Journal ArticleDOI
Hydrologic constraints on the genesis of the Upper Mississippi Valley mineral district from Illinois Basin brines
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TLDR
In this article, the authors show that ground-water flow due to sediment compaction during basin subsidence is not responsible for mineralization in the Upper Mississippi Valley of the United States, and they also suggest that exploration strategies for Mississippi Valley type deposits should account for tectonic histories of basin margins distant from targets.Abstract:
Mississippi Valley-type deposits of the Upper Mississippi Valley mineral district probably formed during a period of regional ground-water flow across the Illinois basin initiated by uplift of the Pascola arch in post-Early Permian and pre-Late Cretaceous time. Numerical modeling of this inferred paleohydrologic regime shows that district temperatures attained by this process depend on flow rates through the basin, heat flow along flow paths, and presence of structures to cause convergence and upwelling of fluids. Predicted flow rates and timing of mineralization agree with previous estimates. Modeling results also offer explanations of banding in district mineralization and district silicification patterns. Modeling of ground-water flow due to sediment compaction during basin subsidence, however, shows that this process was not responsible for mineralization. Fluids displaced from the deep basin by compaction-driven flow moved too slowly to avoid conductive cooling to the surface before reaching the district. Episodic dewatering events are unlikely to have occurred, because the basin did not develop significant overpressures during subsidence. Results of the compaction-driven flow modeling probably also apply to the Michigan and Forest City basins. Study results suggest that exploration strategies for Mississippi Valley-type deposits should account for tectonic histories of basin margins distant from targets.read more
Citations
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Heat as a ground water tracer.
TL;DR: Ground water temperature data and associated analytical tools are currently underused and have not yet realized their full potential, according to this review paper.
Journal ArticleDOI
How permeable are clays and shales
TL;DR: In this paper, a regular relation between permeability and porosity in clays and shales and permeabilities that, even at large scales, are significantly lower than usually assumed.
Journal ArticleDOI
Crustal stress, faulting and fluid flow
TL;DR: In the vicinity of active faults that undergo intermittent rupturing, permeability and fluid flux may be tied to the earthquake cycle through a range of mechanisms, leading to complex interactions between stress cycling, the creation and destruction of permeability, and fluid flow as discussed by the authors.
Journal ArticleDOI
Brine Migrations Across North America-The Plate Tectonics of Groundwater
Craig M. Bethke,Stephen Marshak +1 more
TL;DR: In this paper, the authors describe the evidence that brine migrations occurred as giant hydrothermal systems operating on regional scales, paying greatest attention to the Ouachita-Arkoma belt and the neighboring area of the midcontinent to the north (parts of Arkansas, Missouri, Oklahoma, Iowa, and Kansas).
Journal ArticleDOI
Quartz cement in sandstones: a review
TL;DR: The main factors that control the amount of quartz cement in sandstones are: framework composition, residence time in the silica mobility window, and fluid composition, flow volume and pathways.
References
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Book
Fundamentals of rock mechanics
John Conrad Jaeger,N. G. W. Cook +1 more
TL;DR: In this article, Mecanique des roches and Analyse des contraintes were used to construct Elasticite Reference Record (ER) and Elasticite reference record (ER).
Journal ArticleDOI
Continental stretching: An explanation of the Post-Mid-Cretaceous subsidence of the central North Sea Basin
TL;DR: In this article, the authors examined the thermal maturity and hydrocarbon potential of certain sedimentary horizons in the northern section of the Central Graben and found that most of this subsidence results from the thermal relaxation of the lithosphere which was thinned during a Middle Jurassic to mid-Cretaceous stretching of the crust.
Journal ArticleDOI
Clay Diagenesis in Wilcox Sandstones of Southwest Texas: Implications of Smectite Diagenesis on Sandstone Cementation
James R. Boles,Stephen G. Franks +1 more
TL;DR: In this paper, a diagenetic model is proposed which involves the breakdown of detrital K-feldspar and of some smectite layers in illite/smectite to convert other smectitite layers to illite.
Journal ArticleDOI
Estimation of underground temperatures from the silica content of water from hot springs and wet-steam wells
R. O. Fournier,J. J. Rowe +1 more
TL;DR: In this article, the authors used the silica content of boiling water discharged at the surface to estimate underground temperature of last equilibrium with quartz, provided correction is made for steam forming during solution ascent.
Journal ArticleDOI
The origin of saline formation waters: 1. Isotopic composition
TL;DR: The content of total dissolved solids and δD and O18 values were given for 95 oil-field brines from the Illinois, Michigan, and Alberta basins and the Gulf Coast as discussed by the authors.
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