Bryozoans (trepostomes and fenestellids) in the Zechstein Limestone (Wuchiapingian) of the North Sudetic Basin (SW Poland): palaeoecological implications.
Bryozoans (trepostomes and fenestellids) in the Zechstein Limestone (Wuchiapingian) of the North Sudetic Basin (SW Poland): palaeoecological implications.
复制标题
DOI：
10.7306/gq.1103
复制
发表时间：
2013-04
影响因子：
1
通讯作者：
U. Hara;M. Słowakiewicz;P. Raczyński
中科院分区：
文献类型：
--
作者：
U. Hara;M. Słowakiewicz;P. Raczyński
最近调查的Zechstein石灰岩（Ca1，Wuchiapingian）苔藓动物群从波兰部分的南二叠世盆地（西南波兰）占主导地位的体积和分类fenestellids。共鉴定出5属6种，包括属于Dycritella Girty，1911的2种，以及属于Kingopora Morozova，1970，Kalvariella Morozova，1970，Atriocladia King，1849和Spinofenestella Teratrium和Teratrium，1971的4种fenestellids。最大的苔藓动物的生物多样性在Ca1剖面研究是在斜坡相，其中大，扇形和漏斗形的网状fenestellid殖民地高达10厘米高占主导地位。与此相反，苔藓虫在边缘（近端）部分的盆地，主要包括trepostomes，代表的硬壳板状或线圈状的殖民地的Dycritella Girty，和常见的破碎的分支殖民地的Eschiocladia国王。苔藓虫生物组成的变化和存在的优势群体生长形式的地层剖面中的Ca1反映了沉积环境和水的能量。这些因素刺激了生物群及其定居的连续发展阶段，其特征是丰富的产品fenestellid组合，典型的近海设置，最大深度在格罗齐克向斜的Ca1的中部。Ca1上部（Leszczyna向斜）的近端风暴岩和前滨相终止了Ca1的沉积旋回，并残留有破碎的苔藓虫类，如Cyclocladia和fenestellids。分类组成，群体生长模式，相关的生物区系和沉积结构之间的关系指向缓慢的沉积速率上的斜坡和盆地底部的Ca1碳酸盐台地。在所研究的生物群中，以Spinofenestella、Kingopora、Kalvariella和Eschiocladia的网状和羽状菌落为主的fenestellids标志着与英国、德国和波罗的海南部地区的Zechstein（Ca 1）苔藓虫的密切古地理联系。
A recently investigated Zechstein Limestone (Ca1, Wuchiapingian) bryozoan fauna from the Polish part of the Southern Permian Basin (SW Poland) is dominated volumetrically and taxonomically by fenestellids. In total six species from five genera are recognized, comprising two species of trepostomes belonging to Dyscritella Girty, 1911 and four fenestellids attributed to Kingopora Morozova, 1970, Kalvariella Morozova, 1970, Acanthocladia King, 1849 and Spinofenestella Termier and Termier, 1971. The greatest biodiversity of the bryozoans in the Ca1 profiles studied is within the slope facies where large, fan-shaped and funnel-shaped reticulate fenestellid colonies up to 10 cm high dominate. In contrast, bryozoans in the marginal (proximal) parts of the basin mostly comprise trepostomes, represented by encrusting plate-like or coil-shaped colonies of Dyscritella Girty, and commonly broken branched colonies of Acanthocladia King. The changes in the biotic composition of the bryozoans and the presence of a dominant colony growth form in the stratigraphical profile of the Ca1 reflect the depositional environment and water energy. These factors stimulate the successive stages of the development of the biota and their settlement, marked by the rich productid-fenestellid assemblages typical of the offshore setting, with the maximum depth in the middle part of the Ca1 in the Grodziec Syncline. The proximal tempestites and foreshore facies of the upper part of the Ca1 (Leszczyna Syncline) terminate the sedimentary cycle of the Ca1, with the remnant, broken bryozoans of Acanthocladia and fenestellids. The relationship between the taxonomic composition, colony growth-patterns, associated biota, and sedimentary structures points to slow sedimentation rate on slope and basin floor of the Ca1 carbonate platform. The fenestellids which are dominated in the studied biota by the reticulate and pinnate colonies of Spinofenestella, Kingopora, Kalvariella and Acanthocladia mark a close palaeogeographical link with the Zechstein (Ca1) bryozoans of Great Britain, Germany and the southern Baltic region.