| Mineralogical characteristics of polymetallic sulfides from the Deyin-1 hydrothermal field near 15°S,southern Mid-Atlantic Ridge |
| |
| 引用本文： | 王淑杰,李怀明,翟世奎,于增慧,邵宗泽,蔡宗伟.Mineralogical characteristics of polymetallic sulfides from the Deyin-1 hydrothermal field near 15°S,southern Mid-Atlantic Ridge[J].海洋学报(英文版),2017,36(2):22-34. |
| |
| 作者姓名： | 王淑杰 李怀明 翟世奎 于增慧 邵宗泽 蔡宗伟 |
| |
| 作者单位： | 中国海洋大学海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 中国 山东 青岛 266100,国家海洋局第二海洋研究所, 国家海洋局海底科学重点实验室, 中国 浙江 杭州 310012,中国海洋大学海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 中国 山东 青岛 266100,中国海洋大学海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 中国 山东 青岛 266100,国家海洋局第三海洋研究所, 国家海洋局海洋生物遗传资源重点实验室, 中国 福建 厦门 361005,中国海洋大学海底科学与探测技术教育部重点实验室, 海洋地球科学学院, 中国 山东 青岛 266100 |
| |
| 基金项目： | The National Basic Research Program (973 Program) of China under contract No. 2013CB429702; the National Oceanic Major Project of 12th Five Year under contract No. DY125-11-R-05. |
| |
| 摘 要： | A seafloor hydrothermal field, named Deyin-1 later, near 15°S southern Mid-Atlantic Ridge(SMAR) was newly found during the 22 nd cruise carried out by the China Ocean Mineral Resources Research Development Association(COMRA). Sulfide samples were collected at three stations from the hydrothermal field during the26 th cruise in 2012. In this paper, mineralogical characteristics of the sulfides were analyzed with optical microscope, X-ray diffractometer, scanning electron microscope and electron microprobe to study the crystallization sequence of minerals and the process of hydrothermal mineralization. According to the difference of the ore-forming metal elements, the sulfide samples can be divided into three types:(1) the Ferich sulfide, which contains mainly pyrite and chalcopyrite;(2) the Fe-Cu-rich sulfide consisting predominantly of pyrite, chalcopyrite and isocubanite, with lesser amount of sphalerite, marmatite and pyrrhotine; and(3) the Fe-Zn-rich sulfide dominated by pyrite, sphalerite and marmatite, with variable amounts of chalcopyrite, isocubanite, pyrrhotine, marcasite, galena and gratonite. Mineral precipitations in these sulfides are in the sequence of chalcopyrite(isocubanite and possible coarse pyrite), fine pyrite,sphalerite(marmatite), galena, gratonite and then the minerals out of the dissolution. Two morphologically distinct generations(Py-I and Py-II) of pyrite are identified in each of the samples; inclusions of marmatite tend to exist in the coarse pyrite crystals(Py-I). Sphalerite in the Fe-Zn-rich sulfide is characterized by a"chalcopyrite disease" phenomenon. Mineral paragenetic relationships and a wide range of chemical compositions suggest that the environment of hydrothermal mineralization was largely changing. By comparison, the Fe-rich sulfide was formed in a relatively stable environment with a high temperature, but the conditions for the formation of the Fe-Cu-rich sulfide were variable. The Fe-Zn-rich sulfide was precipitated during the hydrothermal venting at relatively low temperature.
|
| 关 键 词： | 矿物学特征 矿物结晶顺序 多金属硫化物 德音1号热液区 南大西洋中脊 |
| 收稿时间： | 2016/4/20 0:00:00 |
| 修稿时间： | 2016/6/15 0:00:00 |
Mineralogical characteristics of polymetallic sulfides from the Deyin-1 hydrothermal field near 15°S, southern Mid-Atlantic Ridge |
| |
| WANG Shujie,LI Huaiming,ZHAI Shikui,YU Zenghui,SHAO Zongze and CAI Zongwei.Mineralogical characteristics of polymetallic sulfides from the Deyin-1 hydrothermal field near 15°S, southern Mid-Atlantic Ridge[J].Acta Oceanologica Sinica,2017,36(2):22-34. |
| |
| Authors: | WANG Shujie LI Huaiming ZHAI Shikui YU Zenghui SHAO Zongze and CAI Zongwei |
| |
| Institution: | 1.Key Laboratory of Submarine Geosciences and Prospecting Techniques of Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China2.Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China3.Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China |
| |
| Abstract: | A seafloor hydrothermal field, named Deyin-1 later, near 15°S southern Mid-Atlantic Ridge (SMAR) was newly found during the 22nd cruise carried out by the China Ocean Mineral Resources Research & Development Association (COMRA). Sulfide samples were collected at three stations from the hydrothermal field during the 26th cruise in 2012. In this paper, mineralogical characteristics of the sulfides were analyzed with optical microscope, X-ray diffractometer, scanning electron microscope and electron microprobe to study the crystallization sequence of minerals and the process of hydrothermal mineralization. According to the difference of the ore-forming metal elements, the sulfide samples can be divided into three types:(1) the Fe-rich sulfide, which contains mainly pyrite and chalcopyrite; (2) the Fe-Cu-rich sulfide consisting predominantly of pyrite, chalcopyrite and isocubanite, with lesser amount of sphalerite, marmatite and pyrrhotine; and (3) the Fe-Zn-rich sulfide dominated by pyrite, sphalerite and marmatite, with variable amounts of chalcopyrite, isocubanite, pyrrhotine, marcasite, galena and gratonite. Mineral precipitations in these sulfides are in the sequence of chalcopyrite (isocubanite and possible coarse pyrite), fine pyrite, sphalerite (marmatite), galena, gratonite and then the minerals out of the dissolution. Two morphologically distinct generations (Py-I and Py-II) of pyrite are identified in each of the samples; inclusions of marmatite tend to exist in the coarse pyrite crystals (Py-I). Sphalerite in the Fe-Zn-rich sulfide is characterized by a "chalcopyrite disease" phenomenon. Mineral paragenetic relationships and a wide range of chemical compositions suggest that the environment of hydrothermal mineralization was largely changing. By comparison, the Fe-rich sulfide was formed in a relatively stable environment with a high temperature, but the conditions for the formation of the Fe-Cu-rich sulfide were variable. The Fe-Zn-rich sulfide was precipitated during the hydrothermal venting at relatively low temperature. |
| |
| Keywords: | mineralogical characteristics mineral-forming sequence polymetallic sulfides Deyin-1 hydrothermal field southern Mid-Atlantic Ridge |
| 本文献已被 CNKI SpringerLink 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
|
