文献类型：期刊文献

英文题名：The geochemistry and formation of ferromanganese oxides on the eastern flank of the Gagua Ridge

作者：Chen, Shuai[1];Yin, Xuebo[1];Wang, Xiaoyuan[1,2];Huang, Xin[3];Ma, Yao[1];Guo, Kun[1];Zeng, Zhigang[1,2]

机构：[1]Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China;[2]Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Peoples R China;[3]Guangdong Ocean Univ, Guangdong Prov Key Lab Coastal Ocean Variat & Dis, Zhanjiang 524088, Peoples R China

年份：2018

卷号：95

起止页码：118

外文期刊名：ORE GEOLOGY REVIEWS

收录：SCI-EXPANDED(收录号：WOS:000432760500008)、、EI(收录号：20180904846413)、Scopus(收录号：2-s2.0-85042493237)、WOS

基金：The authors thank all the scientific and technical staff who participated in the HOBAB4 cruise onboard R/V KEXUE for the data acquisition and sample collecting, which were essential for the writing of this paper. This investigation is supported by the National Natural Science Foundation of China (41306053, 41476044, 41325021, 41706052), National Key Basic Research Program of China (2013CB429700), Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences (Grant No. MGE2015KG01, MGE2011KG09), Special Fund for the Taishan Scholar Program of Shandong Province (Grant No. ts201511061), and the AoShan Talents Program Supported by Qingdao National Laboratory for Marine Science and Technology (Grant No. 2015ASTP-0S17). We thank Gonzalez F.J., Hein, J.R. and Editors for their constructive comments that greatly improved this manuscript.

语种：英文

外文关键词：Gagua Ridge; Ferromanganese oxides; Geochemical composition; Hydrogenetic growth

外文摘要：Ferromanganese oxides on the eastern flank of the Gagua Ridge were collected from a water depth of 4071 m by TV-grab in 2016 and analyzed for their mineralogical and chemical compositions. These oxide fragments were broken from a large poly-core crust and can be divided into three parts: a dense inner nodule, a radial middle crust and a loose outer crust. The close proximity of the nodule and crust is similar to that observed in the amalgamated deposits from the Shatsky Rise, NW Pacific. All samples are mainly composed of Fe-rich vernadite, amorphous FeOOH and associated quartz, plagioclase, pyroxene and Mg-titanomagnetite. The mineralogy, Mn/ Fe ratios, rare earth element patterns, and slow growth rates (with a mean value of 6.2 mm/Myr) of the samples reflect their predominantly hydrogenetic origin. Co, Ni, Cu, REY and other critical metals are most enriched in the Mn-rich inner nodule samples, which also have the highest Fe contents. In contrast, the Si and Al contents in the samples of the middle and outer crusts are very high, up to 19 wt% and 6.29 wt%, respectively. Correlation analysis indicates that Li, Sc, Cr, Rb, and Cs tend to concentrate in detrital silica-aluminosilicate phases. The Gagua Ridge samples generally have lower metal contents than the hydrogenetic crusts and nodules from other open ocean regions, which can be attributed to their dilution by detritus and the poor development of a mid-water oxygen minimum zone. However, the incorporation of detritus has little effect on the generation of Fe-Mn oxides in the Gagua Ridge. Based on their mineralogy, textures and chemical variations, the accretion of the hydrogenetic Fe-Mn oxides was initiated in the late Miocene, and the formation of the amalgamated Fe-Mn deposits comprised three stages.