| 词条 | Valkyrie pipe |
| 释义 |
The Valkyrie pipe is a diatreme in northern Alberta, Canada. It is associated with a group of diatremes called the Birch Mountains kimberlite field which is thought to have formed about 75 million years ago when this part of Alberta was volcanically active during the Late Cretaceous period.[1][2] See also{{Portal|Volcanism of Canada}}
References1. ^Petrogenetic considerations for the Late Cretaceous northern Alberta kimberlite province {{coord missing|Alberta}}{{Alberta-geo-stub}}{{Canada-geology-stub}}2. ^Alberta Geological Survey: Kimberlites, Indicator Minerals and Diamonds 1 : Birch Mountains kimberlite field |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。