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The Lüliangshan area is located on the Qaidam Northern Margin Orogenic Belt.In the area distributes desert and gobi landscape, and influenced by factors such as aeolian deposit, a lot of geological anomalous information is blurred or buried, imposing serious interference on geological prospecting work.Based on the unique landscape and metallogenic settings in the Lüliangshan area, a geochemical data processing method based on ore-forming element complexity is used to analyze the 1 ∶50 000 stream sediment survey results and rapidly selects important prospecting target areas.After verification, Yuqia Copper-Gold Deposit is discovered, providing references for further prospecting. [ABSTRACT FROM AUTHOR]

BACKGROUND: There is a certain deviation between the on-site analysis results of hand-held XRF and the laboratory analysis results due to the unique technical difficulties in field X-ray fluorescence measurement such as roughness effect, uneven effect and humidity effect of samples. OBJECTIVES: To seek economic, rapid and practical porphyry copper ore in practical work. test conditions of hand-held XRF for rapid exploration of METHODS: Influence of test conditions, such as analytical time, sample content, test distance, sample dry humidity and sample particle size on the analytical results of Niton XL31 GOLDD+ hand held XRF was quantitatively studied. RESULTS: The results showed that, under the best test time of 90s, the determination limits of Cu, Mo, Pb, and Zn were 57 μg/g. 14μg/g, 24ug/g, and 38μg/g, respectively, and the calculation formula for the determination limit was given. The field analysis test distance should be less than 5mm and the sample surface should be kept dry. The test method for bulk sample was the simplest but the test results varied the most. When sample was crushed to a particle size of 80 mesh or above, the stability and accuracy of the results were best. Considering that it took a long time to crush sample into 80 mesh, the mixed state of the sample after crushing was better strategy for field testing. CONCLUSIONS: The practical application of core scanning in Qulong porphyry copper deposit in Tibet shows that the handheld XRF analyzer is suitable for in-situ analysis and can meet the requirements of rapid exploration and evaluation such as delineation of copper ore bodies in field, which can greatly improve work efficiency and reduce exploration cost. [ABSTRACT FROM AUTHOR]

The ore-forming prospect of eclogite-type rutile in Yuqia is different from that in West Tieshiguan,located in the northern Qaidam ultrahigh-pressure(UHP) metamorphic belt.Recently,the large eclogite-type rutile ore deposit in Yuqia is found,but only titaniummineralization in West Tieshiguan is found.Based on detailed field geological and microscopic observation,the major elements were analyzed by electron probe;moreover,the in-situ trace element contents in garnet collected from the deposits were performed by LA-ICP-MS.The results show that the occurrences of Yuqia and West Tieshiguan eclogites are basically identical.Yuqia eclogite degenerates weakly with mineral idiomorphic granular,and garnets contain more inclusions.Major and trace earth elements have well-developed zoning characteristic,and the mantle and rim enrich rare earth element in garnets.Relatively,the degeneration of West Tieshiguan eclogite is strong and mineral xenomorphic-granular.Some garnets of eclogites contain less inclusions and the zoning of major element has been homogenized,rare earth elements of the core and mantle are more than the side.Combining the chronology evidences,Yuqia eclogite undergoes rapid subduction and exhumation of the dynamic process,and the rutiles barely turn into ilmenites.West Tieshiguan eclogite undergoes an evolution history with a rapid burial and slow uplift,and the rutiles nearly turn into ilmenites,which reveal the differences between the dynamics process and the occurrence state of rutile.These characters provide directions for the study area to further find eclogite-type rutile deposits in the northern Qaidam UHP metamorphic belt. [ABSTRACT FROM AUTHOR]