1. Institute of Gravity and Magnetic Technology,Chang’an University,Xi’an 710054,China 2. College of Geology Engineering and Geomatics,Chang’an University,Xi’an 710054,China 3. Key Laboratory of Western China’s Mineral Resources and Geological Engineering,Ministry of Education,Chang’an University,Xi’an 710054,China 4. Department of Earth Sciences,Memorial University of Newfoundland,St.Johns’,A1B3X5,Canada 5. Key Laboratory of Marine Mineral Resources,Guangzhou 510075,China 6. Ministry of Natural and Resources,Guangzhou Marine Geological Survey,Guangzhou 510075,China
The Jiaxie Guyots, located in the western Pacific and belongs to China's contract areas of cobalt-rich ferromanganese crusts, contains strategic metal mineral resources, especially cobalt. Local structures of the guyots play an important controlling role in the macroscopic distribution of these resources, which leads to the research on the tectonic division of the guyots to understand their formation processes and explore mineral resources. In this paper, the gravity and magnetic data as well as topographic data were used to delineate fracture features of Jiaxie Guyots by using the normalized vertical derivative of the total horizontal derivative (NVDR-THDR) edge recognition method and curvature attribute depth inversion method. The minimum curvature potential field separation method was used to delineate the distribution features of flank rift zones and gravity slide areas. The results show that faults of Jiaxie Guyots are mainly NW- and NE-trending, followed by NNW- and NEE-trending. The range of apparent depths of faults is between 3000 and 7000 m, and usually the depth of NW-trending faults are shallower than that of NE-trending faults. The faults of these two different directions intersect to form a conjugate shear fault zone, showing a geese-like arrangement, which provides magma volcanic conduits for seamount formation and rock wall intrusion. The flank rift zones are generally located in irregular terrain extensions of guyots, because they were shaped with magma intrusion and reshaped the seamount as irregularly appearances. During the development of flank rift zones, the gravity slide areas were also formed due to the influence of tectonic activities like earthquakes, and commonly they were located on sharp sides of margins and two sides of flank rift zones. The authors hold that this study of geological structures could give strong support to the study of the formation of Jiaxie Guyots and the comprehensive evaluation of cobalt-rich crust ferromanganese.
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