|Table of Contents|

Forming Mechanism of Indosinian Trough-Like Folds in Yanling Region，Hunan(PDF)

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

Issue:
2006年第04期
Page:
10-14
Research Field:
Publishing date:

Info

Title:
Forming Mechanism of Indosinian Trough-Like Folds in Yanling Region，Hunan
Author(s):
BAI Dao-yuan1; CHEN Jian-cheng2; MENG De-bao1; WANG Xian-hui1 MA Tie-qiu1; ZHANG Xiao-yang1; CHEN Bi-he1
1. Hunan Province Institute of Geology Survey, Xiangtan 411100, Hunan, China; 2. 413 Brigade of Hunan Province Bureau of Geology and Mineral Exploration and Development, Changde 415000, Hunan, China
Keywords:
trough-like folds;  thick-skin;  Indosinian;  Yanling;  Hunan
PACS:
P542
DOI:
-
Abstract:
This paper carried out regional geological survey in Yanling area in order to study the characteristics and form- ing mechanism of the Indosinian folds in southeast Hunan. The survey declared that the uncomformity surface between Devonian Tiaomajian Formation and Predevonian basement make up anticlines and synclines, which indicate that the fol- ded basement participated in Indosinian folding. On surface, the synclines have less width and less extending size than the anticlines; the hinge ends of synclines are clear, narrow and sharp, while the hinge ends of anticlines aren’t distinct. At section plane, the uncomformity surface is steep near the syncline core, and become gentle toward two limbs. Above features show pattern of trough like folds with gentle and wide anticlines as well and narrow close clinoriums. The NNE- directed Indosinian folds stride across the Caledonian NW-directed folds in the predevonian basement, and didn’ t trans- form the Caledonian folds evidently. Outcrops show that the cover did not detach along the uncomformity surface. The trough like folds in Yanling region were formed during the transverse shrinking and flattening of the basement(thick- skin), the trough like folds were not the production of cover detachment along basement, so the former standpoint of thin skin about it was corrected.

References:

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Last Update: 2006-12-20