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Automated multi-scale classification of the terrain units of the Jiaxie Guyots and their mineral resource characteristics

引用

Acta Oceanologica Sinica 2022年第7期41卷 128-138页

作者： Yong Yang Gaowen He Yonggang Liu Jinfeng Ma Zhenquan Wei Binbin Guo Institute of Geology Chinese Academy of Geological SciencesBeijing100037China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China Guangzhou Marine Geological Survey Key Laboratory of Marine Mineral Resources of Ministry of Natural ResourcesGuangzhou510075China

Given the advances in satellite altimetry and multibeam bathymetry,benthic terrain classification based on digital bathymetric models(DBMs)has been widely used for the mapping of benthic *** instance,cobaltrich crusts(CRCs)are important mineral resources found on seamounts and guyots in the western pacific ***,plate-like CRCs are known to form on the summit and slopes of seamounts at the 1000–3000 m depth,while the relationship between seamount topography and spatial distribution of CRCs remains *** benthic terrain classification of seamounts can solve this problem,thereby,facilitating the rapid exploration of seamount *** study used an EM122 multibeam echosounder to retrieve high-resolution bathymetry data in the CRCs contract license area of China,i.e.,the Jiaxie Guyots in 2015 and *** on the DBM construted by bathymetirc data,broad-and fine-scale bathymetric position indices were utilized for quantitative classification of the terrain units of the Jiaxie Guyots on multiple *** classification revealed four first-order terrain units(e.g.,flat,crest,slope,and depression)and eleven second-order terrain units(e.g.,local crests,depressions on crests,gentle slopes,crests on slopes,and local depressions,etc.).Furthermore,the classification of the terrain and geological analysis indicated that the Weijia Guyot has a large flat summit,with local crests at the southern summit,whereas most of the guyot flanks were covered by gentle slopes.“Radial”mountain ridges have developed on the eastern side,while large-scale gravitational landslides have developed on the western and southern ***,landslide masses can be observed at the bottom of these *** coverage of local crests on the seamount is∼1000 km^(2),and the local crests on the peak and flanks of the guyots may be the areas where thick and continuous plate-like CRCs are likely to occur.

关键词： bathymetric position index multi-scale terrain classification local crest western pacific seamount cobalt-rich crusts

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