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西南天山东德沟镁铁-超镁铁岩中尖晶石的矿物学特征及其地质意义
引用本文:孔凡梅,李旭平,李守军,吴苏.西南天山东德沟镁铁-超镁铁岩中尖晶石的矿物学特征及其地质意义[J].岩石矿物学杂志,2011,30(5):951-960.
作者姓名:孔凡梅  李旭平  李守军  吴苏
作者单位:山东科技大学地质科学与工程学院,山东省沉积成矿作用与沉积矿产重点实验室,山东青岛266510
基金项目:国家自然科学基金资助项目(40973022); 国家973项目(2009CB825007)
摘    要:中国西南天山东德沟镁铁-超镁铁岩出露于天山伊犁-中天山板块和塔里木板块之间的碰撞造山带中,岩石类型主要为(方辉)橄榄岩,且普遍经历了含水流体(熔体)的渗透交代作用,含有形态和成分变化复杂的尖晶石,表现为从红褐色到黄褐色、再到深绿色和浅绿色,尖晶石的Cr2O3和FeO的含量依次降低,Al2O3和MgO的含量逐渐增高。研究认为红褐色和黄褐色的铬尖晶是原生矿物,而绿色的镁铝尖晶石为次生矿物。原生铬尖晶石的Cr#为0.41~0.87,Mg#为0.21~0.61,且成分变化大,显示其可能具多期熔融的复杂成因;次生绿色的尖晶石形态不一、成分相对有较大变化,表明其至少形成于两个期次的变质作用或流体交代过程。原生铬尖晶石具有SSZ环境橄榄岩的特征,指示其寄主岩石可能是俯冲上板片地幔楔岛弧环境的橄榄岩残片。

关 键 词:西南天山  橄榄岩  铬尖晶石  镁铝尖晶石
收稿时间:2011/3/20 0:00:00
修稿时间:2011/8/1 0:00:00

Mineralogy of spinel from mafic-ultramafic rocks in Dongdegou, southwestern Tianshan and its geological significance
KONG Fan-mei,LI Xu-ping,LI Shou-jun and WU Su.Mineralogy of spinel from mafic-ultramafic rocks in Dongdegou, southwestern Tianshan and its geological significance[J].Acta Petrologica Et Mineralogica,2011,30(5):951-960.
Authors:KONG Fan-mei  LI Xu-ping  LI Shou-jun and WU Su
Institution:KONG Fan-mei,LI Xu-ping,LI Shou-jun and WU Su(Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals,Institute of Geological Science and Engineering,Shandong University of Science and Technology,Qingdao 266510,China)
Abstract:The mafic-ultramafic rocks of Dongdougou are located in the orogenic belt between the Tarim plate and the Yili-central Tianshan plate,southwestern Tianshan.Harzburgite is the main type of peridotite,generally metasomatized by hydrous melt or fluid.It includes different types of spinels,being red-brown,brown,dark green,and light green in color.Cr2O3 and FeO decrease gradually whereas Al2O3 and MgO increase with the metasomatism.Studies indicate that red-brown and brown picotiles constitute the primary type,w...
Keywords:southwestern Tianshan  peridotite  picotile  magnesium spinel  
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