Distribution Characteristics of Cobalt-rich Ferromanganese Crust Resources on Submarine Seamounts in the Western Pacific |
| |
Authors: | ZHANG Fuyuan ZHANG Weiyan ZHU Kechao GAO Shuitu ZHANG Haisheng ZHANG Xiaoyu ZHU Benduo |
| |
Institution: | [1]Key Laboratory of Submarine Geosciences, State Oceanic Administration; Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China [2]Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou 510760, China [3]Zhejiang University, Hangzhou 310012, China |
| |
Abstract: | Based on the survey data of five submarine seamount provinces (chains) in the Western Pacific, the distribution characteristics of cobalt‐rich ferromanganese crust resources have been researched in this paper by using the relative reference data and applying the theories of hotspot and seafloor spreading. The main research results obtained are as follows: The Co‐rich crust thickness in the study area is gradually increasing from east to west and from south to north having a negative correlation (r = ?0.59) with longitude and a positive correlation (r = 0.48) with latitude. The crust thickness varying along longitude and latitude is influenced by the hotspot and seafloor spreading. The oceanic crusts and seamounts in the northwest part of the study area are older, and the crust resources are superior to those in the southeast part. In the depth of <1500 m, 1500–2000 m, 2000–2500 m in the study area, the cobalt crust thickness is respectively 5.45 cm, 4.34 cm and 3.55 cm, and in the depth of 2500–3000 m and 3000–3500 m, it drops respectively to 2.84 cm and 3.37 cm. The Co‐rich crust resources are mainly concentrated in the seamount summit margins and the upper flanks in the depth of <2500 m. There is a strong negative correlation (r = ?0.67) between the cobalt crust abundance and the slope of the seamount, 75 kg/m2 and 50 kg/m2 at the slopes of 0°–20° and 20°–34° respectively. Cobalt crusts are mainly distributed in the parts whose slopes are less than 20°. It is consistent with the fractal result that the slope threshold of cobalt crust distribution is 19°, and slopes over 20° are not conducive to the crust growth. The cobalt crusts of high grade are mainly enriched in the region within 150°E‐140°W and 30°S‐30°N in the Pacific, where there are about 587 seamounts at the depth of 3500–6000 m and over 30 Ma of the oceanic crusts. The perspective area rich in cobalt crust resources is about 41times104 km2 and the resource quantity is approximately 27 billion tons. |
| |
Keywords: | Western Pacific seamounts Co-rich crusts resources distribution characteristics |
本文献已被 CNKI 维普 万方数据 等数据库收录! |
| 点击此处可从《Acta Geologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Geologica Sinica》下载免费的PDF全文 |
|