scholarly journals The role of pre-break-up heat flow on the thermal history of a transform margin

2015 ◽  
Vol 431 (1) ◽  
pp. 249-271 ◽  
Author(s):  
M. Nemčok ◽  
A. Henk ◽  
M. Molčan
Keyword(s):  
Heat Flow ◽  
Thermal History ◽  
History Of ◽  
Break Up ◽  
Transform Margin

scholarly journals OIL AND GAS MODELING GENERARION IN THE JURASSIC SEDIMENTS IN THE SOUTH-EASTERN OF THE WEST SIBERIAN PETROLEUM PROVINSE

2021 ◽  
Vol 2 (1) ◽  
pp. 38-43
Author(s):  
Elena A. Glukhova ◽  
Pavel I. Safronov ◽  
Lev M. Burshtein
Keyword(s):  
Heat Flow ◽  
Thermal History ◽  
Oil And Gas ◽  
Flow Density ◽  
Basin Modeling ◽  
Heat Flow Density ◽  
The West ◽  
One Dimensional ◽  
History Of ◽  
The One

The article presents the one-dimensional basin modeling performed in four wells to reconstruct the thermal history of deposits and reconstruct the effective values of the heat flow density.

Heat flow and thermal history of the South China Sea

2001 ◽  
Vol 126 (3-4) ◽  
pp. 211-220 ◽  
Author(s):  
Lijuan He ◽  
Kelin Wang ◽  
Liangping Xiong ◽  
Jiyang Wang
Keyword(s):  
Heat Flow ◽  
South China Sea ◽  
South China ◽  
Thermal History ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
History Of ◽  
History Of The South

A NEW METHOD FOR ASSESSING THE THERMAL HISTORY OF SEDIMENTS: A CASE STUDY FROM THE EXMOUTH PLATEAU IN NORTHWESTERN AUSTRALIA.

1990 ◽  
Vol 30 (1) ◽  
pp. 364
Author(s):  
Robert Alexander ◽  
Roger Marzi ◽  
Robert I Kagi
Keyword(s):  
Heat Flow ◽  
Thermal History ◽  
Laboratory Studies ◽  
Molecular Processes ◽  
Sediment Column ◽  
Exmouth Plateau ◽  
History Of ◽  
Northwestern Australia ◽  
Geochemical Constraints

The Jupiter-l well on the Exmouth Plateau is presented as a case study to illustrate the use of a new molecular geochemical approach to assessing thermal history. This approach involves measuring the extent to which six independent molecular processes have occurred in a sediment column. The rates at which these molecular processes occur are well known from controlled laboratory studies; by measuring the extent to which each molecular process has occurred at a number of points in the sediment column, it is possible to identify a thermal history which is consistent with these geochemical constraints and the known geology of the sediment column. In the present study, this approach revealed that the heat flow which best accounts for present day temperatures and maturity involved a comparatively low heat flow of not more than 1.1 HFU until approximately 88 Ma before present, followed by an increase to 1.3 HFU which has continued until the present day.

Subsidence and thermal history of Queen Charlotte Basin

1983 ◽  
Vol 20 (1) ◽  
pp. 135-159 ◽  
Author(s):  
C. J. Yorath ◽  
R. D. Hyndman
Keyword(s):  
Heat Flow ◽  
Thermal History ◽  
Vitrinite Reflectance ◽  
Surface Profile ◽  
Fault System ◽  
Model Calculations ◽  
Geological Evidence ◽  
Queen Charlotte Islands ◽  
Crustal Thinning ◽  
History Of

A tectonic model for the formation, subsidence, and thermal history of Queen Charlotte Basin is developed. Based upon regional geological and geophysical data, subsidence data from offshore wells in Hecate Strait and Queen Charlotte Sound, and thermal criteria derived from present heat flow and vitrinite reflectance information, Queen Charlotte Basin is seen to have resulted from two distinct mechanisms. (1) During a period of broad regional uplift, rifting and crustal extension occurred in Queen Charlotte Sound up to about 17 Ma ago and the Queen Charlotte Islands were displaced northwards toward their present position by transcurrent motion along the Louscoone Inlet – Sandspit fault system. The rifting generated a significant thermal anomaly and a restricted deep basin as a consequence of crustal thinning and subsequent thermal cooling. (2) Beginning about 6 Ma ago, oblique underthrusting commenced along the margin, resulting in flexural uplift of the western part of the Queen Charlotte Islands and companion subsidence in Hecate Strait and Queen Charlotte Sound. The underthrusting caused rapid cooling of the old rift basins. This phase of subsidence has continued at a decreasing rate until the present.The tectonically generated subsidence in the basin has been estimated by correcting the well data for sediment compaction, paleo water depth, and sediment loading effects. At the site of the Harlequin well in the Queen Charlotte Sound rift, with the termination of extension and associated volcanism, the basin was 1500–2000 m deep and contained little sediment. Model calculations show that this depth is consistent with the estimated extension of about 70 km and a resulting crustal thinning to 8–10 km.Models for the lithosphere flexure generated by underthrusting are constrained by the geological evidence for uplift and erosion of over 5 km of material from the western portion of the Queen Charlotte Islands and the exponentially slowing subsidence to a present regional basement depth of 2 km in Hecate Strait. An excellent fit to the pre-erosion surface profile onshore and pre-Skonun basement surface offshore is obtained with a model having underthrusting on a 30° thrust at a 10 mm year−1 orthogonal component of convergence. The flexure generated by underthrusting, which is particularly well documented in the Queen Charlotte region, appears to be a feature of most subduction zones.Vitrinite reflectance data, present heat flow estimates from the wells, and thermal modelling indicate that the heat flux in Queen Charlotte Basin was much higher in the past than at present, particularly in Queen Charlotte Sound. A model is proposed with high heat flow generated by rifting prior to 17 Ma ago, followed by cooling from the underthrust oceanic lithosphere.

scholarly journals Beo v1.0: numerical model of heat flow and low-temperature thermochronology in hydrothermal systems

2019 ◽  
Vol 12 (9) ◽  
pp. 4061-4073 ◽  
Author(s):  
Elco Luijendijk
Keyword(s):  
Heat Flux ◽  
Heat Flow ◽  
Low Temperature ◽  
Thermal History ◽  
Land Surface ◽  
Hydrothermal Activity ◽  
Hydrothermal Systems ◽  
Conductive Heat ◽  
History Of ◽  
Spring Temperatures

Abstract. Low-temperature thermochronology can provide records of the thermal history of the upper crust and can be a valuable tool to quantify the history of hydrothermal systems. However, existing model codes of heat flow around hydrothermal systems do not include low-temperature thermochronometer age predictions. Here I present a new model code that simulates thermal history around hydrothermal systems on geological timescales. The modelled thermal histories are used to calculate apatite (U–Th)∕He (AHe) ages, which is a thermochronometer that is sensitive to temperatures up to 70 ∘C. The modelled AHe ages can be compared to measured values in surface outcrops or borehole samples to quantify the history of hydrothermal activity. Heat flux at the land surface is based on equations of latent and sensible heat flux, which allows more realistic land surface and spring temperatures than models that use simplified boundary conditions. Instead of simulating fully coupled fluid and heat flow, the code only simulates advective and conductive heat flow, with the rate of advective fluid flux specified by the user. This relatively simple setup is computationally efficient and allows running larger numbers of models to quantify model sensitivity and uncertainty. Example case studies demonstrate the sensitivity of hot spring temperatures to the depth, width and angle of permeable fault zones, and the effect of hydrothermal activity on AHe ages in surface outcrops and at depth.

Metamorphosed Lamprophyres and the Late Thermal History of the Moines

1966 ◽  
Vol 103 (3) ◽  
pp. 240-249 ◽  
Author(s):  
M. R. W. Johnson ◽  
I. W. D. Dalziel
Keyword(s):  
Heat Flow ◽  
Thermal Energy ◽  
Thermal History ◽  
Small Scale ◽  
History Of

AbstractCertain lamprophyres in Moidart exhibit at least three sets of minor structures (cleavages, lineations and small-scale folds). During the formation of the first set the lamprophyres acquired a schistose fabric: hornblende and biotite laths crystallized along the axial surfaces of tightly compressed folds. The deformation episodes recognized in the lamprophyre sheets post-date the main episodes of major and minor folding (F1-F3) that affected the surrounding Moine gneisses. The existence of a metamorphic fabric in these lamprophyres raises interesting problems—was the thermal energy required to “metamorphose” the lamprophyres derived from deformational heat, or by a heat flow from the Moine country rocks, or were the lamprophyres deformed during cooling and consolidation from the magmatic state (autothermal metamorphism) ?

scholarly journals Ion fractionation in young sea ice from Kongsfjorden, Svalbard

2011 ◽  
Vol 52 (57) ◽  
pp. 301-310 ◽  
Author(s):  
Sönke Maus ◽  
Susann Müller ◽  
Juliane Büttner ◽  
Sabina Brütsch ◽  
Thomas Huthwelker ◽  
...  
Keyword(s):  
Sea Ice ◽  
Thermal History ◽  
Sea Water ◽  
Arctic Sea Ice ◽  
Salt Transport ◽  
Differential Diffusion ◽  
Pore Networks ◽  
Arctic Sea ◽  
History Of

AbstractThe fractionation of major sea-water ions, or deviation in their relative concentrations from Standard Mean Ocean Water ratios, has been frequently observed in sea ice. It is generally thought to be associated with precipitation of solid salts at certain eutectic temperatures. the variability found in bulk sea-ice samples indicates that the fractionation of ions depends on the often unknown thermal history of sea ice, which affects the structure of pore networks and fate of solid salts within them. Here we investigate the distribution of ions in Arctic sea ice that is a few weeks old with a reconstructible thermal history. We separate the centrifugable (interconnected) and entrapped (likely disconnected) contributions to the ice salinity and determine their ion fractionation signatures. the results indicate that differential diffusion of ions, rather than eutectic precipitation of cryohydrates, has led to significant ion fractionation. the finding emphasizes the role of coupled diffusive–convective salt transport through complex pore networks in shaping the biogeochemistry of sea ice.

scholarly journals Modeling deuterium chemistry of interstellar space with large chemical networks

2012 ◽  
Vol 10 (H16) ◽  
pp. 624-625
Author(s):  
T. Albertsson ◽  
D. A. Semenov ◽  
A. I. Vasyunin ◽  
Th. Henning ◽  
E. Herbst
Keyword(s):  
Chemical Evolution ◽  
Thermal History ◽  
Sensitivity Study ◽  
Physical Parameters ◽  
Interstellar Space ◽  
History Of

AbstractObservations of deuterated species are essential to probing the properties and thermal history of various astrophysical environments, and the ALMA observing facilities will reveal a multitude of new deuterated molecules. To analyze these new vast data we have constructed a new up-to-date network with the largest collection of deuterium chemistry reactions to date. We assess the reliability of the network and probe the role of physical parameters and initial abundances on the chemical evolution of deuterated species. Finally, we perform a sensitivity study to assess the uncertainties in the estimated abundances and D/H ratios.

scholarly journals Beo v1.0: Numerical model of heat flow and low-temperature thermochronology in hydrothermal systems

2019 ◽  
Author(s):  
Elco Luijendijk
Keyword(s):  
Heat Flux ◽  
Heat Flow ◽  
Low Temperature ◽  
Thermal History ◽  
Land Surface ◽  
Hydrothermal Activity ◽  
Hydrothermal Systems ◽  
Conductive Heat ◽  
History Of ◽  
Spring Temperatures

Abstract. Low-temperature thermochronology can provide records of the thermal history of the upper crust and can be a valuable tool to quantify the history of hydrothermal systems. However, existing model codes of heat flow around hydrothermal systems do not include low-temperature thermochronology. Here I present a new model code that simulates thermal history around hydrothermal systems on geological timescales. The modelled thermal histories are used to calculate apatite (U-Th)/He (AHe) ages, which is a thermochronometer that is sensitive to temperatures up to 70 °C. The modelled AHe ages can be compared to measured values in surface outcrops or borehole samples to quantify the history of hydrothermal activity. Heat flux at the land surface is based on equations of latent and sensible heat flux, which allows more realistic land surface and spring temperatures than models that use simplified boundary conditions. Instead of simulating fully coupled fluid and heat flow, the code only simulates advective and conductive heat flow, with the rate of advective fluid flux specified by the user. This relatively simple setup is computationally efficient and allows running larger numbers of models to quantify model sensitivity and uncertainty. Example case studies demonstrate the sensitivity of hot spring temperatures to the depth, width and angle of permeable fault zones, and the effect of hydrothermal activity on AHe ages in surface outcrops and at depth.

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