| 马里亚纳南部弧内坡橄榄岩中的角闪石成分对于弧下地幔交代流体的指示 |
| |
| 引用本文： | 董彦辉,初凤友,朱继浩,张平萍.马里亚纳南部弧内坡橄榄岩中的角闪石成分对于弧下地幔交代流体的指示[J].海洋学报,2011,33(5):91-96. |
| |
| 作者姓名： | 董彦辉 初凤友 朱继浩 张平萍 |
| |
| 作者单位： | 国家海洋局海底科学重点实验室,浙江 杭州 310012;国家海洋局 第二海洋研究所,浙江 杭州 310012 |
| |
| 基金项目： | 国家自然科学基金青年基金(40906037);国家海洋局第二海洋研究所基本科研业务费项目(JG0901,JT1001, JT1104);国家基础研究发展规划项目(2007CB41170301)的资助。 |
| |
| 摘 要： | 马里亚纳弧前的橄榄岩被认为是SSZ型蛇绿岩的现代等同物,记录了弧下地幔与俯冲流体的交代反应,其中的角闪石被认为是俯冲流体交代的产物.电子探针的数据表明角闪石主要包括透闪石和镁闪石两种,其中前者具有低的钠含量,后者则具有明显高的钠、铝含量,但Mg#较低.角闪石的组成反映了俯冲流体具有高硅、钙、铝、钠等元素的特征.形成成分...
|
| 关 键 词： | 马里亚纳 橄榄岩 地幔交代作用 角闪石 俯冲带 |
| 收稿时间： | 2009/12/30 0:00:00 |
The Amphibole in ultramafic rocks from southern Mariana trench inner slope: Implication for metasomatism in forearc setting |
| |
| DONG Yan-hui,CHU Feng-you,ZHU Ji-hao and ZHANG Pin-pin.The Amphibole in ultramafic rocks from southern Mariana trench inner slope: Implication for metasomatism in forearc setting[J].Acta Oceanologica Sinica (in Chinese),2011,33(5):91-96. |
| |
| Authors: | DONG Yan-hui CHU Feng-you ZHU Ji-hao and ZHANG Pin-pin |
| |
| Institution: | Key Laboratory of Submarine Geosciences, State Oceanic Administrtion, Hangzhou 310012,China;The Second Institute of Oceanography, State Oceanic Administrtion, Hangzhou 310012,China |
| |
| Abstract: | The peridotites in landward-slope of Mariana trench regarded as the analogue of ophiolites, record the metasomatism between subducting slab fluid and subarc mantle wedge. Amphiboles is a product of the metasomatism. Our EPMA data suggest that the amphiboles in south Mariana trench inner-slope mainly tremolite and magnesiohornblende with little edenite.Magnesiohornblende have lower Mg# and significantly high Na2O and Al2O3 related to tremolite. The component of amphibole expectially magnesiohornblende suggests the matasomatic fluid contain high Si, Ca, Al, Na but extremely low Ti. The component difference between tremolite and magnesiohornblende might be attributed to fluid origin from difference depth. Fluid from relative shallow may be rich in Si and Ca but dilute Al and Na, and the fluid which formed magnesiohornblende may be origin from deeper slab which release more Al and Na. |
| |
| Keywords: | Mariana trench Peridotite Sub-arc mantle metasomatism Amphibole subduction factory |
|
| 点击此处可从《海洋学报》浏览原始摘要信息 |
| 点击此处可从《海洋学报》下载免费的PDF全文 |
|
