罗兰马群
又译罗赖马群。时代属中元古代。主要分布在圭亚那地盾上，为一套具明显交错层理的红色石英砂岩，夹长石砂岩、页岩和砾岩，有时夹少量铁质碧玉凝灰岩，底部有熔结凝灰岩。与下伏古元古代基底呈不整合接触。凝灰岩RbSr年龄为17.5亿～16.5亿年，侵入的闪长岩年龄为16.9亿年。
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contributed at 2011-10-11
Classification(s)
●
Earth System(in Chinese) Geostratigraphic stratigraphy
Detailed Description
| English |
|---|
| Name | Roraima Gr |
| Chinese |
|---|
| Name | 罗兰马群 |
| Description | 又译罗赖马群。时代属中元古代。主要分布在圭亚那地盾上，为一套具明显交错层理的红色石英砂岩，夹长石砂岩、页岩和砾岩，有时夹少量铁质碧玉凝灰岩，底部有熔结凝灰岩。与下伏古元古代基底呈不整合接触。凝灰岩RbSr年龄为17.5亿～16.5亿年，侵入的闪长岩年龄为16.9亿年。 |
How to Cite
NNU_Group (2011). 罗兰马群, Concept & Semantic, OpenGMS,
https://geomodeling.njnu.edu.cn/repository/concept/74e7e83f-c4ef-413f-a88e-2f13d5a3c686
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