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Structural evolution of continental and marine Permian rock salt of the North German Basin: constraints from microfabrics, geochemistry and U–Pb ages
International Journal of Earth Sciences ( IF 2.3 ) Pub Date : 2020-08-09 , DOI: 10.1007/s00531-020-01905-w
Mareike Henneberg , Jolien Linckens , Michael Schramm , Jörg Hammer , Axel Gerdes , Gernold Zulauf

Analyzing the dynamics of microstructural response on natural deformation in rock salt, we present microfabric, EBSD, geochemical and U–Pb data, obtained from Permian salt formations of the Kiel-Honigsee salt wall in Northern Germany. The samples were recovered from deep drillings, which penetrated through an overturned rock salt sequence of both Rotliegend and Zechstein deposits. The bromide concentration in halite indicates a continental and marine origin for the Rotliegend and Zechstein deposits, respectively. Despite intense deformation, relics of early diagenetic fabrics are still preserved. Deformation of the impure Rotliegend rock salt was accommodated by pressure solution and hydrofracturing as is indicated by the microfabrics and bromide concentration in halite. Fractures in siliciclastic domains were filled with fibrous halite and deformed by subgrain rotation recrystallization (SGR). Fluid-rich Zechstein rock salt, on the other hand, was deformed by formation of subgrains and grain boundary migration (GBM). The distribution of mineral phases and fluids had a significant impact on the fabric evolution and on strain localization. U–Pb dating of carbonate phases of the Rotliegend sequence yielded Permian depositional ages and Jurassic to Cretaceous deformation ages, the latter related to diapiric ascent. The combination of results traces a dynamic evolution of the rock fabric inside the diapir structure driven by locally active deformation processes that can be correlated with early stages of halite deposition and diagenesis and syntectonic fabric reorganization related to diapirism in an extensional setting.



中文翻译:

北德国盆地大陆和海洋二叠系岩盐的结构演化:受微结构,地球化学和U–Pb年龄的限制

通过分析岩盐中自然变形的微观结构动力学,我们提供了微织物,EBSD,地球化学和U-Pb数据,这些数据是从德国北部基尔-洪尼格西盐墙的二叠纪盐形成中获得的。样品是从深钻孔中回收的,这些钻孔穿透了Rotliegend和Zechstein矿床的翻转岩盐序列。岩盐中溴化物的浓度分别表示Rotliegend和Zechstein矿床的大陆和海洋起源。尽管变形剧烈,早期成岩织物的遗迹仍被保留。不纯净的Rotliegend岩盐的变形通过压力溶液和水力压裂来解决,正如微结构和盐岩中溴化物的浓度所表明的那样。硅质碎屑岩域的裂缝中充满了纤维状岩盐,并因亚晶粒旋转重结晶(SGR)而变形。另一方面,富含流体的Zechstein岩盐由于形成亚晶粒和晶界迁移(GBM)而变形。矿物相和流体的分布对织物的演变和应变局部化具有重要影响。Rotliegend序列的碳酸盐相的U–Pb测年产生了二叠纪的沉积年龄和侏罗纪至白垩纪的变形年龄,后者与二叠纪上升有关。

更新日期:2020-08-10
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