The comparison of cenozoic basalts and their mantle xenoliths from both sides of the taihangshan gravity lineament reveals that : ( 1 ) cenozoic basalts from western and eastern north china display opposite temporal trends , suggesting lithospheric thinning in western north china during the cenozoic and lithospheric thickening in eastern north china ; ( 2 ) the lithospheric mantle in the west is mostly late - archean to proterozoic in age , whereas that in the east has a modern age with minor proterozoic age ; ( 3 ) the crust mantle transition in the west is considerably thicker than in the east , probably due to different extents of magmatic underplating 摘要通過對比華北太行山重力梯度帶兩側新生代玄武巖及其中幔源包體的成分,發(fā)現(xiàn): ( l )華北東、西部新生代玄武巖具有相反的演化趨勢,說明新生代以來西部巖石圈逐漸減薄,而東部巖石圈逐漸加厚; ( 2 )西部巖石圈地幔組成相對復雜,年齡多為晚太古代元古代;而東部巖石圈地幔組成相對單一,年齡多為現(xiàn)代值,少數(shù)為元古代; ( 3 )西部殼幔過渡帶較厚而東部較薄,反映兩地不同的巖漿底侵作用程度。