Recent Movements of the Juan de Fuca Plate System
... Analysis of the magnetic anomaliesof the Juan de Fuca plate systemallows instantaneouspoles of rotation relative to the Pacific plate to be calculatedfrom 7 Ma to the present.By combiningthesewith global solutions for Pacific/America and "absolute" (relative to hot spot) motions, a plate motion sequ ...
... Analysis of the magnetic anomaliesof the Juan de Fuca plate systemallows instantaneouspoles of rotation relative to the Pacific plate to be calculatedfrom 7 Ma to the present.By combiningthesewith global solutions for Pacific/America and "absolute" (relative to hot spot) motions, a plate motion sequ ...
Geological division of the rocks at southeast of
... 3. Lithology and geological structure in the Gachuurt-Nalaikh area The rocks of this area are composed mainly of thick massive sandstone, and minor bedded sandstone, alternating beds of sandstone and mudstone, and conglomerate with chert slabs (Fig. 3). The rocks generally strike NE to NW, steeply ...
... 3. Lithology and geological structure in the Gachuurt-Nalaikh area The rocks of this area are composed mainly of thick massive sandstone, and minor bedded sandstone, alternating beds of sandstone and mudstone, and conglomerate with chert slabs (Fig. 3). The rocks generally strike NE to NW, steeply ...
Tectonic and Structural Development of Cenozoic Basins of Malaysia
... late Cretaceous granitic plutons in the northern Sunda She lf region . At the triple junction is thicker crust that may represent the root of differentiated mantle-plume material. The Malay dome is estimated at 1000 km across and its relics are the comparatively high positions of pre-Tertiary baseme ...
... late Cretaceous granitic plutons in the northern Sunda She lf region . At the triple junction is thicker crust that may represent the root of differentiated mantle-plume material. The Malay dome is estimated at 1000 km across and its relics are the comparatively high positions of pre-Tertiary baseme ...
IQUAME - Guidelines for the Review
... origin and the fabric is matrix supported, may also be categorized as wackestone. If rock has unsorted or poorly sorted texture with a wide range of particle sizes, may also be categorized as diamictite. Unsorted or poorly sorted, clastic sediment with a wide range of particle sizes, including a mud ...
... origin and the fabric is matrix supported, may also be categorized as wackestone. If rock has unsorted or poorly sorted texture with a wide range of particle sizes, may also be categorized as diamictite. Unsorted or poorly sorted, clastic sediment with a wide range of particle sizes, including a mud ...
Behavior of subducting sediments beneath an arc under a high
... variation diagrams also indicate similar contributions. Since the breakdown of mica, which is included both in the pelagic and terrigenous sediments, is inferred to induce dehydration melting of the sediments, above geochemical characteristics suggest that both sediments would melt simultaneously be ...
... variation diagrams also indicate similar contributions. Since the breakdown of mica, which is included both in the pelagic and terrigenous sediments, is inferred to induce dehydration melting of the sediments, above geochemical characteristics suggest that both sediments would melt simultaneously be ...
Postseismic crustal deformation following the
... best fit viscoelastic model. 2.6 years are 2.4 mm/yr (east), 1.9 mm/yr (north), and 4.1 mm/yr (vertical). Dixon et al. [2000] pointed out that errors given by Mao et al. [1999] may be values too large for modern analyses or different site locations. Since the velocities relative to Wakkanai and Osho ...
... best fit viscoelastic model. 2.6 years are 2.4 mm/yr (east), 1.9 mm/yr (north), and 4.1 mm/yr (vertical). Dixon et al. [2000] pointed out that errors given by Mao et al. [1999] may be values too large for modern analyses or different site locations. Since the velocities relative to Wakkanai and Osho ...
Stratigraphy and structural geology of the hangingwall to the
... that are unconformably overlain by younger fluvial sedimentary rocks of the Missi Group (ca. 1.84 Ga; Bailes and Syme, 1989; Stern et al., 1995; Lucas et al., 1996). Rocks of the Flin Flon arc assemblage are interpreted to have been erupted and emplaced in an island-arc–backarc setting, and consist o ...
... that are unconformably overlain by younger fluvial sedimentary rocks of the Missi Group (ca. 1.84 Ga; Bailes and Syme, 1989; Stern et al., 1995; Lucas et al., 1996). Rocks of the Flin Flon arc assemblage are interpreted to have been erupted and emplaced in an island-arc–backarc setting, and consist o ...
Some Thermal Constraints on Crustal
... contamination, and to improve melt models involving hydrous magma in volcanic arcs and in the lower continental crust ...
... contamination, and to improve melt models involving hydrous magma in volcanic arcs and in the lower continental crust ...
IODP Proposal Cover Sheet
... The spatial and temporal evolution of arc magmas within a single oceanic arc is fundamental to understanding the initiation and evolution of oceanic arcs and the genesis of continental crust, which is one key objective of the IODP ISP. The Izu-Bonin-Mariana arc has been a target for this task for ma ...
... The spatial and temporal evolution of arc magmas within a single oceanic arc is fundamental to understanding the initiation and evolution of oceanic arcs and the genesis of continental crust, which is one key objective of the IODP ISP. The Izu-Bonin-Mariana arc has been a target for this task for ma ...
NWGS Pasco Basin
... occurs in the basal portion of flows. In CRBG flows, the colonnade can make up the entire flow thickness, or there may be one or more colonnades present that are tiered with entablatures. Zones or layers of vesicles occur in the interior portions of the lavas and are physically distinct from a vesicula ...
... occurs in the basal portion of flows. In CRBG flows, the colonnade can make up the entire flow thickness, or there may be one or more colonnades present that are tiered with entablatures. Zones or layers of vesicles occur in the interior portions of the lavas and are physically distinct from a vesicula ...
Plate boundary deformation between the Pacific and North America
... and magnitude of the total motion accommodated across the zone, however, was unchanged. The small differences in local magnitudes of velocity are a consequence of the fact that all the events since 1994 had a magnitude less than 5.4, where it appears that only earthquakes with magnitudes higher than ...
... and magnitude of the total motion accommodated across the zone, however, was unchanged. The small differences in local magnitudes of velocity are a consequence of the fact that all the events since 1994 had a magnitude less than 5.4, where it appears that only earthquakes with magnitudes higher than ...
Age and petrogenesis of the Tinn granite, Telemark, South
... zoning, in most grains overgrown by a thin and discontinuous, BSE-bright outer zone (Fig. 2a). These overgrowths were too thin to be analysed, but were most likely formed during metamorphic recrystallization of the granite. Xenocrystic cores predating the main zircon-forming event, with boundaries c ...
... zoning, in most grains overgrown by a thin and discontinuous, BSE-bright outer zone (Fig. 2a). These overgrowths were too thin to be analysed, but were most likely formed during metamorphic recrystallization of the granite. Xenocrystic cores predating the main zircon-forming event, with boundaries c ...
geologic trips to the Sea Ranch
... If we had taken a trip to the Monterey area 90 million years ago we would have seen a landscape of low hills separated by broad river valleys. An arm of the Pacific ocean extended into these hills to form an ocean basin, the Gualala basin. This basin formed when the earth's crust was fractured and p ...
... If we had taken a trip to the Monterey area 90 million years ago we would have seen a landscape of low hills separated by broad river valleys. An arm of the Pacific ocean extended into these hills to form an ocean basin, the Gualala basin. This basin formed when the earth's crust was fractured and p ...
The Kaapvaal craton (South Africa): no evidence for a supercontinental
... of the TML, and Limpopo Central Zone [LCZ] – see Figure 1) that underwent different crustal evolutions, and were successively accreted at c.3.23 (BN and BS), 2.9 (assembled BN-BS and MNK) and 2.65-2.7 Ga (three existing terranes and LCZ) (Zeh et al. 2009). The Murchison greenstone belt, which accret ...
... of the TML, and Limpopo Central Zone [LCZ] – see Figure 1) that underwent different crustal evolutions, and were successively accreted at c.3.23 (BN and BS), 2.9 (assembled BN-BS and MNK) and 2.65-2.7 Ga (three existing terranes and LCZ) (Zeh et al. 2009). The Murchison greenstone belt, which accret ...
sample test
... d. the continents were once joined together in a single landmass. What is Pangaea? a. the name of a German scientist b. the name of the supercontinent that existed millions of years ago c. another name for continental drift d. the name of an ancient fossil Which type of evidence was NOT used by Alfr ...
... d. the continents were once joined together in a single landmass. What is Pangaea? a. the name of a German scientist b. the name of the supercontinent that existed millions of years ago c. another name for continental drift d. the name of an ancient fossil Which type of evidence was NOT used by Alfr ...
4-6-minoura - Extras Springer
... 4. Discussion and Concluding Remarks It has been made clear that the Thera eruption and the following tsunami occurrence are recorded in the coastal sequences of western Turkey and Crete. The fallout of tephra carried by the prevailing winds in the troposphere was preceded by the invasion of tsunami ...
... 4. Discussion and Concluding Remarks It has been made clear that the Thera eruption and the following tsunami occurrence are recorded in the coastal sequences of western Turkey and Crete. The fallout of tephra carried by the prevailing winds in the troposphere was preceded by the invasion of tsunami ...
Ridge subduction and porphyry copper
... has even been proposed that adakite should be taken as an exploration target for Cu deposits [67]. The genetic connection between adakite and porphyry deposits has been attributed to the high oxygen fugacity of adakitic magmas [68]; with oxygen fugacity taken as a more important controlling factor t ...
... has even been proposed that adakite should be taken as an exploration target for Cu deposits [67]. The genetic connection between adakite and porphyry deposits has been attributed to the high oxygen fugacity of adakitic magmas [68]; with oxygen fugacity taken as a more important controlling factor t ...
Volcanoes and Earthquakes
... d. cinder cone. 12. Where are volcanoes most likely to form? a. near the center of continents c. along plate boundaries b. along bodies of water d. in mountainous areas 13. Which of these describes a possible climate change caused by a volcanic eruption? ...
... d. cinder cone. 12. Where are volcanoes most likely to form? a. near the center of continents c. along plate boundaries b. along bodies of water d. in mountainous areas 13. Which of these describes a possible climate change caused by a volcanic eruption? ...
82. Neogene Kinematics in the Japan Sea Region and Volcanic
... Along the eastern margin major structures are en-echelon northeasttrending narrow grabens separated by northwest-trending dextral transfer faults (Fig. 3). Fault-set analysis following Angelier's (1984) method reveals that from north to south the maximum horizontal compression everywhere trends nort ...
... Along the eastern margin major structures are en-echelon northeasttrending narrow grabens separated by northwest-trending dextral transfer faults (Fig. 3). Fault-set analysis following Angelier's (1984) method reveals that from north to south the maximum horizontal compression everywhere trends nort ...
KOPER, KEITH Indian Ocean Quake 9/27/12 1
... roughly 90-mile length, breaking “bilaterally” both west-northwestward and east-southeastward, and also at least 30 miles deep, “almost ripping through the whole plate,” Koper says. The seafloor on one side of the fault slipped about 100 feet past the seafloor on the fault’s other side. ...
... roughly 90-mile length, breaking “bilaterally” both west-northwestward and east-southeastward, and also at least 30 miles deep, “almost ripping through the whole plate,” Koper says. The seafloor on one side of the fault slipped about 100 feet past the seafloor on the fault’s other side. ...
PDF
... basalts” to classify the rocks as a magma-type intermediate between MORB and island-arc basalts (IAB). These were all, however, isolated locations and it was not until the mid-1980s that Hawkins and coworkers completed the first systematic sampling programs of the Lau Basin and Mariana Trough [summa ...
... basalts” to classify the rocks as a magma-type intermediate between MORB and island-arc basalts (IAB). These were all, however, isolated locations and it was not until the mid-1980s that Hawkins and coworkers completed the first systematic sampling programs of the Lau Basin and Mariana Trough [summa ...
bulletin of marine science
... Within the rather small area of the earth's surface represented by the Caribbean-Antillean region, one can find active volcanos, earthquake belts, fracture zones, deep-sea trenches, several varieties and thicknesses of continental and oceanic crusts, as well as all categories of rock types and tecto ...
... Within the rather small area of the earth's surface represented by the Caribbean-Antillean region, one can find active volcanos, earthquake belts, fracture zones, deep-sea trenches, several varieties and thicknesses of continental and oceanic crusts, as well as all categories of rock types and tecto ...
junior cert paper breakdown and 2010 sample
... • As the plates move apart molten magma rises from the mantle and fills the gap between the 2 plates. When the magma meets the cold sea water it cools and solidifies to form a new ocean floor. As the eruptions of magma continue in an endless cycle, the ocean floor is built up to form a long ridge of ...
... • As the plates move apart molten magma rises from the mantle and fills the gap between the 2 plates. When the magma meets the cold sea water it cools and solidifies to form a new ocean floor. As the eruptions of magma continue in an endless cycle, the ocean floor is built up to form a long ridge of ...
Large igneous province
A large igneous province (LIP) is an extremely large accumulation of igneous rocks, including liquid rock (intrusive) or volcanic rock formations (extrusive), when hot magma extrudes from inside the Earth and flows out. The source of many or all LIPs is variously attributed to mantle plumes or to processes associated with plate tectonics. Types of LIPs can include large volcanic provinces (LVP), created through flood basalt and large plutonic provinces (LPP). Eleven distinct flood basalt episodes occurred in the past 250 million years, creating volcanic provinces, which coincided with mass extinctions in prehistoric times. Formation depends on a range of factors, such as continental configuration, latitude, volume, rate, duration of eruption, style and setting (continental vs. oceanic), the preexisting climate state, and the biota resilience to change.