نتایج جستجو برای: uplift and magmatism
تعداد نتایج: 16828102 فیلتر نتایج به سال:
The Central Andes are unique in the global system of subduction zones that a significant, high-altitude plateau has formed above zone. In this region, both and associated magmatism have been shown to vary space time. Geophysical data invaluable determining subsurface structure region. Extensive seismic studies determined regional-scale distribution partial melt crust upper mantle. Magnetotellur...
This contribution deals first new ICP-MS U–Pb zircon ages that indicate Middle- and Late Triassic magmatic episode tectonometamorphic events, respectively, for the central Patagonia region, instead of a Paleozoic history as previously estimated. The Calcatapul Formation consists (meta-) volcano-sedimentary syn-rift sequence deposited unconformably, shortly after extensional Gondwanide orogenic ...
To clarify the Holocene uplift history of the Izu Islands, Japan, we analyze the elevations and C ages of emerged sessile assemblages measured by accelerator mass spectrometry (AMS) on the islands of Niijima, Jinaijima, Shikinejima, and Kouzushima, on the northern Zenisu Ridge. The results suggest that uplift events took place after AD 1950 (uplift event 1), during AD 786–1891 (uplift event 2),...
Stratigraphic correlations presented here for the ductilely deformed and metamorphosed rocks exposed in the Shadow Mountains indicate that they formed on the North American continental margin and are not exotic or significantly displaced from their site of origin. These strata represent a depositional history that spans Late Proterozoic and Paleozoic passive margin development, late Paleozoic t...
The Yangtze Block records Neoproterozoic magmatism and sedimentation related to the breakup of Rodinia is an important piece in reconstruction supercontinent. However, tectonic setting position this block remain a subject debate. In present study, we report zircon U-Pb ages Hf isotopic composition geochemical Nd-Pb compositions for meta-volcanic rocks exposed Zhangbaling uplift NE Block. volcan...
Eruptive phenomena at all scales, from hydrothermal geysers to flood basalts, can potentially be initiated or modulated by external mechanical perturbations. We present evidence for the triggering of magmatism on a global scale by the Chicxulub meteorite impact at the Cretaceous-Paleogene (K-Pg) boundary, recorded by transiently increased crustal production at mid-ocean ridges. Concentrated pos...
Rifted continental margins are the product of stretching, thinning and ultimate break-up of a continental plate into smaller fragments, and the rocks lying beneath them store a record of this rifting process. Earth scientists can read this record by careful sampling and with remote geophysical techniques. These experimental studies have been complemented by theoretical analyses of continental e...
Uplift modeling is a classification method that determines the incremental impact of an action on a given population. Uplift modeling aims at maximizing the area under the uplift curve, which is the difference between the subject and control sets’ area under the lift curve. Lift and uplift curves are seldom used outside of the marketing domain, whereas the related ROC curve is frequently used i...
Abstract The Upper Cretaceous Fort Crittenden Formation exposed in the Santa Rita and Huachuca Mountains of southeastern Arizona is a syntectonic deposit that has been associated with Laramide tectonic activity. However, spatio-temporal relationships among sedimentation, magmatism, basement exhumation, possible flat slab-related processes southern region remain poorly understood. Age controls f...
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