期刊
NEW ZEALAND JOURNAL OF MARINE AND FRESHWATER RESEARCH
卷 42, 期 4, 页码 389-395出版社
RSNZ PUBLISHING
DOI: 10.1080/00288330809509967
关键词
carbonate mineralogy; bryozoans; aragonite; calcite
Three colonies of the erect, robust branching, cheilostome bryozoan Adeonellopsis sp. were collected from Doubtful Sound, New Zealand. to investigate within-colony variation in carbonate mineralogy. One-hundred-and-twenty-one sections from 9 branches were found to contain mostly aragonite, with calcite ranging from 1.1 to 73 wt% (mean +/- SD = 2.4 +/- 1.2 wt%, n = 120). The magnesium (Mg) content in calcite ranged from 5.3 to 13.1 wt% magnesium carbonate (8.8 +/- 1.0 wt% MgCO(3); n = 120). Calcite content decreased with increasing age proximally along the branch. indicating that secondary thickening is achieved,, with aragonite. In contrast. an oscillating trend in Mg content along branches suggests that seasonal or interannual environmental parameters may influence this geochemical parameter. Mineralogical variability highlights the need for multiple samples from the same colon), to be measured when determining quantitative carbonate mineralogy in bryozoans. Bimineralic bryozoans such as Adeonellopsis sp. may have lower preservation potential than monomineralic bryozoans, and consequently may not survive diagenesis to become fossils. Bimineralic species may also be more vulnerable to dissolution pressure and possible ocean acidification than monomineralic calcitic taxa.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据