龙岗复合陆块深部构造浅析

A preliminary interpretation on the deep-seated structure of the Longgang compound landmass

靖宇—和龙最新航磁ΔT⊥向上延拓5km等值线图和布格重力ΔgB资料,所反映深部地球物理场特征,具有良好的一致性。该区以金银别—露水河—天池存在的北北西向深部重磁变异带为界,可划分出两种不同的地球物理场区,表明该区龙岗复合陆块确实是由白山镇微地块与和龙微地块拼贴的产物。对地质—地球物理块体的进一步划分,还为认识古元古宙裂陷槽的展布及其后期地质事件带来一些具有启迪意义的重要信息。

The deep geon characteristics by the latest aeromagnetic △T⊥ In the Jing yu-Helong area upward continuation 5km isogram and the Bouguer gravitation△g B show a good compatibility. Taking the NNW deep gravity and magnetic mutati on zone as a boundary line in the Jinyinbie-Lushuihe-Tianchi, it can be divided into two different geons, showing that Longgang compound landmass is a matching product by the Baishanzhen microlandmass and Helong microlandmass. For the furth er divide to the geology-geophysical landmass, we can know that the exhibition o f the Paleoproterozoic chasmic trough and its associated geologic events can pro vide some heuristic, useful information.