Rhyolitic Nodule on Donggeochado Island, Jindo

Basic information

Designation

Natural Monument No.505

Category

자연지형

Era

중생대

Designated year

2009

Location

진도군, 전라남도— 전라남도 진도군 조도면 동거차도리 산 1-4 등

Coordinates

34.243357, 125.953346

The rock formation in Donggeochado Island appears to be an orbicular peperite, formed by the mixing of silicic or acid magma, rising to the earth’s crust, through a network of dykes, with volcanic ash. Peperites occur when there is sedimentation, concurrently with igneous activity (more particularly, magma intrusion or lava extrusion), and are very helpful for the interpretation and timing of geological processes that took place in the past. This orbicular peperite at Donggeochado Island of Jindo-gun is formed by a silicic dyke, in the shape of a nodule, getting detached from the rest of the rock mass. It can, therefore, offer important clues for the interpretation of the formation of silicic peperites.

Location