| 中国东部新生代玄武岩中巨晶矿物的地球化学 |
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| 引用本文： | 陈道公,夏群科,支霞臣. 中国东部新生代玄武岩中巨晶矿物的地球化学[J]. 地球学报, 1997, 18(3): 299-305 |
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| 作者姓名： | 陈道公 夏群科 支霞臣 |
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| 作者单位： | 中国科技大学地球及空间科学系，第三世界科学院地球科学及天文学高级研究中心;中国科技大学地球及空间科学系，第三世界科学院地球科学及天文学高级研究中心;中国科技大学地球及空间科学系，第三世界科学院地球科学及天文学高级研究中心 |
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| 摘 要： | 本文对安徽女山、河北汉诺坝和广东普宁碱性玄武岩中的单斜辉石和角闪石巨晶进行了主要元素、稀土元素、微量元天和Ｓｒ＿Ｎｄ同位素的综合分析。数据显示产出于３个研究区的单斜辉石巨晶有３类：Ａｌ普通辉石、透辉石和Ｆｅ＿Ｎａ透辉石。普宁地区的角闪石巨晶乃世界上罕见的绿钙闪石巨晶。女山和普宁的单斜辉石和角闪石巨晶是碱性玄武岩浆在幔源高压下的结晶产物；汉诺坝的单斜辉石巨晶既可以是碱性玄武岩浆又可以是拉斑玄武岩浆的高压结晶体。所有巨晶相对于寄主岩者属于偶然捕掳晶。巨晶的形成符合“流动结晶模式”。它们与共存的橄榄岩色体无成因
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| 关 键 词： | 巨晶 玄武岩 地球化学 |
Geochemistry of Megacrysts in Cenozoic Basalts of Eastern China |
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| CHEN Dao-gong,XIA Qun-ke and ZHI Xia-chen. Geochemistry of Megacrysts in Cenozoic Basalts of Eastern China[J]. Acta Geoscientica Sinica, 1997, 18(3): 299-305 |
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| Authors: | CHEN Dao-gong XIA Qun-ke ZHI Xia-chen |
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| Affiliation: | Department of Earth and Space Sciences, University of Science and Technology of China; Advanced Research Centre of Earth Science and Astronomy, The Third World Acdemy of Science, Hefei;Department of Earth and Space Sciences, University of Science and Technology of China; Advanced Research Centre of Earth Science and Astronomy, The Third World Acdemy of Science, Hefei;Department of Earth and Space Sciences, University of Science and Technology of China; Advanced Research Centre of Earth Science and Astronomy, The Third World Acdemy of Science, Hefei |
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| Abstract: | Results of major ,REE and trace elements and Sr_Nd isotopes of amphibole and clinopyroxene megacrysts from Nushan,Hannuoba and Puning have been given.There are three types of CPX megacrysts in research areas: Al_augite,diopside and Fe_Na diopside.Hastingsite megacrysts from Puning are very rare in the world .CPX and amphibole megacrysts are crystallizic products of basaltic magma at mantle pressure.All of them are xenocrysts.Megacrysts represent cumulates of flow crystallization by basaltic magma .They have no genetic relatins with green xenoliths and probably represent the cognate with some of the black xenoliths. |
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| Keywords: | megacryst basalt geochemistry |
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