地质通报2016，Vol.35Issue(8)：1234-1242,9.
内蒙古月牙山一带基性火山岩的地质特征、形成时代及归属
A discussion on the geological characteristics, formation age and attribu- tion of basic volcanic rocks in Yueyashan area, Inner Mongolia
摘要
Abstract
A NWW-trending basic volcanic rock belt is exposed from east to west in the Yueyashan area. The basic volcanic rock belt is composed of layered basalt, pillow basalt and altered basalt. Previous views concerning the attribution of volcanic rocks are con⁃troversial. The volcanic rocks are distributed at the center of Yueyashan ophiolite tectonic melange belt and are spatially closely associ⁃ated with the ophiolite. Volcanic pillow structure is well developed in this set of volcanic rocks, showing the characteristics of subma⁃rine volcanic eruption. Petrochemical and geochemical studies show that this set of volcanic rock has typical normal mid-ocean ridge basalt (N-MORB) characteristics. Therefore, the Yueyashan basic volcanic rock belt should belong to the part of the Yueyashan ophiolite suite. The authors obtained isotopic age of about 530Ma for gabbro diorite which invaded this volcanic rock belt and also obtained isotopic ages of about 527Ma to 530Ma for gabbro and plagioclase granite. These age values are equivalent to the age of Ear⁃ly Cambrian, indicatiang that the age of the basic volcanic rocks is Early Cambrian.关键词
基性火山岩/蛇绿岩套/蛇绿质构造混杂岩/洋中脊玄武岩Key words
basic volcanic rock/ophiolite suite/ophiolite tectonic mélange/mid-ocean ridge basalt分类
天文与地球科学引用本文复制引用
胡醒民,廖云峰,程海峰,杨济远,胡新悦..内蒙古月牙山一带基性火山岩的地质特征、形成时代及归属[J].地质通报,2016,35(8):1234-1242,9.基金项目
中国地质调查局项目 （）
