Tomographic Analysis for Bioerosion Signatures in Shallow-Water Rhodoliths from the Abrolhos Bank, Brazil
Tomographic Analysis for Bioerosion Signatures in Shallow-Water Rhodoliths from the Abrolhos Bank, Brazil
复制标题
巴西阿布洛霍斯浅滩浅水红石生物侵蚀特征的层析成像分析
DOI：
10.2112/11t-00006.1
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
G. Amado
中科院分区：
文献类型：
--
作者：
R. N. Leal;D. Bassi;R. Posenato;G. Amado
摘要 LEAL，R.N.；巴西，D.； POSENATO, R. 和 AMADO-FILHO, G.M.，2012 年。巴西阿布罗霍斯浅滩浅水红石生物侵蚀特征的断层扫描分析。现在，所有尺度的生物侵蚀被认为在相解释中发挥着重要作用。如果宏观和微观钻孔可以归因于特定钻孔者的活动，则可以提供水深的指示。断层扫描分析是一种评估生物侵蚀、识别钻孔类群以及计算当今红石体积和孔隙率的新方法。断层扫描系统还可以对生物侵蚀产生的碳酸钙进行定量。最近在巴西阿布洛霍斯浅滩 20 米水深处采集的红石榴石已进行多重扫描分析。研究表明，该地点的红石榴石的特点是高度多样化的钻孔双壳类和海绵组合，这些组合产生了 ichnogenera Gastrochaenolites 和 Entobia。这个无聊组合中的动物群可以去除多达 10% 的红宝石体积。该方法预计会产生与应用于其他地点和时间范围的现代红宝石和化石红宝石相似的结果。
Abstract LEAL, R.N.; BASSI, D.; POSENATO, R., and AMADO-FILHO, G.M., 2012. Tomographic analysis for bioerosion signatures in shallow-water rhodoliths from the Abrolhos Bank, Brazil. Bioerosion at all scales is now recognized as playing a major role in facies interpretation. Macroscopic and microscopic borings can provide an indication of water depth, if they can be attributed to the action of specific borers. Tomographic analysis is a new method for assessing bioerosion, for identifying boring taxa, as well as for calculating the volume and porosity in present-day rhodoliths. The tomographic system provides also a quantification of the calcium carbonate produced by bioerosion. Recent rhodoliths collected at 20-m water depth on the Abrolhos Bank, Brazil, have been multiscann analyzed. The study shows that rhodoliths from this site are characterized by a highly diversified assemblage of boring bivalves and sponges associated producing the ichnogenera Gastrochaenolites and Entobia. The fauna from this boring assemblage can remove up to 10% of the rhodolith volume. The method can be expected to yield similar results as applied to both modern and fossil rhodoliths from other localities and time frames.