The Lithosphere

Artemieva, Irina

doi:10.1017/cbo9780511975417

Cited by 98 publications

(16 citation statements)

References 1,355 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since the downhole measured temperature at the time of drilling is lower by 10–20°C than the pre-drilling bottom-hole temperatures ( cf . Artemieva, 2011), pre-drilling temperatures were estimated using the Harrison et al . (1983) correction.…”

Section: Methodsmentioning

confidence: 99%

Clay mineral associations in the clay cap from the Cerro Pabellón blind geothermal system, Andean Cordillera, Northern Chile

et al. 2018

View full text Add to dashboard Cite

The occurrence of smectite-illite and smectite-chlorite minerals series was studied along a thick clay cap (~300 m) drilled in the Cerro Pabellón geothermal field (northern Andes, Chile). X-ray diffraction (XRD) and scanning electronic microscopy (SEM) were used to characterize the alteration mineralogy and clay mineral assemblages and their changes with depth. Cerro Pabellón is a high-enthalpy blind geothermal system, with a reservoir zone from ~500 m to 2000 m depth, with temperatures of 200–250°C. Three main hydrothermal alteration zones were identified: (1) argillic; (2) sub-propylitic, and (3) propylitic, with variable amounts of smectite, illite-smectite, chlorite-smectite, mixed-layer chlorite-corrensite, illite and chlorite appearing in the groundmass and filling amygdales and veinlets. Chemical and XRD data of smectites, I-S and illites show, with some exceptions, a progressive illitization with depth. The evolution of I-S with depth, shows a sigmoidal variation in the percentage of illite layers, with the conversion of smectite to R1 I-S at ~180–185°C. These temperatures are greater than those reported for other similar geothermal fields and might indicate, at least in part, the efficiency of the clay cap in terms of restricting the circulation of hydrothermal fluids in low-permeability rocks. Our results highlight the importance of a better understanding of clay-mineral evolution in active geothermal systems, not only as a direct (or indirect) way to control temperature evolution, but also as a control on permeability/porosity efficiency of the clay cap.

show abstract

Section: Methodsmentioning

confidence: 99%

Clay mineral associations in the clay cap from the Cerro Pabellón blind geothermal system, Andean Cordillera, Northern Chile

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Effective viscosities are cut off to not fall below 10 17 Pa•s or exceed 10 24 Pa•s, comparable to the range of typical rock viscosities (Ranali, 1997), to prevent large viscosity ranges that would lead to difficulties in solving the system of equations. The initial temperature field describes a linear geothermal gradient of 33.3 • C/km that results in a temperature of 550 • C at the base of the model (e.g., Turcotte and Schubert, 2002;Artemieva, 2011); this rather elevated thermal gradient implies steady state thermal equilibration of a mature continental crust.…”

Section: Geometrical Setupmentioning

confidence: 99%

Stretching and Contraction of Extensional Basins With Pre-Rift Salt: A Numerical Modeling Approach

et al. 2021

View full text Add to dashboard Cite

We present a series of 2D thermo-mechanical numerical experiments of thick-skinned crustal extension including a pre-rift salt horizon and subsequent thin-, thick-skinned, or mixed styles of convergence accompanied by surface processes. Extension localization along steep basement faults produces half-graben structures and leads to variations in the original distribution of pre-rift salt. Thick-skinned extension rate and salt rheology control hanging wall accommodation space as well as the locus and timing of minibasin grounding. Upon shortening, extension-related basement steps hinder forward propagation of evolving shallow thrust systems; conversely, if full basin inversion takes place along every individual fault, the regional salt layer is placed back to its pre-extensional configuration, constituting a regionally continuous décollement. Continued shortening and basement involvement deform the shallow fold-thrust structures and locally breaches the shallow décollement. We aim at obtaining a series of structural, stratigraphic and kinematic templates of fold-and-thrust belts involving rift basins with an intervening pre-rift salt horizon. Numerical results are compared to natural cases of salt-related inversion tectonics to better understand their structural evolution.

show abstract

“…It is underlain by mantle material participating in mantle convection: this rheologically weak zone is referred to as the asthenosphere (Figure 8.6). There are many contrasting definitions for the base of the lithosphere associated with different aspects of the physical properties of Earth materials (Artemieva, 2011). The situation is rendered more complex by the strong heterogeneity of the lithosphere, both laterally and vertically, and the variety of different geophysical and geochemical proxies that have been employed to define a specific lithosphere-asthenosphere boundary (LAB) rather than a rheological change.…”

Section: Transition From Lithosphere To Asthenospherementioning

confidence: 99%

The Australian Continent: A Geophysical Synthesis

Chopping¹,

Blewett²

2018

View full text Add to dashboard Cite

This synthesis of geophysical results for Australia is designed to provide an summary of the character of the Australian continent through the extensive information available at the continental scale. We present a broad range of geophysical attributes for the continent nation. We also endeavour to examine the relationships between different fields, and their relations to known resources. The work represents part of a continuing collaboration between the Research School of Earth Sciences at The Australian National University and Geoscience Australia, with the objective of bringing together all aspects of the structure of Australia in convenient forms. The results build on the extensive databases assembled at Geoscience Australia, particularly for potential fields, supplemented by the full range of seismological information mostly from The Australian National University. The book builds in part on the AuSREM project, sponsored by the AuScope infrastructure organisation, to develop a 3-D representation of seismological structure beneath the Australian region.

show abstract

The Lithosphere

Cited by 98 publications

References 1,355 publications

Clay mineral associations in the clay cap from the Cerro Pabellón blind geothermal system, Andean Cordillera, Northern Chile

Clay mineral associations in the clay cap from the Cerro Pabellón blind geothermal system, Andean Cordillera, Northern Chile

Stretching and Contraction of Extensional Basins With Pre-Rift Salt: A Numerical Modeling Approach

The Australian Continent: A Geophysical Synthesis

Contact Info

Product

Resources

About