The Sen-nin hematite deposits have been generally considered to be of contact metasomatic type related to nearby Cretaceous granitic rocks. Another opinion is that the mineralization is connected with the acidic volcanism of the Middle Miocene. The hematite ores have reversed remanent magnetization. Of five igneous rock bodies in the area, ranging in age from Cretaceous to Neogene, only the Miocne plagiorhyolite body has similar direction and polarity. The other bodies are normal. It is concluded that the Sen-nin hematite deposits were genetically related to the plagiorhyolite. It is also suggested that the mineralization is middle Middle Miocene in age.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.