Yellowstone sits above a spot in the Earth's mantle where columns of hot, molten rock called plumes rise to form volcanoes in the planet's crust. This spot is called a hotspot, and it creates atype of volcano not associated with a plate boundary. Yellowstone has produced three calderatypes...
There are not only north-south extrusions but also east-west extensions in the Tibetan Plateau. All these phenomena are the results of the Indian plate subducting into the Eurasia plate about 70 Ma地震学报(英文版)HongweiZheng2]RizhengHeXuanGuo...
rockfalls, landslides and mud-rock flows occur occasionally, are widely distributed on the medium-low mountains and hills in the northwestern Shunping with the area about 200 km2, accounting for 28.0% of the total county area; (3) The areas with low susceptibility, where earth fissures occur o...
The occurrences of moderate to large magnitude earthquakes and associated subsurface geological processes were critically examined in the backdrop of Indian plate obliquity, stress obliquity, topography, and the late Tertiary regional tectonics for understanding the evolving dynamics and kinematics in the ce...
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as well as Ti. Plots of Mg# versus SiO2indicate that the granite was derived from partial melting of crustal sources. Lithospheric delamination at the waning stage of the Pan-African Orogeny possibly triggered upwelling of hot mafic magma from the mantle which underplated the lower crust. This,...
rocks formed within the Earth's crust tend to contain higher concentrations of radioelements compared to those originating from the mantle. This disparity arises from processes like partial melting and fractionated crystallization, which concentrate these elements in the liquid phase of silica-rich magma...
Many ophiolites were produced and preserved in the Ural orogenic belt during the opening and closure of the Ural paleo–ocean in the Cambrian to Triassic and host a series of podiform chromite deposits. The Harzburgites and dunites dominate the mantle peridotites, which are outcropped in a ...
provinces form inboard, by delamination of mantle lithosphere, or plume impingement. Carlin and Carlin-like gold deposits develop at shallow crustal levels (<4 km) in extensional convergent margin continental arcs or back arcs; some provinces may involve asthenosphere plume impingement on the base of...
the character of the melting source region.The trace element composition of igneous zircon varies systematically with the trend of increasing trace element abundance in zircons from ultramafic through mafic to granitic rocks.Mantle-affinity zircons have lower trace element abundance,and the REE patterns...