| 西藏错那洞电气石花岗岩中电气石化学组成、硼同位素特征及意义 |
| |
| 引用本文： | 代作文,李光明,丁俊,张林奎,曹华文,张志,梁维.西藏错那洞电气石花岗岩中电气石化学组成、硼同位素特征及意义[J].地球科学,2019,44(6):1849-1859. |
| |
| 作者姓名： | 代作文 李光明 丁俊 张林奎 曹华文 张志 梁维 |
| |
| 作者单位： | 1.成都理工大学地球科学学院, 四川成都 610059 |
| |
| 基金项目： | 扎西康铅锌-稀有资源基地深部探测与勘查示范项目2018YFC0604103 |
| |
| 摘 要： | 为了对西藏错那洞电气石花岗岩源区进一步约束,利用显微镜、电子探针和激光剥蚀多接收等离子质谱仪,对错那洞电气石花岗岩中电气石的形态、成分及硼同位素组成进行了研究.结果表明,错那洞电气石花岗岩中的电气石为碱族黑/铁电气石,直接结晶自富硼熔体,与熔体之间未发生明显的硼同位素分馏.电气石δ11B值主要在-6.91‰^-9.17‰之间,与大陆地壳平均δ11B值(-10‰±3‰)相近,表明错那洞电气石花岗岩主要源自变质沉积岩的部分熔融.然而,与起源于变质沉积岩的花岗岩相比,样品的δ11B值明显偏高,而与前人报道的雅拉香波淡色花岗岩(源自石榴石角闪岩部分熔融)的δ11B值相似.因此,错那洞电气石花岗岩源区中,除了变质沉积岩外,可能还混入了少量石榴石角闪岩.
|
| 关 键 词： | 西藏 喜马拉雅 错那洞 淡色花岗岩 电气石 硼同位素 岩石学 壳源 |
| 收稿时间： | 2018-07-20 |
Chemical and Boron Isotopic Composition,and Significance of Tourmaline from the Cuonadong Tourmaline Granite,Tibet |
| |
| Dai Zuowen,Li Guangming,Ding Jun,Zhang Linkui,Cao Huawen,Zhang Zhi,Liang Wei.Chemical and Boron Isotopic Composition,and Significance of Tourmaline from the Cuonadong Tourmaline Granite,Tibet[J].Earth Science-Journal of China University of Geosciences,2019,44(6):1849-1859. |
| |
| Authors: | Dai Zuowen Li Guangming Ding Jun Zhang Linkui Cao Huawen Zhang Zhi Liang Wei |
| |
| Institution: | (College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China;Chengdu Center,China Geological Survey,Chengdu 610081,China) |
| |
| Abstract: | In order to further constrain the source of the Cuonadong tourmaline granite, Tibet, morphology, chemical and isotopic composition of the tourmaline were studied by means of the microscope, electron probe, laser ablation multi-collector inductively coupled plasma mass spectrometer. The results indicate that the tourmaline from the Cuonadong tourmaline granite belongs to alkali group, and is schorl, which crystallized from boron-rich melts, indicating no obvious boron isotope fractionation between tourmaline and the melts has occurred.δ11B values of the tourmaline from the Cuonadong tourmaline granite range from-6.91‰ to-9.17‰, which are close to the average δ11B value (-10‰ ±3‰) of the continental crust, implying that the Cuonadong tourmaline granite was derived from partial melting of metasedimentay rock. However, δ11B values of the tourmaline from the Cuonadong tourmaline granite is much higher relative to granites derived from metasedimentary rock, and similar to δ11B values of Yardoi leucogranite reported by previous research, which was originated from garnet-amphibolite. Thus, besides metasedimentary rock, there was probably a small amount of garnet-amphibolite present in the source region of the the Cuonadong tourmaline granite. |
| |
| Keywords: | Tibet Himalaya Cuonadong leucogranite tourmaline Boron isotope petrology crust source |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
| 点击此处可从《地球科学》下载免费的PDF全文 |
|
