http://www.sciencedirect.com/science/article/pii/S1674987111001022 |
| |
Authors: | Guiting Hou |
| |
Institution: | The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
| |
Abstract: | This study proposes three models to explain the mechanism of the three major types of mafic
dyke swarms. Parallel dyke swarms form in response to a regional stress field, e.g. the mafic dyke swarms
in the North China Craton, whereas small radiating dyke swarm forms due to stress constructions around
a plutonic or volcanic edifice, such as the dyke swarm at Spanish Peak, USA. The third type of radiating
dyke swarm is giant fan-shaped dyke swarm such as the Mackenzie dyke swarm. Fractures that formed
prior to magmatism may play a vital role in dictating the dyke swarm geometry. In most of the cases, the
pre-existing fractures are induced by tectonic stresses and not by magma injection though magma injection
can increase the fracture size by propagation at the dyke tip. |
| |
Keywords: | Parallel dyke swarm Radiating dyke swarm Hole model Plug model |
本文献已被 CNKI 维普 万方数据 ScienceDirect 等数据库收录! |
| 点击此处可从《地学前缘(英文版)》浏览原始摘要信息 |
| 点击此处可从《地学前缘(英文版)》下载免费的PDF全文 |