Influence of Minibasin Obstruction on Canopy Dynamics in the northern Gulf of Mexico
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Abstract:
In salt-detached gravity-gliding/spreading systems the detachment geometry is a key control on the downslope mobility of the supra-salt sequence. Here we used regional 3D seismic data to examine a salt-stock canopy in the northern Gulf of Mexico slope, in an area where supra-canopy minibasins subsided vertically and translated downslope above a complex base-of-salt. If thick enough, minibasins can interact with, and weld to, the base-of-salt and be obstructed from translating downslope. Based on the regional maps of the base of allochthonous salt and the base of the supra-canopy sequence, the key controls on minibasin obstruction, we distinguished two structural domains in the study area: a highly obstructed domain and a highly mobile domain. Large-scale translation of the supra-canopy sequence is recorded in the mobile domain by a far-travelled minibasin and a ramp syncline basin. These two structures suggest downslope translation on the order of 40 km from Plio-Pleistocene to Present. In contrast, translation was impeded in the obstructed domain due to supra-canopy bucket minibasins subsiding into feeders during the Pleistocene. As a result, we infer that differential translation occurred between the two domains and argue that a deformation area between two differentially translating supra-canopy minibasin domains is difficult to recognize. However, characterizing domains according to base-of-salt geometry and supra-canopy minibasin configuration can be helpful in identifying domains that may share similar subsidence and downslope translation histories.Keywords:
Salt tectonics
Plant canopy
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Winter wheat canopy spectrum is dominated by wheat canopy closures, in this study. Our purpose is to study the quantitative influence of canopy closures on field canopy spectrum by quantitative reduced canopy stem densities. It indicated that canopy reflectance of winter wheat under different canopy stem densities has significant difference in near infrared bands. It has line relationship between spectral reflectance of 100% canopy stem densities and spectral reflectance under canopy stem densities, all the coefficients of determination (R2) for the equations are exceeding 0.8452, and all the results are surprised well. Canopy reflectance difference of winter under different stem densities were also studied, they all have line relationships between canopy reflectance of 100% canopy stem densities and quantitative reduced canopy stem densities, the simulation equations are different for the erective cultivars and loose cultivars. Relationship between canopy closures and canopy stem densities were also studied too, it has positive relationship between canopy closures and canopy stem densities, it reveals a very good agreement between canopy closures and canopy stem densities, with a coefficient of determination (R2) 0.8467, so the canopy stem densities can be simulated by canopy closures.
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