X-ray CT scanning technique and its application to the Core 01 in the northern South China Sea for sedimentary environment reconstruction
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摘要: 随着技术的不断进步，X射线CT扫描与三维重建技术在地质学研究中的应用越来越广泛，但在深海岩心的分析中应用依然有限。对南海北部陆坡岩心柱Core 01进行全样岩心X射线CT扫描，将扫描图像导入三维建模软件Mimics，进行岩心内部结构的三维重建，恢复了该岩心中0～1.0 m的孔隙结构及4.2 m处的生物化石壳体的外部形态。重建结果表明X射线CT扫描在深海岩心的研究中具有可行性。此外，结合浮游有孔虫AMS 14C测年、底栖有孔虫氧碳同位素结果以及此站位的地质背景，推断该岩心中孔隙的形成可能与该区天然气水合物的释放有关。Abstract: X-ray CT scanning and three-dimension reconstruction techniques are widely used in geological research nowadays. However, their application to deep sea sediment cores remains rare. In this study, a deep-sea core labeled Core 01 taken from the northern South China Sea was subjected to a full core X-ray CT scan. The images were imputed into Mimics, a three-dimensional modeling software, to carry out 3D reconstruction of the internal structures of the core, which includes the pore structures at 0～1.0 m and the external shape of fossils at 4.2 m. The results confirmed that X-ray CT scan is feasible for study of deep sea sediment cores. In addition, in combination with the AMS 14C dating data of planktonic foraminifera, the oxygen carbon stable isotope results of benthic foraminifera, and the geological background of this region, it is inferred that the formation of pores in the sediment core may be related to the release of natural gas hydrates.
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Keywords:
- X-ray /
- CT scan /
- three-dimension reconstruction /
- sediment core
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图 1 Core 01采样位置及本文中涉及的站位E413
Figure 1. Location of Core 01 and station E413 involved in this research
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图 2 Core 01岩心的剖面图及灰度示意图
a. 剖面图，b. CT灰度示意图。
Figure 2. Profile and CT gray scale images of Core 01
a. profile, b. CT gray scale images.
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图 3 Core 01岩心0.38～0.58 m段剖面图及孔隙的三维重建模型
a. 剖面图，b-c. 不同方位视角下的孔隙三维重建模型。
Figure 3. Profile and 3D model of pores in section 0.38～0.58 m, Core 01
a. profile, b-c. 3D model of pores from different perspectives.
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图 4 不同方位视角下Core 01岩心4.2 m处碳酸盐化石三维重建模型
Figure 4. 3D model of the carbonate fossil from different perspectives at 4.2 m, Core 01
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