III. Continental intraplate alkaline series
... B. Diversity of alkaline rocks Continental alkaline rocks can be extremely diverse in terms of their Fe-Mg contents, their degree of undersaturation, or their K/Na ratios. 1. The normal alkali magmas Two main series: a saturated to moderately undersaturated (basalts, trachy-andesites to trachytes an ...
... B. Diversity of alkaline rocks Continental alkaline rocks can be extremely diverse in terms of their Fe-Mg contents, their degree of undersaturation, or their K/Na ratios. 1. The normal alkali magmas Two main series: a saturated to moderately undersaturated (basalts, trachy-andesites to trachytes an ...
Ducea, M. N., Kidder, S. B., Chesley, J. T., and
... The Monterey terrane was translated 310–350 km to the north by the San Andreas fault with respect to its origin in southern California (Page et al. 1998). The San Andreas is unambiguously the eastern boundary of this block (Figure 2); however no obvious fault uniquely separates the block’s large-sca ...
... The Monterey terrane was translated 310–350 km to the north by the San Andreas fault with respect to its origin in southern California (Page et al. 1998). The San Andreas is unambiguously the eastern boundary of this block (Figure 2); however no obvious fault uniquely separates the block’s large-sca ...
Taikos g. 2, LT-21371, Vievis, Elektrėnų Municipality
... A certain part of the exposition is occupied by the metamorphic rocks divided into smaller subgroups. They constitute the majority of boulders found in Lithuania. Let us take a closer look at some of them. Metamorphic rocks are formed through the endogenous processes acting on the sedimentary, igneo ...
... A certain part of the exposition is occupied by the metamorphic rocks divided into smaller subgroups. They constitute the majority of boulders found in Lithuania. Let us take a closer look at some of them. Metamorphic rocks are formed through the endogenous processes acting on the sedimentary, igneo ...
Click here to the FieldTrip Guide
... The Santinho trail, bordering the hill that separates Santinho and Moçambique beaches, begins at the Costão do Santinho Resort and is one of the only, and certainly the best, exposure of older Neoproterozoic granites in the Santa Catarina Island, elsewhere dominated by younger A-type granites. Stop ...
... The Santinho trail, bordering the hill that separates Santinho and Moçambique beaches, begins at the Costão do Santinho Resort and is one of the only, and certainly the best, exposure of older Neoproterozoic granites in the Santa Catarina Island, elsewhere dominated by younger A-type granites. Stop ...
68a_Chemale Hartmann..
... The study area covers part of the Mantiqueira Province (Fig. 1) which consists of Archaean to Late Palaeozoic units formed during at least four main orogenic cycles, namely the Jequié (3330-2600 Ma), Trans-Amazonian (2600-1800 Ma), Uruçuano (1800 to 1000 Ma) and Brasiliano (1000-450 Ma) (Almeida and ...
... The study area covers part of the Mantiqueira Province (Fig. 1) which consists of Archaean to Late Palaeozoic units formed during at least four main orogenic cycles, namely the Jequié (3330-2600 Ma), Trans-Amazonian (2600-1800 Ma), Uruçuano (1800 to 1000 Ma) and Brasiliano (1000-450 Ma) (Almeida and ...
The Geology of the Paleozoic Era
... • In the Cambrian, several small terranes lay to the south of Laurentia as it separated from Baltica. The shores were passive margins. • In the Ordovician, about 500 mya, the direction of plate motion reversed and Iapetus began to close. ...
... • In the Cambrian, several small terranes lay to the south of Laurentia as it separated from Baltica. The shores were passive margins. • In the Ordovician, about 500 mya, the direction of plate motion reversed and Iapetus began to close. ...
27Jan05_lec
... including some 75% of land areas and 100% of the ocean basins. At the same time, sedimentary rocks compose only about 5% of lithosphere, so it is a very thin veneer. What are sedimentary basins? Sedimentary basins are holes filled with dirt, which was originally weathered rock (igneous, metamorphic, ...
... including some 75% of land areas and 100% of the ocean basins. At the same time, sedimentary rocks compose only about 5% of lithosphere, so it is a very thin veneer. What are sedimentary basins? Sedimentary basins are holes filled with dirt, which was originally weathered rock (igneous, metamorphic, ...
Introduction to Sedimentation and Stratigraphy
... including some 75% of land areas and 100% of the ocean basins. At the same time, sedimentary rocks compose only about 5% of lithosphere, so it is a very thin veneer. What are sedimentary basins? Sedimentary basins are holes filled with dirt, which was originally weathered rock (igneous, metamorphic, ...
... including some 75% of land areas and 100% of the ocean basins. At the same time, sedimentary rocks compose only about 5% of lithosphere, so it is a very thin veneer. What are sedimentary basins? Sedimentary basins are holes filled with dirt, which was originally weathered rock (igneous, metamorphic, ...
PDF format - gemoc - Macquarie University
... grains enclosed in concentrate-derived minerals from the Lac de Gras area, Slave craton, by electron microprobe, quadrupole laser ablation microprobe (LAM) ICPMS and multicollector LAM ICPMS, respectively. The in-situ method for the collection of Re-Os isotope data from individual sulfides removes m ...
... grains enclosed in concentrate-derived minerals from the Lac de Gras area, Slave craton, by electron microprobe, quadrupole laser ablation microprobe (LAM) ICPMS and multicollector LAM ICPMS, respectively. The in-situ method for the collection of Re-Os isotope data from individual sulfides removes m ...
AH ABSTRACT FORMATED
... Abu Hamamid Alaskan-type complex is located 100 km to the west of the Red Sea coast at the intersection of two major faults affecting low-grade volcanic rocks (Shadli Metavolcanics: 710 Ma, Stern et al., 1991). This area is a part of the Proterozoic Shield comprising metasedimentary and, metavolcani ...
... Abu Hamamid Alaskan-type complex is located 100 km to the west of the Red Sea coast at the intersection of two major faults affecting low-grade volcanic rocks (Shadli Metavolcanics: 710 Ma, Stern et al., 1991). This area is a part of the Proterozoic Shield comprising metasedimentary and, metavolcani ...
AN HYPOTHESIS ON THE ORIGIN OF ATKALINE ROCKS
... volatile pressure in the magmq and hence to lower its melting point. This factor by itself may be sufrcient to permit the melt to hurdle the thermal barrier. If it is not, and the melt crystallizes in the vicinity of the therrnal barrier, the process of desilication continues in the solid, so long a ...
... volatile pressure in the magmq and hence to lower its melting point. This factor by itself may be sufrcient to permit the melt to hurdle the thermal barrier. If it is not, and the melt crystallizes in the vicinity of the therrnal barrier, the process of desilication continues in the solid, so long a ...
East Africa`s Great Rift Valley: A Complex Rift System
... branches have developed, one to the west which hosts the African Great Lakes and another nearly parallel rift about 600 km to the east which nearly bisects Kenya north-to-south. • The East African Rift is referred to as “continental rifting” – a rifting process that occurs at continental setting. ...
... branches have developed, one to the west which hosts the African Great Lakes and another nearly parallel rift about 600 km to the east which nearly bisects Kenya north-to-south. • The East African Rift is referred to as “continental rifting” – a rifting process that occurs at continental setting. ...
Introduction to Geology - Research at UVU
... 2) Stocks: there are several in the Wasatch Mountains. The Alta Stock (makes up much of the Alta and Brighton ski resorts) and Little Cottonwood stocks (in the lower, western portion of Little Cottonwood Canyon) are probably the best-known. The “Temple Granite” used in the LDS SLC temple and meeting ...
... 2) Stocks: there are several in the Wasatch Mountains. The Alta Stock (makes up much of the Alta and Brighton ski resorts) and Little Cottonwood stocks (in the lower, western portion of Little Cottonwood Canyon) are probably the best-known. The “Temple Granite” used in the LDS SLC temple and meeting ...
Igneous rocks
... • Igneous rocks are classified as felsic, mafic, intermediate, and ultramafic, depending upon their mineral compositions. Felsic rocks such as granite are lightcolored, have high silica contents, and contain quartz and feldspars. Mafic rocks such as gabbro are dark-colored, have lower silica content ...
... • Igneous rocks are classified as felsic, mafic, intermediate, and ultramafic, depending upon their mineral compositions. Felsic rocks such as granite are lightcolored, have high silica contents, and contain quartz and feldspars. Mafic rocks such as gabbro are dark-colored, have lower silica content ...
The Development of Highly Strained Rocks in the Pelican Window
... a sedimentary origin for some of the subunits, not on the basis of their layered nature, but on account of their extensive uniformity and relatively fine grain size, the intimate association with the pe1itic rocks, the presence of discontinuous calc-silicate layers and pods as well as magnetite, and ...
... a sedimentary origin for some of the subunits, not on the basis of their layered nature, but on account of their extensive uniformity and relatively fine grain size, the intimate association with the pe1itic rocks, the presence of discontinuous calc-silicate layers and pods as well as magnetite, and ...
New Age Controls on Rock Units in pre
... al., 1990). An age of ca. 495 Ma was postulated based on petrological similarity to the Kellys Mountain and Cape Smoky plutons farther to the east and northeast in the Bras d’Or terrane (White et al., 1990). A small mafic pluton in the eastern Creignish Hills (Skye Mountain gabbro-diorite) has yield ...
... al., 1990). An age of ca. 495 Ma was postulated based on petrological similarity to the Kellys Mountain and Cape Smoky plutons farther to the east and northeast in the Bras d’Or terrane (White et al., 1990). A small mafic pluton in the eastern Creignish Hills (Skye Mountain gabbro-diorite) has yield ...
Open-File Report O-06-11, Preliminary Geologic Map of the Sexton
... crystalline. At least some contacts are depositional as seen a few kilometers to the north of the study area at the Gold Hill quarry. There large blocks and boulders of marble form clasts in adjacent (overlying?) quartzite and phyllite beds to the east. Outcrops of marble can only rarely be followed ...
... crystalline. At least some contacts are depositional as seen a few kilometers to the north of the study area at the Gold Hill quarry. There large blocks and boulders of marble form clasts in adjacent (overlying?) quartzite and phyllite beds to the east. Outcrops of marble can only rarely be followed ...
2.9: Nomenclature of sedimentary rocks
... changed in the course of time, for instance due to increased pressure as a result of burial under younger deposits to form lithified rocks. This restricted terminology will be used in this chapter, with the equivalent terms for sediments given between brackets where appropriate (for example, ‘sandst ...
... changed in the course of time, for instance due to increased pressure as a result of burial under younger deposits to form lithified rocks. This restricted terminology will be used in this chapter, with the equivalent terms for sediments given between brackets where appropriate (for example, ‘sandst ...
Geodynamic Significance of the Kontum Massif in
... the villages of Dak-Tô and Kontum (fig. 1) consists of amphibolites and granitoids more or less gneissified (Phan Cu Tien et al. 1988). To the west, these rocks are in fault contact over a slice of Kannack complex rocks; Neogene sediments cover the eastern contact. The rocks do not share any featur ...
... the villages of Dak-Tô and Kontum (fig. 1) consists of amphibolites and granitoids more or less gneissified (Phan Cu Tien et al. 1988). To the west, these rocks are in fault contact over a slice of Kannack complex rocks; Neogene sediments cover the eastern contact. The rocks do not share any featur ...
The late Paleozoic to Cainozoic intraplate deformation in
... clearly indicate a tensional regime. By most authors the Late Albian extension is viewed as a major rifting episode which finally formed the Palmyrides rift or aulacogene (Ponikarov et al., 1967; Lovelock, 1984; Chaimov et al., 1992). During the postrift subsidence up to 2500 m of marine, predominan ...
... clearly indicate a tensional regime. By most authors the Late Albian extension is viewed as a major rifting episode which finally formed the Palmyrides rift or aulacogene (Ponikarov et al., 1967; Lovelock, 1984; Chaimov et al., 1992). During the postrift subsidence up to 2500 m of marine, predominan ...
Coosa County
... than 50 percent of the minerals are aligned in thin, foliated layers and unlike schist (which is more strongly aligned), gneiss doesn't fracture along the planes of the mineral streaks. If the metamorphic conditions continue, gneisses can turn to migmatite and then totally recrystallize into granite ...
... than 50 percent of the minerals are aligned in thin, foliated layers and unlike schist (which is more strongly aligned), gneiss doesn't fracture along the planes of the mineral streaks. If the metamorphic conditions continue, gneisses can turn to migmatite and then totally recrystallize into granite ...
Nevado de Longaví Volcano (Chilean Andes, 36.2 ˚S): adakitic
... arcs related to subduction of cold oceanic lithosphere, where they have been explained in terms of remelting of basaltic material underplated at the base of thickened orogenic crust (e.g., Petford et al., 1996; Kay and Mpodozis, 2002) or as the result of modification of the sub-arc mantle related to ...
... arcs related to subduction of cold oceanic lithosphere, where they have been explained in terms of remelting of basaltic material underplated at the base of thickened orogenic crust (e.g., Petford et al., 1996; Kay and Mpodozis, 2002) or as the result of modification of the sub-arc mantle related to ...
Geology of the Alberts Lake Area (NTS 64K13SE and 14SW
... In the north part of Alberts Lake, mafic volcanic rocks are characterized by an abundance of fragmental rocks relative to massive flows; both rock types are typically amygdaloidal. The majority of both the fragmental and massive rocks contain 10 to 50% ovoid quartz amygdules (typically 0.1–1 cm), bu ...
... In the north part of Alberts Lake, mafic volcanic rocks are characterized by an abundance of fragmental rocks relative to massive flows; both rock types are typically amygdaloidal. The majority of both the fragmental and massive rocks contain 10 to 50% ovoid quartz amygdules (typically 0.1–1 cm), bu ...
Deep within the earth, hot, molten material called magma is formed
... Brainstorm the names of different types of rocks that the children may know. At this point it may be necessary to distinguish between natural rock and manufactured materials such as concrete that they call rock. Identify where rock is used in the environment, by looking a t some pictures or photogra ...
... Brainstorm the names of different types of rocks that the children may know. At this point it may be necessary to distinguish between natural rock and manufactured materials such as concrete that they call rock. Identify where rock is used in the environment, by looking a t some pictures or photogra ...
No Slide Title
... • They make up perhaps 95% of Earth’s crust – and account for about 1/3 of all known minerals ...
... • They make up perhaps 95% of Earth’s crust – and account for about 1/3 of all known minerals ...
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.