| Petrogenesis of peralkaline rhyolites in an intra-plate setting: Glass House Mountains, southeast Queensland, Australia | |
Shao, Fengli1,2 ; Niu, Yaoling1,2,3; Regelous, Marcel4; Zhu, Di-Cheng2
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| 2015-02-01 | |
| 发表期刊 | LITHOS
 |
| 卷号 | 216页码:196-210 |
| 文章类型 | Article |
| 摘要 | We report petrological and geochemical data on coeval trachybasalts, syenites with enclaves, trachytes, peralkaline rhyolites and peraluminous rhyolites from the Glass House Mountains-Maleny-Noosa area, southeast Queensland, Australia. This rock association and the unique characteristics of the peralkaline rhyolites offer convincing lines of evidence that the petrogenesis of the peralkaline rhyolites is a straightforward consequence of protracted fractional crystallization from basaltic melts of alkali-rich composition. Compared to the common peraluminous rhyolites elsewhere, the peralkaline rhyolites here are characterized by elevated abundances of most incompatible elements, especially the very high Nb (vs. Th) and Ta (vs. U), the very low Ba, Sr and Eu and the extremely high Sr-87/Sr-86 ratio. The high Nb and Ta are inherited from the parental alkali basaltic melts. The low Ba, Sr and Eu result from removal of plagioclase during the protracted fractional crystallization. These rocks altogether define a Rb-Sr isochron of similar to 28 Ma, which is similar to Ar-Ar age data on these rocks in the literature. The extremely high Sr-87/Sr-86 ratio of the peralkaline rhyolites (up to 1.88) is actually characteristic of peralkaline rhyolites because of extreme Sr (also Eu and Ba) depletion and thus the very high Rb/Sr ratio. That is, the Sr in these rocks is essentially radiogenic Sr-87 accumulated from the Rb-87 decay since the volcanism. We suggest that the petrogenesis of the peralkaline rhyolites from the Glass House Mountain area may be of general significance globally. |
| 关键词 | Peralkaline Rhyolites High Nb And Ta Very High Sr Isotope Ratios Daly Gap Glass House Mountains Southeast Queensland |
| DOI | 10.1016/j.lithos.2014.12.015 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000353851300014 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/26963 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 4.Univ Erlangen Nurnberg, GeoZentrumNordbayern, D-91054 Erlangen, Germany |
| 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 | Shao, Fengli,Niu, Yaoling,Regelous, Marcel,et al. Petrogenesis of peralkaline rhyolites in an intra-plate setting: Glass House Mountains, southeast Queensland, Australia[J]. LITHOS,2015,216:196-210. |
| APA | Shao, Fengli,Niu, Yaoling,Regelous, Marcel,&Zhu, Di-Cheng.(2015).Petrogenesis of peralkaline rhyolites in an intra-plate setting: Glass House Mountains, southeast Queensland, Australia.LITHOS,216,196-210. |
| MLA | Shao, Fengli,et al."Petrogenesis of peralkaline rhyolites in an intra-plate setting: Glass House Mountains, southeast Queensland, Australia".LITHOS 216(2015):196-210. |
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