| 平桂地区遥感线性构造的分形特征及其地质意义 |
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| 关键词:Remote sensing lineation fractal dimension Pinggui area Guangxi |
| 基金项目:广西自然科学基金（桂科自:9912011）；国土资源大调查项目（编号:200113000040） |
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| Fractal Characteristics of Remote Sensing Lineations in Pinggui Area and Their Geological Significance |
| Based on the theory and methodology of fractal geometry, the authors have quantitatively studied remote sensing lineations in Pinggui area of Guangxi. The fractal dimensions( FD) for the remote sensing lineations within 345 subdivisions( each with an area of 25 km2) on the 0.3125 - 2.5000 km range of scale are from 0.8686 to 1.5909, and the square correlation coefficient of the regression line(R2) is higher than 0. 9729, if a box-counting technique is used. The results indicate that the statistical self-similarity and fractal characteristics of the remote sensing lineations in each subdivision are well developed. The temporal and spatial distribution pattern of FD for the lineations and its relations to the deep structures and the location of ore deposits are also studied and discussed. The highest average FD for the lineations is found in granitoid(DG = 1. 3015), and lower values are found in geosynclinal system(DGs = 1.2099), platform system(Dps = 1.1654) and Diwa system(DDW = 1.1258). In addition, the average FD in subdivision containing W, Sn, Cu, Pb, and Zn polymetallic deposits is significantly higher than that of the tectonic unit to which the subdivision belongs. For instance, The average FD( 1.4235; from 1.4080 to 1.4973) in subdivisions which host Huashan Sn and W deposits in granitoid area is significantly higher than DG. The average FD( 1.4307; from 1.3454 to 1. 5686) in subdivisions which host Shanhu and Xinlu W, Sn and deposits in platform system is significantly higher than DDW. The average FD (1. 3862; from 1. 3059 to 1. 5732) in subdivisions which host Huangyao and Dayao Cu, Pb, and Zn polymetallic deposits on the margin of the platform system is significantly higher than the average FD(1.1782) of DGS and DPS. There are two high FD zones and one low FD zone in EW direction on the FD five-step tendency analysis map. The two high FD zones match Huashan-Guposhan and Songmaoding-Daguishan uplift belts,respectively. The low FD zone between the two FD high zones matches Zhongshan-Hezhou depression belt. Furthermore, the high or low FD districts in both high and low FD zones match the sub-uplifts or sub-depressions in both uplift and depression belts. The distribution pattern shown on the five-step tendency map of the FD corresponds to the overall deep structure pattern derived from gravityand magnetic data. It is therefore considered that the FD for the lineations can be used as an important element or a quantitative index for deep structure interpretation and deposit targeting. |
| FENG Zuo-Mei,LIANG Jin-cheng,LI Xiao-feng,ZHANG Gui-lin,HAN Xi-bin.2002.Fractal Characteristics of Remote Sensing Lineations in Pinggui Area and Their Geological Significance[J].Acta Geoscientica Sinica,23(6):563-566. |
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