| 陕南碑坝安家山角闪质岩成因探讨 |
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| 引用本文： | 张仪娴.陕南碑坝安家山角闪质岩成因探讨[J].岩石矿物学杂志,1988,7(4):309-317. |
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| 作者姓名： | 张仪娴 |
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| 作者单位： | 四川建材学院非金属矿系 |
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| 摘 要： | 研究区位于陕南一川西北交界的米苍山中段。由元古代(火地垭群)变质岩系组成基底构造层,由上到下为铁船山组、麻窝子组及后河组,被晋宁期基性～酸性侵入岩切割,分布不连续。在基性侵入岩与麻窝子组硅质白云岩接触带及硅质白云岩捕虏体较多的基性岩体内部,同化～混染、交代作用明显,角闪质岩亦分布在基性岩体内部硅质白云岩捕虏体较多的部位或沿二者的接触带分布,后者规模较大。主要岩石类型有透辉角闪岩、含长角闪岩及斜长角闪岩,以透辉角闪岩为主。对该区角闪质岩的成因,前人认为属“基性岩浆结晶分异的产物”。笔者在野外详细观察研究的基楚上,通过室内详细鉴定及化学分析数据的计算对比,认为属同化～混染、交代型角闪质石。
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| 关 键 词： | 角闪质岩 同化—混染作用 交代作用 |
Research on Genesis of Amphibolite in Anja Shan, Beiba, Southern Shanxi |
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| Zhang Yixian.Research on Genesis of Amphibolite in Anja Shan, Beiba, Southern Shanxi[J].Acta Petrologica Et Mineralogica,1988,7(4):309-317. |
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| Authors: | Zhang Yixian |
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| Abstract: | The investigated district is located in the middle of the Micang Mountains
at the juncture of southern Shanxi and northwestern Sichuan. The bottom
Stratum in this district is proterozoic metamorphic rocks (Hadiya Group).
From top to bottom,there are Tiechuanshan Formation, Mawozi Forma-
tion and Houhe Formation, intruded and separated by basic and acidic magmas
of the Jinning stage. They are distributed discontinuously. Assimilation, cotami-
nation and metasomatism are clear along the contact zone of basic bodies with
siliceous dolomite and in places where basic bodies contain more xenolithes
of siliceous dolomite. The amphibolites are distributed along the contact zone
and found in the intrusive bodies with large quantities of siliceous dolomite xeno-
lith, and the tatter is larger in scale than the former. Among the main kinds of
amphibolite such as diopside amphibolite, olivine diopside amphibolite, feldspa-
thic amphibolite and amphibolite etc, diopside mpahibolite is the leading and
most important kind. In the past the cause of the forma ion of amphibolite in
this district was thought to be the products of crystallization of differentiation
of basic and intermediate magmas. After conscien tiously researching both
in the field and in the laboratory the present writer puts forward the theory
that amphibolite in the district is the result of" assimilation-contam-
ination-metasomatism". |
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| Keywords: | amphibolite assimilation-contamination metasomatism |
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