| 利用三维CT扫描技术定量计算熔岩流气泡体积的研究与实现 |
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| 引用本文： | 张茂亮,刘真,陈德峰,郭正府,郭文峰.利用三维CT扫描技术定量计算熔岩流气泡体积的研究与实现[J].岩石学报,2014,30(12):3709-3716. |
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| 作者姓名： | 张茂亮 刘真 陈德峰 郭正府 郭文峰 |
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| 作者单位： | 中国科学院地质与地球物理研究所新生代地质与环境重点实验室, 北京 100029;中国人民大学信息学院, 北京 100872;首都师范大学检测成像实验室, 北京 100048;中国科学院地质与地球物理研究所新生代地质与环境重点实验室, 北京 100029;中国科学院地质与地球物理研究所新生代地质与环境重点实验室, 北京 100029 |
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| 基金项目： | 本文受中国科学院战略性先导科技专项(B类)(XDB03010600)、国家自然科学基金重大国际合作项目(41020124002)和国家自然科学重点项目(41130314)联合资助. |
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| 摘 要： | 气泡体积算法及其计算机实现是火山熔岩流气泡古高度计应用研究中的难点之一,直接制约着古高度计算结果的精确度。本文提出了一种新的基于计算机断层成像技术的熔岩流气泡众数统计方法,即通过计算机断层成像技术对气孔状玄武岩样品进行三维重构,利用不同物质对射线吸收衰减系数的不一致性,标记重构数据中的岩石、气泡与无效部分,进而提取气泡连通区域的骨架,确定独立气泡之间的分割面,最终统计出气泡的数量与体积。考虑到玄武岩中气泡截面轮廓不规则的特点,采用逐点法有效地计算了截面面积,排除了连通区域轮廓对面积计算结果的影响。采用基于区域划分的阈值计算方法统计玄武岩样品的气泡数量与体积,解决了传统的单一阈值计算方法导致的小连通区域过度分割的问题。在上述新方法的基础上,本文设计并构建了新的气泡数量与体积的统计软件,计算程序的初步运算结果证实了研究方法的有效性与可行性。该方法有望提高熔岩流气泡数量、体积以及火山熔岩流气泡古高度计的计算精度,成为重建高原隆升历史的快速分析工具。
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| 关 键 词： | 气孔状玄武岩 计算机断层成像 逐点法 阈值算法 古高度 |
| 收稿时间： | 2/8/2014 12:00:00 AM |
| 修稿时间： | 2014/7/10 0:00:00 |
Research and implementation on vesicle volume calculation of lava flows using three-dimensional computerized tomography (CT) scanning technology |
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| ZHANG MaoLiang,LIU Zhen,CHEN DeFeng,GUO ZhengFu and GUO WenFeng.Research and implementation on vesicle volume calculation of lava flows using three-dimensional computerized tomography (CT) scanning technology[J].Acta Petrologica Sinica,2014,30(12):3709-3716. |
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| Authors: | ZHANG MaoLiang LIU Zhen CHEN DeFeng GUO ZhengFu and GUO WenFeng |
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| Institution: | Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Information School, Renmin University of China, Beijing 100872, China;Computerized Tomography Lab, Capital Normal University, Beijing 100048, China;Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Vesicle volume calculation and its computer implementation is one of the difficulties in application of vesicular basalt paleoaltimeter, which directly constrains the accuracy of resultant paleoelevation. In this study, we present a new statistical method of vesicle size distributions in lava flows based on three-dimensional computerized tomography (CT) scanning technology. First, three-dimensional data of vesicular basalt samples are reconstructed using cone beam CT experimental equipment. Second, based on variable mass-X-ray absorption attenuation coefficients, different parts for rock, vesicles and invalid background are established to identify connected skeletons and interfaces among vesicles. Finally, vesicle population and volume are calculated by new methods proposed in this study. Given that vesicles in basaltic lava flows are characterized by irregular profiles, we use traversal-points algorithm to effectively calculate areas of vesicle cross sections, eliminating influences from irregular profiles of connected vesicles. New threshold algorithm based on field separation is proposed for calculating vesicle population and volume, resolving problems of excessive separation on small vesicles when using traditional single threshold method. Thus, we design a new statistical procedure to calculate vesicle population and volume, and preliminary results of the algorithm confirmed its effectiveness and feasibility. Our statistical method is expected to improve the calculation accuracy of vesicle population and size distribution in basaltic lava flows and be one of the effective proxies for reconstructing uplift history of continental plateau such as Tibetan Plateau. |
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| Keywords: | Vesicular basalts Computerized tomography Traversal-points algorithm Threshold algorithm Paleoelevation |
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