| Aeromagnetic survey due to some of its own technical limitations, such as general measurement accuracy is not high, and the measurement of small scale, it will be affected by the magnetic field of the inclined magnetization effect lead to abnormal center and not actual, the aeromagnetic anomalies delineated scale and scope are very big, and it is difficult to directly by the magnetic.prospecting. So aeromagnetic anomalies of the ground for further verification is necessary and important. Through ground verification can verify the detailed understanding of abnormal geologic condition, survey abnormal source, further narrow the scope of the ground of ore, mineralization anomalies delineated and guide the prospecting direction. In view of the current ground check method usually a single method, combination of several methods to verify the verification opposite less, the high precision measurement, nuclear magnetic geophysical technology and gamma ray spectroscopy field X-ray fluorescence analysis technology under combined application of magnetic anomaly of the study is to verify the ground more less in China, Relying on the project "high-precision aerogeophysical survey? of China Aero Geophysical Survey & Remote Sensing Center for Land and Resources (AGRS)corpus "West Tian shan magnetic anomaly verification field X-ray fluorescence application demonstration", in the backcountry gamma energy spectrum, X-ray fluorescence analysis technology and magnetic measurement precision ground three methods under combined application of magnetic anomaly to verify the ground. The application work area in the same observation network standards on the dot field X-ray fluorescence area measurement, gamma energy spectrum area measurement and ground high precision profile measurement. Field X-ray fluorescence analyzer analysis is in situ soil and rock (mineral) the ore-forming elements and associated elements. The content of gamma energy spectrum measurement analysis is in situ soil and rock of radioactive elements (U, Th, K) content. High accuracy measuring point magnetic determine the earth's magnetic field intensity. Through the three methods of measuring data can get work area rock or minerals in different attributes, the use of mathematical statistics method to analyze the work area within different lithology of elements (ore-forming elements and radioactive elements), uniform distribution of different lithology of average earth's magnetic field, analyzes the differences of the intensity of lithology and the earth's magnetic field intensity, according to the correlation of the earth's magnetic field strength distinguish the lithology. Draw the elements (Cu, Pb, Zn, As, U, Th, K) composite anomaly maps, according to certain abnormal lower limit, the statistics all sorts of elements of the abnormal shape, size, intensity and many combinations of elements, the abnormal situation after all kinds of anomalies corresponding statistics lithology. Based on geological, according to the distribution of elements with the statistical rule of lithology, abnormal and lithology, analyzes and explains the relationship between the abnormal formation law, summarizes the work of radioactive elements in different lithology abnormal the distribution law of Pb, Zn, As combination abnormal (Zn-1, As-1, Pb-1) to explain, Cu, Ni combination of abnormal analysis, analysis of the advantages of copper mineralization vision area. Paint the ground magnetic measurement precision of the earth's magnetic field strength, and the corresponding sections profile of the Fe, Ti section comparing, explains the earth's magnetic field intensity and rock Fe, main Ti elements, the comprehensive interpretation of the magnetic anomaly. Using field X-ray fluorescence analysis technology, the gamma energy spectrum technology and high precision ground combined application of magnetic measurement in West Tian Shan area with the abnormal ground verification, have the following results: (1) More than 8000 square meters, delineating the Pb, Zn, As combination myopia oval abnormal Zn-1, As-1, Pb-1. Zn, that the whole Pb combination As the center of the abnormal is not in the known lead-zinc mine porphyry granite, but in the north of the known lead-zinc mine silicon limestone, in the northern part of the body of known deposits silicon limestone is more rich deposits of.(2) By Cu, Ni strip of article combination is analyzed, in that known lead-zinc mine near body found less likely copper mine. Cu and Pb, smaller Zn did not associated, but happened on the known thing lead-zinc deposit separation on both sides of the andesite, is advantageous copper vision zone, tagged copper anomalies in the opposite andesites or silicon limestone and andesites contact place, or diagonal long porphyry granite and andesites contact area.(3) Through the radioactive element anomalies of different lithology and statistical distribution of radioactive elements of the statistics. Statistical law from the view, this paper analyzes the causes of the radioactive anomalies, through the lithology of radioactive elements and variation coefficient of the average content that the lithology of the possibility of abnormal size is feasible.(4) To the ground by high precision measurement of the earth's magnetic measurement total magnetic field intensity in different lithology of analyzing the content of the average, lithology according to the earth's magnetic field strength from large to small sort for silicon limestone-the length of porphyry granite-the fourth alluvial flash flood and granite long porphyry-andesites are adjacent lithology, 10 to 20 nT, so it can be based on the total magnetic field intensity to distinguish the lithology.(5) Profile 3, profile 5 and profile 9 on the ground magnetic measurement precision and get the earth's magnetic field strength and total X fluorescence analyzer measurement Fe, Ti element profile for contrast and analysis, theΔT and Fe, Ti in the abnormal section, magnetic anomaly change that synchronous mainly by Fe, Ti element content, and the abnormal cause analysis of magnetic anomaly interpretation, presumably, Fe-3 in the length porphyry granite and andesites boundary is advantageous in copper iron ore prospect areas. Through the field X-ray fluorescence survey, ground gamma energy spectrum measurement and ground high precision measuring three methods of magnetic combination in Tian Shan area with the application shows that three methods under combined application of magnetic anomaly in the ground check with verify speed, verify the effect to be good, is feasible and effective to verify the combination of methods. |
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