Results 171 to 180 of about 49,268 (212)
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Miocene high-temperature leucogranite magmatism in the Himalayan orogen
GSA Bulletin, 2020AbstractHimalayan leucogranites of Cenozoic age are generally attributed to partial melting of metasedimentary rocks at low temperatures of <770 °C. It is unknown what the spatial distribution and characteristics of high-temperature (>800 °C) leucogranites are in the Himalayan orogen.
Peng Gao +3 more
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Chapter 5.6 Syn- to Post-Orogenic Magmatism
2009Abstract Syn- to post-tectonic intrusive rocks occur in the Kaoko Belt, but only west of the Purros Lineament and in the Southern Kaoko Zone. In the Damara Belt, granites occur almost exclusively in the Central Zone with some extending into the Northern Zone.
Roy McG. Miller, Hartwig E. Frimmel
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Granitoid magmatism in the Qinling orogen, central China and its bearing on orogenic evolution
Science China Earth Sciences, 2015The Qinling orogen is a typical composite orogen for understanding multi-stages of magmatism and orogenic processes. Many studies have been carried out on the magmatic rocks in the Qinling orogen but their petrogenesis is still controversial. This paper presents a review of all granitoid rocks based on previous and new studies of geochronology and ...
XiaoXia Wang, Tao Wang, ChengLi Zhang
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Granitoid magmatism of Early Paleozoic orogens
Russian Geology and Geophysics, 2013Abstract Global manifestations of Early Paleozoic granite formation in the Central Asian Mobile Belt and some other orogenic areas worldwide are considered. The work is based on the author’s studies of Early Paleozoic granitoids from the Altai–Sayan and West Transbaikalian orogenic areas as well as abundant literature data on other world
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Magmatism, orogenic timing, and orogenic diachronism in the Cordillera from Mexico to Canada
Nature, 1974The distinction between the largely intra-Cretaceous Sevier orogeny and largely post-Cretaceous Laramide orogeny in the Cordillera between Montana and New Mexico does not exist in the northern Rocky Mountains of Montana and Canada and in the Cordillera of Mexico. An explanation of this in terms of the tectonics of the region is proposed.
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The Relation Between Magmatic Cycles and Orogenic Epochs
Geological Magazine, 1939Holmes, Kossmat, and Hess have independently pointed out that basic to ultrabasic rocks are characteristic of the axes of geosynclines, whereas acid rocks do not occur at that stage of development. Conversely, acid intrusives enter after the contents of the geosyncline have been folded.
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History of tectono-magmatic evolution in the Western Kunlun Orogen
Science in China Series D: Earth Sciences, 1999Based on the statistical and analytical data on more than 170 isotopic ages published since the 1980s of magmatic rocks, metamorphic rocks, tectonites and ores from the Western Kunlun Orogen, and the characteristics of sedimentation, magmatism, metamorphism and tectonic activities in the region studied in conjunction with geological field ...
Hua Bi +3 more
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Proterozoic anorogenic magmatism and its orogenic connections
Journal of the Geological Society, 1993There is a major belt of Proterozoic, so-called anorogenic, igneous rocks that extends from the Baltic Shield through southern Greenland and eastern Canada to southern USA. All rocks are situated within a zone of 1.9-1.6 Ga arc-accretionary orogens that consist of juvenile mantle-derived material especially accretionary prism sediments that provided ...
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Journal of Asian Earth Sciences, 2011
Abstract The Hercynian Tien Shan (Tianshan) orogen formed during Late Palaeozoic collision between the Karakum–Tarim and the Kazakhstan paleo-continents. In order to constrain timing of Hercynian post-collisional magmatism, 27 intrusions were sampled for U–Pb zircon dating along a ca. 2000 km – long profile in Uzbekistan and Kyrgyzstan.
Reimar Seltmann +4 more
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Abstract The Hercynian Tien Shan (Tianshan) orogen formed during Late Palaeozoic collision between the Karakum–Tarim and the Kazakhstan paleo-continents. In order to constrain timing of Hercynian post-collisional magmatism, 27 intrusions were sampled for U–Pb zircon dating along a ca. 2000 km – long profile in Uzbekistan and Kyrgyzstan.
Reimar Seltmann +4 more
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The role of crustal magmatism in the formation and the evolution of orogenic plateaus
Geological Society of America BulletinAbstract Here we review regional geological, petrological, geochemical, and geophysical data from the Central Andean plateau (comprising two distinct areas, the Altiplano and Puna) and its defunct North American sibling, the Nevadaplano, as well as to a lesser extent Tibet, to show that magmatism in the middle crust of orogenic ...
Mihai N. Ducea +7 more
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