论文部分内容阅读
由早期绿岩、变质ＴＴＧ杂岩及闪长岩为主构成的辽南古陆壳，在新太古宙末期—古元古代初期遭受了四期构造变形，以主期变形（第三期）最为显著。该期变形重塑了古陆壳上的太古宙岩石，形成密集而普遍的区域透入性主期片麻理（Ｓ３），矿物线理（Ｌ３）及“顺片”掩卧褶皱（ｆ３），并伴随高温低压条件下的角闪岩相区域变质作用，变形机制属中构造环境下由南至北的韧性水平剪切滑脱，其动力学成因可能为诱发古元古代辽东裂谷的地幔软流圈热羽的早期活动，导致辽南古陆块上部硅铝壳相对于壳下岩石圈作反向滑脱的壳下拆离作用。
The paleocontinental Liaonan crust, mainly composed of early greenstone, metamorphic TTG complex and diorite, suffered four tectonic deformations in the late Neophorozoic-Early Proterozoic, with the main deformation Significant. During this period, the Archean rocks on the paleo-continental crust were remolded to form a dense and widespread regional intrusive main episode (S3), mineral lineage (L3) and “cis” fold (f3) Accompanied by the metamorphism of amphibolite facies under high temperature and low pressure. The deformation mechanism is shear-to-slippage at the ductile level from south to north under mid-tectonic setting. The dynamical genesis may be due to the mantle flow induced by the Liaodong rift in the Paleoproterozoic The early activities of the ring thermal plume led to the detachment of the upper Si-Al shell relative to the lithosphere beneath the shell in the reverse slip-off of the shell.