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| 峨眉山大火成岩省“高钛玄武岩”和“低钛玄武岩”成因探讨 | |
| 引用本文： | 郝艳丽 张招崇 王福生 JohnJ.MAHONEY.峨眉山大火成岩省“高钛玄武岩”和“低钛玄武岩”成因探讨[J].地质论评,2004,50(6):587-592. |
| 作者姓名： | 郝艳丽 张招崇 王福生 JohnJ.MAHONEY |
| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037 2. 中国地质科学院地质研究所,北京,100037;中国地质大学,北京,100083 3. School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822, USA |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)，国土资源部优秀青年计划，40273020，G1999043205，，，， |
| 摘 要： | 大量的岩石化学资料分析表明，峨眉山大火成岩省玄武岩的TiO2含量是连续变化的，不存在明显的间断。野外地质特征表明高钛和低钛玄武岩既不存在空间分带，也不存在时间分带。其Sr、Nd和Pb同位素组成也没有明显的区别，推测它们可能是同源岩浆分离结晶的产物。根据MgO和TiO2的相关关系，可将苦橄岩和玄武岩的演化划分为4个趋势，并采用分离结晶模式对其进行了成因模拟，表明高钛和低钛玄武岩是同—母岩浆(苦橄—玄武岩浆)通过不同矿物相分离结晶的产物。 |
| 关 键 词： | 玄武岩 峨眉山大火成岩省 成因探讨 分离结晶 Pb同位素 空间分带 苦橄岩 母岩 连续变化 含量 |
Petrogenesis of High-Ti and Low-Ti Basalts from the Emeishan Large Igneous Province |
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| HAO Yanli ,ZHANG Zhaochong,WANG Fusheng ,John J. MAHONEY Institute of Geology,Chinese Academy of Geological Sciences,Beijing, China University of Geosciences,Beijing, School of Ocean and Earth Science and Technology,University of Hawaii,Honolulu,HI,USA.Petrogenesis of High-Ti and Low-Ti Basalts from the Emeishan Large Igneous Province[J].Geological Review,2004,50(6):587-592. | |
| Authors: | HAO Yanli ZHANG Zhaochong WANG Fusheng John J MAHONEY Institute of Geology Chinese Academy of Geological Sciences Beijing China University of Geosciences Beijing School of Ocean and Earth Science and Technology University of Hawaii Honolulu HI USA |
| Abstract: | Analyses of basalts from the Emeishan large igneous province show that the TiO 2 contents of them are variable continuously. And outcrops of high Ti and low Ti basalts in field are unzoned spatiotemporally. The similar Sr, Nd and Pb isotopic compositions of these two types of basalts indicate that they are comagmatic igneous rocks. The MgO versus TiO 2 diagram for picrites and basalts shows four evolution trends, whose geneses were simulated by the fractional crystallization model. The result suggests that high Ti and low Ti basalts are different products of the same parent magma (picritic basaltic magma) through fractional crystallization of different minerals. |
| Keywords: | high Ti and low Ti basalts fractional crystallization evolution trend petrogenesis Emeishan large igneous province |
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