SUMARRY

Researching, establishing and classifying Geoheritage

in the Tam Giang - Bạch Mã region, Thừa Thiên - Huế province

Vũ Quang Lân, Trần Quang Phương, Bùi Tiến Dũng, Nguyễn Xuân Quang

Tam Giang - Bạch Mã region is located in Thừa Thiên - Huế province and covers an area of ca. 1600 km². This region is considered as a place storage many outstanding values of history of geological evolution and geological structure; geomorphology, landscape; Quaternary geology - marine geology and mineral resources. The continental crust in this region has undergone a long history of evolution, from Ordovician to Holocene, and in many different tectonic settings. During the Ordovician - Silurian time, the region is a part of the "Long Đại volcano" Island arc; following is the development of red terrigenous and carbonate formations in the Early Devonian-Carboniferous time; The Indosinian orogeny took place during Late Permian-Trassics to formed magmatic rocks include the rocks of Phú Lộc, Hải Vân and Bà Nà complexes. The Phú Lộc magmatic rocks are mafic in composition, whereas, Hải Vân and Bà Nà rocks are biotite-bearing granites and two mica granites, which were generated in tectonic setting relating to plate collision between Indochina and South China Blocks. In the mountain and hill area, the topography is characterized by the erosion surfaces, waterfalls and natural lakes; In the coastal plain are lagoons, sand dikes, river sections with emerging dunes and beautiful beaches. The outstanding geoheritage values in the Tam Giang - Bạch Mã region have great significances for scientific research; educations; tourism and economic development.

Keywords: Red River Shear Zone, Tân Hương granite, zircon U-Pb isotope.