Orogenic Belts and Orogenic Sediment Provenance
... orogen is envisaged here as the tectonic assembly of subparallel geological domains consisting of genetically associated rock complexes. Five types of such elongated orogenic domains are identified as the primary building blocks of composite orogens: magmatic arcs, obducted or accreted ophiolites, n ...
... orogen is envisaged here as the tectonic assembly of subparallel geological domains consisting of genetically associated rock complexes. Five types of such elongated orogenic domains are identified as the primary building blocks of composite orogens: magmatic arcs, obducted or accreted ophiolites, n ...
Mountain building and mantle dynamics
... [Ghosh et al., 2006]. The third potential driving force is related to the arrival of mantle plumes at the base of the lithosphere. Thermal upwellings can lead to increased driving tractions and a reduction of asthenosphere viscosity, facilitating lithospheric motions [e.g., van Hinsbergen et al., 20 ...
... [Ghosh et al., 2006]. The third potential driving force is related to the arrival of mantle plumes at the base of the lithosphere. Thermal upwellings can lead to increased driving tractions and a reduction of asthenosphere viscosity, facilitating lithospheric motions [e.g., van Hinsbergen et al., 20 ...
Evolution of the Paleo-Asian Ocean (Altai−Sayan Region, Central
... phengite ages are 540±24 and 576±11 Ma (schists from serpentinitic melange). The K−Ar amphibole age of the garnet amphibolite (Chagan−Uzun massif) is 535± −24 Ma and Ar−Ar amphibole ages from the eclogitic part are 636± 10 Ma and 627± Ma. The K−Ar amphibole age of island-arc ophiolites is 523±23 Ma. ...
... phengite ages are 540±24 and 576±11 Ma (schists from serpentinitic melange). The K−Ar amphibole age of the garnet amphibolite (Chagan−Uzun massif) is 535± −24 Ma and Ar−Ar amphibole ages from the eclogitic part are 636± 10 Ma and 627± Ma. The K−Ar amphibole age of island-arc ophiolites is 523±23 Ma. ...
Mountain building and mantle dynamics
... [Ghosh et al., 2006]. The third potential driving force is related to the arrival of mantle plumes at the base of the lithosphere. Thermal upwellings can lead to increased driving tractions and a reduction of asthenosphere viscosity, facilitating lithospheric motions [e.g., van Hinsbergen et al., 20 ...
... [Ghosh et al., 2006]. The third potential driving force is related to the arrival of mantle plumes at the base of the lithosphere. Thermal upwellings can lead to increased driving tractions and a reduction of asthenosphere viscosity, facilitating lithospheric motions [e.g., van Hinsbergen et al., 20 ...
Geological Society of America Bulletin - UCLA
... JOHN F. DUNN Chevron Overseas Petroleum Inc., c/o Bolivia Pouch Mail, P.O. Box 5046, San Ramon, California 94583 ...
... JOHN F. DUNN Chevron Overseas Petroleum Inc., c/o Bolivia Pouch Mail, P.O. Box 5046, San Ramon, California 94583 ...
BGS Report, single column layout
... To ensure that full definitions of the lithostratigraphical units are held in the webaccessible BGS Lexicon of named rock units for the areas of responsibility covered by the SFC. ...
... To ensure that full definitions of the lithostratigraphical units are held in the webaccessible BGS Lexicon of named rock units for the areas of responsibility covered by the SFC. ...
The Development of Highly Strained Rocks in the Pelican Window
... The fine grain-size, as already shown, is an inconclusive factor, explainable by dynamic recrystallization under high strain. The calc-silicates occur as lenses or boudin trains locally extending for several metres along strike. These may be interpreted as boudinaged sedimentary layers, implying tha ...
... The fine grain-size, as already shown, is an inconclusive factor, explainable by dynamic recrystallization under high strain. The calc-silicates occur as lenses or boudin trains locally extending for several metres along strike. These may be interpreted as boudinaged sedimentary layers, implying tha ...
Sublayer and Offset Dikes of the Sudbury Igneous
... Supplementing existing data with new measurements made along most of the Lithoprobe transect lines, McGrath and Broome (1994) have re-interpreted the gravity map of the Sudbury structure. They conclude that the sub-surface disposition of rock-types that are exposed at surface, as revealed in the sei ...
... Supplementing existing data with new measurements made along most of the Lithoprobe transect lines, McGrath and Broome (1994) have re-interpreted the gravity map of the Sudbury structure. They conclude that the sub-surface disposition of rock-types that are exposed at surface, as revealed in the sei ...
︎PDF - Fabio Crameri
... emerging mobile surface plates in mantle convection simulations, is a long-standing challenge. The majority of mantle convection models featuring a mobile lid thus impose some aspect such as plate velocity, trench velocity, or weak zones [see Bercovici et al., 2000; Lowman, 2011, and references ther ...
... emerging mobile surface plates in mantle convection simulations, is a long-standing challenge. The majority of mantle convection models featuring a mobile lid thus impose some aspect such as plate velocity, trench velocity, or weak zones [see Bercovici et al., 2000; Lowman, 2011, and references ther ...
Towards a Creationist Explanation of Regional
... the mountainous western parts of the United States and Canada. Metamorphic rocks also are widely exposed in other parts of the world such as Australia, Scandinavia, Siberia, and India. ...
... the mountainous western parts of the United States and Canada. Metamorphic rocks also are widely exposed in other parts of the world such as Australia, Scandinavia, Siberia, and India. ...
Mantle Meltıng Beneath Mıd-Ocean rıdges
... temperature range of several hundred degrees. The boundary between melt absent and melt present is called the mantle solidus. As mantle ascends beneath the ocean ridge, it begins melting as the solidus is crossed, and melts progressively during further ascent. Thus, the mantle melts by pressure decr ...
... temperature range of several hundred degrees. The boundary between melt absent and melt present is called the mantle solidus. As mantle ascends beneath the ocean ridge, it begins melting as the solidus is crossed, and melts progressively during further ascent. Thus, the mantle melts by pressure decr ...
The anatomy and ontogeny of modern intra
... crust (Fig. 1). IOASs are widely acknowledged as sites where thickened welts of juvenile (i.e. derived from melting of the mantle) crust is produced. In spite of this significance, IOASs are significantly less well studied than Andean-type arcs. The main reason for this is that the vast bulk of IOAS ...
... crust (Fig. 1). IOASs are widely acknowledged as sites where thickened welts of juvenile (i.e. derived from melting of the mantle) crust is produced. In spite of this significance, IOASs are significantly less well studied than Andean-type arcs. The main reason for this is that the vast bulk of IOAS ...
Mantle-driven deformation of orogenic zones and clutch tectonics
... bottom-driven mantle flow, are proposed for obliquely convergent, transcurrent and obliquely divergent plate margins. Our analysis indicates that the absolute, and not just relative, plate motions play a critical role in the orogenic cycle. ...
... bottom-driven mantle flow, are proposed for obliquely convergent, transcurrent and obliquely divergent plate margins. Our analysis indicates that the absolute, and not just relative, plate motions play a critical role in the orogenic cycle. ...
GEOLOGICAL SURVEY OF FINLAND Special Paper 48 2008 GTK
... investments promotion as well as sustainable social and economic development. The availability of basic geological information is an important parameter in promoting investments as well as an essential tool for planning the construction of infrastructure and for predicting natural disasters. The GTK ...
... investments promotion as well as sustainable social and economic development. The availability of basic geological information is an important parameter in promoting investments as well as an essential tool for planning the construction of infrastructure and for predicting natural disasters. The GTK ...
Chapter 17. The Other Isotopes
... not known or not treated. This introduces a hazard into statistical treatments and mixing calculations involving ratios. Ratios cannot be treated as pure numbers or absolute concentrations. The means and variances of isotopic ratios are meaningless unless all the samples have the same concentrations ...
... not known or not treated. This introduces a hazard into statistical treatments and mixing calculations involving ratios. Ratios cannot be treated as pure numbers or absolute concentrations. The means and variances of isotopic ratios are meaningless unless all the samples have the same concentrations ...
The East African rift system - Department of Earth and Planetary
... structural geologist who, since 1979, has been carrying out fieldwork and remote sensing analysis along the entire 6000 km north–south stretch of the rift, and has been almost everywhere. The history of geological researches dedicated to the East African rift system (EARS) comprises several steps. Af ...
... structural geologist who, since 1979, has been carrying out fieldwork and remote sensing analysis along the entire 6000 km north–south stretch of the rift, and has been almost everywhere. The history of geological researches dedicated to the East African rift system (EARS) comprises several steps. Af ...
compositional and thermal differences between lithospheric and
... asthenosphere and the cold thickened lithospheric mantle. Generally, standard delamination models have neglected density changes within the crust and the lithospheric mantle, which occur due to phase transitions and compositional variations upon changes of P-T parameters. Our attention is focused on ...
... asthenosphere and the cold thickened lithospheric mantle. Generally, standard delamination models have neglected density changes within the crust and the lithospheric mantle, which occur due to phase transitions and compositional variations upon changes of P-T parameters. Our attention is focused on ...
Full text PDF - Geochemical Perspectives
... and Ted Ringwood in 1957 and 1958, respectively) and Paul Gast’s 1960 paper “Limitations on the Composition of the Upper Mantle”, which is where my narrative begins. Unfortunately, I never had the opportunity to meet Paul Gast. I was sitting in Jean-Guy Schilling’s office when he got a call informin ...
... and Ted Ringwood in 1957 and 1958, respectively) and Paul Gast’s 1960 paper “Limitations on the Composition of the Upper Mantle”, which is where my narrative begins. Unfortunately, I never had the opportunity to meet Paul Gast. I was sitting in Jean-Guy Schilling’s office when he got a call informin ...
Mantle mixing - Earth and Environmental Sciences
... Convective flows provide a mechanism for stirring and mixing of heterogeneities. The principle components of this process are stretching, folding, breakup, and diffusion (Ottino, 1989). Stretching and folding are illustrated in Figure 1. Stretching occurs in the presence of velocity gradients (such ...
... Convective flows provide a mechanism for stirring and mixing of heterogeneities. The principle components of this process are stretching, folding, breakup, and diffusion (Ottino, 1989). Stretching and folding are illustrated in Figure 1. Stretching occurs in the presence of velocity gradients (such ...
- Wiley Online Library
... rifting [e.g., Moulin et al., 2005]. [4] The factors that control the amount of melt produced at magma-poor margins, either by decompressional melting during crustal thinning [e.g., Minshull, 2002] or postrift thermal anomaly [e.g., Lucazeau et al., 2009], are yet to be understood. Especially, it is ...
... rifting [e.g., Moulin et al., 2005]. [4] The factors that control the amount of melt produced at magma-poor margins, either by decompressional melting during crustal thinning [e.g., Minshull, 2002] or postrift thermal anomaly [e.g., Lucazeau et al., 2009], are yet to be understood. Especially, it is ...
History of geology
The history of geology is concerned with the development of the natural science of geology. Geology is the scientific study of the origin, history, and structure of the Earth. Throughout the ages geology provides essential theories and data that shape how society conceptualizes the Earth.