| 辉南新生代玄武岩中捕虏体橄榄岩矿物化学与华北岩石圈地幔演化 |
| |
| 引用本文： | 鲁江姑,郑建平.辉南新生代玄武岩中捕虏体橄榄岩矿物化学与华北岩石圈地幔演化[J].地质学报,2011,85(3):330-342. |
| |
| 作者姓名： | 鲁江姑 郑建平 |
| |
| 作者单位： | 中国地质大学地球科学学院,地质过程与矿产资源国家重点实验室,武汉,430074 |
| |
| 基金项目： | 国家自然科学基金项目(90714002、40673002) |
| |
| 摘 要： | 内容提要：在对吉林辉南新生代玄武岩中捕虏体橄榄岩详细的岩相学和矿物主量元素研究基础上，重点分析了单斜辉石激光原位微量元素，并讨论了辉南陆下岩石圈地幔的性质及其在华北克拉通破坏过程中的意义。橄榄石、单斜辉石和尖晶石的Mg#和Cr#均表明该区陆下岩石圈地幔主体是饱满的，同时也存在少量过渡和难熔型地幔。单斜辉石REE配分形式包括LREE亏损、倒U字型REE和LREE富集等不同类型。这些橄榄岩是地幔经历不同程度的部分熔融作用(低于10%)和复杂地幔交代作用的产物。交代介质主体是硅酸盐熔体，但个别样品有碳酸岩熔体交代的残留。橄榄石Mg#和平衡温度无相关性，说明辉南陆下岩石圈地幔不存在明显的分层而是交叉的。这些地幔特征和华北东部其他地区新生代的主体地幔性质相似，是熔-岩反应、侵蚀作用和上涌软流圈物质冷却转变置换的综合结果。
|
| 关 键 词： | 橄榄岩 LA-ICP-MS 陆下岩石圈 地幔置换 吉林辉南 |
| 收稿时间： | 6/2/2009 12:00:00 AM |
| 修稿时间： | 2009/9/20 0:00:00 |
Mineral chemistry of peridotite xenoliths from Huinan Cenozoic basalts:Implication for evolution of lithospheric mantle beneath the North China Craton |
| |
| Lu Jianggu and Zheng Jianping.Mineral chemistry of peridotite xenoliths from Huinan Cenozoic basalts:Implication for evolution of lithospheric mantle beneath the North China Craton[J].Acta Geologica Sinica,2011,85(3):330-342. |
| |
| Authors: | Lu Jianggu and Zheng Jianping |
| |
| Institution: | State Kay Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences,China University of Geosciences(Wuhan),State Kay Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences,China University of Geosciences,Wuhan |
| |
| Abstract: | Abstract:Based on the detailed studies about petrology and major elements of peridotite xenoliths from Huinan (Jilin Province) Cenozoic basalts, in situ LA-ICP-MS trace element compositions of clinopyroxenes were analyzed. The natu re and evolution of the Cenozoic subcontinent lithospheric mantle (SCLM) benea th Huinan area at the north-east edge of the North China were discussed. Mg# and Cr# values of minerals (such as olivine, clinopyroxene and spinel) show the SCLM beneath the area is mainly fertile with minor transitional/refratory relicts. Chondrite-normalized REE patterns of clinopyroxenes widely vary from LREE-depleted, through convex-upward to LREE-enriched. The SCLM represents the products which have experienced different degrees of fractional partial melting (lower than 10%) and complicated mantle metosomatism. Most of the samples have been affected by silicate melt metasomatism with several samples as relicts of carbonatitic melt metasomatism. No correlation between Mg# in olivine and equilibration temperature suggests that there is no obvious stratification within the Huinan SCLM. These mantle characteristics, similar with that of the dominate Cenozoic mantle beneath other parts of the eastern North China, represent the comprehensive results that newly accreted materials replace the aged lithospheric mantle through melt-rock interaction /erosion and the coolin g of the upwelled asthenospere. |
| |
| Keywords: | peridotites LA-ICP-MS SCLM mantle replacement Huinan area in Jilin Province |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地质学报》浏览原始摘要信息 |
| 点击此处可从《地质学报》下载免费的PDF全文 |
