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首页> 外文期刊>International Journal of Earth Sciences >Reconstruction of the thermal history of the northwestern part of the Brunovistulicum
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Reconstruction of the thermal history of the northwestern part of the Brunovistulicum

机译：重建Brunovistulicum的西北部的热历史

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摘要

The eastern part of the European Variscan belt is exposed in the Bohemian Massif (BM). During the Variscan Orogeny, the Saxothuringian and Moldanubian BM units collided with the Brunovistulicum microcontinent. The western part of the Brunovistulicum is composed of Neoproterozoic crystalline rocks, occurring in four units: the Thaya Dome, the Svratka Dome, the Silesian Domain, and the Strzelin Massif, the northernmost exposed part of the Brunovistulicum. Another newly recognized Brunovistulicum subunit is the Drosendorf Unit in Austria. During the Variscan orogeny, the rocks of these units have been reworked to variable degree. The article presents new SHRIMP U-Pb ages which were obtained for three samples: N24-the sillimanite-bearing Nowolesie gneiss, affected by migmatization I; SK 1P-a pegmatite produced during migmatization II, and SK3-a dyke cross-cutting migmatized gneisses. These new data supplement already published zircon ages of the Neoproterozoic gneisses and the Variscan granitoids. Based on these data, this article documents the thermal-tectonic history of the Strzelin Massif during the 600-280 Ma timespan. The Neoproterozoic (Ediacaran) stage lasted about 30 Ma (600-570 Ma). There is no evidence for those thermal events which might have occurred between the Late Neoproterozoic and the Mid Devonian. The Variscan thermal history occurred from 350 to 280 Ma. Metamorphic changes started after the collision of the Bohemian Massif and the Brunovistulicum. The main thermal events are documented by two stages of migmatization, at 335 Ma and 305 Ma, respectively, and three stages of granitoid magmatism: ca. 324 Ma, ca. 306-303 Ma, and ca. 295-283 Ma. Compared with other structural units of the western part of the Brunovistulicum, the major peculiarities of the geology of the Strzelin Massif are: (1) klippen of the Saxothuringian rocks on top of rocks of the Brunovistulicum; (2) medium and low pressure metamorphism; (3) two stages of migmatization; (4) presence of a thermal dome; (5) long-lasting granite magmatism; (6) repeated intrusions of small volume, geochemically diverse magmas, controlled by faults and cracks.
机译：欧洲瓦里昔风带的东部部分暴露在波希米亚块（BM）中。在Variscan Orogeny期间，Saxothurathian和摩尔丹邦BM单位与黑暗的微大学相撞。 Brunovistulicum的西部由Neoproterozoic晶体岩石组成，以四个单位发生：Thaya圆顶，Svratka圆顶，Silesian结构域和Strzelin Massif，北方的布鲁诺犬暴露部分。另一个新公认的Brunovistulicum亚基是奥地利的Drosendorf股。在Variscan Orogeny期间，这些单元的岩石已经重新加工到可变程度。本文介绍了新的虾U-Pb年龄，用于三个样品：N24-含有Migmatization的含有Migmatization的富含硅酸盐的型号植物; SK 1P-A在Migmatization II期间产生的PEGMATITE，以及SK3-A堤防横切型异形。这些新的数据补充已经公布了锆新古代片和瓦氏腺癌的锆石。基于这些数据，本文在600-280 mA时间母羊期间记录了串的热构造历史。 Neoproterozoic（EdiaCaran）阶段持续约30 mA（600-570 mA）。在晚期新蛋白古代和中德农岛之间可能发生的那些热事件没有证据。大景热历史发生在350至280 mA。在波希米亚肿块和布鲁诺维主义的碰撞之后开始变质变化。主要热事件分别在335 mA和305 mA的335 mA和305 mA的两个阶段记录，以及花岗岩岩浆的三个阶段：CA。 324马，加利福尼亚州。 306-303 MA和CA。 295-283 mA。与Brunovistulicum的西部其他结构单元相比，Strzelin MaseIf的地质的主要特点是：（1）萨克洛汀的Klippen岩石在黑暗的岩石上的岩石上; （2）中低压变质; （3）削弱的两个阶段; （4）热圆顶的存在; （5）持久的花岗岩岩浆作用; （6）重复的小体积，地球化学多样化的岩浆，受故障和裂缝控制的。

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