temporal trend meaning in Chinese

时间趋势

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
摘要通过对比华北太行山重力梯度带两侧新生代玄武岩及其中幔源包体的成分，发现： ( l )华北东、西部新生代玄武岩具有相反的演化趋势，说明新生代以来西部岩石圈逐渐减薄，而东部岩石圈逐渐加厚； ( 2 )西部岩石圈地幔组成相对复杂，年龄多为晚太古代元古代；而东部岩石圈地幔组成相对单一，年龄多为现代值，少数为元古代； ( 3 )西部壳幔过渡带较厚而东部较薄，反映两地不同的岩浆底侵作用程度。