"Many spheroid rocks on Mars are concretions that have eroded out of softer matrix rock
, such as copious iron-containing spherules examined by the Opportunity rover," Guy Webster, from the media relations office at NASA's Jet Propulsion Laboratory, told International Business Times.
Firstly, there would be fluid flow within the fracture network and matrix rock and fluid exchange or fluid leak between the fracture and the surrounding porous media, because of the pressure difference between the fracture network and the matrix rock during fracturing fluid pumping.
The fractured porous media were composed of matrix rock and macro fractures as a whole.
As the fractures are generally very thin and highly permeable compared to the surrounding matrix rock
, the gradient of fracture pressure normal to the fracture is negligible.
This allows the steam to work at its optimum level to heat the matrix rock
and the large volume of oil contained in its pores.
With regard to stable isotope values, dedolomite and calcite fillings differ essentially between samples, from each other and from the matrix rock
. Large differences exist between adjacent host rock and fracture fillings (Fig.
The majority of the calcite crystals, some covered by thin quartz layers, were jarred loose from the matrix rock
in the course of collecting; these crystals were later gathered by hand from the floors of the cavities.
Its name comes from Latin "granatus" meaning seed, because it often resembles small round seeds when found in its matrix rock
As a matter of fact, in an Alpine cleft these points of nucleation are already present in the matrix rock
. Their orientation can be taken as stochastic (random), but in the case of metamorphic rocks they can also have certain statistically predominant orientations.
Botryoidal hyaline opal is the only other common mineral, although it is usually overlooked because it is almost invisible on the white matrix rock
The recovery of stibnite crystals attached to their silicified limestone matrix rock
presents a nearly insurmountable challenge to the miners because of the lack of adequate specimen recovery tools and technology and because of time constraints imposed by the pre-eminent goal of maintaining ore production schedules.
It is therefore imperative to have a greater understanding of the physical properties of the matrix rocks
that compose the geothermal systems.