东秦岭商丹地区蛇绿岩中的角闪石研究
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国家自然科学基金资助。


A Study of Amphibole from the Ophiolites in Shangnan-Danfeng Area, East Qinling
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    摘要:

    东秦岭蛇绿岩主要分布在北秦岭南缘、商丹断裂带以北的狭窄地带,断续逶迤呈带状作近东西向展布。分布于商丹地区的蛇绿岩是东秦岭蛇绿岩带的重要组成部分并具有代表性。 本文着重论述了商丹地区蛇绿岩中广泛分布的主要造岩矿物之一,角闪石的主要特征组份、微量元素、晶胞参数、阳离子占位度等成因矿物学特点。并据此说明了该蛇绿岩中的角闪石属于区域正变质的产物;形成的物质来源具有同源性,原岩为超镁铁质-镁铁质的岩浆岩和火山熔岩;形成的热力学条件基本相同,变质程度为绿帘角闪岩相或角闪岩相,变质温度为610℃左右,压力大于5×10~8Pa。 此外,根据商丹地区蛇绿岩中角闪石成因矿物学特征之相同性所提供的信息表明,东秦岭蛇绿岩带是华北和扬子两个板块俯冲、碰撞的构造边界变质带。

    Abstract:

    The ophiolites of east Qinling are mainly distributed within a narrow zone lying along the southern fringe of east Qinling and to the north of Shangnan-Danfeng fault zone, winding nearly latitudinally as a discontinuous belt. The ophiolites in Shangnan一anfeng area make up an important and typical component part of this belt. This paper deals emphatically with the genetic mineralogical characteristics of amphibole, an important rock-forming mineral extensively-distributed in ophio- lites of Shangnan-Danfeng area, including its main characteristic components,trace elements, lattice cell parameters and cationic occupancy. On such a basis,it is demonstrated that (1) the amphibole in the ophiolites is a product of regional orthometamorphism, (2) the material sources thus formed show consanguinity,and the original rocks are ultramafic-mafic magmatic rocks and volcanic lava, and (3) being under basically identical thermodynamic condition, the metamorphism belongs to epidote-amphibolite facies or amphibolite facies, with the metamorphic temperature being 610℃ or so and pressure higher than .5× 108 Pa. In addition, the similarity in genetic mineralogical characteristics between various amphiboles from ophiolites of Shangnan-Danfeng area suggests that the ophiolite zone of east Qinling is the metamorphic belt of a tectonic margin resuping from the subduction and collision of North China plate and Yangtze plate.

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白学让,原莲肖,1990,东秦岭商丹地区蛇绿岩中的角闪石研究[J].岩石矿物学杂志,9(2):137~147. Bai Xuerang Yuan Lianxiao,1990,A Study of Amphibole from the Ophiolites in Shangnan-Danfeng Area, East Qinling[J]. Acta Petrologica et Mineralogica,9(2):137~147.

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