X-ray imagery and physical core logging as a proxy of the content of sediment cores in cold-water coral mound provinces: a case study from Porcupine Seabight, SW of Ireland
X-ray imagery and physical core logging as a proxy of the content of sediment cores in cold-water coral mound provinces: a case study from Porcupine Seabight, SW of Ireland
复制标题
X 射线图像和物理岩心测井作为冷水珊瑚丘省沉积物岩心含量的代理：爱尔兰西南部豪猪海湾的案例研究
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
J. Henriet
中科院分区：
文献类型：
--
作者：
A. Foubert;D. Rooij;D. Blamart;J. Henriet
据报道，爱尔兰西南部豪猪西湾的三个省份存在被解释为冷水珊瑚岸的碳酸盐丘，最近进行了许多详细研究。本文讨论了 X 射线图像和物理特性在破译古海洋学、沉积学和生物过程中的应用。物理性质岩心测井和 X 射线图像用于识别和描述两个土丘省（分别是贝尔吉卡土丘省和麦哲伦土丘省）的沉积状况及其各自的古海洋和古气候环境。目前，两省的水动力环境存在明显差异。这项研究证实，过去两个省份的海洋和沉积环境也存在明显差异。与北大西洋海因里希事件（HE）相比，冰期-间冰期变化和当地衍生的冰漂流事件（IRE）的影响已在这两个省得到认可。此外，X射线图像、磁化率、伽马密度和P波速度的结合使得能够估计位于碳酸盐丘顶部的未开放核心中的珊瑚含量和珊瑚分布。对两个省的土丘上和土外核心进行比较可以揭示土丘演化和珊瑚生长随时间变化的一些机制。
Three provinces, characterized by the presence of carbonate mounds interpreted as cold-water coral banks have been reported in Porcupine Seabight, SW of Ireland and were recently subjected to many detailed studies. This contribution discusses the use of X-ray imagery and physical properties in deciphering palaeoceanographic, sedimentological and biological processes. Physical property core logging and X-ray imagery are used to identify and describe sedimentation regimes and so their respective palaeoceanographic and palaeoclimatological settings in two mound provinces, respectively the Belgica mound province and the Magellan mound province. Both provinces show at present time clear differences in the hydrodynamic environment. This study confirms that also during the past the oceanographic and sedimentological environment of both provinces differ clearly. Impacts of glacial–interglacial variations and locally derived ice rafting events (IRE), comparable with the North Atlantic Heinrich events (HE) have been recognized in both provinces. Moreover, the combination of X-ray imagery, magnetic susceptibility, gamma density and P-wave velocity makes it possible to estimate the coral content and coral distribution in unopened cores localized on top of carbonate mounds. A comparison between on-mound and off-mound cores in both provinces allowed revealing some mechanisms of mound evolution and coral growth versus time.