<正> In NW Jiangxi Province, China, a rock characterized by volcanic-subvolcanic texture and structure was found. It has the same rock-forming mineral composition as the greisen, is rich in rare elements, but di...<正> In NW Jiangxi Province, China, a rock characterized by volcanic-subvolcanic texture and structure was found. It has the same rock-forming mineral composition as the greisen, is rich in rare elements, but different in chemical ingredients from any known unreplaced magmatic rocks, including ongonite. By K-Ar dating its age is 118×10~6 yr. Evidently the rock might be regarded as a new igneous rock.展开更多
文摘<正> In NW Jiangxi Province, China, a rock characterized by volcanic-subvolcanic texture and structure was found. It has the same rock-forming mineral composition as the greisen, is rich in rare elements, but different in chemical ingredients from any known unreplaced magmatic rocks, including ongonite. By K-Ar dating its age is 118×10~6 yr. Evidently the rock might be regarded as a new igneous rock.
