Kivilompolo Mo mineralization in the Peräpohja belt revisited: Trace element geochemistry and Re-Os dating of molybdenite

IF 1.3 4区地球科学 Q2 GEOLOGY

Bulletin of the Geological Society of Finland Pub Date : 2020-12-15 DOI:10.17741/bgsf/92.2.004

J. Ranta, E. Hanski, H. Stein, Matthew Goode, T. Mäki, Atte Taivalkoski, Ballinteer Dublin D Hk Ireland Ballinteer Park, Tampere Finland Näsilinnankatu D

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引用次数: 4

Abstract

The Kivilompolo molybdenite occurrence is located in the northern part of the Perä poh ja belt, within the lithodemic Ylitornio nappe complex. It is hosted within a deformed porphyritic granite belonging to the pre-orogenic 1.99 Ga Kierovaara suite. The mineralization occurs mostly as coarse-grained molybdenite flakes in boudinaged quartz veins, with minor chalcopyrite, pyrite, magnetite, and ilmenite. In this study, we report new geochemical data from the host-rock granite and Re-Os dating results of molybdenite from the mineralization. For the whole-rock geochemistry, the mineralized granite is similar to the Kierovaara suite granites analyzed in previous studies. Also, the ca. 2.0 Ga Re-Os age for molybdenite is equal, within error, to the U-Pb zircon age of the Kierovaara suite granite. In addition, similar molybdenite and uraninite ages have been reported from the Rompas-Rajapalot Au-Co occurrence located 30 km NE of Kivilompolo. We propose that the magmatism at around 2.0 Ga ago initiated the hydrothermal circulation that was responsible for the formation of the molybdenite mineralization at Kivilompolo and the primary uranium mineralization associated with the Rompas-Rajapalot Au-Co occurrence or at least, the magmas provided heating, and in addition potentially saline magmatic fluids and metals from a large, cooling magmatic-hydrothermal system.

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重新考察Peräpohja带的Mo成矿作用:辉钼矿微量元素地球化学和Re-Os定年

Kivilompolo辉钼矿产状位于Peräpoh ja带的北部，在岩性Ylitornio推覆杂岩内。它位于造山前1.99 Ga Kierovaara岩套的变形斑状花岗岩中。矿化主要以粗粒辉钼矿薄片的形式出现在粗石英脉中，含少量黄铜矿、黄铁矿、磁铁矿和钛铁矿。在本研究中，我们报道了来自主岩花岗岩的新的地球化学数据和来自矿化的辉钼矿的Re-Os定年结果。就全岩地球化学而言，矿化花岗岩与先前研究中分析的Kierovaara套花岗岩相似。此外，辉钼矿的约2.0 Ga-Re-Os年龄在误差范围内等于Kierovaara套花岗岩的U-Pb锆石年龄。此外，据报道，位于Kivilompolo东北30公里处的Rompas Rajapalot Au Co矿点的辉钼矿和铀矿年龄相似。我们提出，大约2.0 Ga前的岩浆作用启动了热液循环，这是Kivilompolo辉钼矿矿化和与Rompas Rajapalot Au Co产状相关的原生铀矿化的原因，或者至少，岩浆提供了加热，此外，冷却岩浆热液系统。

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来源期刊

Bulletin of the Geological Society of Finland GEOLOGY-

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Bulletin of the Geological Society of Finland (BGSF) publishes research articles and short communications in all branches of geosciences. Contributions from outside Finland are welcome, provided that they contain material relevant to Finnish geology or are of general interest.