云南峨眉山高钛和低钛玄武岩的岩石成因

姜寒冰; 姜常义; 钱壮志; 朱士飞; 张蓬勃; 唐冬梅

云南峨眉山高钛和低钛玄武岩的岩石成因

- 1.
  西安地质矿产研究所,西安 710054；长安大学地球科学与国土资源学院，西安 710054
- 2.
  长安大学地球科学与国土资源学院，西安 710054
- 3.
  西安石油大学，西安 710065
- 4.
  中国矿业大学，徐州 221008
- 5.
  中国科学院地质与地球物理研究所，中国科学院矿产资源研究重点实验室，北京100029
基金项目:
国家自然科学基金重点项目（40534020）和云南省自然科学基金项目（2003D0016Z）

收稿日期: 2008-04-16

修回日期: 2008-09-25

刊出日期: 2009-05-31

Petrogenesis of high-Ti and low-Ti basalts in Emeishan, Yunnan, China

- 1.
  Xi’an Institute of Geology and mineral Resources, Xi’an 710054, China; College of Earth Science and Land Resourses, Chang’an University, Xi’an 710054, China
- 2.
  College of Earth Science and Land Resourses, Chang’an University, Xi’an 710054, China
- 3.
  Xi’an Shiyou University, Xi’an 710065, China
- 4.
  China University of Mining and Technology, Xuzhou 221008, China
- 5.
  Key Laboratory of Mineral Resources，Institute of Goelogy and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Received Date: 16 April 2008

Revised Date: 25 September 2008

Publish Date: 31 May 2009

摘要

摘要: 峨眉山玄武岩主要的岩石类型是低钛玄武岩和高钛玄武岩，并有少量的苦橄岩。它们不同程度地富集大离子亲石元素和轻稀土元素，相对亏损重稀土元素，稀土元素分馏明显或比较明显，相容元素（Co、V、Cr、Ni）显著亏损。低钛玄武岩浆受到陆壳物质的明显混染，高钛玄武岩浆也受到混染，但混染程度弱于低钛玄武岩浆。同化混染对Sr同位素和大离子亲石元素的影响程度大于对稀土元素和Nd同位素的影响程度。混染物是下地壳变质岩，也有少量上地壳物质。未受混染的样品具有适度亏损的Nd、Sr同位素。高钛玄武岩在岩浆演化过程中主要分离结晶相/堆晶相是单斜辉石，并有少量的斜长石。低钛玄武岩中，单斜辉石和斜长石的分离结晶作用是最主要的因素。低钛玄武岩的主体部分是在尖晶石稳定域与石榴石稳定域之间的过渡带熔融的；高钛玄武岩的主体部分是在石榴石稳定域内熔融的，极少部分是在尖晶石稳定域内熔融的。
- 峨眉山玄武岩 /
- 岩石学 /
- 岩石地球化学 /
- 岩浆过程 /
- 岩石成因
Abstract: The most main rock type of the Emeishan basalts are low-Ti basalts and high-Ti basalts, and has the few picrites. They enrich in LILE and LREE at different degrees, and deplete relatively to HREE, REE fractionate evidently, compatible elements (Co, V, Cr, Ni) deplete significantly.Low-Ti basalt magma was obviously contaminated by continent crust, in a larger extent than high-Ti basalt magma. And influences of contamination on Sr isotope and LILE are more evident than those on Nd isotope and REE. Nd and Sr isotope prove that contamination materials are mainly metamorphic rocks of lower continent crust, but also have minor rocks of upper continent crust. That the samples were not contaminated shows Nd and Sr isotopic compositions of moderately depleted mantle. Clinopyroxenes are main fractional crystallization phases/ accumulation phases, plagioclases are minor in differentiation processes of high-Mg tholeiitic magma. However, clinopyroxenes and plagioclases are main fractional crystallization phases/ accumulation phases of high-Mg transitional magma. Main body part of low-Ti basalts melted around the spinel-garnet transition zone；but main body part of high-Ti basalts melted within the garnet stability field，extremely few are partial melting within the spinel stability field.
- Emeishan basalt /
- Petrology /
- Petrogeochemistry /
- Magma process /
- Petrogenesis

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云南峨眉山高钛和低钛玄武岩的岩石成因

Petrogenesis of high-Ti and low-Ti basalts in Emeishan, Yunnan, China

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