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Lower Kimmeridgian facies and sedimentary succession of a shallow-water coated-grain-dominated carbonate ramp of the northern peri-Tethyan shelf: an example from the Radomsko Folds (central Poland)
Geological Quarterly ( IF 0.9 ) Pub Date : 2020-10-27 , DOI: 10.7306/gq.1563
Piotr OLCHOWY , Marcin KRAJEWSKI

An Upper Jurassic succession is exposed in the active Rogaszyn Quarry (Kodrąb area) located in the Radomsko Folds structure (central Poland). Six facies types were distinguished, comprising oolitic, oncolitic, biodetrital and pelitic limestones as well as marls and marly clays. Typical lithologies are limestones with coated grains deposited in shallow-water, fore-shoal, shoal and lagoonal parts of a carbonate ramp. Three types of ooid and three types of oncoid were identified, which display several shapes and sizes, and a complex structure of cortices. The ooid types show micritic, radial-fibrous and mixed, micritic/radial-fibrous cortices. Type 1 oncoids comprise micritic or bioclastic nuclei enveloped by non-laminated or laminated micritic cortices. Type 2 oncoids are composed of micritic or bioclastic nuclei and laminated, fossil-bearing cortices covered by microbial envelopes. Type 3 oncoids are the largest of the oncoids observed, attaining cm-scale dimensions. These oncoids are formed of a Bacinella-dominated meshwork incorporating smaller ooids and oncoids, or they have bioclastic or micritic nuclei covered by complex cortices with micritic, laminated, fossil-bearing, Bacinella-dominated fabric and microbial envelopes. Boundaries between the specific types of cortical envelopes are usually sharp and accentuated by organic encrustations, elongated bioclasts or borings. Commonly found are chambers of the ichnogenus Entobia representing the boring traces of carbonate-excavating sponges and the cryptoendolithic foraminifer Troglotella incrustants . The complex cortices indicate different growth stages of oncoids at different conditions of currents and microbial activity. Carbonate deposition was accompanied by mixed siliciclastic-carbonate sedimentation resulting in multiple intercalated layers of marls and pelitic limestones as well as marly clays. The deposits exposed in the Rogaszyn Quarry as well as in the Kodrąb area are compared with the neighbouring Upper Jurassic deposits of the Szczercow area and the SW margin of the Holy Cross Mts. (both central Poland). The successions from the Kodrąb area are generally similar to the Lower Kimmeridgian sequences known from adjacent areas, but with locally observed facies variability.

中文翻译:

北特提斯大陆架北部浅水包覆颗粒为主的碳酸盐斜坡的下金米里阶相和沉积序列:以拉多姆斯科褶皱(波兰中部)为例

位于 Radomsko 褶皱构造(波兰中部)的活跃 Rogaszyn 采石场(Kodrąb 地区)出露上侏罗纪系列。区分了六种相类型,包括鲕粒灰岩、粘粒灰岩、生物碎屑灰岩和泥质灰岩以及泥灰岩和泥灰质粘土。典型的岩性是沉积在碳酸盐斜坡浅水、前滩、浅滩和泻湖部分的带有涂层颗粒的石灰岩。确定了三种类型的 ooid 和三种类型的 oncoid,它们具有多种形状和大小,以及复杂的皮质结构。ooid 类型显示泥质、放射状纤维和混合、泥质/放射状纤维皮质。1 型类瘤包括被非层状或层状泥质皮质包裹的泥质或生物碎屑核。2 型类瘤由泥晶或生物碎屑核和层状组成,被微生物包膜覆盖的带有化石的皮质。3 类肿瘤是观察到的最大类肿瘤,达到厘米级尺寸。这些类瘤是由芽孢杆菌主导的网状结构形成的,其中包含较小的 ooids 和 oncoid,或者它们具有被复杂皮质覆盖的生物碎屑或泥晶核,具有泥晶、层状、含化石、以芽孢杆菌为主的织物和微生物包膜。特定类型的皮层包膜之间的边界通常是尖锐的,并被有机结壳、拉长的生物碎屑或钻孔所突出。常见的是 ichnogenus Entobia 的腔室,它们代表了挖掘碳酸盐的海绵和隐石内有孔虫 Troglotella incrustants 的无聊痕迹。复杂的皮质表明在不同的电流和微生物活动条件下类癌的不同生长阶段。碳酸盐沉积伴随着混合硅质碎屑-碳酸盐沉积,导致泥灰岩和泥质灰岩以及泥灰质粘土的多个夹层。Rogaszyn 采石场和 Kodrąb 地区出露的矿床与邻近的 Szczercow 地区的上侏罗纪矿床和圣十字山西南边缘进行了比较。(波兰中部)。Kodrąb 地区的层序与从邻近地区已知的下基默里吉阶序列大体相似,但具有局部观察到的相变异性。碳酸盐沉积伴随着混合硅质碎屑-碳酸盐沉积,导致泥灰岩和泥质灰岩以及泥灰质粘土的多个夹层。Rogaszyn 采石场和 Kodrąb 地区出露的矿床与邻近的 Szczercow 地区的上侏罗纪矿床和圣十字山西南边缘进行了比较。(波兰中部)。Kodrąb 地区的层序与从邻近地区已知的下基默里吉阶序列大体相似,但具有局部观察到的相变异性。碳酸盐沉积伴随着混合硅质碎屑-碳酸盐沉积,导致泥灰岩和泥质灰岩以及泥灰质粘土的多个夹层。Rogaszyn 采石场和 Kodrąb 地区出露的矿床与邻近的 Szczercow 地区的上侏罗纪矿床和圣十字山西南边缘进行了比较。(波兰中部)。Kodrąb 地区的层序与从邻近地区已知的下基默里吉阶序列大体相似,但具有局部观察到的相变异性。
更新日期:2020-10-27
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