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首页> 外文期刊>Geodinamica Acta >Magnetic fabric of granitic composite pluton of the Velka Fatra Mountains (Western Carpathians, Slovakia): A Variscan remnant within the Alpine edifice?
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Magnetic fabric of granitic composite pluton of the Velka Fatra Mountains (Western Carpathians, Slovakia): A Variscan remnant within the Alpine edifice?

机译：Velka Fatra山脉（西部喀尔巴阡山脉，斯洛伐克）的花岗岩复合岩体的磁性结构：高山大厦中的Variscan残余物？

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摘要

The AMS study has been performed on various types of the basement - Variscan granitic and surrounding - Mesozoic sedimentary rocks in the Vel'ka Fatra Mountains, Tatric Superunit of the Central Western Carpathians. The Vel'ka Fatra Mts. provides good opportunity for AMS study because of composite S-type and I-type granite character of pluton and clear relations to Mesozoic sedimentary rocks in the cover and nappe positions. The granitic massif consists of the three types of weakly magnetic peraluminous granites (350 - 340 Ma in age), ranging from two-mica granites to biotite granodiorites in composition and carrying accessory monazite and ilmenite; whereby they resemble common S-type and/or Ilmenite Series granite. This pre-existing granitic body was intruded by relatively young (304 Ma old) metaluminous to subaluminous, strongly magnetic (due to magnetite) tonalitic intrusion of the 1-type and/or Magnetite Series granite. In all S-types investigated as well as in the 1-type tonalite body, the magnetic fabrics are not uniform, but slightly variable within a body and differing from body to body. The magnetic fabrics in all granitic rocks can be classified as mostly magmatic in origin, only subordinately affected by ductile deformation. The Alpine overprint of the magnetic fabric of the Variscan granite frequent in the central areas of the Central Western Carpathians was only weak in the Vel'ka Fatra Mts. and the magnetic fabrics of these granites thus mostly comprise the original Variscan magmatic fabrics. On the other hand, in the marginal parts of the Vel'ka Fatra Mts. the magnetic fabrics in granites are locally conformable to the deformational magnetic fabrics in surrounding sedimentary rocks (Mesozoic in age) thus indicating at least local effects of the Alpine deformation. The magnetic fabrics in Mesozoic sedimentary rocks covering the crystalline basement are partially (Cover Formation) to entirely (Nappe Units) deformational in origin.
机译：AMS研究已在中西部喀尔巴阡山脉的塔克拉特级超大构造的Vel'ka Fatra山脉的各种类型的地下室-Variscan花岗岩和周围环境-中生代沉积岩中进行。 Vel'ka Fatra山。岩体的复合S型和I型花岗岩特征以及与盖层和推覆位置中生代沉积岩的明确关系为AMS研究提供了很好的机会。花岗质地块由三种类型的弱磁高铝质花岗岩组成（年龄在350-340 Ma之间），从两云母花岗岩到黑云母花岗闪长岩，并携带附有独居石和钛铁矿。因此它们类似于普通的S型和/或钛铁矿系列花岗岩。这种预先存在的花岗岩体被相对较年轻的（304 Ma老）金属质侵入到1型和/或磁铁矿系列花岗岩的亚铝质，强磁性（由于磁铁矿）扁桃体侵入。在所研究的所有S型以及1型炸药主体中，磁性织物均不均匀，但在一个体内的变化不大，并且各个主体之间存在差异。所有花岗质岩石中的磁性构造可归类为岩浆成因，仅受韧性变形的影响。在中西部喀尔巴阡山脉的中部地区频繁出现的瓦里斯卡纳花岗岩磁性织物的高山套印仅在Vel'ka Fatra山上较弱。因此，这些花岗岩的磁性织物大部分是原始的Variscan岩浆织物。另一方面，在Vel'ka Fatra山的边缘地区。花岗岩中的磁性结构与周围沉积岩中的变形磁性结构（年龄上为中生代）局部相符，因此至少表明了高山变形的局部影响。覆盖结晶基底的中生代沉积岩中的磁性构造部分起源于（盖层）至全部（纳普单位）变形。

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