The Geological Features of Ophiolites of Xiaohuangshan in Beishan Area,Inner Mongolia
Xiaohuangshan ophiolites outcropps in active continental margin,a great fault zone during the Early Paleozoic Era in northeastern edge of Talimud land mass.The ophiolite was mainly composed of serpentinite,peridotite,pyroxenite,gabbro,diabase and limestone,the features of major elements and REE of basic volcanic rocks were similar to the OIT,and the features of trace elements were similar to the IAT.It had the general characteristics of tectonic ophiolite mixtite.According to the outcropping scale and the rock-group,the forming tectonic environment showed that it was the outcome of island arc spreading,and formed during late Cambrian Epoch-early Ordovician Epoch.It was later superimposed and reconstructed during at least 4 age deformation-metamorphism,and moved to the earth's surface at late Devonian.