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Official thesis title: "Middle-Upper Paleozoic stratigraphy at Ha Lang area in relation to structural geology and mangan minerals"
1. Full name: Nguyen Cong Thuan
2. Sex: male
3. Date of birth: 28/01/1980
4. Place of birth: Hung Yen.
5. Admission decision number: 3614/QĐ-SĐH November 22nd 2009 by President of Vietnam National University, Hanoi.
6. Changes in academic process: None
7. Official thesis title: "Middle-Upper Paleozoic stratigraphy at Ha Lang area in relation to structural geology and mangan minerals"
8. Major: Paleontology and Stratigraphy
9. Code: 62.44.55.10.
10. Supervisors: Assoc.Prof. Dr. Ta Hoa Phuong; Assoc.Prof. Dr. Nguyen Van Vuong
11. Summary of new findings of the thesis:
The study area, Ha Lang, contains a very complex structural geology and has a great potential on mangan minerals. Base on analysis of structural elements, oders of Paleozoic stratigraphy and stratigraphic units containing mangan minerals were clarified. In this thesis, environmental conditions of Devonian formations were also generally established. New findings of the thesis are presented as followed:
1. Constructed scientific base for estabishing a new formation: the Na Dang formation.
2. Proved sediement of the Ban Cong formation was formed in Givetian and this formation locates in between the Na Quan formation and Na Dang formation.
3. Proved the lowest part of the Toc Tat formation was formed in Frasnian.
4. Established 3 paleogeographic-facies sketch maps coresponding to 3 depositting periods in Devonian.
5. Mangan minerals were formed in 3 periods: Frasnian, Famennian and Tournaisian.
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