攀枝花红格地区变质岩成因新认识

New explanation of the genesis of the metamorphic rocks in the Hongge region,Panzhihua,southwestern Sichuan

1∶5万区调发现,红格地区变质岩不是前震旦系区域变质岩,它与邻近的会理群变质岩特征有明显的不同,而与把关河地区震旦系上统把关河砂岩、观音崖组和灯影组在岩性组合特征、岩石化学特征和稀土元素特征方面比较,则有惊人的相似。它们是震旦系的沉积岩受华力西—印支期岩浆作用的影响而变质的热接触变质岩。

Unlike the adjacent Huili Group metamorphic rocks, the metamorphic rocks in the Hongge region, Panzhihua, southwestern Sichuan are not attributed to the pre-Sinian regional metamorphic rocks, as indicated by the 1 ： 50 000 geological survey. On the contrary, they bear a striking resemblance to the lithologic associations, lithochemistry and REE distribution patterns for the Upper Sinian Baguanhe sandstones, Guanyinya Formation and Dengying Formation. For these reasons, they should be interpreted as the thermal contact metamorphic rocks originated from the Sinian sedimentary rocks which were influenced by the Variscan Indosinian magmatism.