| Bajianfang area located in the northeast of the Inner Mongolia Autonomous Region Derbugan metallogenic belt, Bajianfang-Jageda village of gold and polymetallic metallogenic sub belt, the geological structure is complex, and the mineralization area more favorable. Stratum, intrusive rocks, volcano rocks are well-developed, metamorphic rocks are not developed. Influenced by the Derbugan deep fracture, fault structure is developed in this area, formed a reticular fracture pattern that mainly in the northeast-trending,then in the northwest-trending.1. Regional stratigraphic surveyThe study area is strata from the Paleoproterozoic Xinghuadukou group(Pt1X.), Neoproterozoic Nanhua Jiageda group(Nhj), Mesozoic Jurassic Tamulan formation(J2t), Jurassic manketouebo group(J3m), manitu(J3mn), lower Cretaceous baiyingaolao group(K1b). The major Cenozoic is Quaternary Holocene(Qh).2. Regional intrusive rocksThe intrusive rocks in this area are very developed. Exposed area of about 1208km2, accounting for about 66% of the total area of the survey area. Divided into Paleoproterozoic, Neoproterozoic, Middle Permian, late Jurassic and early Cretaceous.5 tectonic magmatic intrusive events, a total of 10 mapping units.Proterozoic intrusive rocks are mainly a set of metamorphic plutonic rocks-Fengshuishan gneiss complex, the main rock types of banded biotite plagioclase gneiss and granite dioritic gneiss; Neoproterozoic magmatic has been divided into 3 mapping units, belong to 2 tectonic magmatic activity stage in the early stage of basic intrusive rocks, a rock like strain output, with gneissic structure, composed of mafic rocks; in the stage of intermediate acid intrusive rocks in large scale, a batholith or rock strains in grain output, by porphyritic biotite moyites, containing two plaques in the biotite monzogranite in Triassic intrusive; two rock by fine medium grained biotite granite(P2??1) and two in biotite granite(P2??2). The Mesozoic intrusive rocks from Late Jurassic granite porphyry(J3??), late Jurassic quartz diorite(J3??), the late Jurassic biotite granite fine in two(J3??) and early Cretaceous fine-grained granodiorite(K1??).3. Regional volcanic rockVolcanic activity in the region is frequently. Mainly Mesozoic continental volcano rock, rock stratigraphic units by volcano rocks or containing volcano rock are mainly Mesozoic Jurassic Tamulangou formation, late Jurassic manketouebo, manitu formation and early Cretaceous baiyingaolao.4. Regional structure researchThe overall structural framework of this area was established, and the morphology, scale, occurrence, nature, formation of the main structure and the relationship between the formation and mineralization of the main structures were found out. The regional tectonic framework is established, and the relationship between tectonic cycle and sedimentary function, magmatic activity, metamorphism and mineralization in the area is preliminarily discussed. It provides basis for metallogenic prognosis.5.The main resultsThe distribution and enrichment characteristics of the main elements in the area were identified, and the main ore-forming elements of Au, Pb, Ag and Zn were determined.Comprehensive delineation of abnormal 32, of which nine are B2, seventeen are B3, five are C, one is D.The newly discovered ore(chemical) point 6, submitted to the further work of the prospecting target area of 7, of which 4 have been the autonomous region of mineral exploration projects. It has guiding significance for the next step of prospecting work. |
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