| Mineral chemistry and its genetic significance of olivine in Cenozoic basalts from the South China Sea | |
| Yan QuanShu1,2; Shi XueFa; Wang KunShan; Bu WenRui | |
| 2007-11-01 | |
| 发表期刊 | ACTA PETROLOGICA SINICA
 |
| ISSN | 1000-0569 |
| 卷号 | 23期号:11页码:2981-2989 |
| 文章类型 | Article |
| 摘要 | We dredged lots of Cenozoic basalts from areas covered from the northern sub-slope to the southern sub- slope of the South China Sea. Based on the study on mineral chemistry of clinopyroxenes in these Cenozoic hasalts, this paper indicates that pyroxenes are mostly enstatite and a few of augite, sahlite and Ca-rich pyroxene. Pyroxene microlite has higher content in, Ca, Ti and Fe than pyroxene phenocryst, it may reflect that the evolution trend of host magma of pyroxene is coincidence with that of alkali rock series. The depth of magma chambers which calculated from equilibrium temperatures and pressures between clinopyroxene and melt are as follows, that of magma of tephrite is about 49km, that of magma of trachybasalt is about 25km, and that of magma of basalt is about 15km. Correspondingly, Equilibrium temperatures( K) of three types rocks mentioned above gradually decrease from 1535 1498 to 1429 to 1369. By using discriminant plot which developed from pyroxene and alkali discriminant diagram of host rock, Cenozoic basalt from the South China Sea belongs to intraplate alkali basalt. The results suggest that alkali basalt series in the study area may be the products of continuous evolution of mantle plume, which result from some physical and chemistry process including partial melting and fractional crystallization of mantle plume during the course of its ascent to the surface.; We dredged lots of Cenozoic basalts from areas covered from the northern sub-slope to the southern sub- slope of the South China Sea. Based on the study on mineral chemistry of clinopyroxenes in these Cenozoic hasalts, this paper indicates that pyroxenes are mostly enstatite and a few of augite, sahlite and Ca-rich pyroxene. Pyroxene microlite has higher content in, Ca, Ti and Fe than pyroxene phenocryst, it may reflect that the evolution trend of host magma of pyroxene is coincidence with that of alkali rock series. The depth of magma chambers which calculated from equilibrium temperatures and pressures between clinopyroxene and melt are as follows, that of magma of tephrite is about 49km, that of magma of trachybasalt is about 25km, and that of magma of basalt is about 15km. Correspondingly, Equilibrium temperatures( K) of three types rocks mentioned above gradually decrease from 1535 1498 to 1429 to 1369. By using discriminant plot which developed from pyroxene and alkali discriminant diagram of host rock, Cenozoic basalt from the South China Sea belongs to intraplate alkali basalt. The results suggest that alkali basalt series in the study area may be the products of continuous evolution of mantle plume, which result from some physical and chemistry process including partial melting and fractional crystallization of mantle plume during the course of its ascent to the surface. |
| 关键词 | Clinopyroxene Mineral Chemistry Genetic Significance Cenozoic Basalt South China Sea |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000254139500028 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/6196 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.State Ocean Adm, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, 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 | Yan QuanShu,Shi XueFa,Wang KunShan,et al. Mineral chemistry and its genetic significance of olivine in Cenozoic basalts from the South China Sea[J]. ACTA PETROLOGICA SINICA,2007,23(11):2981-2989. |
| APA | Yan QuanShu,Shi XueFa,Wang KunShan,&Bu WenRui.(2007).Mineral chemistry and its genetic significance of olivine in Cenozoic basalts from the South China Sea.ACTA PETROLOGICA SINICA,23(11),2981-2989. |
| MLA | Yan QuanShu,et al."Mineral chemistry and its genetic significance of olivine in Cenozoic basalts from the South China Sea".ACTA PETROLOGICA SINICA 23.11(2007):2981-2989. |
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