松辽盆地形成与演化的深部作用过程——中生代火山岩探针  

THE DEEP PROCESS OF FORMATION AND EVOLOTION OF SONGLIAO BASIN Mesozoic volcanic rock probe

作　　者：王清海[1] 许文良[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130026

出　　处：《吉林大学学报（地球科学版）》2003年第1期37-42,共6页Journal of Jilin University：Earth Science Edition

基　　金：中国石化公司"十五"重点攻关项目(P00002028);高校博士学科点基金项目(20010183007)

摘　　要：松辽盆地中生代火山作用从一个侧面揭示了松辽盆地形成与演化历史。松辽盆地中生代火山岩的岩石地球化学研究表明,中生代火山作用的深部过程表现为岩浆源区从逐渐上升到下降的过程。晚侏罗世到早白垩世早期为降温降压过程,表现为等温面逐渐升高,岩石圈伸展速度增大,岩浆源区变浅,盆地演化由断陷向坳陷转化。从早白垩世早期到晚白垩世,则为升温升压过程,等温面下降,岩石圈伸展速度变小,岩浆源区加深,盆地演化进入坳陷期。The Mesozoic volcanism in Songliao basin revealed one aspect of the history of formation and evolution of Songliao basin. The petrological and geochemical data of Mesozoic volcanic rocks in Songliao basin indicate that the deep process of Mesozoic volcanisms is a counterclockwise PTt locus, which corresponds with the upward to downward drifts of magma sources. From late Jurassic to the early stage of early Cretaceous, the deep process of volcanisms is a falling pressure-temperature process, which corresponds with the graduall uplift of isothermal plane, the increase of lithospheric extension rate, the upward drift of magma sources, and the transformation of fault depression to depression in basin evolution. From the early stage of early Cretaceous to the late of early Cretaceous, the volcanism deep process is a increasing pressure-temperature process, which corresponds with the decrease of isothermal plane and lithospheric extension rate, the downward drift of magma sources and the depression stage of the basin evolution.

关 键 词：中生代 火山岩 松辽盆地 深部作用 火山作用 岩浆 

分 类 号：P544.4[天文地球—构造地质学] P534.5[天文地球—地质学]