| Hydrothermal alteration of plagioclase microphenocrysts and glass in basalts from the East Pacific Rise near 13 degrees N: An SEM-EDS study | |
| Zeng ZhiGang; Qi HaiYan; Chen Shuai; Yin XueBo; Li ZhaoXue; Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China. | |
| 2014-07-01 | |
| 发表期刊 | SCIENCE CHINA-EARTH SCIENCES
 |
| 卷号 | 57期号:7页码:1427-1437 |
| 文章类型 | Article |
| 摘要 | The interactions of seafloor hydrothermal fluid with igneous rocks can result in leaching elements from the rocks, creating potential ore-forming fluids and influencing the chemical compositions of near-bottom seawater. The hydrothermal alteration of plagioclase microphenocrysts and basaltic glass in the pillow basalts from one dredge station (103 degrees 57.62'W, 12 degrees 50.55'N, water depth 2480 m) on the East Pacific Rise (EPR) near 13 degrees N were analyzed using a scanning electron microscope (SEM) and energy dispersive X-ray spectrometry (EDS). The results show that the edges of the plagioclase microphenocrysts and the basaltic glass fragments are altered but the pyroxene and olivine microphenocrysts in the interior of the pillow basalts appear to be unaffected by the hydrothermal fluids. In addition, our results show that the chemical alteration at the rims of the plagioclase microphenocrysts and the edges of basaltic glass fragments can be divided into separate types of alteration. The chemical difference in hydrothermal alteration of the plagioclase microphenocrysts and the basaltic glass indicate that different degrees of hydrothermal fluid-solid phase interaction have taken place at the surface of the pillow basalts. If the degree of hydrothermal fluid-solid phase interaction is relatively minor, Si, Al, Ca and Na diffuse from the inside of the solid phase out and as a result these elements have a tendency to accumulate in the edge of the plagioclase microphenocrysts or basaltic glass. If the degree of hydrothermal fluid-solid phase interaction is relatively strong, Si, Al, Ca and Na also diffuse from the inside of solid phase out but these elements will have a relatively low concentration in the edge of the plagioclase microphenocrysts or basaltic glass. Based on the chemical variation observed in the edges of plagioclase microphenocrysts and basaltic glass, we estimate that the content of Si, Al and Fe in the edges of plagioclase microphenocrysts can have a variation of 10.69%, 17.59% and 109%, respectively. Similarly, the Si, Al and Fe concentrations in the edges of basaltic glass can have a variation of 9.79%, 16.30% and 37.83%, respectively, during the interaction of hydrothermal fluids and seafloor pillow basalt. |
| 关键词 | Hydrothermal Alteration Plagioclase Microphenocrysts Basaltic Glass Pillow Basalt East Pacific Rise Near 13 Degrees n |
| 学科领域 | Geology |
| DOI | 10.1007/s11430-014-4868-6 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000338269500001 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/23820 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China. |
| 作者单位 | Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Zeng ZhiGang,Qi HaiYan,Chen Shuai,et al. Hydrothermal alteration of plagioclase microphenocrysts and glass in basalts from the East Pacific Rise near 13 degrees N: An SEM-EDS study[J]. SCIENCE CHINA-EARTH SCIENCES,2014,57(7):1427-1437. |
| APA | Zeng ZhiGang,Qi HaiYan,Chen Shuai,Yin XueBo,Li ZhaoXue,&Zeng, ZG .(2014).Hydrothermal alteration of plagioclase microphenocrysts and glass in basalts from the East Pacific Rise near 13 degrees N: An SEM-EDS study.SCIENCE CHINA-EARTH SCIENCES,57(7),1427-1437. |
| MLA | Zeng ZhiGang,et al."Hydrothermal alteration of plagioclase microphenocrysts and glass in basalts from the East Pacific Rise near 13 degrees N: An SEM-EDS study".SCIENCE CHINA-EARTH SCIENCES 57.7(2014):1427-1437. |
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