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Lemland侵入体是产于芬兰西南地区的四个造山期后花岗岩类侵入体之一,侵入体主要由斑状花岗岩和基一中性岩组成,它们显示出双峰式岩浆作用的性质,引起网脉化,形成混合岩. 近来对Lemland侵入体南边部分的研究揭示,基一中性岩形成一环状构造,在环状构造中,岩石可暂分为三个组合:(1)斑状花岗岩中的细粒镁铁质枕状体;(2)混杂基体中含镁铁质包体的混合岩;(3)中粒镁铁质岩。本文认为这种具不同单元的环状构造是从搅动的带状岩浆房中侵位形成的,而不同的岩石组合是由于岩浆的物化性质不同造成的. 岩浆间相互作用的过程,以基性岩浆侵入到上覆的酸性岩浆中,并在其中形成基性枕状体开始,在向上移动的过程中,在基性岩浆留在后面的地方,基性的和酸性的岩浆迅速地混染和混合,形成的混合岩浆侵入到镁铁质枕内,这种镁铁质枕在靠较冷的酸性岩浆一侧形成一隔离边。环状构造中部的中粒镁铁质岩被认为与细粒镁铁质岩为同一种岩石,其较粗的粒度取决于较长的结晶时间.这种岩石被混合岩浆回复脉入和角砾化,形成巨形角砾。在这之后,酸性岩浆继续活动,在镁铁质岩石和混合岩中形成切割的岩墙.
The Lemland Invader is one of four eocene granitic intrusions that originated in southwestern Finland. The intrusive body consists mainly of porphyritic granite and basement-one neutral rocks that show the nature of bimodal magmatism and cause the reticulation Recent studies of the southern part of the Lemland intrusion revealed that the basement-neutral rocks form a ring structure in which the rock can be temporarily divided into three assemblages: (1) Fine-grained mafic pillow; (2) mixed-mafic-hosted iron-bearing mafic rocks; and (3) medium-grained mafic rocks. This paper argues that the ring structure with different units is emplaced from the agitated zonal magma chamber and that the different rock assemblages are due to the different physicochemical properties of the magma.The process of interaction between magmas, Magma intrudes into the overlying acidic magma and begins with the formation of a base pillow in it. During the upward movement, where basic magmas remain behind, the basic and acidic magmas rapidly mix and The mixed magma formed intrudes into the mahogany pillow, which forms an isolated edge on the colder acid magma side. Medium-sized granitic mafic rocks in the central part of the ring structure are considered to be the same type of rock as fine-grained mafic rocks, and their coarser grain size is dependent on longer crystallization times, which are mixed in with magmatic intrusions and breccias The formation of giant breccias. After that, the acidic magma continued to form diced dikes in mafic and mixed rocks.