Idaho Panhandle NF Landtypes DRAFT
... TIMBER: Timber productivity is high with potential for producing an estimated average of 110 cubic feet per acre per year under intensive management. Drier sites will be moderately to poorly productive. Tractor operation can reduce productivity by compacting, displacing or rutting surface soil. This ...
... TIMBER: Timber productivity is high with potential for producing an estimated average of 110 cubic feet per acre per year under intensive management. Drier sites will be moderately to poorly productive. Tractor operation can reduce productivity by compacting, displacing or rutting surface soil. This ...
BERYLLIUM RESOURCES IN NEW MEXICO AND ADJACENT
... Bureau of Geology and Mineral Resources standards. The content of this report should not be considered final and is subject to revision based upon new information. Any resource or reserve data are historical data and are provided for information purposes only and does not reflect Canadian National I ...
... Bureau of Geology and Mineral Resources standards. The content of this report should not be considered final and is subject to revision based upon new information. Any resource or reserve data are historical data and are provided for information purposes only and does not reflect Canadian National I ...
Understanding the Growth and Construction of Earth`s
... Plutons make up a significant volume of the Earth’s crust, and their emplacement can hydrothermally alter surrounding basement, which is often related to the genesis of ...
... Plutons make up a significant volume of the Earth’s crust, and their emplacement can hydrothermally alter surrounding basement, which is often related to the genesis of ...
Study Guide
... 4. formed when heat, pressure, or fluids act on other types of rock and affect their composition ...
... 4. formed when heat, pressure, or fluids act on other types of rock and affect their composition ...
On the origin and tectonic significance of the intra-plate
... may reflect the compressional stresses at active margins, however the others may have different origins. Within the type-region of the K’Mudku tectono thermal episode, mylonites and pseudotachylites cut across the regional granitoid and metamorphic rocks. These shear belts developed under low-to-mode ...
... may reflect the compressional stresses at active margins, however the others may have different origins. Within the type-region of the K’Mudku tectono thermal episode, mylonites and pseudotachylites cut across the regional granitoid and metamorphic rocks. These shear belts developed under low-to-mode ...
Figs 3.4 - Geoscience Australia
... mineral deposits is influenced by various rock-forming processes including enrichment in magmatic or hydrothermal fluids, separation into mineral species and precipitation, and subsequent redistribution and concentration through weathering and other surface processes. Using this evolutionary framewo ...
... mineral deposits is influenced by various rock-forming processes including enrichment in magmatic or hydrothermal fluids, separation into mineral species and precipitation, and subsequent redistribution and concentration through weathering and other surface processes. Using this evolutionary framewo ...
Bulletin 72: Mineral Deposits of Luna County, New Mexico
... Percha shale .................................................................................... 11 Mississippian ....................................................................................... 11 Lake Valley and Kelly formations .................................................. 12 Escabro ...
... Percha shale .................................................................................... 11 Mississippian ....................................................................................... 11 Lake Valley and Kelly formations .................................................. 12 Escabro ...
Crystallization sequences in the Muskox intrusion and other layered
... the influence of currents (e.g. CAMERON and DESBOROUGH, 1969). There have been various suggestions as to the mechanism of chromite enrichment--that it was concentrated by current sorting or that it was precipitated preferentially in response to changes of pressure, water content, or oxygen fugacity ...
... the influence of currents (e.g. CAMERON and DESBOROUGH, 1969). There have been various suggestions as to the mechanism of chromite enrichment--that it was concentrated by current sorting or that it was precipitated preferentially in response to changes of pressure, water content, or oxygen fugacity ...
mississippi valley-type lead-zinc deposits (mvt)
... Africa. In Canada, there are 16 districts (Fig. 2), each of which contains 2 to more than 100 deposits. The Pine Point district, for example, contains 2 deposits and more than 90 ore bodies distributed over 1,600 square kilometers. MVT deposits contributed only negligibly to Canadian Zn and Pb produ ...
... Africa. In Canada, there are 16 districts (Fig. 2), each of which contains 2 to more than 100 deposits. The Pine Point district, for example, contains 2 deposits and more than 90 ore bodies distributed over 1,600 square kilometers. MVT deposits contributed only negligibly to Canadian Zn and Pb produ ...
Tectonic history of the Chihuahua trough, Mexico
... is a genetic relationship between them and the Midcontinent rift. At about the same time as rifting, rocks of the Carrizo Mountain Group underwent their first metamorphism. At around 1,100 Ma, the region was subjected to “Grenville” diastrophism that includes extensive batholith emplacement, thrust ...
... is a genetic relationship between them and the Midcontinent rift. At about the same time as rifting, rocks of the Carrizo Mountain Group underwent their first metamorphism. At around 1,100 Ma, the region was subjected to “Grenville” diastrophism that includes extensive batholith emplacement, thrust ...
Bushnell, Kent, 1967, Geology of the Rowland Quadrangle, Elko County, Nevada: Nevada Bureau of Mines and Geology Bulletin 67, 44 p.
... Nevada, along the boundary between the Great Basin and the Snake River Plain. It lies at the intersection of the northeast-trending Paleozoic Antler orogenic belt and the east-west belt of Late Cretaceous granitic stocks and batholiths in northern Elko County. The pre-Cenozoic stratigraphy is typica ...
... Nevada, along the boundary between the Great Basin and the Snake River Plain. It lies at the intersection of the northeast-trending Paleozoic Antler orogenic belt and the east-west belt of Late Cretaceous granitic stocks and batholiths in northern Elko County. The pre-Cenozoic stratigraphy is typica ...
DOWNLOAD YOUR COURSE (handout 1).
... bubbles in the liquid - produces vesicles in volcanic rocks, responsible for explosive nature of volcanic eruptions. The composition of the gas phase varies widely in magmas reflecting the composition, T and P of formation, source material etc. SOLID PHASE: May be crystals which form early as the re ...
... bubbles in the liquid - produces vesicles in volcanic rocks, responsible for explosive nature of volcanic eruptions. The composition of the gas phase varies widely in magmas reflecting the composition, T and P of formation, source material etc. SOLID PHASE: May be crystals which form early as the re ...
The Ore Deposits of Socorro County, New Mexico
... prospects had been idle so long that workings were inaccessible, and many statements in these descriptions are based on information which could not be verified. Such information has been discriminated in the text from statements based on the writer's own observations, particularly where it has some ...
... prospects had been idle so long that workings were inaccessible, and many statements in these descriptions are based on information which could not be verified. Such information has been discriminated in the text from statements based on the writer's own observations, particularly where it has some ...
The tonalite–trondhjemite–granodiorite (TTG)
... worldwide; consequently, an understanding of their petrogenesis provides important insights into early crust-forming processes. These rocks, estimated by Martin et al. (2005) to make up around 90% of Archean-age juvenile continental crust, typically are composed of quartz, plagioclase, and biotite, ...
... worldwide; consequently, an understanding of their petrogenesis provides important insights into early crust-forming processes. These rocks, estimated by Martin et al. (2005) to make up around 90% of Archean-age juvenile continental crust, typically are composed of quartz, plagioclase, and biotite, ...
Mineral Resources in the Eastern Alps and Adjoining Areas
... The geology of Austria mainly comprises parts of the Variscan Bohemian Massif in the north, as a part of the Paleozoic Central European Variscan orogen and domains of the younger Cretaceous to Tertiary Alpine orogen in the south (Eastern and Southern Alps). Together with the Western Carpathians and ...
... The geology of Austria mainly comprises parts of the Variscan Bohemian Massif in the north, as a part of the Paleozoic Central European Variscan orogen and domains of the younger Cretaceous to Tertiary Alpine orogen in the south (Eastern and Southern Alps). Together with the Western Carpathians and ...
Differentiation of the continental crust by relamination
... recorded in some arc sections (DeBari and Sleep, 1991; Kelemen et al., 2003a), loss of these rocks still yielded a mafic arc crust very different from continental crust (DeBari and Sleep, 1991; Greene et al., 2006). This is so because garnet-free mafic rocks that are either density-stable or too visco ...
... recorded in some arc sections (DeBari and Sleep, 1991; Kelemen et al., 2003a), loss of these rocks still yielded a mafic arc crust very different from continental crust (DeBari and Sleep, 1991; Greene et al., 2006). This is so because garnet-free mafic rocks that are either density-stable or too visco ...
CHAPTER 5 Mafic-ultramafic complexes
... The Penrose definition came out of the widely accepted view that ideal oceanic crust had a uniform, layered composition. But with ongoing research, it came to be realized that the oceanic crust is not homogeneous, but variable in its development and stratigraphy, which means that ophiolites are more ...
... The Penrose definition came out of the widely accepted view that ideal oceanic crust had a uniform, layered composition. But with ongoing research, it came to be realized that the oceanic crust is not homogeneous, but variable in its development and stratigraphy, which means that ophiolites are more ...
Email addresses
... and studied directly, deep seated xenoliths from basaltic, kimberlitic and lamproitic extrusions provide important information on the petrologic and geochemical composition, rheological state, thermal evolution of the lithosphere. These xenoliths, fragments of wall rocks entrained by magmas at upper ...
... and studied directly, deep seated xenoliths from basaltic, kimberlitic and lamproitic extrusions provide important information on the petrologic and geochemical composition, rheological state, thermal evolution of the lithosphere. These xenoliths, fragments of wall rocks entrained by magmas at upper ...
Geology of Southwestern Alaska (3.0MB, PDF)
... others , 1981) and sections consisting predominantly of basinal deposits have been called the Dillinger terrane (Jones and Silberling, 1979; Jones and others , 1982). In this chapter, we do not USe the Nixon Fork and Dillinger terrane terminology; instead , we consider them together as comprising th ...
... others , 1981) and sections consisting predominantly of basinal deposits have been called the Dillinger terrane (Jones and Silberling, 1979; Jones and others , 1982). In this chapter, we do not USe the Nixon Fork and Dillinger terrane terminology; instead , we consider them together as comprising th ...
PGE DEPOSITS IN THE MARGINAL SERIES OF LAYERED
... described below. In the case of the Suhanko intrusion, the PGE grade and Cu and Ni contents of the sulfide fraction seem to correlate with the presence of the Portimo Dykes underneath the intrusion. Figure 4-7 shows a lithological log and variation of some elements in one drill core close to the dep ...
... described below. In the case of the Suhanko intrusion, the PGE grade and Cu and Ni contents of the sulfide fraction seem to correlate with the presence of the Portimo Dykes underneath the intrusion. Figure 4-7 shows a lithological log and variation of some elements in one drill core close to the dep ...
A Geology Training Manual for Grand Canyon National
... Interpretive park rangers are often educated in fields other than geology and may not feel comfortable presenting geologic information to park visitors. But at Grand Canyon, discussion of geology is important and unavoidable. There is abundant technical literature regarding Grand Canyon geology, how ...
... Interpretive park rangers are often educated in fields other than geology and may not feel comfortable presenting geologic information to park visitors. But at Grand Canyon, discussion of geology is important and unavoidable. There is abundant technical literature regarding Grand Canyon geology, how ...
Comparison of the Central Metamorphic Belt and Trinity terrane of
... Several observationsstrongly suggestthat metamorphism of the Central Metamorphic Belt took place concurrent with emplacement of the Ce.n~ralMetamorphic Belt beneath!he Trinity terrane along the Tnmty thrust: (1) peak metamorphIc temperatures and grain sizegenerally increasestructurally upward toward ...
... Several observationsstrongly suggestthat metamorphism of the Central Metamorphic Belt took place concurrent with emplacement of the Ce.n~ralMetamorphic Belt beneath!he Trinity terrane along the Tnmty thrust: (1) peak metamorphIc temperatures and grain sizegenerally increasestructurally upward toward ...
full text - NWT Protected Area Strategy
... minerals (e.g., zircon, apatite, feldspar) extracted from these samples. Most workers describe the Acasta River area (Fig. 2) as being underlain by a heterogeneous assemblage of foliated and gneissic tonalite, granodiorite, and amphibolite. Lesser volumes of gabbro, diorite, and ultramafic rocks com ...
... minerals (e.g., zircon, apatite, feldspar) extracted from these samples. Most workers describe the Acasta River area (Fig. 2) as being underlain by a heterogeneous assemblage of foliated and gneissic tonalite, granodiorite, and amphibolite. Lesser volumes of gabbro, diorite, and ultramafic rocks com ...
bedrock geology of the piedmont of delaware and adjacent
... The update of earlier work and mapping of new units is important not only to geologists, but also to hydrologists who wish to understand the distribution of water resources, to engineers who need bedrock information during construction of roads and buildings, to government officials and ...
... The update of earlier work and mapping of new units is important not only to geologists, but also to hydrologists who wish to understand the distribution of water resources, to engineers who need bedrock information during construction of roads and buildings, to government officials and ...
Lewisian, Torridonian and Moine Rocks of Scotland
... immediately above this fault were formed by high tectonic strain, rather than being well-layered sedimentary rocks. He coined the term ‘mylonite’, derived from the Greek mylon (mill), for these rocks (Lapworth, 1885); the term is still part of our modern geological vocabulary. As soon as Lapworth’s ...
... immediately above this fault were formed by high tectonic strain, rather than being well-layered sedimentary rocks. He coined the term ‘mylonite’, derived from the Greek mylon (mill), for these rocks (Lapworth, 1885); the term is still part of our modern geological vocabulary. As soon as Lapworth’s ...
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.