Changes

* Physical: the density difference between the magma (lower density) and the host rocks is a key factor. Archimedes' principle is the one who acts. The surrounding rocks exert an upward thrust that moves the crustal magma to levels where their density is equated with the host rocks. It may happen that the density remains below the rocks of the environment and that the magma is detained its vertical ascent, the factor involved here are local efforts. If the efforts of the magma pressure can not overcome the resistance of the rocks magma vertically looking for a new way of moving through a plane of weakness such as a stratigraphic unconformity, anisotropy of the medium as fault planes, hinges of [[fold]]s, etc (Figure 3).

* Physical: the density difference between the magma (lower density) and the host rocks is a key factor. Archimedes' principle is the one who acts. The surrounding rocks exert an upward thrust that moves the crustal magma to levels where their density is equated with the host rocks. It may happen that the density remains below the rocks of the environment and that the magma is detained its vertical ascent, the factor involved here are local efforts. If the efforts of the magma pressure can not overcome the resistance of the rocks magma vertically looking for a new way of moving through a plane of weakness such as a stratigraphic unconformity, anisotropy of the medium as fault planes, hinges of [[fold]]s, etc (Figure 3).

[[File:IMAGEN 3.png|300px|thumbnail|center|Figure 3: In this photograph the site of two sills can be seen in a bedrock (Vaca Muerta Fm). Right on the sector focuses it can be clearly seen intense fracturing of columnar pattern. Photo courtesy of Juan Spacapan.]]

[[File:IMAGEN 3.png|300px|thumbnail|center|Figure 3: In this photograph the site of two sills can be seen in a bedrock (Vaca Muerta Fm). Right on the sector focuses it can be clearly seen intense fracturing of columnar pattern. Photo courtesy of Juan Spacapan.]]

Another important physical factor is the pore pressure. In porous sedimentary rocks saturated with fluids such as water and hydrocarbons, fracture resistance is reduced. This is why it can almost be deduced that the location of the intrusive within a sedimentary basin would be concentrated within shale formations (high porosity) with plenty of oil (Figure 4 and 5).

 

Another important physical factor is the pore pressure. In porous sedimentary rocks saturated with fluids such as water and hydrocarbons, [[fracture]] resistance is reduced. This is why it can almost be deduced that the location of the intrusive within a sedimentary basin would be concentrated within shale formations (high porosity) with plenty of oil (Figure 4 and 5).

[[File:IMAGEN 5.png|300px|thumbnail|left|Figure 4: Diagram relating the fluid pressure with the decrease in resistance of the country rock with increasing depth . Notice how the anisotropy of the medium magnify the value of T ( tensile stress) in the horizontal direction. Taken from Gressier et al 2010.]] [[File:IMAGEN 6.png|400px|thumbnail|center|Figure 5: experiment by Gressier et al 2010 made into a powder through diatomaceous saturated and unsaturated to simulate fluid through the sediment site. Magma was simulated with silicone caulk which behaves as an ideal Newtonian fluid. The conclusion of this experiment is that in a supersaturated fluid medium and the main effort horizontally oriented sill development is full.]]

[[File:IMAGEN 5.png|300px|thumbnail|left|Figure 4: Diagram relating the fluid pressure with the decrease in resistance of the country rock with increasing depth . Notice how the anisotropy of the medium magnify the value of T ( tensile stress) in the horizontal direction. Taken from Gressier et al 2010.]] [[File:IMAGEN 6.png|400px|thumbnail|center|Figure 5: experiment by Gressier et al 2010 made into a powder through diatomaceous saturated and unsaturated to simulate fluid through the sediment site. Magma was simulated with silicone caulk which behaves as an ideal Newtonian fluid. The conclusion of this experiment is that in a supersaturated fluid medium and the main effort horizontally oriented sill development is full.]]