Gravity data observed in geophysical surveys are the sum of potential field produced by all underground inhomogeneous geological sources with different scales,different patterns and different depths. The aim of gravit...Gravity data observed in geophysical surveys are the sum of potential field produced by all underground inhomogeneous geological sources with different scales,different patterns and different depths. The aim of gravity exploration is mainly to extract the meaningful local anomaly from the regional gravity anomaly which is helpful to detect the deep structure and delineate the favorable area for mineral prospecting. In this paper,several anomaly separation methods are theoretically discussed,including trend analysis method,finite element method,interpolating cut method and analytic continuation method. And,these methods are applied to achieve the delineation of potash-mine deposit in Vientiane. Through experiments,analysis and comparison,the separating result of upward continuation is shown to be satisfactory,for that can separate the ore body anomaly from the background field more effectively. Further,with the combination of the geological information and gravity anomaly,it infers four rich potash zones in the study area of Vientiane which is significant for future geological work.展开更多
In its 2014 version of top 10 ground-breaking discoveries and achievements released on December 19,Science,the world-leading journal included the transition from dinosaurs to birds in its annual selection,noting that ...In its 2014 version of top 10 ground-breaking discoveries and achievements released on December 19,Science,the world-leading journal included the transition from dinosaurs to birds in its annual selection,noting that a series of papers detailed how certain dinosaurian lineages developed small,lightweight body features,which have enabled them to evolve into birds and gain the ability to fly.The dinosaur-bird transition,now evaluated as one展开更多
文摘Gravity data observed in geophysical surveys are the sum of potential field produced by all underground inhomogeneous geological sources with different scales,different patterns and different depths. The aim of gravity exploration is mainly to extract the meaningful local anomaly from the regional gravity anomaly which is helpful to detect the deep structure and delineate the favorable area for mineral prospecting. In this paper,several anomaly separation methods are theoretically discussed,including trend analysis method,finite element method,interpolating cut method and analytic continuation method. And,these methods are applied to achieve the delineation of potash-mine deposit in Vientiane. Through experiments,analysis and comparison,the separating result of upward continuation is shown to be satisfactory,for that can separate the ore body anomaly from the background field more effectively. Further,with the combination of the geological information and gravity anomaly,it infers four rich potash zones in the study area of Vientiane which is significant for future geological work.
文摘In its 2014 version of top 10 ground-breaking discoveries and achievements released on December 19,Science,the world-leading journal included the transition from dinosaurs to birds in its annual selection,noting that a series of papers detailed how certain dinosaurian lineages developed small,lightweight body features,which have enabled them to evolve into birds and gain the ability to fly.The dinosaur-bird transition,now evaluated as one
