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Journal articles on the topic 'Lithostatic pressure'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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1

Raimbourg, Hugues, and Gaku Kimura. "Non-lithostatic pressure in subduction zones." Earth and Planetary Science Letters 274, no. 3-4 (2008): 414–22. http://dx.doi.org/10.1016/j.epsl.2008.07.037.

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2

Tajčmanová, Lucie, Paola Manzotti, and Matteo Alvaro. "Under Pressure: High-Pressure Metamorphism in the Alps." Elements 17, no. 1 (2021): 17–22. http://dx.doi.org/10.2138/gselements.17.1.17.

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The mechanisms attending the burial of crustal material and its exhumation before and during the Alpine orogeny are controversial. New mechanical models propose local pressure perturbations deviating from lithostatic pressure as a possible mechanism for creating (ultra-)high-pressure rocks in the Alps. These models challenge the assumption that metamorphic pressure can be used as a measure of depth, in this case implying deep subduction of metamorphic rocks beneath the Alpine orogen. We summarize petro-logical, geochronological and structural data to assess two fundamentally distinct mechanism
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3

Moulas, Evangelos, Stefan M. Schmalholz, Yury Podladchikov, Lucie Tajčmanová, Dimitrios Kostopoulos, and Lukas Baumgartner. "Relation between mean stress, thermodynamic, and lithostatic pressure." Journal of Metamorphic Geology 37, no. 1 (2018): 1–14. http://dx.doi.org/10.1111/jmg.12446.

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4

Tajčmanová, L. "Deviations from lithostatic pressure during metamorphism: fact or fiction?" Journal of Metamorphic Geology 33, no. 8 (2015): 783–84. http://dx.doi.org/10.1111/jmg.12152.

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5

Zencher, Francesca, Maurizio Bonafede, and Ragnar Stefansson. "Near-lithostatic pore pressure at seismogenic depths: a thermoporoelastic model." Geophysical Journal International 166, no. 3 (2006): 1318–34. http://dx.doi.org/10.1111/j.1365-246x.2006.03069.x.

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6

Sibson, Richard H. "Fault-valve behavior and the hydrostatic-lithostatic fluid pressure interface." Earth-Science Reviews 32, no. 1-2 (1992): 141–44. http://dx.doi.org/10.1016/0012-8252(92)90019-p.

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7

Polyansky, O. P., I. I. Likhanov, A. V. Babichev, P. S. Kozlov, S. V. Zinoviev, and V. G. Sverdlova. "Fault Tectonites of the Yenisei Shear Zone (Yenisei Ridge): Evidence and Thermomechanical Numerical Model of Generation of Tectonic Overpressure." Петрология 32, no. 1 (2024): 19–45. http://dx.doi.org/10.31857/s0869590324010036.

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Based on the proposed numerical model of the stress-strain state of polymineral rocks, which describes the formation of blastomylonites in the Yenisei Regional Shear Zone (PRSZ) in the Yenisei Ridge, the possibility of local tectonic overpressure exceeding the lithostatic pressure in rocks subjected to shear deformations is shown. For tectonites of the southern (Angara-Kan block) and northern (Isakovka terrane and Garevka complex) segments of the PRSZ, estimates of the maximum overpressure were obtained from 2–3 to 4–5 kbar, which range from 25 to 50% of the lithostatic pressure. It is shown t
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8

Kidder, S., J. P. Avouac, and Y. C. Chan. "Application of titanium-in-quartz thermobarometry to greenschist facies veins and recrystallized quartzites in the Hsüehshan range, Taiwan." Solid Earth Discussions 4, no. 1 (2012): 663–706. http://dx.doi.org/10.5194/sed-4-663-2012.

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Abstract. The accuracy, reliability and best practices of Ti-in-quartz thermobarometry ("TitaniQ") in greenschist facies rocks have not been established. To address these issues we measured Ti concentrations in rutile-bearing samples of moderately deformed, partially recrystallized quartzite and vein quartz from Taiwan's Hsüehshan range. The spread of Ti concentrations of recrystallized grains in quartzite correlates with recrystallized grain size. Recrystallized quartz (grain size ~300 μm) that formed during early deformation within the biotite stability field shows a marked increase in inter
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9

Ujiie, Kohtaro, Hanae Saishu, Ake Fagereng, et al. "An Explanation of Episodic Tremor and Slow Slip Constrained by Crack‐Seal Veins and Viscous Shear in Subduction Mélange." Geophysical Research Letters 45 (May 29, 2018): 5371–79. https://doi.org/10.1029/2018GL078374.

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Episodic tremor and slow slip (ETS) occurs in the transition zone between the locked seismogenic zone and the deeper, stably sliding zone. Actual mechanisms of ETS are enigmatic, caused by lack of geological observations and limited spatial resolution of geophysical information from the ETS source. We report that quartz‐filled, crack‐seal shear and extension veins in subduction mélange record repeated low‐angle thrust‐sense frictional sliding and tensile fracturing at near‐lithostatic fluid pressures. Crack‐seal veins were coeval with viscous shear zones that accommodated deformation by
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10

Jourdon, Anthony, and Dave A. May. "An efficient partial-differential-equation-based method to compute pressure boundary conditions in regional geodynamic models." Solid Earth 13, no. 6 (2022): 1107–25. http://dx.doi.org/10.5194/se-13-1107-2022.

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Abstract. Modelling the pressure in the Earth's interior is a common problem in Earth sciences. In this study we propose a method based on the conservation of the momentum of a fluid by using a hydrostatic scenario or a uniformly moving fluid to approximate the pressure. This results in a partial differential equation (PDE) that can be solved using classical numerical methods. In hydrostatic cases, the computed pressure is the lithostatic pressure. In non-hydrostatic cases, we show that this PDE-based approach better approximates the total pressure than the classical 1D depth-integrated approa
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11

Ma, Weijiao, Yunpeng Wang, Jinzhong Liu, and Jinbu Li. "Dual-pressure pyrolysis apparatus unravelling how fluid and lithostatic pressure matter in hydrocarbon expulsion." Organic Geochemistry 203 (May 2025): 104932. https://doi.org/10.1016/j.orggeochem.2025.104932.

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12

Kidder, S., J. P. Avouac, and Y. C. Chan. "Application of titanium-in-quartz thermobarometry to greenschist facies veins and recrystallized quartzites in the Hsüehshan range, Taiwan." Solid Earth 4, no. 1 (2013): 1–21. http://dx.doi.org/10.5194/se-4-1-2013.

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Abstract. The accuracy, reliability and best practises of Ti-in-quartz thermobarometry (TitaniQ) in greenschist facies rocks have not been established. To address these issues, we measured Ti concentrations in rutile-bearing samples of moderately deformed, partially recrystallized quartzite and vein quartz from the Hsüehshan range, Taiwan. The spread of Ti concentrations of recrystallized grains in quartzite correlates with recrystallized grain size. Recrystallized quartz (grain size ~100–200 μm) that formed during early deformation within the biotite stability field shows a marked increase in
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13

Angel, R. J., P. Nimis, M. L. Mazzucchelli, M. Alvaro, and F. Nestola. "How large are departures from lithostatic pressure? Constraints from host-inclusion elasticity." Journal of Metamorphic Geology 33, no. 8 (2015): 801–13. http://dx.doi.org/10.1111/jmg.12138.

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14

Rebetsky, Yu L. "On the Mechanisms of Generation of Excessive Horizontal Compression in the Continental Crust." Физика земли 2023, no. 3 (2023): 63–77. http://dx.doi.org/10.31857/s0002333723030109.

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It is proposed to consider the processes of surface denudation and crustal magmatism to explain the formation of increased horizontal compressive stresses in the crust, which are excessive relative to the lithostatic pressure. Exhumation of a rock results in only partial unloading of the crust due to the removal of the weight of the overburden, unless the crust is above the yield point. This is due to the fact that in the case of exhumation, the unloading follows the elastic law. As a result, residual stresses of horizontal compression received at the stage of cataclastic flow arise in the roc
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15

Tsuruoka, Subaru, Thomas Monecke, and T. James Reynolds. "Evolution of the Magmatic-Hydrothermal System at the Santa Rita Porphyry Cu Deposit, New Mexico, USA: Importance of Intermediate-Density Fluids in Ore Formation." Economic Geology 116, no. 6 (2021): 1267–84. http://dx.doi.org/10.5382/econgeo.4831.

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Abstract The Santa Rita porphyry Cu deposit in New Mexico, USA, is characterized by a stockwork of three vein types that differ in morphology, mineralogy, and associated alteration assemblages. Early quartz veins associated with potassic alteration are composed of recrystallized granular quartz grains that host ubiquitous hypersaline liquid and vapor-rich fluid inclusions. The early quartz likely formed at high (≳500°C) temperatures and lithostatic pressures. Hypogene Cu mineralization at Santa Rita is in sulfide veins that reopened or crosscut the early quartz veins. The sulfide veins are sur
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16

Hall, P. L. "Physical and chemical aspects of the development of overpressuring in sedimentary environments." Clay Minerals 29, no. 4 (1994): 425–37. http://dx.doi.org/10.1180/claymin.1994.029.4.03.

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AbstractFluid pressures in argillaceous sediments depend on, inter alia, mechanical stresses, temperature, diagenetic volume changes and permeability. However, the relative influence of the pressuring mechanisms depends critically upon the long time-scale compliance, C, of the overpressured layer.In sediments undergoing first-time burial and currently exposed to their historically maximum applied stresses, C can be relatively large. Here, fluid pressure increases are principally due to mechanical causes, and overpressuring will be associated with undercompaction. The tendency for undercompacti
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17

Thomas, Amanda M., Robert M. Nadeau, and Roland Bürgmann. "Tremor-tide correlations and near-lithostatic pore pressure on the deep San Andreas fault." Nature 462, no. 7276 (2009): 1048–51. http://dx.doi.org/10.1038/nature08654.

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18

Shmakin, B. M. "Some New Data on the Genesis of Granitic Pegmatites." Journal Geological Society of India 33, no. 6 (1989): 566–75. http://dx.doi.org/10.17491/jgsi/1989/330608.

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Abstract The correlation between the type of mineralization in granitic pegmatites and the depth of their formation is supported with new data. The fluid pressure in pegmatites is 2-3 times greater than that of the calculated lithostatic pressure due to the over-pressure of volatiles in the closed pegmatite system. Experimental work shows that during cooling the pegmatite melt saturated with volatile components divides into two or three fluids. Such a 'liquation' provides an explanation for many of the complex structures and peculiarities of the mineral composition obsei ved in pegmatites. In
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19

Seo, Jung Hun, Yevgeniya Kim, Tongha Lee, and Marcel Guillong. "Periodically Released Magmatic Fluids Create a Texture of Unidirectional Solidification (UST) in Ore-Forming Granite: A Fluid and Melt Inclusion Study of W-Mo Forming Sannae-Eonyang Granite, Korea." Minerals 11, no. 8 (2021): 888. http://dx.doi.org/10.3390/min11080888.

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The Upper Cretaceous Sannae-Eonyang granite crystallized approximately 73 Ma and hosted the Sannae W-Mo deposit in the west and the Eonyang amethyst deposit in the east. The granite contained textural zones of miarolitic cavities and unidirectional solidification texture (UST) quartz. The UST rock sampled in the Eonyang amethyst mine consisted of (1) early cavity-bearing aplitic granite, (2) co-crystallization of feldspars and quartz in a granophyric granite, and (3) the latest unidirectional growth of larger quartz crystals with clear zonation patterns. After the UST quartz was deposited, apl
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20

Zhang, Dongwei, Lihui Wang, Long Su, et al. "The chemical kinetics of the semi-open hydrous pyrolysis system: Time series analysis of lithostatic pressure and fluid pressure." International Journal of Coal Geology 220 (March 2020): 103418. http://dx.doi.org/10.1016/j.coal.2020.103418.

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21

Hanson, R. Brooks. "Hydrodynamics of magmatic and meteoric fluids in the vicinity of granitic intrusions." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 87, no. 1-2 (1996): 251–59. http://dx.doi.org/10.1017/s0263593300006660.

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ABSTRACT:Numerical models that account for fluid flow, magmatic and metamorphic fluid production, topography and thermal expansion of the fluid following emplacement of a granitic magma in the upper crust reveal controls on the distribution of magmatic fluids during the evolution of a hydrothermal system. Initially, fluid pressures are close to lithostatic in and near an intrusion, and internally generated magmatic and metamorphic fluids are expelled. Later, fluid pressures drop to hydrostatic values and meteoric fluids circulate throughout the system. High permeabilities and low rates of flui
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22

Brown, Michael. "Some thoughts about eclogites and related rocks." European Journal of Mineralogy 35, no. 4 (2023): 523–47. http://dx.doi.org/10.5194/ejm-35-523-2023.

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Abstract. The past 40 years have been a golden age for eclogite studies, supported by an ever wider range of instrumentation and enhanced computational capabilities, linked with ongoing developments in thermobarometry and geochronology. During this time, we have made robust estimates of pressure–temperature (P–T) conditions; determined ages related to the prograde, metamorphic peak and retrograde stages; and calculated time-integrated rates of cooling and exhumation for eclogites and related rocks, including blueschists, from orogenic belts worldwide. Improvements to single mineral thermometer
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23

Lerouge, Catherine, and Vincent Bouchot. "Conditions of formation and origin of fluids of quartz-tourmaline veins in the La Châtaigneraie tungstiferous district (Massif Central, France): fluid inclusions and stable isotopes." Bulletin de la Société Géologique de France 180, no. 3 (2009): 263–70. http://dx.doi.org/10.2113/gssgfbull.180.3.263.

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Abstract A combined stable-isotope and microthermometric study was applied to wolframite-bearing and arsenopy-rite-bearing quartz-tourmaline veins, quartz-tourmaline veins associated with leucogranite, schist and the two types of granite – massive monzogranite and leucogranite stocks – of the tungsten Châtaigneraie district, in order to estimate pressure-temperature formation conditions of quartz-tourmaline veins and determine the origin of mineralizing fluids. Pressure-temperature conditions of barren-quartz-tourmaline-veins are estimated at 1.4 ± 0.4 kbars (around 5 km depth under lithostat
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24

Srikantappa, C., M. Raith, and B. Spiering. "Progressive Charnockitization of a Leptynite-Khondalite Suite in Southern Kerala, India- Evidence for Formation of Charnockites Through Decrease in Fluid Pressure?" Journal Geological Society of India 26, no. 12 (1985): 849–72. http://dx.doi.org/10.17491/jgsi/1985/261201.

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Abstract The crustal segment south of the Achankovil zone in southern Kerala is built up by two litho-tectonic units: The Nagerkoil unit is represented by a series of acid to intermediate magmatogenic gneisses and charnockites associated with layered anorthositic to noritic complexes. The Pon Mudi unit consists of interlayered garnet-biotite gneisses (leptynites), garnet-biotite-sil1imanite gneisses (khondalites) and garnet-biotite-sillimanite-cordierite metatexites which represent a series of intensely deformed psammitic and pelitic sediments metamorphosed to upper amphibolite grade (700-750°
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25

Carcione, José M., and Anthony F. Gangi. "Gas generation and overpressure: Effects on seismic attributes." GEOPHYSICS 65, no. 6 (2000): 1769–79. http://dx.doi.org/10.1190/1.1444861.

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Drilling of deep gas resources is hampered by high risk associated with unexpected overpressure zones. Knowledge of pore pressure using seismic data, as for instance from seismic‐while‐drilling techniques, will help producers plan the drilling process in real time to control potentially dangerous abnormal pressures. We assume a simple basin‐evolution model with a constant sedimentation rate and a constant geothermal gradient. Oil/gas conversion starts at a given depth in a reservoir volume sealed with faults whose permeability is sufficiently low so that the increase in pressure caused by gas
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26

Kozhoukharova, Evgenia. "Two hundred years eclogites and one hundred years of eclogite discussion." Review of the Bulgarian Geological Society 82, no. 2 (2021): 65–71. http://dx.doi.org/10.52215/rev.bgs.2021.82.2.5.

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The first significant publication on eclogites (Escola, 1921) marked the start of the longest-discussed problem in petrology – the genesis and the place of eclogite formation and eclogite facies on the Earth. The mineral paragenesis of garnet, omphacite, rutile with rare inclusion of microdiamond in garnet requires conditions of T=800–1000 °C and P=0–60 kbar. According to the geothermal gradient and lithostatic pressure calculations, such conditions should exist at a depth of 60–250 km. The dominant nowadays “subduction-exhumation” hypothesis does not offer a satisfactory explanation of the id
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27

Jikich, Sinisha A., Robert T. McLendon, Kal Seshadri, Gino Irdi, and Duane H. Smith. "Carbon Dioxide Transport and Sorption Behavior in Confined Coal Cores for Carbon Sequestration." SPE Reservoir Evaluation & Engineering 12, no. 01 (2009): 124–36. http://dx.doi.org/10.2118/109915-pa.

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Summary Measurements of sorption isotherms and transport properties of carbon dioxide (CO2) in coal cores are important for designing enhanced coalbed-methane/CO2-sequestration field projects. Sorption isotherms measured in the laboratory can provide the upper limit on the amount of CO2 that might be sorbed in these projects. Because sequestration sites will most likely be in unmineable coals, many of the coals will be deep and under considerable lithostatic and hydrostatic pressures. These lithostatic pressures may reduce the sorption capacities and/or transport rates significantly. Consequen
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28

Holland, Marc, Janos L. Urai, Philippe Muchez, and Emanuel J. M. Willemse. "Evolution of fractures in a highly dynamic thermal, hydraulic, and mechanical system – (I) Field observations in Mesozoic Carbonates, Jabal Shams, Oman Mountains." GeoArabia 14, no. 1 (2009): 57–110. http://dx.doi.org/10.2113/geoarabia140157.

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ABSTRACT We studied an exhumed high-pressure cell in outcrops of Cretaceous carbonates on the southern flank of Jabal Shams in the Oman Mountains. This more than 2 km thick sedimentary pile contains reservoir and source rocks in northern Oman and the United Arab Emirates. It develops a complex and rapidly changing anisotropy, due to mechanical stratigraphy and several generations of pervasive regional fault and fracture sets. Calcite cement healed faults and fractures before the next sets were formed. Burial extension within a high fluid-pressure environment led to the formation of four fractu
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29

Morales-Arredondo, Ivan, María Aurora Armienta, and Nuria Segovia. "Groundwater Chemistry and Overpressure Evidences in Cerro Prieto Geothermal Field." Geofluids 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/2395730.

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In order to understand the geological and hydrogeological processes influencing the hydrogeochemical behavior of the Cerro Prieto Geothermal Field (CP) aquifer, Mexico, a characterization of the water samples collected from geothermal wells was carried out. Different hydrochemical diagrams were used to evaluate brine evolution of the aquifer. To determine pressure conditions at depth, a calculation was performed using hydrostatic and lithostatic properties from CP, considering geological characteristics of the study area, and theoretical information about some basin environments. Groundwater s
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30

Lima, A., R. J. Bodnar, B. De Vivo, F. J. Spera, and H. E. Belkin. "Interpretation of Recent Unrest Events (Bradyseism) at Campi Flegrei, Napoli (Italy): Comparison of Models Based on Cyclical Hydrothermal Events versus Shallow Magmatic Intrusive Events." Geofluids 2021 (October 14, 2021): 1–16. http://dx.doi.org/10.1155/2021/2000255.

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Several recent models that have been put forth to explain bradyseism at Campi Flegrei (CF), Italy, are discussed. Data obtained during long-term monitoring of the CF volcanic district has led to the development of a model based on lithological-structural and stratigraphic features that produce anisotropic and heterogeneous permeability features showing large variations both horizontally and vertically; these data are inconsistent with a model in which bradyseism is driven exclusively by shallow magmatic intrusions. CF bradyseism events are driven by cyclical magmatic-hydrothermal activity. Bra
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31

Lima, A., R. J. Bodnar, B. De Vivo, F. J. Spera, and H. E. Belkin. "Interpretation of Recent Unrest Events (Bradyseism) at Campi Flegrei, Napoli (Italy): Comparison of Models Based on Cyclical Hydrothermal Events versus Shallow Magmatic Intrusive Events." Geofluids 2021 (October 14, 2021): 1–16. http://dx.doi.org/10.1155/2021/2000255.

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Several recent models that have been put forth to explain bradyseism at Campi Flegrei (CF), Italy, are discussed. Data obtained during long-term monitoring of the CF volcanic district has led to the development of a model based on lithological-structural and stratigraphic features that produce anisotropic and heterogeneous permeability features showing large variations both horizontally and vertically; these data are inconsistent with a model in which bradyseism is driven exclusively by shallow magmatic intrusions. CF bradyseism events are driven by cyclical magmatic-hydrothermal activity. Bra
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32

Novikov, D. A. "Role of elision water exchange in formation of the Yamalo-Kara depression hydrodynamic field." Литология и полезные ископаемые, no. 3 (May 31, 2019): 248–61. http://dx.doi.org/10.31857/s0024-497x20193248-261.

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The unique material has been compiled on the hydrodynamics of oil and gas deposits of the Yamalo-Kara Depression for the first time in the last 30 years. The main feature of the region is the wide development of abnormally high formation pressures (Ka to 2.21) in both Jurassic and Lower Cretaceous horizons. Studying the filtration-capacitive properties and hydrodynamic characteristics of the Jurassic-Cretaceous reservoirs allows to established the predominate role of the elision water exchange in the formation of the modern hydrodynamic structure. At the depth of about 2–2.5 km elisional litho
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33

Birger, Boris I. "Internal friction in the Earth' crust and transverse seismic waves." AIMS Geosciences 8, no. 1 (2022): 84–97. http://dx.doi.org/10.3934/geosci.2022006.

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<abstract> <p>A transverse harmonic seismic wave, which propagates through the upper fractured layer of the Earth towards the Earth's surface, is considered. It is shown that the attenuation of a seismic wave in the Earth's upper crust is due to internal friction, i.e., friction between the sides of micro-fractures. Such a damping mechanism does not work in the deeper layers of the Earth where high lithostatic pressure prevents the movement along fractures. The governing equation for a brittle fractured medium is nonlinear. In the study of wave propagation, an approximate method of
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34

Beshentsev, V. A., I. G. Sabanina, O. G. Beshentseva, and R. N. Abdrashitova. "HYDROGEOCHEMICAL CONDITIONS OF THE MESOZOIC HYDROGEOLOGICAL BASIN IN THE TERRITORY OF THE YARUDEY OIL AND GAS CONDENSATE FIELD." Oil and Gas Studies, no. 4 (August 30, 2018): 15–20. http://dx.doi.org/10.31660/0445-0108-2018-4-15-20.

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Hydrogeochemical conditions of the Yarudey oil and gas condensate field are largely determined by its position within the elysion lithostatic water pressure system and the presence of a large number of faults in the base plate. In the article we explore the main features of the Neocomian and the Jurassic hydrogeological complexes of the field. Underground waters of the Mesozoic hydrogeological basin are characterized by chloride sodium ion-salt composition. They belong to the hydrocarbonate sodium type according to V. A. Sulin’s classification, mineralization is 7,0 g/l in the Neocomian comple
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35

Fulignati, Paolo. "Hydrothermal fluid evolution in the ‘Botro ai Marmi’ quartz-monzonitic intrusion, Campiglia Marittima, Tuscany, Italy. Evidence from a fluid-inclusion investigation." Mineralogical Magazine 82, no. 5 (2018): 1169–85. http://dx.doi.org/10.1180/mgm.2018.116.

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ABSTRACTThe quartz-monzonitic intrusion of ‘Botro ai Marmi’ in Tuscany, Italy, can be considered to be a typical example of an intrusion-centred magmatic hydrothermal system. The evolution of hydrothermal fluids in the ‘Botro ai Marmi’ intrusion was investigated using fluid-inclusion analyses to provide suitable physico-chemical constraints on the fluids involved in the late- to post-magmatic hydrothermal activity that affected the intrusion, providing inferences on their origin and variations of temperature and pressure with time.This work demonstrates that the earliest fluids circulating in
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36

Platt, John P. "Comment on “Channel flow, tectonic overpressure, and exhumation of high-pressure rocks in the Greater Himalayas” by Marques et al. (2018)." Solid Earth 10, no. 1 (2019): 357–61. http://dx.doi.org/10.5194/se-10-357-2019.

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Abstract. The upward-tapering channel model proposed by Marques et al. (2018) for the Himalayas has a “base” that forms part of the subducting footwall and therefore does not close the channel. This configuration does not produce return flow, and no dynamic overpressure develops in the channel. The geometrical and kinematic configuration they actually use for their calculations differs from this and is both geologically and mechanically improbable. In addition, the fixed upper boundary condition in their models is mechanically unrealistic and inconsistent with geological and geophysical constr
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37

Meriggi, R., P. Paronuzzi, and L. Simeoni. "Engineering geology characterization of lacustrine overconsolidated clays in an alpine area of Italy." Canadian Geotechnical Journal 37, no. 6 (2000): 1241–51. http://dx.doi.org/10.1139/t00-059.

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This study reports the main geotechnical characteristics of the Steggio Clay unit, a lacustrine sequence located in a valley of the Veneto Piedmont area (northern Italy). Analyzing the variations of overconsolidation pressure with depth, and the compressibility characteristics of natural, swelled, and reconstituted samples, one can hypothesize about the existence and influence of swelling processes on the stress history of the deposit. The yield pressures, determined by oedometric tests for the various lithostratigraphic units, are compared with the preconsolidation pressures deduced from the
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38

Oncken, O., S. Angiboust, and G. Dresen. "Slow slip in subduction zones: Reconciling deformation fabrics with instrumental observations and laboratory results." Geosphere 18, no. 1 (2021): 104–29. http://dx.doi.org/10.1130/ges02382.1.

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Abstract Cataclasites are a characteristic rock type found in drill cores from active faults as well as in exposed fossil subduction faults. Here, cataclasites are commonly associated with evidence for pervasive pressure solution and abundant hydrofracturing. They host the principal slip of regular earthquakes and the family of so-called slow earthquakes (episodic slip and tremor, low to very low frequency earthquakes, etc.). Slip velocities associated with the formation of the different types of cataclasites and conditions controlling slip are poorly constrained both from direct observations
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39

Akhmetov, Ayan Zh, and Igor Yu Smolin. "Computer modelling of the state of stress and strain of the Tunguska and Vilyui syneclises." Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, no. 75 (2022): 52–66. http://dx.doi.org/10.17223/19988621/75/5.

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The states of stress and strain are numerically analyzed under conditions of the geodynamic process of tension in the south part of the Vilyui syneclise and the middle part of the Tunguska syneclise. Two-dimensional models of geological structures of the south part of the Vilyui syneclise and the middle part of the Tunguska syneclise are constructed based on the Kimberlit-1981 geological profile obtained using deep seismic sounding. To describe the plastic strain in the geomedia, the model of elastic-plastic media with the non-associated plastic flow rule based on the Drucker-Prager-Nikolaevsk
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40

Imaz, A. Gil, A. Pocoví, M. Lago, and J. M. Parés. "Effect of lithostatic pressure and tectonic deformation on the magnetic fabric (anisotropy of magnetic susceptibility) in low-grade metamorphic rocks." Journal of Geophysical Research: Solid Earth 105, B9 (2000): 21305–17. http://dx.doi.org/10.1029/2000jb900171.

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41

Daley, T. M., M. A. Schoenberg, J. Rutqvist, and K. T. Nihei. "Fractured reservoirs: An analysis of coupled elastodynamic and permeability changes from pore-pressure variation." GEOPHYSICS 71, no. 5 (2006): O33—O41. http://dx.doi.org/10.1190/1.2231108.

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Equivalent-medium theories can describe the elastic compliance and fluid-permeability tensors of a layer containing closely spaced parallel fractures embedded in an isotropic background. We propose a relationship between effective stress (background or lithostatic stress minus pore pressure) and both permeability and elastic constants. This relationship uses an exponential-decay function that captures the expected asymptotic behavior, i.e., low effective stress gives high elastic compliance and high fluid permeability, while high effective stress gives low elastic compliance and low fluid perm
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42

Monecke, Thomas, Jochen Monecke, and T. James Reynolds. "The Influence of CO2 on the Solubility of Quartz in Single-Phase Hydrothermal Fluids: Implications for the Formation of Stockwork Veins in Porphyry Copper Deposits." Economic Geology 114, no. 6 (2019): 1195–206. http://dx.doi.org/10.5382/econgeo.4680.

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Abstract Porphyry copper deposits consist of low-grade stockwork and disseminated sulfide zones that contain characteristic vein generations formed during the evolution of the hydrothermal systems. The present contribution examines the influence of variable CO2 concentrations on the solubility of quartz in single-phase hydrothermal fluids forming stockwork veins in porphyry deposits at temperatures of 150° to 550°C and pressures ranging from 100 to 2,000 bar at concentrations up to 8 mol % CO2. The calculations demonstrate that quartz solubility in hydrothermal fluids decreases with increasing
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43

Behr, Whitney M., and Roland Bürgmann. "What’s down there? The structures, materials and environment of deep-seated slow slip and tremor." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2193 (2021): 20200218. http://dx.doi.org/10.1098/rsta.2020.0218.

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Deep-seated slow slip and tremor (SST), including slow slip events, episodic tremor and slip, and low-frequency earthquakes, occur downdip of the seismogenic zone of numerous subduction megathrusts and plate boundary strike-slip faults. These events represent a fascinating and perplexing mode of fault failure that has greatly broadened our view of earthquake dynamics. In this contribution, we review constraints on SST deformation processes from both geophysical observations of active subduction zones and geological observations of exhumed field analogues. We first provide an overview of what h
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44

Ma, Yanna, Zhenyu Wang, and Dan Wang. "The Safe Load-Bearing Capacity of Railway Tunnel Linings under High-Pressure and Water-Rich Conditions." Buildings 13, no. 9 (2023): 2154. http://dx.doi.org/10.3390/buildings13092154.

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High water pressure has been identified as the direct cause of water seepage problems in tunnels. Consequently, it is imperative to ascertain the safety load-bearing limits of tunnel linings in high-pressure, water-rich strata. In this study, FLAC3D (V5.0) numerical simulation software was employed to establish seepage models of tunnels under high-pressure, water-rich conditions, taking an actual engineering project as a reference. The hydrostatic pressure on tunnel linings under various conditions, including different permeability coefficients of the surrounding rock, grouting rings, levels o
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45

Velásquez, German, Stefano Salvi, Luc Siebenaller, Didier Béziat, and Daniel Carrizo. "Control of Shear-Zone-Induced Pressure Fluctuations on Gold Endowment: The Giant El Callao District, Guiana Shield, Venezuela." Minerals 8, no. 10 (2018): 430. http://dx.doi.org/10.3390/min8100430.

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The El Callao district, with a total endowment of more than 2000 t Au, is considered to be the most prolific gold resource in Venezuela. Mineralization is hosted by a vein system that is genetically associated with the El Callao transpressional shear zone. This vein system consists of a network of interconnected quartz–albite–ankerite veins enveloping a large number of metabasaltic fragments that host gold-bearing pyrites. Based on detailed mineralogical, microstructural, and fluid inclusion studies, a pressure-temperature pathway was established for the evolution of the mineralizing fluid dur
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46

Rebetsky, Yu L. "ON THE POSSIBLE FORMATION MECHANISM OF THE OPEN FRACTURING IN SEDIMENTARY BASINS." Geodynamics & Tectonophysics 15, no. 2 (2024): 0754. http://dx.doi.org/10.5800/gt-2024-15-2-0754.

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The paper shows that the formation of orthogonal systems of open macrofractures (cleavages) of sedimentary basins can occur at the stage of diagenesis during the first hundreds of years for a small range of shelf depths (up to 100 m) during sedimentation. During this period, sediments are compacted and the excess water is slowly squeezed out, which determines the decrease in the Poisson’s ratio from values close to 0.5 to values 0.3–0.2. Because of this, in sediments, the stress state of which is almost completely determined only by the gravity of the overlying rocks, is reduced by 50 % or mor
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Abu-Mahfouz, Israa S., Joe Cartwright, Erdem Idiz, John N. Hooker, and Stuart A. Robinson. "Silica diagenesis promotes early primary hydrocarbon migration." Geology 48, no. 5 (2020): 483–87. http://dx.doi.org/10.1130/g47023.1.

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Abstract We present evidence that hydrocarbon source rocks can be preconditioned for primary hydrocarbon migration at an early stage of catagenesis by pore-scale processes linked to silica diagenesis. The evidence comes from a detailed petrographic and geochemical study of the Jordan Oil Shale (JOS), an immature to early mature, Upper Cretaceous to Paleogene source rock developed on the platform regions of central and southern Jordan. Diagenesis of biogenic silica led to silicification of the source rock interval and the growth of chert nodules. Localization of bitumen veins in reaction rims a
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Herg, Alexandra, and Kurt Stüwe. "Tectonic interpretation of the metamorphic field gradient south of the Koralpe in the Eastern Alps." Austrian Journal of Earth Sciences 111, no. 2 (2018): 155–70. http://dx.doi.org/10.17738/ajes.2018.0010.

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AbstractIn order to constrain tectonic models for the nature of the Eoalpine high pressure belt at the eastern end of the Alps, we investigate the formation pressure of metamorphic rocks along a profile between the Koralpe and the well-known UHP rocks of the southern Pohorje mountains. Rocks from three different regions are considered: (i) the rocks of the southernmost Koralpe to the north, (ii) the rocks of the Plankogel Unit between the Plankogel detachment and the Drava valley and (iii) the rocks between the Possruck range and the southern Pohorje mountains. In the Koralpe, pelitic rocks re
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Townsend, Meredith, and Christian Huber. "A critical magma chamber size for volcanic eruptions." Geology 48, no. 5 (2020): 431–35. http://dx.doi.org/10.1130/g47045.1.

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Abstract We present a model for a coupled magma chamber–dike system to investigate the conditions required to initiate volcanic eruptions and to determine what controls the size of eruptions. The model combines the mechanics of dike propagation with internal chamber dynamics including crystallization, volatile exsolution, and the elastic response of the magma and surrounding crust to pressure changes within the chamber. We find three regimes for dike growth and eruptions: (1) below a critical magma chamber size, eruptions are suppressed because chamber pressure drops to lithostatic before a di
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Pfeffer, W. T., N. F. Humphrey, B. Amadei, J. Harper, and J. Wegmann. "In situ stress tensor measured in an Alaskan glacier." Annals of Glaciology 31 (2000): 229–35. http://dx.doi.org/10.3189/172756400781820354.

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AbstractAn experimental program at Worthington Glacier, Alaska, U.S.A., has yielded the first in situ measurement of the full stress tensor in glacier ice. Measurements were made with an array of stiff (low-compliance) normal-force sensors frozen into a borehole at 120 m depth. Freezing in temperate ice was accomplished by a down-hole heat exchanger which extracted heat at a rate of 15 W. Under slowly varying stress conditions, relaxation of stress anomalies by viscous creep following drilling of the hole and installation of the sensors allows for equilibration of measured stresses with far-fi
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