吉林大黑山条垒南段构造特征及隆升时代

Structural feature and uplift age of the southern part of Daheishan horst in Jilin,China

大黑山条垒南段,靠近佳-伊断裂西侧发育有一构造变形带,构造带内西部远离佳-伊断裂的岩石表现为韧性变形,东部靠近佳-伊断裂的岩石表现为脆性变形,岩石的变形特征自西向东呈现出由韧性到脆性渐变的规律,这主要是由大黑山条垒的差异隆升造成的。本文认为大黑山条垒的隆升始于早白垩世泉头组地层沉积之后,自晚白垩世之后一直处于隆升状态,遭受剥蚀,缺失晚白垩世以来的地层沉积。

A structural zone was developed in the southern part of the Daheishan horst close to the Jia-Yi fault zone. Within the structure zone a ductile shear zone occurs relatively away from Jia-Yi fault zone to the west, and a brittle deformation zone occurs close to Jia-Yi fault zone to the east. The deformations of the rocks from west to east are changed gradually from ductile to brittle, which was resulted in an uneven uplift of Daheishan horst in the west and east. The Daheishan horst was uplifted after the sedimentation of Quantou Formation in the Early Gretaceous, in a state of uplift after Late Cretaceous, the sediments are absent, indicating the horst has been continually up lifted and suffered erosion.