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| 峨眉山高钛玄武岩物源的不均一性研究 | |
| 引用本文： | 严再飞,黄智龙,程礼军,许成,陈觅.峨眉山高钛玄武岩物源的不均一性研究[J].矿物岩石,2007,27(4):60-65. |
| 作者姓名： | 严再飞 黄智龙 程礼军 许成 陈觅 |
| 作者单位： | 1. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州,贵阳,550002;中国科学院研究生院,北京,100039 2. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州,贵阳,550002 3. 重庆煤田地质研究所,重庆,400042 4. 中国科学院研究生院,北京,100039 |
| 基金项目： | 国家自然科学基金(批准号:40372048和40573036) |
| 摘 要： | 对二滩地区高钛玄武岩物源研究表明,该区岩石可分为高钛-1和高钛-2两种岩石类型。其反映了二滩高钛玄武岩浆物源的不均一性,这种不均一性主要表现在:1)微量元素Zr,Sr含量明显不同;2)部分熔融程度和熔融压力不同;3)岩浆的结晶分异不同;4)Pb同位素比值不同。这可能是深源地幔柱(来自核-幔边界或下地幔)在上升过程中携带的不同物质发生部分熔融所致。 |
| 关 键 词： | 高钛玄武岩 部分熔融程度 结晶分异 Pb同位素 源区不均一 |
| 文章编号： | 1001-6872（2007）04-0060-06 |
| 收稿时间： | 2006-10-17 |
| 修稿时间： | 2007-01-10 |
HETEROGENEITY OF SOURCE FOR EMEISHAN HIGH-Ti BASALTS |
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| YAN Zai-fei,HUANG Zhi-long,CHENG Li-jun,XU Cheng,CHENG Mi.HETEROGENEITY OF SOURCE FOR EMEISHAN HIGH-Ti BASALTS[J].Journal of Mineralogy and Petrology,2007,27(4):60-65. | |
| Authors: | YAN Zai-fei HUANG Zhi-long CHENG Li-jun XU Cheng CHENG Mi |
| Abstract: | Some new data of Pb isotopes from Ertan high-Ti basalts is presented in this paper.The study indicates that Ertan high-Ti(HT) basalts can be subdivided into HT-1 type and HT-2 type.This implies that sources of the Ertan HT basalts are heterogeneous.This heterogeneity is mainly:1) contents of Zr and Sr for HT-1 and HT-2 are significantly defferent;2) HT-1 and HT-2 have different degrees of partial melting;3) HT-1 and HT-2 have undergone different processes of magmatic evolution,their trends of fractional crystallization are different;4) ratios of Pb isotopes between HT-1 and HT-2 are different.This is probably related to mantle plumes(from core-mantle boundary layers or lower mantle).When plumes rose and carried different materials at different mantle depth,these materials underwent distinct degrees of partial melting,resulted in the differences for HT-1 and HT-2 basalts. |
| Keywords: | Ertan high-Ti basalts degree of partial melting fractional crystallization Pb isotope heterogeneity of source |
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