Unmanned aerial vehicle oblique photography‐based superposed fold analysis of outcrops in the Xuhuai region, North China,Geological Journal

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Unmanned aerial vehicle oblique photography‐based superposed fold analysis of outcrops in the Xuhuai region, North China
Geological Journal ( IF 1.4 ) Pub Date : 2020-12-10 , DOI: 10.1002/gj.4048
Hongyu Lai ₁ , Liping Liu ₁ , Xiao Liu ₁ , Yongming Zhang ₁ , Xiaohu Xuan ₁

Affiliation

Unmanned aerial vehicle (UAV) oblique photography technology is widely utilized in various fields owing to such advantages as true three‐dimensional (3D), high precision, and low expenses. We explored the application of UAV oblique photography in the superposed fold analysis conducted in the Xuhuai region. Three feasible and time‐efficient steps were established to fulfil the task. The tile images from UAV oblique photography are first synthesized on the Altizure website into a 3D outcrop model, which is then imported into ArcScene to extract bedding and lineation attitudes by GeoAnalysis Tools. The fold geometry and superposed style were characterized and analysed based on the 3D model, followed by extending the 3D structure morphology across the entire outcrop scale and illustrating the superposition style and sequence in the GOCAD platform. The geological conclusions were drawn by applying the method for analysing two outcrops in the Xuhuai region. Two phases of folds were identified, with the first generation nearly E‐W‐trending oblique‐recumbent folds overprinted by the second‐generation NNE‐NE‐trending wide and upright folds. The nearly E‐W‐striking fold is inferred to be related to the compressive orogeny in the Dabie Orogenic Belt in the Triassic. The NNE‐NE‐striking fold is related to the northwest subduction of the Pacific Plate or the northward thrust of the Sulu Orogenic Belt in the Jurassic. This example demonstrates that UAV oblique photography is a powerful and reliable method for structural analysis at the outcrop scale, especially for the inaccessible outcrops with weak vegetation cover.

中文翻译：

华北徐淮地区基于无人机斜摄影的露头叠加褶皱分析

由于真正的三维（3D），高精度和低成本等优点，无人飞行器（UAV）斜摄影技术已广泛应用于各个领域。我们探索了无人机斜摄影在徐淮地区进行叠合褶皱分析中的应用。建立了三个可行且省时的步骤来完成任务。首先，在Altizure网站上将来自无人机倾斜摄影的瓷砖图像合成为3D露头模型，然后将其导入ArcScene，以通过GeoAnalysis Tools提取出层理和线型姿态。根据3D模型对折叠的几何形状和叠置样式进行了表征和分析，然后将3D结构形态扩展到整个露头范围，并在GOCAD平台中说明了叠置样式和序列。运用徐淮地区两次露头的分析方法得出了地质结论。褶皱分为两个阶段，第二代NNE-NE趋势宽折叠和直立褶皱覆盖了第一代近乎E趋势的倾斜斜躺褶皱。据推测，近三叠世的褶皱与三叠纪的大别造山带的压缩造山运动有关。NNE-NE-走向褶皱与太平洋板块的西北俯冲或侏罗纪苏鲁造山带的北向逆冲有关。这个例子表明，无人机倾斜摄影是一种用于露头规模结构分析的强大而可靠的方法，特别是对于植被覆盖薄弱而无法进入的露头。

更新日期：2020-12-10

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