Serpentinite of Hiep Đuc complex has been determined and described in project of geological mapping in 1/ 500,000 scale and arranged in hyperbazite formation with MgO/ FeO > 6 (Huynh Trung et all, 1980). They are lens, sheet in shape, with small crops. They injected along tectonic line (rift) with longitudinal direction or subparallel direction. They do not cause thermal - exomorphism for surrounding rocks and named as non root – protrusion. Petrography composition are mainly olivinite, lherzolite (chemical composition) rich in MgO (32–37%). The serpentinite bodies distributed mainly in rift zone. This zone displays spilite and ultramafic, mafic formations of Ngoc Hoi complex of early Paleozoic age. Serpentinite formations of Hiep Duc complex are not common magmatic origin of spilite, pyroxenite, gabbro formations which mentioned. Association of these formations formed Kontum ophiolite assemblage of early Paleozoic age, which can be compared with ophiolite assemblage of Alpine-type.Petro-geochemical characteristic of serpentinite are like composition of upper mantle, alpinotype hyperbazite and oceanic floor. During early Paleozoic, they were compressed and protruded from deep crush. Kontum massif was formed in late Proterozoic, and separated into microplates by tectonic line in which the serpentinite bodies of Hiep Duc complex protruded.

The diabasic dykes exposed at the Trai Mat quarry, Da Lat city intrude the granitoids of Ankroet complex (such as middle – coarse grained biotite granite and leucogranites. As can be seen in the field the thickess of these dykes vary from 0.5m to nearly 1.5 m extended north-south-east slope angles ranging from ~50 0 to being upright (Orientation of lying 31<50 ÷ 90 o). Petographical components consist of diabaz porphyrite. The main mineral components are plagioclase, pyroxene?, quartz, carbonate, chloride. Chemical components of rocks are: SiO2: 54.34 %, K2O: 2.43 %,Na2O: 2,50 %. The content of W, Pb, U, Th, Hf, Rb, Au is higher

The granitoid formations of Hai Van massif with petrographical components consist of biotite granite, two mica granite. Chemical components of rocks are: SiO2: 69,34=73,92%, Na2O+KO: 6,11-8,11%, K2O/Na20>1. Content of Ba, Sr is low but Rb is higher. From results of Nd-Sm isotopic analysic shows that they are nearly same with stable crust material. Age of source region formation is 1,33 billion years (model of homogeneous chondrite source region), or 1,95 billion years (model of poor mantle source region). U-Pb isotopic age: 241,9+ 2 and 241,4+2.1 million years.

Ba Na granitoid is isometric shape, with exposure of 30 sqa km area. Petrographic composition is mainly coarse - medium grained biotite granite, included in the first phase. The fine grained leuco rock of the second phase is small massif in shape, distributed along fault in NE-SW direction. SiO, content of Bana granitoid is variation from 73.74% to 76.24%. Total of K2O +Na2O is from 7.32% to 8.33%. Ratio of K2O/Na2O: 1.66 - 2.07. This is S-Granite. Value of 147Sm/144Nd = 0,1249 is nearly stable crust material. Ratio of Sm/Nd is low. ena has negative value and very small proved that Ba Na granitoid must derive from crust source or mantle source which rich (EM). The age of source regional forming calculated from isotopic of Sm, Nd is 1.06 Ba (according to model of chondrite mantle source region) or 1.74 Ba (according to model of poor mantle source). The prospects of related mineralization of Ba Na granitoid is Sn (W, Nb, Ta) with amsemblage of topaz - cassiterite - tourmaline - quartz (sometime is Ta - Nb). The result of isotopic analysis of U Pb in zircon of Ba Na biotite granite sample at lab of Tasmania University, Australia, age of Ba Na is 242.9 +1.5 Ma and 240.6 2.2 Ma.