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红山岩体位于西准噶尔地区东南部,是达尔布特构造带中的主要岩体之一,由碱长花岗岩、正长花岗岩、黑云母正长花岗岩、二长花岗岩、花岗闪长岩和闪长岩组成。于其中的二长花岗岩中采样获得的锆石颗粒发育规则的韵律环带,具有较高的Th/U比值(范围0.34～0.53),属于典型岩浆成因锆石。LA-ICP-MS测试获得岩体的侵位结晶年龄为309.3±3.8 Ma(n=13,MSWD=2.3),时代为晚石炭世,这与西准噶尔后碰撞深成岩浆活动的范围(340～275 Ma)相吻合。它论证了西准噶尔地块在海西晚期后碰撞伸展的观点。
The Hongshan pluton is located in the southeastern part of the West Junggar region and is one of the main rock masses in the Darbot tectonic belt. It is composed of alkali-bearing granite, orthoclase granite, biotite-bearing granite, monzonitic granite, granodiorite and Composed of diorite. The rhythmic zone of zircon granulometry obtained from sampling in the monzogranite has a high Th / U ratio (range 0.34-0.53), belonging to the typical magmatic zircon. The emplacement age of the rock masses obtained by LA-ICP-MS was 309.3 ± 3.8 Ma (n = 13, MSWD = 2.3) and the age was Late Carboniferous, which was in line with the range of post-collisional deep magmatic activity in western Junggar (340-275 Ma) match. It demonstrates the view that the western Junggar block collided and extended after the late Hercynian.