2 edition of Regional geology of early Precambrian high-grade metamorphic rocks in West Greenland found in the catalog.
Regional geology of early Precambrian high-grade metamorphic rocks in West Greenland
B. F. Windley
|Statement||by Brian F. Windley.|
|Series||Geological Survey of Greenland. Report, no. 46, Rapport (Grønlands geologiske undersøgelse) ;, nr. 46.|
|LC Classifications||QE70 .D43 no. 46, QE475.A2 .D43 no. 46|
|The Physical Object|
|LC Control Number||73173823|
occupies most of northeastern Canada, a large part of Greenland, parts of Lake Superior region (Minnesota, Wisconsin, and Michigan), and the Adirondack of New York Canadian Shield topography is subdued with numerous lakes and exposed Archean and Proterozoic rocks thinly covered in places by Pleistocene glacial deposits. The igneous and metamorphic rocks exposed in Rocky Mountain National Park are almost exclusively of Precambrian age. The lack of exposures of younger sediment in the park is due to the fact that: these sediments were present but were eroded as the result of multiple episodes of uplift.
The Earth is estimated to be approximately billion years old. The oldest rocks known are located in northern Quebec and date to billion years ago. These are part of Canada’s Precambrian shield, the ancient core of the North American continental landmass. Rocks more than billion years old are found on every continent. Precambrian rocks, undivided, unit 2 (Mojave Desert and Transverse Ranges) Precambrian rocks, undivided, unit 2 (Mojave Desert and Transverse Ranges) Geologic age: Early Proterozoic to Miocene: Lithologic constituents: Major Geologic map of the San Bernardino quadrangle, California: California Division of Mines and Geology, Regional.
Nutman AP, Friend CRL, Horie K, Hidaka H () The Itsaq gneiss complex of southern west Greenland and the construction of Archaean crust at convergent plate boundaries. In: Van Kranendonk MJ, Smithies RH, Bennett VC (eds) Earth’s oldest rocks, Developments in Precambrian geology. Elsevier, Amsterdam, pp – CrossRef Google Scholar. Norway, officially the Kingdom of Norway, is a Nordic country in Northwestern Europe whose territory comprises the western and northernmost portion of the Scandinavian Peninsula; the remote island of Jan Mayen and the archipelago of Svalbard are also part of the Kingdom of Antarctic Peter I Island and the sub-Antarctic Bouvet Island are dependent territories and thus not considered.
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Add tags for "Regional geology of early Precambrian high-grade metamorphic rocks in West Greenland,". Be the first. Lithologies Precambrian basement (– million years ago) Archean rocks (– billion years ago) The earliest geological units found in the Western Block are formed in Neoarchean, when the major crustal accretion and reworking took place.
The Neoarchean rocks in the Precambrian basement are mainly composed of greenstones, high-grade metamorphic rocks and granitoids. Author of The evolving continents, The Fiskenaesset Complex, West Greenland, A preliminary study of the stratigraphy, petrology, and whole rock chemistry from Qeqertarssuatsiaq, Superposed deformations of the Ketilidian gneisses in the Sardloq area, S.
Greenland, Tectonic Evolution of the Himalayas and Tibet (Royal Society Discussion Volumes), The Precambrian geology of the Sârdloq area Written works: The Evolving Continents.
Metamorphic rock - Metamorphic rock - Regional metamorphism: Regional metamorphism is associated with the major events of Earth dynamics, and the vast majority of metamorphic rocks are so produced.
They are the rocks involved in the cyclic processes of erosion, sedimentation, burial, metamorphism, and mountain building (orogeny), events that are all related to major convective. Precambrian - Precambrian - Precambrian geology: By international agreement, Precambrian time is divided into the Archean Eon (occurring between roughly billion years ago and billion years ago) and Proterozoic Eon (occurring between billion and million years ago).
After the Precambrian, geologic time intervals are commonly subdivided on the basis of the fossil record. (2) There is no correlation between regional metamorphic grade and proximity to plutons (Fig. (3) There appears to be a relationship between degree of metamorphism and abundance of pegmatites.
Pegmatites are most abundant in high-grade rocks (Zone 5 of Fig. 8), and are completely absent in the areas where the second metamor- phism is very weak.
Zircon U–Pb dating demonstrates that these high-grade metamorphic rocks underwent three-stages of tectono-thermal events, i.e.
the early Paleoproterozoic magmatic event at ca. Ma, the late Paleoproterozoic metamorphic event at – Ma and the early Neoproterozoic metamorphic event at – Ma (Dong et al.,Zhang et al.
Nigeria lies to the rest of the West African Craton in the region of late Precambrian to early Paleozoic orogenesis. The Basement complex is made up of Precambrian rocks and these rocks consist of the schist belt infolded in them.
The Precambrian rocks in the study area are part of the Precambrian. The Precambrian rocks in Grand Teton National Park on the east flank of the Teton Range are being studied by the author. The geologic map (pl. 1) of this part of the Precambrian complex and the following descriptions are based largely on his unpublished data and on brief published descriptions by Horberg and Fryxell (), Bradley (), and.
Braddock, W.A., and Cole, J.C.,Precambrian structural relations metamorphic grade, and intrusive rocks along the northeast flank of the Front Range in the Thompson Canyon, Poudre Canyon, and Virginia Dale areas: Field Guide, Geological Society of America Rocky Mountain section, p.
The geology of Cambodia is the study of the nation's rocks, minerals, water and landforms. Cambodia's ancient geologic history in the Precambrian is poorly understood.
The region experienced tectonic activity and low-grade metamorphic rock formation throughout the Paleozoic, which a shift to marine conditions and fossil formation during the Permian and through much of the Mesozoic. Early Cambrian metamorphic zircon in the northern Pinjarra Orogen: Implications for the structure of the West Australian Craton margin REGIONAL GEOLOGY AND GEOCHRONOLOGY.
suggesting growth with garnet in high-grade rocks (Rubatto, ). Notably, the concordant Archean zircon grain shows a steeper HREE trend, strong depletion of Pr, and.
Early Precambrian rocks in the Eastern European Platform basement overlain by a sedimentary cover are being directly studied by deep drilling. Unfortunately, the network of deep holes is insufficiently dense, and the cores of holes drilled a few decades ago were far from adequately fully documented and examined, and most were irrevocably lost.
REGIONAL PRECAMBRIAN GEOLOGY The Precambrian geology of the western part of the Granite Mountains (Tps. N., Rs. W.) is shown in figure 2. Three major terranes or lithologies are readily differentiated: (1) An assemblage of amphibolite-grade metamorphic rocks crops out in the northwestern and.
Metamorphic rocks are made by either heating up or squashing the earth's crust. They are often found in mountainous regions. One example is slate. Slate was originally a black mud laid down on the bottom of the sea or lake. Fossils can sometimes be found in it but they are often squashed. Other common metamorphic rocks are called marble, gneiss.
Dickens North American Precambrian geology ICC Figure 1. Generalized map showing North America and Greenland’s major Precambrian provinces (with platform cover removed) and their principal rock types (after Mints, ).
MR = Midcontinent Rift. B =. Complex of Precambrian igneous and metamorphic rocks. Mostly gneiss and schist intruded by igneous rocks; may be Mesozoic in part.
California: California Division of Mines and Geology, Regional Geologic Map Series, Map 3A, scaleGeologic and geochronologic reconnaissance of the Turtle Mountains area, California: west border. Western Canada during the Precambrian Laurentia extends as far west as eastern B.C.
(Figure ), but the ancient rocks of the craton are almost completely covered by younger rocks in B.C., Yukon, and all of Alberta except the far northeast corner. Regional geology.
The Adola granite-greenstone terrane covers an area of approxi- Precambrian rocks from southern and eastern Ethiopia: Im- (ANS) to the north and the high-grade.
date back billion years. The parent rocks include sedimentary shale, sandstone interbedded with volcanic granites. The Precambrian orogeny that created the Ancient Rockies increased tectonic activity, compressed, folded, uplifted and metamorphosed the parent rocks into a variety of metamorphic schist and gneiss rocks.
Regional metamorphism occurs when rocks are buried deep in the crust. This is commonly associated with convergent plate boundaries and the formation of mountain ranges. Because burial to 10 km to 20 km is required, the areas affected tend to be large.
Most regional metamorphism takes place within continental crust. These rocks are Early Proterozoic in age and mapped as Precambrian X (Leighty and others, ); however, in the current stratigraphic terminology X refers to rocks of the Paleoproterozoic with ages ranging from about Ga to Ga.
Again, the Ga refers to billions of years before present.Regional metamorphism of the Early P alaeozoic Greenland Group, South Westland, New Zealand, New Zealand Journal of Geology and Geophysics, DOI: /