Sequence stratigraphy of source and reservoir rocks in the
... channel deposits corresponding to a marked seaward shift in facies. The deposits are interpreted as a thickly developed lowstand systems tract and constitute a major reservoir unit in the south-eastern part of the basin. The overlying Nathorst Fjeld and Harris Fjeld Members consist of a single coars ...
... channel deposits corresponding to a marked seaward shift in facies. The deposits are interpreted as a thickly developed lowstand systems tract and constitute a major reservoir unit in the south-eastern part of the basin. The overlying Nathorst Fjeld and Harris Fjeld Members consist of a single coars ...
CHAPTER 4 PRE-TERTIARY GEOLOGY OF NEVADA
... Precambrian crystalline rocks are exposed primarily in the southern part of Nevada, in Clark County and southernmost Lincoln County. The rocks are generally similar to the Precambrian assemblage exposed throughout much of southwestern North America, consisting primarily of medium- to high-grade meta ...
... Precambrian crystalline rocks are exposed primarily in the southern part of Nevada, in Clark County and southernmost Lincoln County. The rocks are generally similar to the Precambrian assemblage exposed throughout much of southwestern North America, consisting primarily of medium- to high-grade meta ...
CENOZOIC HISTORY OF THE CHUYA DEPRESSION (Gorny Altai
... structure of the formation suggest its origin in a large limnic basin, and the presence of coarse-grained interbeds with angular fragments at the depression's periphery indicates the inception of the Kurai Range. The 50 m thick Kyzyl-Gir Formation is composed of yellow-brown and gray coarse-grained ...
... structure of the formation suggest its origin in a large limnic basin, and the presence of coarse-grained interbeds with angular fragments at the depression's periphery indicates the inception of the Kurai Range. The 50 m thick Kyzyl-Gir Formation is composed of yellow-brown and gray coarse-grained ...
Seafloor spreading model
... plates collide or rub against one another. For a while, the plates get stuck even though the pressure is building up all the time and finally, when the plates release, you get an earthquake. 5. Discuss how speed might affect the number of earthquakes. Would you expect more earthquakes each year if 2 ...
... plates collide or rub against one another. For a while, the plates get stuck even though the pressure is building up all the time and finally, when the plates release, you get an earthquake. 5. Discuss how speed might affect the number of earthquakes. Would you expect more earthquakes each year if 2 ...
The Precambrian rift-related metamagmatic rocks of the Southern
... REE abundances of these rocks are listed in Table 1. The strongly altered mafic-ultramafic rocks on the REE patterns normalized to average ordinary chondrite exhibit well-pronounced negative Eu anomaly and other characteristic, which are typical for the talc-serpentine, carbonate, chlorite and tremo ...
... REE abundances of these rocks are listed in Table 1. The strongly altered mafic-ultramafic rocks on the REE patterns normalized to average ordinary chondrite exhibit well-pronounced negative Eu anomaly and other characteristic, which are typical for the talc-serpentine, carbonate, chlorite and tremo ...
Contributions to the geology of Algarve (Portugal)
... Faulting of Triasic structures and diapiric movements are very commun in Algarve and in some places those episodes suggest the presence of two or occasionaly three layers of diabases, wich is not the case. Some of those features can be seen between Vila Real de Sto. António and Castro Marim and at ...
... Faulting of Triasic structures and diapiric movements are very commun in Algarve and in some places those episodes suggest the presence of two or occasionaly three layers of diabases, wich is not the case. Some of those features can be seen between Vila Real de Sto. António and Castro Marim and at ...
Geodynamic Significance of the Kontum Massif in
... Hai 1986; Hutchison 1989) that are similar to, yet slightly older than, Rb-Sr ages of 1400–1600 Ma (Phan Truong Thi 1985); a 2300-Ma Pb-isochron age has also been mentioned in the literature (Hutchison 1989, p. 300). A significantly younger K-Ar biotite age of 398 Ⳳ 7 Ma has been reported from the D ...
... Hai 1986; Hutchison 1989) that are similar to, yet slightly older than, Rb-Sr ages of 1400–1600 Ma (Phan Truong Thi 1985); a 2300-Ma Pb-isochron age has also been mentioned in the literature (Hutchison 1989, p. 300). A significantly younger K-Ar biotite age of 398 Ⳳ 7 Ma has been reported from the D ...
mineral appraisal of certain alaska national interest lands, proposed
... they occur with the mineral deposits and environments in well-known mining districts. Recognition of a characteristic environment allows not only the delineation of a trend but also a rough estimate of the favorability of conditions in the trend for the formation of minable concentrations of mineral ...
... they occur with the mineral deposits and environments in well-known mining districts. Recognition of a characteristic environment allows not only the delineation of a trend but also a rough estimate of the favorability of conditions in the trend for the formation of minable concentrations of mineral ...
Ancient North America (Laurentia)
... preservation of one of the world’s lengthiest sedimentary record, now observed in uplifted strata along the eastern side of the Cordilleran mountain belt from California to east-central Alaska. The Proterozoic part of this record (older than 542 Ma) is deduced from ‘inliers’ (windows eroded through ...
... preservation of one of the world’s lengthiest sedimentary record, now observed in uplifted strata along the eastern side of the Cordilleran mountain belt from California to east-central Alaska. The Proterozoic part of this record (older than 542 Ma) is deduced from ‘inliers’ (windows eroded through ...
Chapter 2: Rocks of the Southeastern US
... many common sedimentary rocks, such as shale, sandstone, and most conglomerates. The evaporation of water may also form sedimentary rocks by leaving behind evaporites (previously dissolved minerals) such as salt. Deposits of calcium carbonate, usually created through the accumulation of calcium carb ...
... many common sedimentary rocks, such as shale, sandstone, and most conglomerates. The evaporation of water may also form sedimentary rocks by leaving behind evaporites (previously dissolved minerals) such as salt. Deposits of calcium carbonate, usually created through the accumulation of calcium carb ...
TOPIC:EVOLUTION OF THE SOUTHERN ALPS AND DOLOMITES
... the hiatus in sediment accumulation are compatible with the generation of magma during the initial transtensive phase of continental-scale strike-slip (SCHALTEGGER & BRACK 2007). Within the mid-Permian an unconformity exists with 10 to 15 million years of nondeposition, so that erosion played the ma ...
... the hiatus in sediment accumulation are compatible with the generation of magma during the initial transtensive phase of continental-scale strike-slip (SCHALTEGGER & BRACK 2007). Within the mid-Permian an unconformity exists with 10 to 15 million years of nondeposition, so that erosion played the ma ...
Sample - Chapter 02 - McGraw Hill Higher Education
... Origin of the Sun and Planets Impacts are not rare and insignificant events in the history of our Solar System; they probably were responsible for its formation. The most widely accepted model of the origin of the Solar System was formulated by German philosopher Immanuel Kant in 1755. He proposed t ...
... Origin of the Sun and Planets Impacts are not rare and insignificant events in the history of our Solar System; they probably were responsible for its formation. The most widely accepted model of the origin of the Solar System was formulated by German philosopher Immanuel Kant in 1755. He proposed t ...
Subduction cycles under western North America during the
... to test and quantify these concepts. Plate motions in the northeast Pacific and the rates of convergence of these plates with the North American plate during Cretaceous and Tertiary time have been studied in more detail than anywhere else in the world. Radiometric ages for tens of thousands of rocks ...
... to test and quantify these concepts. Plate motions in the northeast Pacific and the rates of convergence of these plates with the North American plate during Cretaceous and Tertiary time have been studied in more detail than anywhere else in the world. Radiometric ages for tens of thousands of rocks ...
Facies and Time
... of the worldwide oceans, formed by erosion of emergent mountains. Transported – Poorly consolidated clays, sands and gravels. Thought to have been deposited after final withdrawal of a worldwide ocean. Volcanic – Younger lava flows associated with volcanic vents (added to the classification later as ...
... of the worldwide oceans, formed by erosion of emergent mountains. Transported – Poorly consolidated clays, sands and gravels. Thought to have been deposited after final withdrawal of a worldwide ocean. Volcanic – Younger lava flows associated with volcanic vents (added to the classification later as ...
Earth SC-1002 Geological Wonder of Oman
... The Paleozoic era extends from 540 million years ago to about 245 million years ago (~7% of the time scale). Thick carbonate sequences and evaporites. Early Paleozoic marked by 6 different landmasses that will come together to form Pangea at the end of the Paleozoic. Paleozoic characterized by major ...
... The Paleozoic era extends from 540 million years ago to about 245 million years ago (~7% of the time scale). Thick carbonate sequences and evaporites. Early Paleozoic marked by 6 different landmasses that will come together to form Pangea at the end of the Paleozoic. Paleozoic characterized by major ...
Not Getting the Drift - Personal webpages at NTNU
... climate of the northern hemisphere had been much warmer in earlier geologic times, as Lyell skillfully explained: Lyell 1837, p 138. Climates of the Northern hemisphere formerly hotter. – That the climate of the Northern hemisphere has undergone an important change, and that its mean annual temperat ...
... climate of the northern hemisphere had been much warmer in earlier geologic times, as Lyell skillfully explained: Lyell 1837, p 138. Climates of the Northern hemisphere formerly hotter. – That the climate of the Northern hemisphere has undergone an important change, and that its mean annual temperat ...
Volcanism and its Contribution to Mudrock Genesis
... or it may have been derived from the reworking of older deposits. However, as noted some years ago by Tourtelot (1974, p. 269) ‘... the accumulation of nearly all the highly montmorillonitic, thick, and widespread shale units that are of recognized engineering, industrial, or agricultural significan ...
... or it may have been derived from the reworking of older deposits. However, as noted some years ago by Tourtelot (1974, p. 269) ‘... the accumulation of nearly all the highly montmorillonitic, thick, and widespread shale units that are of recognized engineering, industrial, or agricultural significan ...
ROAD LOG GUIDE TO THE GEOLOGY OF OGDEN CANYON
... Stage 2- Rifting and deposition of sedimentary rocks. The western edge of North America, which long ago was part of a super continent called Rodinia, underwent rifting from about 700 to 550 million years ago, with deposition of thick sedimentary and volcanic sequences to the west, inlcuding ancient ...
... Stage 2- Rifting and deposition of sedimentary rocks. The western edge of North America, which long ago was part of a super continent called Rodinia, underwent rifting from about 700 to 550 million years ago, with deposition of thick sedimentary and volcanic sequences to the west, inlcuding ancient ...
Geosphere - Squarespace
... invoke an increase in volcanic CO2 production due to higher oceanic crust production rates, higher frequency of large igneous provinces, or increases in pelagic carbonate deposition, the last leading to enhanced carbonate subduction into the mantle source regions of arc volcanoes. However, these are ...
... invoke an increase in volcanic CO2 production due to higher oceanic crust production rates, higher frequency of large igneous provinces, or increases in pelagic carbonate deposition, the last leading to enhanced carbonate subduction into the mantle source regions of arc volcanoes. However, these are ...
Evolution of the Paleo-Asian Ocean (Altai−Sayan Region, Central
... been integrated after Dobretsov et al. (1995). Fragments detached from Gondwanaland in Early Paleozoic have been postulated not only in Central Asia but also in the Middle East (Cocks, 2001 and the references). However, the breakup processes of Gondwana as well as those of Rodinia are still hypothet ...
... been integrated after Dobretsov et al. (1995). Fragments detached from Gondwanaland in Early Paleozoic have been postulated not only in Central Asia but also in the Middle East (Cocks, 2001 and the references). However, the breakup processes of Gondwana as well as those of Rodinia are still hypothet ...
Geologic Time - North Coast Distance Education
... rocks of Great Britain, he visualized “no vestige of a beginning—no prospect of an end.” In a way, what Copernicus did for space, Hutton did for time. The universe does not revolve around Earth, and time is not measured by the life span of humans. Before Hutton, human history was all of history. Sin ...
... rocks of Great Britain, he visualized “no vestige of a beginning—no prospect of an end.” In a way, what Copernicus did for space, Hutton did for time. The universe does not revolve around Earth, and time is not measured by the life span of humans. Before Hutton, human history was all of history. Sin ...
Himalayan Granite
... using geophysical methods, notably seismology. Earthquakes occur when rocks deep in the crust move along faults and spontaneously release energy. Earthquakes release shock waves, which travel along the surface of the earth (surface waves) and cause the ground to vibrate. Shorter period vibrations mo ...
... using geophysical methods, notably seismology. Earthquakes occur when rocks deep in the crust move along faults and spontaneously release energy. Earthquakes release shock waves, which travel along the surface of the earth (surface waves) and cause the ground to vibrate. Shorter period vibrations mo ...
Page-size Geologic Map of Washington
... Washington’s geology is highly diverse. Rocks of Precambrian age, as well as from every geologic period from Cambrian to Quaternary, are represented. The state has been subject to continental collisions, metamorphism, intrusion of igneous rocks, volcanism, mountain-building, erosion, and massive flo ...
... Washington’s geology is highly diverse. Rocks of Precambrian age, as well as from every geologic period from Cambrian to Quaternary, are represented. The state has been subject to continental collisions, metamorphism, intrusion of igneous rocks, volcanism, mountain-building, erosion, and massive flo ...
Paleoproterozoic Metamorphism in the Northern Wyoming Province
... yield a mixture of Archean and Proterozoic ages, but they did not provide precise ages for either component. The monazite age reported here is compatible with those conclusions and suggests that the leucogranite formed at ∼1.77 Ga, probably via partial melting of Archean gneisses. ...
... yield a mixture of Archean and Proterozoic ages, but they did not provide precise ages for either component. The monazite age reported here is compatible with those conclusions and suggests that the leucogranite formed at ∼1.77 Ga, probably via partial melting of Archean gneisses. ...
Record - cloudfront.net
... place of origin by tectonic processes. Allochthonous: present place. ...
... place of origin by tectonic processes. Allochthonous: present place. ...
Geological history of Earth
The geological history of Earth follows the major events in Earth's past based on the geologic time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System.Earth was initially molten due to extreme volcanism and frequent collisions with other bodies. Eventually, the outer layer of the planet cooled to form a solid crust when water began accumulating in the atmosphere. The Moon formed soon afterwards, possibly as the result of a Mars-sized object with about 10% of the Earth's mass impacting the planet in a glancing blow. Some of this object's mass merged with the Earth, significantly altering its internal composition, and a portion was ejected into space. Some of the material survived to form an orbiting moon. Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered from comets, produced the oceans.As the surface continually reshaped itself over hundreds of millions of years, continents formed and broke apart. They migrated across the surface, occasionally combining to form a supercontinent. Roughly 750 million years ago, the earliest-known supercontinent Rodinia, began to break apart. The continents later recombined to form Pannotia, 600 to 540 million years ago, then finally Pangaea, which broke apart 180 million years ago.The present pattern of ice ages began about 40 million years ago, then intensified at the end of the Pliocene. The polar regions have since undergone repeated cycles of glaciation and thaw, repeating every 40,000–100,000 years. The last glacial period of the current ice age ended about 10,000 years ago.