Characteristics and Petrogenesis of Alaskan-Type Ultramafic
... serpentinization, however, does indicate that they were rich in olivine. We do discuss the ultramafic complex at Red Bluff Bay (Loney and others, 1975) here with the Alaskan-type bodies; however, as pointed out below, inclusion of it as an Alaskan-type complex remains questionable. This study descri ...
... serpentinization, however, does indicate that they were rich in olivine. We do discuss the ultramafic complex at Red Bluff Bay (Loney and others, 1975) here with the Alaskan-type bodies; however, as pointed out below, inclusion of it as an Alaskan-type complex remains questionable. This study descri ...
Test - Weebly
... 3. What kind of twinning does this mineral possess most commonly? a. Carlsbad b. Manebach c. Baveno 4. In Ancient Greek, the name of this mineral translates to what? ______________________________ 5. This mineral is most commonly found as a constituent in what kinds of rocks? a. Sedimentary b. High- ...
... 3. What kind of twinning does this mineral possess most commonly? a. Carlsbad b. Manebach c. Baveno 4. In Ancient Greek, the name of this mineral translates to what? ______________________________ 5. This mineral is most commonly found as a constituent in what kinds of rocks? a. Sedimentary b. High- ...
Sea¯oor hydrothermal alteration at an Archaean mid
... A hydrothermally metamorphosed/altered greenstone complex capped by bedded cherts exposed in the North Pole, Pilbara Carton, Western Australia, is interpreted as an accretionary complex. It is distinctive in being characterised by both duplex structure and an oceanic crust stratigraphy. This complex ...
... A hydrothermally metamorphosed/altered greenstone complex capped by bedded cherts exposed in the North Pole, Pilbara Carton, Western Australia, is interpreted as an accretionary complex. It is distinctive in being characterised by both duplex structure and an oceanic crust stratigraphy. This complex ...
Chromite - NSW Resources and Energy
... all world production coming from such deposits. Podiform and vein deposits tend to be smaller than the cumulate type, and are less important commercially. South Africa accounts for 46% of world production. Only minor production of chromite, from small podiform deposits, has occurred in Australia. Al ...
... all world production coming from such deposits. Podiform and vein deposits tend to be smaller than the cumulate type, and are less important commercially. South Africa accounts for 46% of world production. Only minor production of chromite, from small podiform deposits, has occurred in Australia. Al ...
163f71 • BUREAU OF MINERAL RESOURCES GEOLOGY AND
... This was folloWed by Lawrence (1956), and Lang (19501). Palaeontological reports have been written by Whitehouse (1925i 1939), and Dickins (1961), and palaeobotanical reports by M.E. White (1962 and 19634"/0. ^The Bureau of Mineril Resources in conjunction with the , 'Geological Survey of Queensland ...
... This was folloWed by Lawrence (1956), and Lang (19501). Palaeontological reports have been written by Whitehouse (1925i 1939), and Dickins (1961), and palaeobotanical reports by M.E. White (1962 and 19634"/0. ^The Bureau of Mineril Resources in conjunction with the , 'Geological Survey of Queensland ...
View
... andesite compositional range, 'intermediate' is equivalent to the basaltic andesite - andesite compositional range, and 'felsic' is equivalent to the dacite - rhyolite compositional range. These terms are generally used where the precise composition of the rock is unknown (e.g. for breccias and tuff ...
... andesite compositional range, 'intermediate' is equivalent to the basaltic andesite - andesite compositional range, and 'felsic' is equivalent to the dacite - rhyolite compositional range. These terms are generally used where the precise composition of the rock is unknown (e.g. for breccias and tuff ...
Carbonate Facies and Sedimentation of the Klapanunggal
... breccia facies. By referring to the characteristics of those facies, their depositional environments can be interpreted (Wilson, 1975; Flugel, 2004). The distribution of Klapanunggal carbonate facies including interpretation of depositional environment are presented in Figure 7. The Boundstone Facie ...
... breccia facies. By referring to the characteristics of those facies, their depositional environments can be interpreted (Wilson, 1975; Flugel, 2004). The distribution of Klapanunggal carbonate facies including interpretation of depositional environment are presented in Figure 7. The Boundstone Facie ...
The Russian Far East is a territory where young geological
... ore districts, deposits, and isolated ore bodies has been established. We have first argued an idea, according to which the available lateral (from west to east) magmatic and metallogenic zoning is vertical (upwards) based on temperature and geochronological zoning. It is demonstrated by an oblique ...
... ore districts, deposits, and isolated ore bodies has been established. We have first argued an idea, according to which the available lateral (from west to east) magmatic and metallogenic zoning is vertical (upwards) based on temperature and geochronological zoning. It is demonstrated by an oblique ...
Types of Metamorphism
... fault zone (exposed by erosion) with some ductile flow and fault mylonite Figure 21-7. Schematic cross section across fault zones. After Mason (1978) Petrology of the Metamorphic Rocks. George Allen & Unwin. London. ...
... fault zone (exposed by erosion) with some ductile flow and fault mylonite Figure 21-7. Schematic cross section across fault zones. After Mason (1978) Petrology of the Metamorphic Rocks. George Allen & Unwin. London. ...
2. Geophysics and the Structure of the Lesser Antilles Forearc
... The subduction zone of the Lesser Antilles forms the eastern boundary of the Caribbean Plate, where Atlantic oceanic lithosphere of the North and South American plates passes beneath it. The predominantly easterly direction of plate convergence at the boundary has been inferred primarily from the no ...
... The subduction zone of the Lesser Antilles forms the eastern boundary of the Caribbean Plate, where Atlantic oceanic lithosphere of the North and South American plates passes beneath it. The predominantly easterly direction of plate convergence at the boundary has been inferred primarily from the no ...
Bedrock geology in New England submarine canyons
... Using the research submersible "Alvin" we explored three deeply submerged canyons along the New England segment of the North American margin. Contemporary submarine erosion in canyon axes provides almost continuous outcrop of Mesozoic and Cenozoic strata. The oldest strata sampled belong to a Neocom ...
... Using the research submersible "Alvin" we explored three deeply submerged canyons along the New England segment of the North American margin. Contemporary submarine erosion in canyon axes provides almost continuous outcrop of Mesozoic and Cenozoic strata. The oldest strata sampled belong to a Neocom ...
Geology and Landforms Factsheet - the Dartmoor National Park
... The resultant gravel is called growan. During periglacial times it became very mobile - moving down slopes and accumulating on flat ground as head deposits. It is the parent material for a number of Dartmoor soil types. Weathering can also give rise to smooth, bowl-like depressions known as rock bas ...
... The resultant gravel is called growan. During periglacial times it became very mobile - moving down slopes and accumulating on flat ground as head deposits. It is the parent material for a number of Dartmoor soil types. Weathering can also give rise to smooth, bowl-like depressions known as rock bas ...
Chapter Twelve: Intrusive Rocks
... Isolated plutons and small batholiths occur sporadically and with decreasing abundance to the far eastern limits of the Tagish map area where they intrude the Cache Creek terrane. Several intrusive episodes are recognized within each tectonostratigraphic terrane. Young intrusive episodes have affect ...
... Isolated plutons and small batholiths occur sporadically and with decreasing abundance to the far eastern limits of the Tagish map area where they intrude the Cache Creek terrane. Several intrusive episodes are recognized within each tectonostratigraphic terrane. Young intrusive episodes have affect ...
secondary planar structural elements
... The morphology of foliations reflects formation processes. For example, bedding-parallel foliation may reflect compaction, i.e. volume reduction due to pore-water expulsion from fresh sediments under the increasing weight of overburden load. In deeper crustal levels, the foliation morphology varies ...
... The morphology of foliations reflects formation processes. For example, bedding-parallel foliation may reflect compaction, i.e. volume reduction due to pore-water expulsion from fresh sediments under the increasing weight of overburden load. In deeper crustal levels, the foliation morphology varies ...
Age and petrogenesis of the Tinn granite, Telemark, South
... plotted in a concordia diagram, a majority of points cluster along a lead-loss line from a Mid Proterozoic upper intercept to a lower intercept which is poorly defined, but within analytical uncertainty of 0 Ma (Fig. 3a). Several points fall significantly to the left of this line, however, suggestin ...
... plotted in a concordia diagram, a majority of points cluster along a lead-loss line from a Mid Proterozoic upper intercept to a lower intercept which is poorly defined, but within analytical uncertainty of 0 Ma (Fig. 3a). Several points fall significantly to the left of this line, however, suggestin ...
Geology of the Kaikoura Area
... mapped in terms of age of protolith (where known), with overprints indicating degree of metamorphism. Age subdivision is in terms of the international time scale. Correlation between international and local time scales and absolute ages in millions of years (Ma) are shown inside the front cover (Coo ...
... mapped in terms of age of protolith (where known), with overprints indicating degree of metamorphism. Age subdivision is in terms of the international time scale. Correlation between international and local time scales and absolute ages in millions of years (Ma) are shown inside the front cover (Coo ...
Geology of the Kaikoura Area
... mapped in terms of age of protolith (where known), with overprints indicating degree of metamorphism. Age subdivision is in terms of the international time scale. Correlation between international and local time scales and absolute ages in millions of years (Ma) are shown inside the front cover (Coo ...
... mapped in terms of age of protolith (where known), with overprints indicating degree of metamorphism. Age subdivision is in terms of the international time scale. Correlation between international and local time scales and absolute ages in millions of years (Ma) are shown inside the front cover (Coo ...
Commentary on schematic geological map of Antarctica Scale 1:10
... from the Wilson Terrane, which lies to the west (and is Cainozoic magmatic arc complex , instead of a volcanic and inadvertently not indicated on the map) . The Wilson sedimentary pile of that age overlying a Palaeozoic or Terrane con ists of metamorphic rock , probably of late Precambrian metamorph ...
... from the Wilson Terrane, which lies to the west (and is Cainozoic magmatic arc complex , instead of a volcanic and inadvertently not indicated on the map) . The Wilson sedimentary pile of that age overlying a Palaeozoic or Terrane con ists of metamorphic rock , probably of late Precambrian metamorph ...
Setting Based Classification
... • Mild deformation and no igneous intrusions discovered • Fine-grained, high-temperature phases, glassy ash: very susceptible to metamorphic alteration • Metamorphic effects attributed to increased pressure and temperature due to burial ...
... • Mild deformation and no igneous intrusions discovered • Fine-grained, high-temperature phases, glassy ash: very susceptible to metamorphic alteration • Metamorphic effects attributed to increased pressure and temperature due to burial ...
Mantle Exhumation in an Early Paleozoic Passive Margin, Northern
... ter- to centimeter-scale veinlets of serpentine and magnetite locally crosscut the mineralogical layering and give the rock a bluish white weathered surface. Texturally, the rock is coarse lherzolite; coarse olivine is variably serpentinized (0%–70%), but coarse orthopyroxene (1–4 mm) and small grai ...
... ter- to centimeter-scale veinlets of serpentine and magnetite locally crosscut the mineralogical layering and give the rock a bluish white weathered surface. Texturally, the rock is coarse lherzolite; coarse olivine is variably serpentinized (0%–70%), but coarse orthopyroxene (1–4 mm) and small grai ...
the form of the fongen-hyllingen gabbro complex, trondheim region
... of contact metamorphic zones has not been established to the south of the River Nea, though approximate localities of individual occurrences of index minerals reported by Kisch (1962), Nilsen (1971, 1973) and Birkeland & Nilsen (1971) are shown in Fig. 2. An outermost andalusite zone of contact meta ...
... of contact metamorphic zones has not been established to the south of the River Nea, though approximate localities of individual occurrences of index minerals reported by Kisch (1962), Nilsen (1971, 1973) and Birkeland & Nilsen (1971) are shown in Fig. 2. An outermost andalusite zone of contact meta ...
Geology of the Murihiku Area
... Stewart Island has been mapped in detail for the first time (see Appendix 1), and there have been numerous detailed onshore and offshore geological and geophysical studies of parts of the area by government, university and industry geologists. The need for geological information has increased as a r ...
... Stewart Island has been mapped in detail for the first time (see Appendix 1), and there have been numerous detailed onshore and offshore geological and geophysical studies of parts of the area by government, university and industry geologists. The need for geological information has increased as a r ...
Near-Ultrahigh Pressure Processing of Continental Crust: Miocene
... the remains of thin-section billets. This is not ideal because the samples are contaminated with epoxy from thin-section impregnation, and some include bits of host lava. Billets were first abraded with silicon carbide to remove as much as possible of the epoxy and weathered surfaces, and then powde ...
... the remains of thin-section billets. This is not ideal because the samples are contaminated with epoxy from thin-section impregnation, and some include bits of host lava. Billets were first abraded with silicon carbide to remove as much as possible of the epoxy and weathered surfaces, and then powde ...
composition of biotite from granitic rocks
... eastonite–siderophyllite solid solutions, i.e., biotite, are found in nearly all types of granites and granitic rocks. By virtue of their crystal structure, these micas can accommodate most of the common elements present in granitic magmas. The following features make biotite a valuable probe of mag ...
... eastonite–siderophyllite solid solutions, i.e., biotite, are found in nearly all types of granites and granitic rocks. By virtue of their crystal structure, these micas can accommodate most of the common elements present in granitic magmas. The following features make biotite a valuable probe of mag ...
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.