Plate subduction, oxygen fugacity, and mineralization
文献类型：CNKI期刊论文
| 作者 | LIU He; LIAO Renqiang ; ZHANG Lipeng; LI Congying; SUN Weidong
|
| 发表日期 | 2020-01-15 |
| 出处 | Journal of Oceanology and Limnology
 |
| 关键词 | plate subduction oxygen fugacity ore deposits geochemical behaviors subduction factory |
| 英文摘要 | Plate subduction is the largest natural factory that processes elements, which controls recycling and mineralization of a variety of elements. There are three major ore deposit belts in the world: the circumPaci?c, the central Asian, and the Tethys belts. All the three belts are closely associated with plate subductions, the mechanism remains obscure. We approached this problem from systematic studies on the behaviours of elements during geologic processes. This contribution summaries the recent progress of our research group. Our results suggest that porphyry Cu deposits form through partial melting of subducted young oceanic crust under oxygen fugacities higher than ? FMQ ～+1.5, which is promoted after the elevation of atmospheric oxygen at ca. 550 Ma. Tin deposits are associated with reducing magmatic rocks formed as a consequence of slab rollback. The Neo-Tethys tectonic regime hosts more than 60% of the world's total Sn reserves. This is due to the reducing environment formed during the subduction of organic rich sediments. For the same reason, porphyry Cu deposits formed in the late stages during the closure of the Neo-Tethys Ocean. Tungsten deposits are also controlled by slab rollback, but is not so sensitive to oxygen fugacity. Subduction related W/Sn deposits are mostly accompanied by abundant accessory ?uorites due to the breakdown of phengite and apatite. Decomposition of phengite is also signi?cant for hard rock lithium deposits, whereas orogenic belt resulted from plate subduction promote the formation of Li brine deposits. Cretaceous red bed basins near the Nanling region are favorable for Li brines. Both Mo and Re are enriched in the oxidationreduction cycle during surface processes, and may get further enriched once Mo-, Re-enriched sediments are subducted and involved in magmatism. During plate subduction, Mo and Re fractionate from each other. Molybdenum is mainly hosted in porphyry Mo deposits and to a less extent, porphyry Cu-Mo deposits, whereas Re is predominantly hosted in porphyry Cu-Mo deposits and sedimentary sul?de deposits. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Key R&D Program of China(No.2016YFC0600408) |
| 卷 | v.38期:01页:66-76 |
| 语种 | 英文; |
| 分类号 | P612;P542 |
| ISSN号 | 2096-5508 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/188345]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.CenterforOceanMega-Science,ChineseAcademyofSciences 2.UniversityofChineseAcademyofSciences 3.KeyLaboratoryofMarineGeologyandEnvironment,CenterofDeep-SeaResearch,InstituteofOceanology,ChineseAcademyofSciences 4.LaboratoryforMarineMineralResources,LaboratoryforMarineBiologyandBiotechnology,PilotNationalLaboratoryforMarineScienceandTechnology |
| 推荐引用方式 GB/T 7714 | LIU He,LIAO Renqiang,ZHANG Lipeng,et al. Plate subduction, oxygen fugacity, and mineralization. 2020. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。