The Río de la Plata Craton: a review of units, boundaries, ages and
... [FeO* ? MgO] ratios, similar to the typical rapakivi granites in southern Finland (Oyhantçabal et al. 1998), but it belongs to the A2-type post-collisional granites of Eby (1992). A SHRIMP zircon U–Pb age of 2,056 ± 6 Ma, reported by Santos et al. (2003), is the best estimation of the crystallizati ...
... [FeO* ? MgO] ratios, similar to the typical rapakivi granites in southern Finland (Oyhantçabal et al. 1998), but it belongs to the A2-type post-collisional granites of Eby (1992). A SHRIMP zircon U–Pb age of 2,056 ± 6 Ma, reported by Santos et al. (2003), is the best estimation of the crystallizati ...
view the Lecture Presentation
... Skeletons of marine invertebrates. Born in the carbonate factory. Warm, clear, shallow, normal salinity, marine water. ...
... Skeletons of marine invertebrates. Born in the carbonate factory. Warm, clear, shallow, normal salinity, marine water. ...
Tertiary stratigraphy and tectonic evolution of southern Sumatra
... Kikim and Tarahan Formations of the Barisan Zone, and sedimentation in the Ombilin and South Sumatra Basins. However, compared to both the earlier upper Cretaceous magmatic arc and the dominantly Neogene Arc of western Sumatra, this Paleogene volcanism is minor and the lack of an extensive active vo ...
... Kikim and Tarahan Formations of the Barisan Zone, and sedimentation in the Ombilin and South Sumatra Basins. However, compared to both the earlier upper Cretaceous magmatic arc and the dominantly Neogene Arc of western Sumatra, this Paleogene volcanism is minor and the lack of an extensive active vo ...
Frimmel_Chameis subterrane_Gariep
... of stromatolitic dolomite on top of the mafic volcanics suggests the build-up of reef mounds above the top surface of a guyot leading to the formation of an atoll. The distribution of those trace elements which are typically concentrated in continental detrital phases, such as Zr and Nb, indicate an ...
... of stromatolitic dolomite on top of the mafic volcanics suggests the build-up of reef mounds above the top surface of a guyot leading to the formation of an atoll. The distribution of those trace elements which are typically concentrated in continental detrital phases, such as Zr and Nb, indicate an ...
Sedimentary Rocks
... IV. Morphology (texture) A. Definition of texture: “the size and shape of the particle that make up the rock.” B. Size C. Shape ...
... IV. Morphology (texture) A. Definition of texture: “the size and shape of the particle that make up the rock.” B. Size C. Shape ...
Sedimentary Rocks
... IV. Morphology (texture) A. Definition of texture: “the size and shape of the particle that make up the rock.” B. Size C. Shape ...
... IV. Morphology (texture) A. Definition of texture: “the size and shape of the particle that make up the rock.” B. Size C. Shape ...
The Oldest Rocks on Earth
... 4.4 billion years ago and simply have remained there in Earth’s crust ever since. O’Neil’s team has returned to Nuvvuagittuq, building up its collection of ancient rocks from 10 to about 50. None of the new data have clashed with the original estimation for the age of the site. O’Neil also rejects t ...
... 4.4 billion years ago and simply have remained there in Earth’s crust ever since. O’Neil’s team has returned to Nuvvuagittuq, building up its collection of ancient rocks from 10 to about 50. None of the new data have clashed with the original estimation for the age of the site. O’Neil also rejects t ...
PDF - UCSB Earth Science - University of California, Santa Barbara
... examined their volcanic stratigraphy, and even fewer have focused on silicic LIPs (White and Skilling, 2008). As a newcomer to research in this part of Mexico, I present a discussion of the volcanology, stratigraphy and structure of the SMO silicic LIP, mainly by pointing out unresolved problems. Di ...
... examined their volcanic stratigraphy, and even fewer have focused on silicic LIPs (White and Skilling, 2008). As a newcomer to research in this part of Mexico, I present a discussion of the volcanology, stratigraphy and structure of the SMO silicic LIP, mainly by pointing out unresolved problems. Di ...
Advertising - Science Outreach
... collision of the Pacific tectonic Plate and the Australia Plate started, resulting in the uplift and folding of those sediments. This event is called the Rangitata Orogeny (see glossary). The first collision lasted for 50 million years during which some of the sediments were submerged to great dept ...
... collision of the Pacific tectonic Plate and the Australia Plate started, resulting in the uplift and folding of those sediments. This event is called the Rangitata Orogeny (see glossary). The first collision lasted for 50 million years during which some of the sediments were submerged to great dept ...
Castle Hill Field Guide (Teacher version)
... collision of the Pacific tectonic Plate and the Australia Plate started, resulting in the uplift and folding of those sediments. This event is called the Rangitata Orogeny (see glossary). The first collision lasted for 50 million years during which some of the sediments were submerged to great dept ...
... collision of the Pacific tectonic Plate and the Australia Plate started, resulting in the uplift and folding of those sediments. This event is called the Rangitata Orogeny (see glossary). The first collision lasted for 50 million years during which some of the sediments were submerged to great dept ...
High pore pressures and porosity at 35 km depth in the Cascadia
... incoming oceanic crust has relatively high porosities of 5%–10% supported by a crystalline framework, which may persist to greater depths. A more likely source of fluid at 25–45 km depth is metamorphic dehydration reactions. Beginning at shallow levels with the breakdown of clay minerals and extendi ...
... incoming oceanic crust has relatively high porosities of 5%–10% supported by a crystalline framework, which may persist to greater depths. A more likely source of fluid at 25–45 km depth is metamorphic dehydration reactions. Beginning at shallow levels with the breakdown of clay minerals and extendi ...
Powerpoint Presentation Physical Geology, 10/e
... – Composed of horizontal sediment layers probably deposited by turbidity currents. – Flattest features on the Earth. ...
... – Composed of horizontal sediment layers probably deposited by turbidity currents. – Flattest features on the Earth. ...
Activity–Pacific Northwest Tectonic Block Model
... arc (red triangles) erupts along the trailing edge of Oregon block in a region of crustal extension. Orange areas, representing young volcanic rocks erupted in the last 2 million years, are more voluminous south of Mt. Rainier, when compared to the northern arc, where block motion compresses the vol ...
... arc (red triangles) erupts along the trailing edge of Oregon block in a region of crustal extension. Orange areas, representing young volcanic rocks erupted in the last 2 million years, are more voluminous south of Mt. Rainier, when compared to the northern arc, where block motion compresses the vol ...
Styles of post-subduction collisional orogeny: Influence of
... In all subsequent discussion, the plate with an initial oceanic component is considered to be the “left plate” and the imposed motion is to the right. To distinguish different parts of the crustal collisional zone we have used the terminology adopted in Jamieson et al., 1998, where the prowedge indi ...
... In all subsequent discussion, the plate with an initial oceanic component is considered to be the “left plate” and the imposed motion is to the right. To distinguish different parts of the crustal collisional zone we have used the terminology adopted in Jamieson et al., 1998, where the prowedge indi ...
117. Lee, C. - Cin
... crustal thickness signifies net growth of continents, whereas the decline in crustal thickness since about 1 Ga suggests net destruction of continental crust in subduction zones. However, the data only constrain thickness during juvenile crust formation and cannot be applied to the crust that remain ...
... crustal thickness signifies net growth of continents, whereas the decline in crustal thickness since about 1 Ga suggests net destruction of continental crust in subduction zones. However, the data only constrain thickness during juvenile crust formation and cannot be applied to the crust that remain ...
sequences
... – a southern equatorial position during the Cambrian – to north temperate latitudes – by the end of the Silurian Period ...
... – a southern equatorial position during the Cambrian – to north temperate latitudes – by the end of the Silurian Period ...
Skye: A landscape fashioned by geology
... sub-dividing rock successions. At the other extreme of size are the remains of reptiles such as ichthyosaurs and plesiosaurs - the sea living relatives of the dinosaurs which roamed the land at this time. Fossil plants and indeterminate fragments of fossilised wood show that ...
... sub-dividing rock successions. At the other extreme of size are the remains of reptiles such as ichthyosaurs and plesiosaurs - the sea living relatives of the dinosaurs which roamed the land at this time. Fossil plants and indeterminate fragments of fossilised wood show that ...
Are lithospheres forever?
... terranes of both Archaean and Proterozoic age. Mapping based on garnet and chromite concentrates from >50 kimberlites along this trend shows that within-craton domains with distinctive mantle stratigraphy coincide with crustal terranes mapped at the surface (Griffin et al., 1998a), implying that ind ...
... terranes of both Archaean and Proterozoic age. Mapping based on garnet and chromite concentrates from >50 kimberlites along this trend shows that within-craton domains with distinctive mantle stratigraphy coincide with crustal terranes mapped at the surface (Griffin et al., 1998a), implying that ind ...
IOCG and Porphyry-Cu deposits in Northern
... the main period of the formation of the crust during the Svecokarelian (or Svecofennian) orogeny roughly between 1.95 and 1.77 Ga (e.g. Rickard & Zweifel 1975, Pharaoh & Pearce 1984, Berthelsen & Marker 1986, Gaál 1986, Weihed 1992). This orogeny involved both strong reworking of older crust within ...
... the main period of the formation of the crust during the Svecokarelian (or Svecofennian) orogeny roughly between 1.95 and 1.77 Ga (e.g. Rickard & Zweifel 1975, Pharaoh & Pearce 1984, Berthelsen & Marker 1986, Gaál 1986, Weihed 1992). This orogeny involved both strong reworking of older crust within ...
Chapter 9 - LSU Geology & Geophysics
... – indicates that North America may have had – an Early Proterozoic ice sheet centered southwest of Hudson Bay ...
... – indicates that North America may have had – an Early Proterozoic ice sheet centered southwest of Hudson Bay ...
Tectonic Assembly of the Northern Andean Block
... ased primarily on geologic field observations as recorded by numerous geoscientists over the last three decades, backed by more recent geochemical, seismic, gravity, magnetic, tomographic, and satellite-based techniques, an integrated synthesis and interpretation of the tectonic assembly of the enti ...
... ased primarily on geologic field observations as recorded by numerous geoscientists over the last three decades, backed by more recent geochemical, seismic, gravity, magnetic, tomographic, and satellite-based techniques, an integrated synthesis and interpretation of the tectonic assembly of the enti ...
Metallogeny of Paleogene and Neogene volcanic belts in Hungary
... Periadriatic syn- and post-syncollisional magmatic belt which formed in the collision zone between the Adriatic microplate and the European plate. Northeastward escape of continental blocks from the collision zone initiated the subsequent Carpathian subduction, and the Neogene belt is genetically co ...
... Periadriatic syn- and post-syncollisional magmatic belt which formed in the collision zone between the Adriatic microplate and the European plate. Northeastward escape of continental blocks from the collision zone initiated the subsequent Carpathian subduction, and the Neogene belt is genetically co ...
Chapter 1: Geologic History of the Southwestern US:
... in the rocks of the Southwestern US. By knowing more about the geologic history of your area, you can better understand the types of rocks that are in your backyard and why they are there. In this chapter, we will look at the history of the Southwest as it unfolded: as a series of major events that ...
... in the rocks of the Southwestern US. By knowing more about the geologic history of your area, you can better understand the types of rocks that are in your backyard and why they are there. In this chapter, we will look at the history of the Southwest as it unfolded: as a series of major events that ...
GEOL3025, Section 096 Lecture #7 30 August 2007
... Metamorphic = to change form Transition of one rock into another by application of pressure and/or temperature unlike those from which it formed. Sedimentary rocks Igneous rocks Other metamorphic rocks ...
... Metamorphic = to change form Transition of one rock into another by application of pressure and/or temperature unlike those from which it formed. Sedimentary rocks Igneous rocks Other metamorphic rocks ...
GS-18 - Government of Manitoba
... overlies Burntwood Group turbidite and contains a similar style of folds. It is compositionally heterogeneous, containing coarse- to fine-grained siliciclastic rocks, calc-silicate gneiss and greywacke, as well as mafic to intermediate volcanic and associated volcaniclastic rocks. Its stratigraphic ...
... overlies Burntwood Group turbidite and contains a similar style of folds. It is compositionally heterogeneous, containing coarse- to fine-grained siliciclastic rocks, calc-silicate gneiss and greywacke, as well as mafic to intermediate volcanic and associated volcaniclastic rocks. Its stratigraphic ...
Great Lakes tectonic zone
The Great Lakes tectonic zone is bounded by South Dakota at its tip and heads northeast to south of Duluth, Minnesota, then heads east through northern Wisconsin, Marquette, Michigan, and then trends more northeasterly to skim the northern-most shores of lakes Michigan and Huron before ending in the Sudbury, Ontario, Canada, area.During the Late Archean Era the Algoman orogeny added landmass to the Superior province by volcanic activity and continental collision along a boundary that stretches from present-day South Dakota, U.S., into the Lake Huron region near Sudbury, Ontario, Canada.This crustal boundary is the Great Lakes tectonic zone. It is 1,400 km (870 mi) long, and separates the older Archean gneissic terrane to the south from younger Late Archean greenstone-granite terrane to the north.The zone is characterized by active compression during the Algoman orogeny (about 2,700 million years ago), a pulling-apart (extensional) tectonics (2,450 to 2,100 million years ago), a second compression during the Penokean orogeny (1,900 to 1,850 million years ago), a second extension during Middle Proterozoic time (1,600 million years ago) and minor reactivation during Phanerozoic time (the past 500 million years).Collision began along the Great Lakes tectonic zone (GLTZ) with the Algoman mountain-building event and continued for tens of millions of years. During the formation of the GLTZ, the gneissic Minnesota River Valley subprovince was thrust up onto the Superior province's edge as it consumed the Superior province's oceanic crust. Fragmentation of the Kenorland supercontinent began 2,450 million years ago and was completed by 2,100 million years ago. The Wyoming province is the continental landmass that is hypothesized to have rifted away from the southern Superior province portion of Kenorland, before moving rapidly west and docking with the Laurentia supercontinent 1,850 to 1,715 million years ago. Sedimentation from the GLTZ-rifting environment continued into the Penokean orogeny, which is the next major tectonic event in the Great Lakes region. Several earthquakes have been documented in Minnesota, Michigan's Upper Peninsula and Sudbury in the last 120 years along the GLTZ.