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新疆阿尔太山中段山前地区,是指西起阿勒太镇以西,东至沙尔布拉克以东,长七十余公里,宽二十余公里的狭长地区。这个地区在构造上,位于阿勒太复式向斜近槽部的位置。其南翼在阿勒太附近可见明显向北转折,由于断裂的切割,不见向斜的完整形象。此向斜南接达罕尔第一克兹加尔背斜,其核部受强烈的混合岩化;北邻哈龙背斜,其核部有大片花岗岩侵入。这个地区出露的地层为泥盆纪和志留纪两个时代的地层。泥盆系地层由变质的火山碎屑岩、熔岩、砂页岩与大理岩组成,局部有混合岩化,总厚度7500公尺。志留系地层由变质的砂页岩组成,普遍受强烈的混合岩化,形成各种类型的混合岩,总厚度9000多公尺。这
The foreland region in the middle of Altay Mountains in Xinjiang refers to the long and narrow area of more than 70 kilometers long and 20 kilometers wide east of Altai to the east of Shalbuluk in the west. This area is structurally located at the near-trough section of the Alerian syncline. Its southern wing shows a marked northward transition near Aleta, with no complete syncline image due to the cutting of faults. This syncline southward reaches the first Kezijar anticline in Dahan, and its core is strongly mixed and petrified. On its north side, the halon anticline has large-scale granite intrusions in its core. The strata exposed in this area are strata of the Devonian and Silurian periods. The Devonian strata are composed of metamorphic volcaniclastic rocks, lava, sand shale and marble, and are partially migmatitic with a total thickness of 7500 meters. The Silurian strata are composed of metamorphosed sand shale and are generally strongly mixed with rocks to form various types of mixed rocks with a total thickness of over 9,000 meters. This