DISCOVERY AND SIGNIFICANCE OF THE QUENCH FRAGMENT LAVA IN YIXIAN FORMATION IN WESTERN LIAONING PROVINCE

During recent years' geologic study in Western Liaoning, the authors found broadly outcropping quenching pillow lavas formed in lake basin environment for the first time. The quenching fragment lavas are distributed in the upper part of Sihetun layer, the middle of Zhuanchengzi layer and the upper of Dakangpu layer of Yixian formation. They commonly occur associating with the sediment interbeds of different levels in the Yixian formation, thus their emplacing ages would represent those of the corresponding sediment interbeds. The discovery of the quenching pillow lava is significant in the study of evolution and volcanic-sedimentary activities of Yixian-Fuxin basin and Jinyang basin.