Mineral Chemistry Indicates the Petrogenesis of Rhyolite From The Southwestern Okinawa Trough
文献类型：CNKI期刊论文
| 作者 | CHEN Zuxing; ZENG Zhigang; WANG Xiaoyuan; ZHANG Yuxiang; YIN Xuebo; CHEN Shuai; MA Yao ; LI Xiaohui; QI Hanyan
|
| 发表日期 | 2017-12-06 |
| 出处 | Journal of Ocean University of China
 |
| 关键词 | geothermobarometry oxygen fugacity xenocrysts magma evolution rhyolite Okinawa Trough |
| 英文摘要 | To reveal the petrogenesis of rhyolite from the southwestern Okinawa Trough, the mineral chemistry of plagioclase, orthopyroxene, amphibole, quartz and Fe-Ti oxide phenocrysts were analyzed using an electron microprobe, and in suit Sr and Ba contents of plagioclase analysed by LA-ICPMS were chosen for fingerprinting plagioclases of different provenances. Results indicate an overall homogeneous composition for each of the mineral phases except for plagioclase phenocrysts which have a wide range of composition(An=39~88). Plagioclase crystals characterized by An contents of >70 are not in equilibrium with their whole-rock compositions, and coarse-sieved plagioclase phenocryst interiors record high An contents(>70) and Sr/Ba ratios(>7), which are similar to the those of plagioclase crystals in basalt. Therefore, these crystals must have been introduced to the rhyolitic magma from a more mafic source. Equilibrium temperatures estimated using orthopyroxene-liquid, iron–titanium oxide, titanium-in-quartz and amphibole geothermometers show consistent values ranging from 792 to 869℃. The equilibrium pressure calculated using amphibole compositions is close to 121 MPa which corresponds to an approximate depth of 4 km. The fO_2 conditions estimated from Fe-Ti oxides and amphiboles plot slightly above the NNO buffer, which indicates that the rock formed under more oxidized conditions. Our results suggests that petrogenesis of the rhyolite due to basaltic magma ascend with the high An and Sr/Ba plaigoclases from deep magma chamber into the shallow chamber where the fractional crystallization and crustal assimilation happened. It also indicates that a two-layer magma chamber structure may occur under the southwestern Okinawa Trough. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | supported by the National Key Basic Research Program of China(No.2013CB429700) ; the National Natural Science Foundation of China(Nos.41325021 and 41306053) ; the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA11030302) ; the Special Fund for the Taishan Scholar Program of Shandong Province(No.ts201511061) ; the AoShan Talents Program Supported by Qingdao National Laboratory for Marine Science and Technology(No.2015ASTP-0S17) ; the Innovative Talent Promotion Program(No.2012RA2191) ; the Science and Technology Development Program of Shandong Province(No.2013GRC31502) ; the Scientific and Technological Innovation Project Financially Supported by Qingdao National Laboratory for Marine Science and Technology(No.2015ASKJ03) ; the National High Level Talent Special Support Program ; the CAS/SAFEA International Partnership Program for Creative Research Teams ; the Qingdao Collaborative Innovation Center of Marine Science and Technology |
| 卷 | v.16期:06页:170-181 |
| 语种 | 英文; |
| 分类号 | P588.141;P736.3 |
| ISSN号 | 1672-5182 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/189076]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.UniversityofChineseAcademyofSciences 2.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 3.LaboratoryforMarineMineralResources,QingdaoNationalLaboratoryforMarineScienceandTechnology |
| 推荐引用方式 GB/T 7714 | CHEN Zuxing,ZENG Zhigang,WANG Xiaoyuan,et al. Mineral Chemistry Indicates the Petrogenesis of Rhyolite From The Southwestern Okinawa Trough. 2017. |
入库方式： OAI收割
来源：海洋研究所
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