0183;Here we examine the chemical and mineralogical depth profiles through a 4 m thick soil formed on top of a 200 ma Pennsylvania diabase.From weathering profiles of Na, Mg and Si in the soil formed on this diabase, we calculate dissolution rates of the primary minerals plagioclase and augite using the method of White (2002).We also treat the bulk diabase with a[
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Study on micro-pore evolution law and shear mechanical behavior of grouting fractured rock mass under freeze-thaw cycle: ZHANG Jiafan1，XU Rongping1，LIU Yang1，2，ZHANG Huimei1
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0183;Request PDF | Feedbacks among O2 and CO2 in deep soil gas, oxidation of ferrous minerals, and fractures: A hypothesis for steady-state regolith thickness | O2 and CO2, the two essential reactants[سؤال
0183;I chose to use the low-velocity diabase–peridotite–serpentinite system D′PS to model the lower part of layer 2 (6.1 < V P < 6.5 km s −1) and the gabbro–peridotite–serpentinite system GPS to model layer 3 (V P > 6.5 km s −1) because gabbros are almost certainly more common than diabases in the lower crust, and because point G lies&سؤال
0183;The hydrogeologic investigation at the Boarhead Farms Superfund site was done to characterize the framework of the diabase aquifer underlying the site. The primary water-producing fracture system is less than 30 feet below land surface. Water-bearing fractures were not found deeper than 50 feet below land surface. The overburden soil is thin and ranges from[سؤال
0183;In a weathering rind profile, weathering reaction fronts are defined relative to the fracture surface, tracking loss of mobile components from the un-weathered interior of the rock towards the fracture. In either case, the thickness of the weathering reaction front is inversely proportional to the reaction time, such that sample points furthest[سؤال
0183;The diabase dikes recovered during Leg 140 display four types of mineralogical alteration: (1) chlorite + amphibole + titan- which suggest a difference in fluid pressure in pores and fractures. The temperature of the main alteration types ranged between 350&سؤال
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Example 7.7 Test data are given in Table E7.7(a) for static fracture of siliceous sandstone, including simple tension, simple compression, and two tests in compression with lateral pressure p surrounding all sides of the test specimen. The applied stresses at fracture are denoted 03, and the lateral stresses as a = 02 = -p.
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0183;Diabase hand specimen . Where does diabase form? Diabase is an intrusive igneous rock with the same mineral composition as basalt. It cools under basaltic volcanoes, like those at mid-ocean ridges. Diabase cools moderately quickly when magma moves up into fractures and weak zones below a volcano.[سؤال
0183;Experts and scholars around the world have conducted numerous experimental studies on fracture grouting methods [4].Yun et al. [5] carried out fracture grouting tests for different sand samples and derived the fracture initiation pressure equation. Fang et al. [6] managed the water damage problem in water-rich coal seams by high-pressure grouting, but[سؤال
0183;Diabase Diabes is green to brown, and contains plagioclase, labradorite, olivine, hornblende, magnetite, limenite, apatite, calcite, pyrrhotite, chalcopyrite, serpentine, clorite, and calcite. It is a fine grained, dark colored igneous rock composed of lath shaped plagioclase (feldspar) crystals surrounded by smaller grains of pyroxene and olivine.[سؤال
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As fractures opened, O2-rich fluids penetrated the rock via advection even below the groundwater table, driving both biotite and plagioclase dissolution. In contrast, the diabase had similar nanoporosity, but did not oxidize at depth or fracture, presumably because O2 was depleted high in the profile of this Fe-rich lithology.
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Thin section photomicrographs: (a) diabase, (b) dolomite, (c) relatively fine-grained argillaceous dolomite, (d) relatively uniformly textured dolomitic limestone, (e) limestone with locally
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0183;Effect of diabase intrusion on the CBM-bearing coalfields of southern Brazil: A review are cut and locked into canisters for desorbed gas measurements in a temperature-controlled table positioned in a mobile laboratory, that simulates the reservoir temperature conditions of the samples. CBM002-CL-RS and CBM001-MO-RS) may have some[سؤال
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The results of two tests on diabase rock are given in Table P7.42: (1) a uniaxial compression test, and (2) a confined compression test with lateral pressure $\sigma_{1}=\sigma_{2}$. (a) Assume that the Coulomb-Mohr fracture criterion applies, and use the results of these tests to determine the slope and intercept constants $\mu$ and $\tau_{i
[سؤال0183;Grouting reinforcement, which has an obvious strengthening effect on fractured rock mass, has been widely used in various fields in geotechnical engineering. The rheological properties of grout will greatly affect its diffusion radius in rock fractures, and the water–cement ratio is an important factor in determining the grouting flow patterns. The relationship between[سؤال
0183;1. The natural rock mass is mostly non-continuum due to the existence of weak structural planes such as joints and cracks, many theoretical researches and engineering practices show that the destab...[سؤال
0183;Samples of both Maryland diabase and Columbia diabase were investigated to measure the effects of temperature, oxygen fugacity, and plagioclase-to-pyroxene ratio on creep strength. Flow laws determined for creep of these diabases were characterized by an activation energy of Q = 485&سؤال
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As fractures opened, O2-rich fluids penetrated the rock via advection even below the groundwater table, driving both biotite and plagioclase dissolution. In contrast, the diabase had similar nanoporosity, but did not oxidize at depth or fracture, presumably because O2 was depleted high in the profile of this Fe-rich lithology.
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For the diabase formation without micro-fractures, the collapse pressure increases by 10.7% when the seepage of drilling fluid is considered; for the diabase with micro-fractures In the formation, ignoring the seepage of drilling fluid and considering the weak surface effect of micro-fractures, the collapse pressure increased by 21.4%.
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0183;Rockman's igneous rock specimens are hand broken as opposed to being crushed which helps keep cleavage and fracture characteristics intact and provides freshly broken areas for better examination of the specimens. Diabase. 1 Large Sample [RI045d] Item Number: Diorite (medium grained, black and white) Diorite. 10 Pack - Small [RI050b] 10[سؤال
0183;The study site is a 4-m regolith profile developed on an oak-dominated ridge top underlain by diabase in central Pennsylvania (PA, U.S.A.). Diabase in Pennsylvania is present primarily as sills and dikes that occur in large swarms that can extend for kilometers (Mottana et al., 1977, Smith et al., 1975).The primary silicate minerals in the PA diabase are plagioclase[سؤال
0183;Exp Mech (2011) 51:303–313 305 Fig. 1 Initial and deformed patterns where f(x,y)is the gray level value at coordinate (x,y) for initial image and f ∗(x∗,y )is the gray level value at point (x∗,y∗) of the deformed image. The coordinates (x,y)and (x∗,y∗)are related by the deformation which has occurred between acquisition of the two images. If the motion of the[سؤال
0183;fracture properties, such as, fracture aperture and filling material or fracture permeability and porosity. For fractured formations of double porosity, the porosity and the permeability of the blocks should also be known. Such a scale of representation of a fractured formation, at the level of the fractures, similar to the description of a[سؤال
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The transition from high-temperature creep to brittle fracture in Maryland diabase was investigated as a function of confining pressure and strain rate. Experiments were conducted at 1000&سؤال
0183;Cooling fractures are widely observed from diabase samples. These fractures are more developed at margins than in the center, having characteristics of cutting condensing surface and irregular morphologies (Fig. 2 f). By contrast, structural fractures developed on diabase are usually directional, straight, and discontinuous (Fig. 2 g[سؤال
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Fracture: Dolerite has a conchoidal fracture, which is a characteristic of igneous rocks. Dolerite is an intrusive igneous rock that is composed mainly of plagioclase feldspar and pyroxene. It is formed when magma is intruded into other rocks, and then cools and solidifies underground.
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Meanwhile, various porosity types were developed, including primary vesicles, grain-dissolved micropores, contractive micropores, cooling fractures, and structural fractures in the diabases, and recrystallizational and matrix-dissolved micropores, hydrothermal and
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176; (SEE) occur at a depth of 34.459 m (figure 9). The SEE-dipping fractures have been transformed and crosscut by the W-dipping fracture in the BHTV images.&سؤال
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