Bryozoan distribution and growth form associations as a tool in environmental interpretation, Tasmania, Australia
Bryozoan distribution and growth form associations as a tool in environmental interpretation, Tasmania, Australia
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DOI：
10.1016/j.sedgeo.2004.01.010
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发表时间：
2004-05-01
影响因子：
2.8
通讯作者：
Quilty, PG
中科院分区：
文献类型：
--
作者：
Amini, ZZ;Adabi, MH;Quilty, PG
塔斯马尼亚岛东部和西部以及巴斯海峡的冷温带碳酸盐沉积物由29-50%的苔藓虫骨骼颗粒组成。对塔斯马尼亚岛附近283个苔藓动物沉积物进行了研究，以确定苔藓动物的虫型组合与其深度带的关系。苔藓虫骨骼分为II形态型根据架构和风格的脱节/碎片。包壳形式，直立灵活（cellariiform）和直立-刚性-粗壮-分支（adeoniform）cheilostomes始终是最广泛的，与微妙的分支圆口其次最常见。生长型协会被分为四个深度相关的设置：链线，浅货架，中间货架和深货架。这项研究表明，苔藓虫的形态型协会，占据不同的深度带，是有价值的提供基础（古）环境信息。形态组合主要与水深、水能量、沉积速率和底质有关，在滨岸带背景下，结壳单层和直立-柔性-铰接-分枝丰富，而在浅海陆棚中，结壳单层和直立-柔性-铰接-分枝丰富。直立-柔性、结壳-多层、直立-刚性-粗壮、窗状和细枝是主要的生长形式。上述关联表明高到中等能量水平、中等到高沉降速率和柔性到硬质基质。在中部陆架区，直立-刚性-开窗，健壮和微妙的分支唇口类和圆口类是最常见的生长形式。这些协会表明降低水的能量，较低的沉降速率和存在稳定的硬到软的基板。在深陆架环境中，直立-坚硬-坚固、窗状和叶状形态的优势表明深水静水、低沉积速率和硬底质。(C)2004 Elsevier B.V保留所有权利。
The cool temperate carbonate sediments of eastern and western Tasmania and Bass Strait composed of 29-50% of bryozoan skeletal grains. Two hundred and eighty three bryozoan bulk sediments around Tasmania were studied to determine the relationship between bryozoan zoarial growth form association and their depth zone. Bryozoans skeletons are grouped into I I morphotypes according to architecture and style of disarticulation/fragmentation. Encrusting forms, erect flexible (cellariiform) and erect-rigid-robust-branching (adeoniform) cheilostomes are consistently the most widespread, with delicate branching cyclostomes the next most common. Growth form associations were grouped into four depth-related settings: strand line, shallow shelf, middle shelf and deep shelf. This study demonstrates that bryozoan morphotype associations, occupying different depth zones, are valuable for providing fundamental (paleo-) environmental information. Morphotype associations are related mainly to water depth, water energy, sedimentation rate and substrate.In the strand line setting encrusting unilaminar and erect-flexible-articulated-branching are abundant, while in the shallow shelf. erect-flexible, encrusting-multilaminar, erect-rigid-robust, fenestrate and delicate-branching are major growth forms. The above associations indicate high to moderate energy levels, moderate to high sedimentation rates and flexible to hard substrates. In middle shelf areas, erect-rigid-fenestrate, robust and delicate-branching cheilostomes and cyclostomes are the most common growth forms. These associations indicate decreasing water energy, lower sedimentation rate and presence of stable hard to soft substrates. In the deep shelf setting, the dominance of erect-rigid-robust, fenestrate and foliose forms indicate deep quiet water, low sedimentation rate and hard Substrate. (C) 2004 Elsevier B.V All rights reserved.