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Study on Jurassic Superposed Deformation in Yudu Area Located in the Middle of Dabashan Tectonic Belt(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2010年第02期
Page:
130-
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Study on Jurassic Superposed Deformation in Yudu Area Located in the Middle of Dabashan Tectonic Belt
Author(s):
WU Guo-li;  CHEN Hong;  TIAN Mi;  SHI Wei;  GAO Wei
(Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China)
Keywords:
foreland tectonic belt;  superposed deformation;  box fold;  Dabashan;  Qinling
PACS:
P548
DOI:
-
Abstract:
Dabashan tectonic belt characterized by thrust nappe structure is developed in the southern of Qinling orogenic belt. Through detailed structural analysis in Yudu area located in the middle of Dabashan tectonic belt, the results show that Dabashan tectonic belt has undergone at least two superposed deformation since Jurassic. The deformed strata are Triassic Jialingjiang Formation to Jurassic Shaximiao Formation. Early deformation is predominantly NW-NNW axes trending box fold or partition wall style fold and decollement structure developed at deep. The time of early deformation is late Jurassic to early Cretaceous. The late deformation relates to thrust movement of its north side and results in dextral strike slipping deformation which composed of dextral strike slipping fault and NW-NNW trending tight folds. The time of late deformation is between late Jurassic and early Cretaceous. Folds formed by two stages deformation have similar extend direction and are consistent with the direction of regional tectonic line. Away from the northern Zhenba fault, the deformation intensity has a weaken tendency. The two stage deformations form coaxial or oblique superimposed structure. Study shows that the deformation relates to the southward thrusting of Dabashan thrust nappe belt.

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Last Update: 2010-06-20