http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/55 2026-05-22T16:18:59Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/1523 Title: Building a GIS database for ecotourism development in Ba Vi District, Ha Tay Province, Vietnam Authors: Nguyen, Dinh Minh Abstract: Ecotourism is a concept and a fast growing segment of the tourism industry worldwide. It plays an increasingly important role in the socio‐economic development of many districts and provinces in Vietnam. Therefore, it needs to be well planned and managed with the aid of spatial information technologies such as Remote Sensing (RS), Geographic Information System (GIS) and Global Positioning System (GPS). This paper presents the results of building a GIS database for ecotourism development in Ba Vi, a large legendary mountainous district of Ha Tay Province based on field and desk investigations. The created database consists of spatial and attributive data files related to natural and cultural resources in Ba Vi stored in a standard format of ArcView GIS that can and should be effectively retrieved, analyzed and updated to generate useful information in the form of maps, tables and charts to support ecotourism planning and management activities in the district for sustainable development. Description: VNU Journal of Science, Earth Sciences. Vol. 23 (2007), No. 3, P. 146‐151 2007-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/1513 Title: On some significant unconformities in the Paleozoic and Mesozoic stratigraphy of North Viet Nam Mesozoic stratigraphy of North Viet Nam Authors: Tong, Dzuy Thanh Abstract: A lot of unconformities and stratigraphic gaps have been discovered in the Paleozoic and Mesozoic stratigraphy of Bac Bo region (North Viet Nam), but their role in the regional geology was not accessed yet in detail. This paper is the first attempt to describe the most significant unconformities and stratigraphic gaps and discussing their role in regional geology. The most important is the angular unconformity of Norian‐Rhaetian formations upon various formations of different formations; it marked the change tectonic regime of the region resulting from the indosian orogeny in Viet Nam and in Southeast Asia in common. The gap of Lower Devonian red beds formations (Si Ka Formation, Song Cau Group) upon Lower Paleozoic formations (Upper Cambrian ‐ Than Sa Formation, Lower Ordovician ‐ Lutxia and Na Mo formations) is a regional unconformity, which had been taken place in the epicaledonian terranne of South China and North East of Viet Nam. The gap between the Da Mai Formation and the Dong Dang Formation was a result of a crust rising, but was not through the orogeny activity, although after this gap the structural plan was more differentiated. Other unconformities and stratigraphic gaps seems to be local unconformities, for instance, the one of the Tan Lap Formation (D2g‐D3 fr tl) upon the Ban Pap Formation (D1p‐D3 fr bp) and the unconformity between the Sinh Vinh (O3‐S sv) and the Ben Khe (ε‐O1 bk) formations. Description: VNU Journal of Science, Earth Sciences. Vol. 23 (2007), No. 3, P. 137‐146 2007-01-01T00:00:00Z