...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Sedimentary geology >Carbonate production and deposition in a warm-temperate macroalgal environment, Investigator Strait, South Australia
【24h】

Carbonate production and deposition in a warm-temperate macroalgal environment, Investigator Strait, South Australia

机译：温带大型藻类环境中碳酸盐的产生和沉积，南澳大利亚研究者海峡

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The prolific macroalgal forests in shallow (<20 m), warm-temperate, marine environments off southern Yorke Peninsula, South Australia have two carbonate-producing habitats, 1) upward-facing, exposed rock surfaces beneath large phaeophytes, and 2) concealed rock surfaces under overhangs, on rock walls, in crevasses, and indentations that all lie behind a curtain of brown macroalgae. Exposed surfaces have three growth tiers; 1) a basal, cm-high veneer or turf of crustose corallines, geniculate corallines, and short fleshy red algae that are grazed by herbivorous gastropods, 2) an intermediate, 5-20 cm-high community of fleshy red algae, and 3) a 20-100 cm+-high canopy of large phaeophytes (especially Ecklonia, Cystophora and Xiophora) whose blades are locally encrusted with bryozoans, such as Membranipora membranacea, and spirorbids. Concealed surfaces of subvertical rock walls and cryptic habitats behind the macroalgal curtain have two tiers; 1) a cornucopia of encrusting plants and animals, especially crustose and geniculate corallines in shallow water, that give way in water depths >4 m to numerous bryozoans (especially fenestrates), serpulid worms, numerous and diverse demosponges, ascidians, small solitary corals, epifaunal echinoids, and gastropods, and 2) a veil of macroalgae (mainly Cystophora and Ecklonia) that drapes down and shades the rock walls. Most carbonate sediment production does not come from calcareous epiphytes on the macroalgae but comes from the coralline algae and calcareous invertebrates living on the rock walls and in concealed depressions. Mollusks (gastropods and bivalves) and geniculate coralline algae with numerous lithodasts, crustose coralline fragments, barnacle plates, serpulid worms, bryozoans, and large benthic foraminifers (especially Amphistegina) dominate the resultant gravels and sands; but there is little or no mud. This is because carbonate sediment is the result of production not only in the macrophyte factory but also in adjacent seagrass factories. Particles produced in the macroalgal factory are shed onto the adjacent seafloor, where they form the requisite sandy substrates for quick colonization by seagrasses. Thus, over time the sediment in this shallow but hydrodynaically energetic environment becomes a mixture of materials from the two sources with seagrasses contributing gastropods, large benthic foraminifers, spirorbids, bryozoans and articulated corallines to the sediment milieu. If this system is a typical example, then warm-temperate Neogene carbonate facies related to macroalgal factories should be a mixture of materials from the rocky substrates, a calcareous infauna, and marine seagrasses.
机译：南澳大利亚南部约克半岛南部浅水（<20 m）温带海洋环境中的多产大型藻类森林有两个产碳酸盐生境，1）大型自生植物下方朝上的裸露岩石表面，以及2）隐藏的岩石悬垂物下方的表面，岩壁上，裂缝和压痕都位于棕色大型藻类幕布的后面。裸露的表面具有三个生长层。 1）被草食性腹足动物放牧的基部，厘米高的单板或表皮的硬皮珊瑚线，膝状珊瑚线和短肉红藻，2）中间，高5-20厘米的肉红藻群落，以及3）一个20-100 cm +高的大型自生植物（特别是Ecklonia，Cystophora和Xiophora）的树冠，其叶片局部包裹着苔藓虫，如Membranipora membranacea和spirorbids。垂直藻壁的隐蔽表面和巨藻幕后的隐蔽生境分为两层。 1）聚拢的动植物，尤其是浅水区的硬壳和膝状珊瑚线的聚宝盆，在大于4 m的水深处让位给众多的苔藓虫（尤其是孔雀草），虫卵虫，众多多样的demo虫，海生动物，小的单生珊瑚，表皮的类chin虫和腹足类动物，以及2）大型藻类（主要是Cystophora和Ecklonia）的面纱，垂下并遮盖了岩壁。大多数碳酸盐沉积物的产生不是来自大型藻类的钙质附生植物，而是来自生活在岩壁和隐蔽洼地的珊瑚藻类和钙质无脊椎动物。软体动物（腹足动物和双壳类动物）和膝状藻类藻类，有许多蜥脚类动物，甲壳珊瑚质碎片，藤壶板，蛇纹石蠕虫，苔藓虫和大型底栖有孔虫（尤其是两栖类有孔虫）占主导地位；但几乎没有泥。这是因为碳酸盐沉积物不仅是大型植物工厂而且是邻近海草工厂的生产结果。在大型藻类工厂中产生的颗粒会掉落到相邻的海底，在那里它们形成了必要的含沙基质，可被海草快速定居。因此，随着时间的流逝，在这个浅而有水力的高能环境中的沉积物变成了两种来源的物质的混合物，其中海草为腹足纲动物，大型底栖有孔虫，螺旋体，苔藓动物和铰接的珊瑚线提供了沉积物环境。如果该系统是一个典型的例子，那么与大型藻类工厂有关的温带新近纪碳酸盐岩相应该是岩石底物，钙质动物群和海藻的混合物。

著录项

  • 来源
    《Sedimentary geology》 |2011年第2期|p.41-53|共13页
  • 作者

    Noel P. James; Yvonne Bone;

  • 作者单位

    Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario, Canada K7L 3N6;

    School of Earth and Environmental Sciences, Geology, University of Adelaide, Adelaide, South Australia 5005, Australia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    carbonate sediments; macroalgae; warm-temperate marine;

    机译：碳酸盐沉积物;宏藻类;温带海洋;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号