COMPREHENSIVE RESEARCH OF STRUCTURE ANALYSIS,REMOTE SENSING,METHODS OF GEOPHYSICAI AND GEOCHEMICAI PROSPECTING ON ORE-CONTROLLING STRUCTURES AND PROGNOSIS OF CONCEALED DEPOSITS IN THE TENGCHONG—LIANGHE TIN METALLOGENIC REGION
Xu Chengyan Wang Hao Liu Yuexiang Meng Xianguo (Chinese University of Geoscience,Wuhan)
The basement of Tengchong—Lianghe tin metallogenic region is Protero-zoic-Palaeozoic, and the cover is the Menghong Group of Upper Palaeozoic. During Mesozoic-Cenozoic periods, this region, to be an obduction wall in the Mizhina-Mandele and Najiashan—Alagan subduction zones, was activated strongly in faulting with intruded magma repeatedly so as to be favourable to mineralization. Siliceous mylonite and migmatite occurred in the Menghong Group and felsic mylonite occurred in the granite represent different environ-ment of temperature—pressure and different levels of deformational condi-tions. The ore deposits occur in brittle environment at shallower part. Accor-ding to the data analysis of metallogenic temperature, inclusion composition and saltiness, the three ore sections at higher elevation in the Lalieshan ore field, the Taojinchu, Sangedong and Laoxiongwo sections, are not the same evolutionary series as the Siguangping section at lower elevotion. Ore source material of the Siguangping ore section originated from another rock mass with its ore bodies occur in echelon patterns. Therefore, there is of metallogenic possibility at depth and in the adjacent areas. The Xiaolonghe tin deposit is closely related to the granite. The Guyong composite batholith was intruded re-peatedly. The differentiation index of tin is very high. These show that there is a good condition of metallogenic sources. Under later tectonic action and thermal motion, mineralizing solution was precipitated into deposit when phy-sical and chemical fields changed suddenly in its transporting process. This paper covers the 132/43, 132/42, MSS-and TM-tape data. The results of managing the data of geophysical and geochemical prospecting, geology and remote sensing by computer-multiple data and synthetic image are app-lied to metallogenic prognosis.