摘要
新的区调成果证实上世纪70年代在辽东建立的古元古代辽河群层序以及辽河群存在南北方向相变的认识是正确的。辽河群已全线过鸭绿江分布在狼林地块各处。狼林群的大部分相当于辽河群。辽河群原始沉积盆地主体呈东西向狭带状,它以太古宙陆壳为基底发育双峰式火山岩,构造属性为大陆裂谷,个别中心部分曾发生块体的有限分离而出现洋壳。笔者还对古盆地南、北太古宙陆块间地质差异的原因作了讨论。
The results of new regional survey has validated the sequence of the Paleo proterozoic Liaohe Group es-tablished in eastern Liaoning in the1970s and the existence of the N-S facie s change in the Liaohe Group.The Liaohe Group has all crossed the Yalu River and is distributed over various parts of the Langlin massif.Most of the Langlin Gro up is equivalent to the Liaohe Group.The main part of the original sedimentary b asin of the Liaohe Group occurs as an E-W-trending narrow stripe.It takes the Ar chean continental crust as the base;in the basin bimodal volcanic rocks are deve loped.The tectonic attribute is the continental rift.In a few individual cen-tral parts,there appears oceanic crust separated from the massif.The paper a lso discusses the cause for the differ-ence in geology between the northern and southern Archean continental blocks of the ancient basin.
出处
《中国地质》
CAS
CSCD
2003年第2期207-213,共7页
Geology in China
