Hal Helgeson

Q: What Schools Are Affiliated With Hal Helgeson

Hal Helgeson is affiliated with the following schools: University of California, Berkeley, California Institute of Technology, Michigan State University, Harvard University

Hal Helgeson's AcademicInfluence.com Rankings

Hal Helgeson

Chemistry

#2371

World Rank

#3271

Historical Rank

#720

USA Rank

Geochemistry

#40

World Rank

#45

Historical Rank

#14

USA Rank

chemistry Degrees

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Chemistry

Hal Helgeson's Degrees

PhD Geochemistry California Institute of Technology

Why Is Hal Helgeson Influential?

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According to Wikipedia, Harold C. Helgeson was an American scientist and educator. A pioneering theoretical geochemist, he was a professor at the University of California, Berkeley. Early life Born in Minneapolis, Minnesota, he grew up in St. Paul. He received a B.S. in geology at Michigan State University in 1953. Helgeson went to Harvard University for graduate school, supervised by Robert M. Garrels. Helgeson received his Ph.D. in 1962.

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Hal Helgeson's Published Works

Number of citations in a given year to any of this author's works

Total number of citations to an author for the works they published in a given year. This highlights publication of the most important work(s) by the author

Published Works

SUPCRT92: a software package for calculating the standard molal thermodynamic properties of minerals, gases, aqueous species, and reactions from 1 to 5000 bar and 0 to 1000 ° C (1992) (2226)
Thermodynamics of hydrothermal systems at elevated temperatures and pressures (1969) (1460)
Theoretical prediction of the thermodynamic behavior of aqueous electrolytes by high pressures and temperatures; IV, Calculation of activity coefficients, osmotic coefficients, and apparent molal and standard and relative partial molal properties to 600 degrees C and 5kb (1981) (1450)
Calculation of the thermodynamic and transport properties of aqueous species at high pressures and temperatures: Correlation algorithms for ionic species and equation of state predictions to 5 kb and 1000°C (1988) (911)
Thermodynamic and kinetic constraints on reaction rates among minerals and aqueous solutions; I, Theoretical considerations (1982) (785)
Calculation of the thermodynamic and transport properties of aqueous species at high pressures and temperatures; revised equations of state for the standard partial molal properties of ions and electrolytes (1988) (749)
Theoretical prediction of the thermodynamic behavior of aqueous electrolytes at high pressures and temperatures (1974) (725)
Summary and critique of the thermodynamic properties of rock forming minerals (1978) (701)
Theoretical prediction of the thermodynamic behavior of aqueous electrolytes at high pressures and temperatures; I, Summary of the thermodynamic/electrostatic properties of the solvent (1974) (690)
Prediction of the thermodynamic properties of aqueous metal complexes to 1000°C and 5 kb (1997) (677)
Calculation of the thermodynamic and geochemical consequences of nonideal mixing in the system H2O-CO2-NaCl on phase relations in geologic systems: Equation of state for H2O-CO2-NaCl fluids at high pressures and temperatures (1983) (663)
Thermodynamic and kinetic constraints on reaction rates among minerals and aqueous solutions. II. Rate constants, effective surface area, and the hydrolysis of feldspar (1984) (580)
Calculation of the thermodynamic and transport properties of aqueous species at high pressures and temperatures: Standard partial molal properties of organic species (1990) (554)
Calculation of the thermodynamic properties of aqueous species at high pressures and temperatures. Effective electrostatic radii, dissociation constants and standard partial molal properties to 1000 °C and 5 kbar (1992) (426)
Calculation of the thermodynamic properties of aqueous silica and the solubility of quartz and its polymorphs at high pressures and temperatures (1977) (408)
Evaluation of irreversible reactions in geochemical processes involving minerals and aqueous solutions - I. Thermodynamic relations (1968) (371)
Evaluation of irreversible reactions in geochemical processes involving minerals and aqueous solutions—II. Applications (1969) (361)
Calculation of the thermodynamic and transport properties of aqueous species at high pressures and temperatures : Standard partial molal properties of organic species (2002) (311)
Theoretical prediction of thermodynamic properties of aqueous electrolytes at high pressures and temperatures. III. Equation of state for aqueous species at infinite dilution (1976) (280)
Petroleum, oil field waters, and authigenic mineral assemblages Are they in metastable equilibrium in hydrocarbon reservoirs☆ (1993) (261)
Calculation of mass transfer in geochemical processes involving aqueous solutions (1970) (246)
Calculation of the thermodynamic and geochemical consequences of nonideal mixing in the system H 2 O-CO 2 -NaCl on phase relations in geologic systems; metamorphic equilibria at high pressures and temperatures (1983) (230)
Kinetics of mass transfer among silicates and aqueous solutions (1971) (219)
Calculation of the thermodynamic consequences of dehydration in subducting oceanic crust to 100 kb and > 800 degrees C (1978) (204)
Thermodynamics of complex dissociation in aqueous solution at elevated temperatures (1967) (192)
Geologic and thermodynamic characteristics of the Salton Sea geothermal system (1968) (169)
Calculation of the thermodynamic and transport properties of aqueous species at high pressures and temperatures: Aqueous tracer diffusion coefficients of ions to 1000°C and 5 kb (1988) (158)
Thermodynamic and kinetic constraints on reaction rates among minerals and aqueous solutions. III. Activated complexes and the pH-dependence of the rates of feldspar, pyroxene, wollastonite, and olivine hydrolysis (1987) (147)
Triple-ion anions and polynuclear complexing in supercritical electrolyte solutions (1990) (147)
Complexing and Hydrothermal Ore Deposition. (1964) (139)
Mass transfer among minerals and hydrothermal solutions. (1979) (134)
Activity/Composition Relations among Silicates and Aqueous Solutions: II. Chemical and Thermodynamic Consequences of Ideal Mixing of Atoms on Homological Sites in Montmorillonites, Illites, and Mixed-Layer Clays (1983) (117)
Equilibrium Activity Diagrams: For Coexisting Minerals and Aqueous Solutions at Pressures and Temperatures to 5 kb and 600 °C (1987) (106)
Chemical Transport in Metasomatic Processes (1987) (104)
Chemical and thermodynamic constraints on the hydrothermal transport and deposition of tin: I. Calculation of the solubility of cassiterite at high pressures and temperatures (1985) (103)
Calculation of activity coefficients and degrees of formation of neutral ion pairs in supercritical electrolyte solutions (1991) (103)
A chemical and thermodynamic model of oil generation in hydrocarbon source rocks (2009) (102)
Summary of the Apparent Standard Partial Molal Gibbs Free Energies of Formation of Aqueous Species, Minerals, and Gases at Pressures 1 to 5000 Bars and Temperatures 25 to 1000 °C (1995) (101)
Equilibrium Activity Diagrams (1984) (101)
Chemical interaction of aqueous solutions with epidote-feldspar mineral assemblages in geologic systems; 1, Thermodynamic analysis of phase relations in the system CaO-FeO-Fe 2 O 3 -Al 2 O 3 -SiO 2 -H 2 O-CO 2 (1980) (98)
Thermodynamic and kinetic constraints on reaction rates among minerals and aqueous solutions; IV, Retrieval of rate constants and activation parameters for the hydrolysis of pyroxene, wollastonite, olivine, andalusite, quartz, and nepheline (1989) (91)
Calculation of the Standard Molal Thermodynamic Properties of Crystalline, Liquid, and Gas Organic Molecules at High Temperatures and Pressures (1998) (90)
Group additivity equations of state for calculating the standard molal thermodynamic properties of aqueous organic species at elevated temperatures and pressures. (1997) (81)
Multiple Ion Association in Supercritical Aqueous Solutions of Single Electrolytes (1993) (80)
A chemical and thermodynamic model of aluminous dioctahedral 2:1 layer clay minerals in diagenetic processes; regular solution representation of interlayer dehydration in smectite (1994) (79)
Calculation of the standard molal thermodynamic properties ofaqueous biomolecules at elevated temperatures and pressures Part1L-α-Amino acids (1997) (72)
Hydrothermal transport and deposition of gold (1968) (64)
Calculation of mass transfer among minerals and aqueous solutions as a function of time and surface area in geochemical processes. I. computational approach (1983) (63)
Calculation of the thermodynamic and transport properties of aqueous species at high pressures and temperatures: dissociation constants for supercritical alkali metal halides at temperatures from 400 to 800.degree.C and pressures from 500 to 4000 bar (1988) (62)
A chemical and thermodynamic model of dioctahedral 2:1 layer clay minerals in diagenetic processes; dehydration of dioctahedral aluminous smectite as a function of temperature and depth in sedimentary basins (1995) (56)
Calculation of the thermodynamic properties at elevated temperatures and pressures of saturated and aromatic high molecular weight solid and liquid hydrocarbons in kerogen, bitumen, petroleum, and other organic matter of biogeochemical interest (1998) (54)
Biomolecules in hydrothermal systems: Calculation of the standard molal thermodynamic properties of nucleic-acid bases, nucleosides, and nucleotides at elevated temperatures and pressures (2006) (54)
Temperature, pressure, and electrochemical constraints on protein speciation: Group additivity calculation of the standard molal thermodynamic properties of ionized unfolded proteins (2006) (53)
Handbook of theoretical activity diagrams depicting chemical equilibria in geologic systems involving an aqueous phase at one Atm and 0゜ to 300゜ C (1969) (52)
Prediction of the thermodynamic properties of electrolytes at high pressures and temperatures (1981) (46)
FORTRAN programs for generating fluid inclusion isochores and fugacity coefficients for the system H2O-CO2-NaCl at high pressures and temperatures (1985) (46)
Compositional End Members and Thermodynamic Components of Illite and Dioctahedral Aluminous Smectite Solid Solutions (1993) (46)
Thermodynamic properties of aqueous species and the solubilities of minerals at high pressures and temperatures: the system Al2O3H2OKOH (1997) (45)
Estimation of the standard molal heat capacities, entropies and volumes of 2:1 clay minerals (1994) (44)
Thermodynamic and kinetic constraints on the dissolution of feldspars (1977) (43)
Description and interpretation of metasomatic phase relations at high pressures and temperatures; 1, Equilibrium activities of ionic species in nonideal mixtures of CO 2 and H 2 O (1980) (42)
Calculation of dissociation constants and the relative stabilities of polynuclear clusters of 1:1 electrolytes in hydrothermal solutions at supercritical pressures and temperatures (1993) (42)
Interdiffusion with multiple precipitation/dissolution reactions: Transient model and the steady-state limit (1986) (40)
Chemical and thermodynamic constraints on the hydrothermal transport and deposition of tin; II, Interpretation of phase relations in the Southeast Asian tin belt (1985) (39)
Description and interpretation of phase relations in geochemical processes involving aqueous solutions (1970) (39)
Equilibrium and mass transfer during progressive metamorphism of siliceous dolomites (1983) (38)
Exact and numerical solutions to the moving boundary problem resulting from reversible heterogeneous reactions and aqueous diffusion in a porous medium (1986) (37)
Kinetics of mass transfer among silicates and aqueous solutions: Correction and clarification (1972) (36)
Organic/inorganic reactions in metamorphic processes (1991) (34)
Activity/composition relations among silicates and aqueous solutions; I, Thermodynamics of intrasite mixing and substitutional order/disorder in minerals (1985) (33)
Silicate-sea water equilibria in the ocean system (1970) (33)
Calculation of the transport properties of aqueous species at pressures to 5 KB and temperatures to 1000°C (1989) (30)
The energetics of metabolism in hydrothermal systems: Calculation of the standard molal thermodynamic properties of magnesium-complexed adenosine nucleotides and NAD and NADP at elevated temperatures and pressures (2006) (27)
Calculation of the standard partial molal thermodynamic properties of KCl0 and activity coefficients of aqueous KCl at temperatures and pressures to 1000°C and 5 kbar (1997) (27)
Effects of complex formation in flowing fluids on the hydrothermal solubilities of minerals as a function of fluid pressure and temperature in the critical and supercritical regions of the system H2O (1992) (26)
Prediction of the thermodynamic properties of aqueous metal complexes to 1000 degrees C and 5 kb. (1997) (23)
Calculation of the thermodynamic properties and relative stabilities of aqueous acetic and chloroacetic acids, acetate and chloroacetates, and acetyl and chloroacetyl chlorides at high and low temperatures and pressures (1992) (23)
Fluid flow and mineral reactions at high temperatures and pressures (1987) (22)
On the Correlation of Expandability with Mineralogy and Layering in Mixed-Layer Clays (1989) (22)
Estimation of the dielectric constant of H2O from experimental solubilities of quartz, and calculation of the thermodynamic properties of aqueous species to 900°C at 2 kb (1984) (22)
Errata II; Thermodynamics of minerals, reactions, and aqueous solutions at high pressures and temperatures (1985) (22)
Relative stabilities of biomolecules at high temperatures and pressures (1994) (19)
Metasomatic phase relations in dolomites of the Adamello Alps (1984) (15)
Erratum to Geochim. Cosmochim.: E. L. Shock and H. C. Helgeson: Cosmochimica Acta 52, pp. 2009–2036 (1989) (15)
A CHEMICAL AND THERMODYNAMIC MODEL OF ORE DEPOSITION IN HYDROTHERMAL SYSTEMS (2014) (15)
Some thermodynamic aspects of geochemistry (1985) (14)
Lagrangian and Eulerian Representations of Metasomatic Alteration of Minerals (1987) (13)
Calculation of the thermodynamic properties of aqueous silica and the solubility of quartz and its polymorphs at high pressures and temperatures; discussion and reply (1979) (13)
Surface exchange and the hydrolysis of feldspar (1989) (11)
UNIFIED DESCRIPTION OF INCONGRUENT REACTIONS AND MINERAL SOLUBILITIES AS A FUNCTION OF BULK COMPOSITION AND SOLUTION pH IN HYDROTHERMAL SYSTEMS (1991) (10)
Group additivity calculation of the standard molal thermodynamic properties of aqueous amino acids, polypeptides and unfolded proteins as a function of temperature, pressure and ionization state (2005) (10)
Solubility of petroleum in oil-field waters as a function of the oxidation state of the system (1994) (9)
Thermodynamics of minerals, reactions, and aqueous solutions at high pressures and temperatures; errata (1982) (9)
SECTION 16: IONIZATION CONSTANTS IN AQUEOUS SOLUTIONS (1966) (8)
Reaction rates in hydrothermal flow systems (1970) (7)
Phase relations among silicates, copper iron sulfides, and aqueous solutions at magmatic temperatures (1985) (6)
Kinetic and thermodynamic constraints on phase relations among minerals, petroleum, and aqueous solutions in diagenetic processes (1988) (4)
Application of Moderation Theorems to Metasomatic Processes (1987) (4)
Surfaces of reacted minerals (1987) (3)
Advective-diffusive/dispersive transport of chemically reacting species in hydrothermal systems. Final report, FY83-85 (1986) (2)
Prediction of the chemical characteristics of geothermal reservoir fluids from authigenic mineral assemblages (1977) (1)
Mineral dissolution rate control by surface reconstitution (1985) (1)
CHAPTER IV – Distribution of Species in Solution and the Controls of Hydrothermal Ore Deposition (1964) (0)
Chemical potential constraints on the composition and subcellular localization of proteins (2004) (0)
Principles of Chemical Sedimentology. Robert A. Berner (1972) (0)
Thermodynamics of the abiotic synthesis of aqueous organic species at high temperatures (1986) (0)
Thermodynamic and Geochemical Characteristics of Salton Sea Geothermal System: ABSTRACT (1968) (0)
Advective diffusive/dispersive transport in geochemical processes (1991) (0)
Calculation of the oxidative solubilities of hydrocarbon liquids in aqueous electrolyte solutions coexisting with authigenic carbonate minerals in sedimentary basins (1992) (0)
Diffusion/Dispersion Transport of Chemically Reacting Species (2014) (0)
Acceptance Speech for the 1988 V.M. Goldschmidt Award (1989) (0)
Thermodynamic and kinetic consequences of substitutional order/disorder in minerals (1981) (0)
CHAPTER II – Thermochemical Parameters of Hydrothermal Complex Formation (1964) (0)
Mineral deposition and dissolution as a function of fluid pressure in hydrothermal systems (1984) (0)
CHAPTER III – Solution Equilibria in a Portion of the System PbS-NaCl-HCl-H2O at Elevated Temperatures (1964) (0)
COMPOSITIONAL END MEMBERS A N D THERMODYNAMIC COMPONENTS OF ILLITE (2006) (0)
Phase relations in the system CHO and the generation of petroleum in hydrocarbon source rocks (2005) (0)
[Diffusion/dispersion transport of chemically reacting species]. Progress report, FY 1992--1993 (1993) (0)

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What Schools Are Affiliated With Hal Helgeson?

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