hydrothermally altered poikilitic monazite, formed by dissolution-precipitation processes, representing the third type of monazite, constrain the age of a hydrothermal alteration event at 1,171 +/- 17 Ma (n = 19). This Mesoproterozoic age of the hydrothermal alteration coincides with the first amphibolite grade metamorphism of metasediments in the Wakole Block, which adjoins with a tectonic contact the vein-bearing Katuma Block to the southwest. The obtained distinct monazite ages not only constrain the ages of metamorphic events in the Ubendian Belt, but also provide a link between the metamorphism of the Wakole metasediments and the generation of the hydrothermal fluids responsible for the formation of the gold-copper-lead veins in the Katuma Block.
机译：由于缺乏与该多造山带的构造热事件年龄相关的放射线年龄，因此在乌本店地带的卡图马地块中金铜铅矿化的年龄仍然存在争议。先前的研究报道了整个岩石和矿物中Pb-Pb的年龄范围为1,660至720 Ma。在这项研究中，我们报告了由水热蚀变的变质岩中的独居石的U-Th-总Pb年龄，这些变质岩中含有Au-Cu-Pb的脉。确定了三种化学和结构上不同的独居石晶粒或晶粒区域类型：独居石芯，其产生的变质年龄为1,938 +/- 11 Ma（n = 40），对应于区域变质事件的已知年龄，变形带中的花岗岩成岩作用;变质过度生长，可追溯到随后的变质事件，发生时间为1,827 +/- 10 Ma（n = 44），该事件早于带中已知的榴辉岩变质（大约1,880 Ma）;由溶解-沉淀过程形成的代表第三种独居石的热液蚀变质独居石在1171 +/- 17 Ma（n = 19）时限制了热液蚀变事件的年龄。水热蚀变的中元古代时代与瓦科勒块中的沉积物的第一个闪石级变质相吻合，它与构造接触相毗邻，西南有带脉的卡图马块。获得的独特独居石年龄不仅限制了乌本甸地带的变质事件的年龄，而且提供了Wakole变质沉积的变质作用与负责形成金铜铅脉的热液的产生之间的联系。鹿沼地块。

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