World Class Geoheritage

THE TOR MORPHOLOGY TANJUNG PANDAN GRANITE AT SEA ENVIRONMENT

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THE TOR MORPHOLOGY TANJUNG PANDAN GRANITE AT SEA ENVIRONMENT

The Tanjung Pandan Granite Unit is the end of Southeast Asian granite belts that extends from the north, Burma continuous along the Peninsular Malaka and the southern part ends in the northern western part of Beitong Island. This granite rock is an absolute age of 218 (+/- 5) million years based on the results of Analysis on Biotite / Hornblende using K-Ar & R-Sb (Priem et al, 1977). This rock has a world heritage in the form of TOR morphology that occurred in the coastal environment. This TOR process was a weathering process result that occurred due to the influence of vertical and horizontal joints. Vertical joints are caused by a weak zone in the form of contact at the end of freezing granite which is then washed and formed a vertical joint. However, this vertical joint was also caused by the influence of the shifting structure of the sundaland plate along with the movement of the island of Sumatra. This distinguishes vertical joints forming process from granite in Cornwall, United Kingdom. Then horizontal joint was caused by the effect of dilatation & pressure tensions. Both of these joints formed cubic shape. This process is called freeze thaw. Then, the cubic shape was isolated and underwent a hydrolysis process making it rounded and smooth. The results of the process formed an exotic arrangement of coastal granite rock such as eagle. This world-class geological heritage can be found in the Tanjung Kelayang Geosite.