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Detrital zircon age data from the conglomerates in the Upper Silesian and Małopolska blocks, and their implications for the pre-Variscan tectonic evolution (S Poland)
Geological Quarterly ( IF 0.9 ) Pub Date : 2020-07-02 , DOI: 10.7306/gq.1539
Ryszard Habryn, Ewa Krzemińska, Leszek Krzemiński, Marek Markowiak, Grzegorz Zieliński

Detrital zircon age of the conglomerates from the Upper Silesian (USB) and Małopolska (MB) (S Poland) have been investigated to compare their deposition age and possible provenience. The size and poor sorting of the lithoclasts reflect a short transportation, with deposition close to the sourceland. The Late Ediacaran conglomerate of the Potrójna IG 1 and Raciechowice 1 boreholes (USB) reveal a good match between the ages known from the local basement explored by boreholes. Detrital zircon clusters in a range of 579–585 Ma and 628–638 Ma and of 707 Ma are consistent with the distributions of Cadomian magmatism within the nearest orogenic belt or those identified elsewhere within the Brunovistulicum. In case of the conglomerate deposited in the Batowice 2 borehole (MB), the zircon clusters of 532, 551, 594 and 649 Ma, accompanied with a pre-Svecofennian group peaked at 2071 Ma, and the lack of Sveconorvegian population may document a tectono-sedimentary interaction between the Baltica’s southern margin and the Gondwanan Cadomian and Late Cadomian basement during Early Paleozoic time. This conglomerate bed was deposited later, after the Early Ordovician, then docking of Małopolska Block – Baltica was probably completed.



中文翻译:

来自上西里西亚和Małopolska块体的碎屑锆石年龄数据,及其对瓦里斯坎前构造演化的影响(S波兰)

研究了上西里西亚(USB)和Małopolska(MB)(南波兰)的砾岩的碎屑锆石年龄,以比较它们的沉积年龄和可能的物源。破骨细胞的大小和分类不良反映了运输的短暂,沉积物靠近源地。PotrójnaIG 1和Raciechowice 1钻孔(USB)的晚期Ediacaran联合体揭示了从该钻孔勘探的当地地下室已知的年龄之间的良好匹配。碎屑锆石簇在579-585 Ma和628-638 Ma以及707 Ma范围内,与最近造山带内或布鲁诺维斯图库姆其他地方发现的卡多马岩浆岩分布一致。如果砾岩沉积在Batowice 2钻孔(MB)中,则锆石团簇为532、551、594和649 Ma,伴有前Svecofennian组在2071 Ma达到顶峰,并且缺乏Sveconorvegian人口可能证明了在古生代初期波罗的海南部边缘与冈瓦南卡多脉和晚卡多脉基底之间发生了构造-沉积作用。该聚集岩床在奥陶纪早期之后沉积,随后MałopolskaBlock – Baltica的对接可能已经完成。

更新日期:2020-08-20
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