论文部分内容阅读
Ｋａｌａｒｓｋｙ岩体是沿阿尔丹南部边缘分布的规模巨大的ＤｊｕｇｄｊｕｒＫａｌａｒｓｋｙ辉长－斜长岩岩带的一部分。本文研究了代表典型地球早期（前寒武纪）发展史、在行星水准上发育的这个特殊杂岩体的构造－物质组分、形成的阶段性及其继后构造演化。辉长－斜长岩杂岩体产于前寒武纪克拉通化地块交接处及其褶皱的流动性较高的框架中。该杂岩体由两个岩浆岩共生组合组成：硅铝质（斜长岩及辉长－斜长岩）及镁铁质（基性－超基性岩）。体积上前者明显小于后者。这两个岩石共生组合的锶同位素比值都特别低，说明其原始岩浆的地幔属性，是在一个相对宁静的背景中在早期分异出来的产物。辉长－斜长岩杂岩体的演化明显分３个阶段：早期是圈闭结晶岩并将其极度加热的阶段，是庞大的具对称构造的地块的形成阶段；中期是地块的最终固结阶段，在此期间发生了褶皱变形，是高压变质作用的初期阶段；晚期是发生刚性变形，形成辉长－斜长杂岩岩体的岩浆岩岩墙群、链状构造及雁行构造，并发生最大高压变质作用的阶段。文中对与辉长－斜长岩杂岩体共生的似榴辉岩也进行了探讨。
The Kalarsky massif is part of the huge Djugdjur-Kalarsky gabbro-anorthite belt that spreads along the southern edge of Althin. This paper studies the tectonic-matter composition, formation stage and subsequent tectonic evolution of this special complex formed on planetary level, which represents the history of the typical early Earth (Precambrian) evolution. The gabbro-plagioclase complex occurs in the framework of the higher mobility of the folds and the junction of the Precambrian cratonization block. The complex consists of two magmatic rocks symbiotic assemblages: Si-Al (plagioclase and gabbro-plagioclase) and mafic (mafic-ultrabasic rocks). The former is obviously smaller than the latter in volume. The ratio of strontium isotopes of these two rock assemblages is extremely low, indicating the mantle attribute of the original magma was the product of early differentiation in a relatively quiet background. The evolution of the gabbro-plagioclase complex is obviously divided into three stages: in the early stage, the stage of trapping the crystalline rocks and heating them extremely is the formation phase of a large symmetrical structure; and the middle stage is the final stage of the block During the consolidation stage, fold deformation took place during the initial stage of high-pressure metamorphism. In the late stage, rigid deformation occurred to form magmatic dikes, chain structures and geesetride structures of the gabbro-plagioclase complex, And the stage of maximum high-pressure metamorphism occurs. The eclogitic eclogites also symbiotic with the gabbro-plagioclase complex are also discussed.