Abstract

• Many famous beaches are located at Dawei in Tanintharyi Region. Among them Pa Nyit Beach is situated in the westernmost part of Launglon Township. It is lying between Latitude 14°59′00″N to 15°02′30″N and Longitude 98°083′30″E to 98°05′30″E. It extends about 3.34 km from east to west and 5.85 km from north to south. The area covers about 19.52 square kilometers. In this area, the mountain ranges show the North-South trending. Regionally, three granite belts in the Dawei area are frontier range granite, central range granite and coastal range granite. The study area is located in the coastal range granite. Granitic rocks in the study area are hornblende biotite granodiorite, biotite granite, porphyritic biotite granite, microgranite and leucogranite. Aplite dykes and quartz and quartzofelspathic veins intruding into these rock units, especially biotite granite and microgranite. Both major and various minor landforms of granite are observed in the study area. Minor landforms are classified as weathering forms, tectonic forms and Structural forms. Observable weathering forms in the study area are blocks, boulders, exfoliation, pitting, sheet, flakes and spalls, polygonal cracks, gutter and grooves, pseudobedding and tafoni. Many of them are initiated in the surface. A-tent and orthogonal cracks are tectonic forms and they are formed by different ways of tectonic movements. Structural forms in this area are cleft, displaced blocks and split rocks, fault, joint, fracture and intrusive dykes and veins. Most of them are formed due to intrusive veins.