Sm Nd AND U Pb ISOTOPIC STUDY OF THE NYASYUKKA DIKE
... Smolkin [1993], Fedotov [1995], and Borisova [1989], Fig. 3 was constructed, displaying major components plotted against MgO. The samples are divided into the following five groups marked with their own symbols: peridotites, olivine gabbros, and Ti?rich peridotites from the Nyasyukka area, pyroxenit ...
... Smolkin [1993], Fedotov [1995], and Borisova [1989], Fig. 3 was constructed, displaying major components plotted against MgO. The samples are divided into the following five groups marked with their own symbols: peridotites, olivine gabbros, and Ti?rich peridotites from the Nyasyukka area, pyroxenit ...
Geochronology, Geology, and Listric Normal Faulting of the Vulture
... a coarse-grained, porphyritic granite is found in scattered outcrops between alluvial cover. A similar granite occurs to the south between the Vulture and Caballeros Peaks. This rock Is mesoscopically similar to Precambrian granites in adjacent areas. Tertiary volcanic rocks rest depositionally on t ...
... a coarse-grained, porphyritic granite is found in scattered outcrops between alluvial cover. A similar granite occurs to the south between the Vulture and Caballeros Peaks. This rock Is mesoscopically similar to Precambrian granites in adjacent areas. Tertiary volcanic rocks rest depositionally on t ...
Remobilization of granitoid rocks through mafic recharge: evidence
... in length from less than 2 mm (below which they become difficult to distinguish from phenocrysts) to 130 cm, and their length distribution follows a negative power law (Fig. 3a). Figure 3b shows the variation of enclave width with length. Whereas there are a few equant enclaves, most enclaves are el ...
... in length from less than 2 mm (below which they become difficult to distinguish from phenocrysts) to 130 cm, and their length distribution follows a negative power law (Fig. 3a). Figure 3b shows the variation of enclave width with length. Whereas there are a few equant enclaves, most enclaves are el ...
Volcanism of the Palaeoproterozoic Bushveld Large Igneous Province: the Rooiberg
... for which emplacement was preceded by the extrusion of the vast Rooiberg lava flows in the northern part of the Kaapvaal Craton. Like many silicic-dominated Large Igneous Provinces (LIPs), which are increasingly recognised in the rock record, the Rooiberg Group volcanics are intracontinental, subaer ...
... for which emplacement was preceded by the extrusion of the vast Rooiberg lava flows in the northern part of the Kaapvaal Craton. Like many silicic-dominated Large Igneous Provinces (LIPs), which are increasingly recognised in the rock record, the Rooiberg Group volcanics are intracontinental, subaer ...
The Neoarchaean Storø Supracrustal Belt, Nuuk
... class in parenthesis after each rock type throughout this paper. We would like to emphasise that this ...
... class in parenthesis after each rock type throughout this paper. We would like to emphasise that this ...
Stratigraphy, structure and regional correlations of crustal
... Figure 3. Schematic model for structural evolution of Laurentian margin in southern Quebec. Figure 4. Geological map showing the location of major ophiolites and the inferred distribution of the various facies of the Saint-Daniel Mélange in the southern Québec Appalachians. Figure 5. A) Inferred reg ...
... Figure 3. Schematic model for structural evolution of Laurentian margin in southern Quebec. Figure 4. Geological map showing the location of major ophiolites and the inferred distribution of the various facies of the Saint-Daniel Mélange in the southern Québec Appalachians. Figure 5. A) Inferred reg ...
Physical Geography
... of water alter the landscape. As waterways such as rivers flow, they often carry sediment, which reduces the land around the river itself but increases areas where this sediment is released. Water from rain and flash floods can also be responsible for erosion, which physically alters rocks and other ...
... of water alter the landscape. As waterways such as rivers flow, they often carry sediment, which reduces the land around the river itself but increases areas where this sediment is released. Water from rain and flash floods can also be responsible for erosion, which physically alters rocks and other ...
The Geological Heritage of Fingal
... our material goods are derived from Earth resources, extracted from the ground. The Earth also offers hazards and risks with earthquakes, volcanic eruptions, landslides, flooding, tsunami and storms. Understanding the Earth System and our impact upon it is vital to the sustainability of human cultur ...
... our material goods are derived from Earth resources, extracted from the ground. The Earth also offers hazards and risks with earthquakes, volcanic eruptions, landslides, flooding, tsunami and storms. Understanding the Earth System and our impact upon it is vital to the sustainability of human cultur ...
Field Trip Guide
... section about 650 meters (~2000 feet) into the Lower Cambrian Dunham Formation (well exposed at Lone Rock Point just north of Burlington—our Stop 1) (Stanley, 1987). Between the Burlington and the Quebec border, this thrust generally follows the base of the Dunham Formation and then becomes the Rose ...
... section about 650 meters (~2000 feet) into the Lower Cambrian Dunham Formation (well exposed at Lone Rock Point just north of Burlington—our Stop 1) (Stanley, 1987). Between the Burlington and the Quebec border, this thrust generally follows the base of the Dunham Formation and then becomes the Rose ...
Pliocene lahar deposits in the Coastal Cordillera of central Chile
... between Colón and Coya (Fig. 1), where their present volume has been estimated at 7.3 km3 (Gómez, 2001). In addition, similar deposits occur scattered along the westernmost section of the Main Andean Cordillera between 338 and 348S (SERNAGEOMIN, 2002) and within sections of the Intermediate Depres ...
... between Colón and Coya (Fig. 1), where their present volume has been estimated at 7.3 km3 (Gómez, 2001). In addition, similar deposits occur scattered along the westernmost section of the Main Andean Cordillera between 338 and 348S (SERNAGEOMIN, 2002) and within sections of the Intermediate Depres ...
BW02 - Ispra
... sharply defined, amoeboid patches which occupy from 30% to 50% by volume of the rock. The melilitite fragments often display ‘cauli≠flower’ shapes and appear to be in the process of disintegration. The matrix to the melilitite fragments consists dominantly ...
... sharply defined, amoeboid patches which occupy from 30% to 50% by volume of the rock. The melilitite fragments often display ‘cauli≠flower’ shapes and appear to be in the process of disintegration. The matrix to the melilitite fragments consists dominantly ...
DaVince Tools Generated PDF File
... LARAMIDE AND NEOGENE STRUCTURE mide time, and 2- those that consist of upper Paleozoic sedimentary rocks and a veneer of Mesozoic sedimentary rocks that were compressed between the two uplifts (Fig. 2). An autochthonous terrane of upper Paleozoic sedimentary rocks lies between the thrusted terranes. ...
... LARAMIDE AND NEOGENE STRUCTURE mide time, and 2- those that consist of upper Paleozoic sedimentary rocks and a veneer of Mesozoic sedimentary rocks that were compressed between the two uplifts (Fig. 2). An autochthonous terrane of upper Paleozoic sedimentary rocks lies between the thrusted terranes. ...
Mineral Deposit Research: Meeting the Global Challenge
... The north-south difference of numbers of deposits for each sub-region is also shown on the Figure 2. The western region has a maximum number of deposits at around 48° N, similar to the trend to all of Northeast Asia. However, the number steeply decreases to the south. The central region shows two pe ...
... The north-south difference of numbers of deposits for each sub-region is also shown on the Figure 2. The western region has a maximum number of deposits at around 48° N, similar to the trend to all of Northeast Asia. However, the number steeply decreases to the south. The central region shows two pe ...
Pennsylvanian Rocks of the Mogollon Rim Area, Arizona
... northwestern Arizona. Regional tectonics of the Mogollon "slope" were discussed by Kelley and Clinton (1960). South of Jerome, McNair (1951) measured more than 300 feet (the top an erosion surface) of lower Supai red beds unconformable on the Redwall Limestone . Similarly, Anderson and Creasey (1958 ...
... northwestern Arizona. Regional tectonics of the Mogollon "slope" were discussed by Kelley and Clinton (1960). South of Jerome, McNair (1951) measured more than 300 feet (the top an erosion surface) of lower Supai red beds unconformable on the Redwall Limestone . Similarly, Anderson and Creasey (1958 ...
THE SOIL CLAYS OF GREAT BRITAIN: II. SCOTLAND
... clay mineralogy where the soils are developed directly on this material but could influence the soil clays on a much wider scale than is generally appreciated. Thus, that part of the ancient weathering cover that was removed by glacial erosion must, to some extent, have been incorporated into the gl ...
... clay mineralogy where the soils are developed directly on this material but could influence the soil clays on a much wider scale than is generally appreciated. Thus, that part of the ancient weathering cover that was removed by glacial erosion must, to some extent, have been incorporated into the gl ...
(VMS) Deposits - Department of Natural Resources
... olcanogenic massive sulphide (VMS) deposits are one of the most common families of mineral deposits on earth. They consist of irregularly-shaped, tabular bodies of nearly 100% sulphides within volcanic host rocks. Pyrite is generally the most abundant sulphide, though many non-Newfoundland deposits ...
... olcanogenic massive sulphide (VMS) deposits are one of the most common families of mineral deposits on earth. They consist of irregularly-shaped, tabular bodies of nearly 100% sulphides within volcanic host rocks. Pyrite is generally the most abundant sulphide, though many non-Newfoundland deposits ...
Open-file Report 486: Geology and mineral resources of the Wild
... Lindgren (1933) defined the term "epithermal" to include a broad range of deposits that formed by ascending waters at shallow to moderate depths (<4,500 ft), low to moderate temperatures (50°–200°C), which are typically associated with intrusive and/or volcanic rocks. It is now generally accepted th ...
... Lindgren (1933) defined the term "epithermal" to include a broad range of deposits that formed by ascending waters at shallow to moderate depths (<4,500 ft), low to moderate temperatures (50°–200°C), which are typically associated with intrusive and/or volcanic rocks. It is now generally accepted th ...
BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA
... paleochemistry of sea water and atmosphere. Several less conclusive lines of evidence now available suggest that the composition of both sea water and atmosphere may have varied somewhat during the past; but the geologic record indicates that these variations have probably been within relatively nar ...
... paleochemistry of sea water and atmosphere. Several less conclusive lines of evidence now available suggest that the composition of both sea water and atmosphere may have varied somewhat during the past; but the geologic record indicates that these variations have probably been within relatively nar ...
- International Association of Geomorphologists
... Backshore The area of a beach extending from the limit of high water foam lines to dunes or extreme inland limit of the beach. It is only affected by waves during exceptional high tides or severe storms Backswamp The section of a floodplain where deposits of fine silts and clays settle after a floo ...
... Backshore The area of a beach extending from the limit of high water foam lines to dunes or extreme inland limit of the beach. It is only affected by waves during exceptional high tides or severe storms Backswamp The section of a floodplain where deposits of fine silts and clays settle after a floo ...
Learning Outcome mapping of old spec to new
... and isostasy provides indirect evidence to determine the behaviour of the lithosphere and asthenosphere the layered structures of the Earth as defined by the rheological properties of the layers the geochemical layered structure of the Earth as defined by the mineral composition of the layers and ho ...
... and isostasy provides indirect evidence to determine the behaviour of the lithosphere and asthenosphere the layered structures of the Earth as defined by the rheological properties of the layers the geochemical layered structure of the Earth as defined by the mineral composition of the layers and ho ...
Generation of high-silica rhyolite: A Nd, Sr, and O isotopic study of
... all erupted within a period shorter than 5-10 ky. About 75 ky ago, a new group of ring domes (e.g., Sample 174) erupted at the southern margin of the lake. Subsequent uplift due to magmatic insurgence caused the lake to drain and culminated about 60 ky ago in eruption of aphyric lavas (e.g., Sample ...
... all erupted within a period shorter than 5-10 ky. About 75 ky ago, a new group of ring domes (e.g., Sample 174) erupted at the southern margin of the lake. Subsequent uplift due to magmatic insurgence caused the lake to drain and culminated about 60 ky ago in eruption of aphyric lavas (e.g., Sample ...
- CSUN ScholarWorks - California State University
... during deformation, that are experimentally determined in the laboratory for single phase or polyphase aggregates designed to imitate the composition of continental crust. However, it remains a subject of debate whether or not flow laws accurately describe the behavior of naturally-deformed contine ...
... during deformation, that are experimentally determined in the laboratory for single phase or polyphase aggregates designed to imitate the composition of continental crust. However, it remains a subject of debate whether or not flow laws accurately describe the behavior of naturally-deformed contine ...
Clastic rock
Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus, chunks and smaller grains of rock broken off other rocks by physical weathering. Geologists use the term clastic with reference to sedimentary rocks as well as to particles in sediment transport whether in suspension or as bed load, and in sediment deposits.