Some events happened when Earth was younger and hotter that do not happen any more. Kimberlite pipes shot up from deep in the mantle. These pipes are the most important source of diamonds, which form at very high pressure. Most kimberlites surfaced long ago. The two most important things ab...
Measurements of the splitting or birefringence of seismic shear waves that have passed through the Earth's mantle yield constraints on the strength and geo... MD Long,PG Silver - 《Surveys in Geophysics》 被引量: 205发表: 2009年 Shear wave splitting and the pattern of mantle flow beneath eas...
Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan,China[J].Science in China Ser D-Earth Sciences,2004,(06):559-569.doi:10.1360/02yd0174.Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic...
Earth consists of four different layers: the inner core, the outer core, the mantle, and the crust. The other three layers have not yet been explored except for the crust. Layers of the Earth. Theis an extremely dense layer and is mostly made of iron and nickel. The radius of this so...
compare the proportions of land and water coverage on planet Earth and the proportions of salt water and fresh water, discuss the importance of temperature, atmospheric pressure, and gravity in creating our environment, describe the inner structure of Earth, including the crust, mantle, inner core...
The mean compositions of the basalts belong to the mild alkaline one, they are enriched in Fe.Ti and highly incompatible elements and the light rare earth elements especially. In Hongge and Baima intursions, Nd(t)1 and is approximately equal to the value of the original mantle. In ...
A guide to the chemical classification of the common volcanic rocks[J]. Canada Joural of Earth Science, 1971, 8(5):523-548. doi: 10.1139/e71-055 CrossRef Google Scholar [27] Sun S S, McDonough W F. Chemical and isotopic systematics of oceanic basalts: Implications formantle comp ...
the Gongjue area are the products of partial melting of the lower crust caused by the underplating of mantle-derived basic magma under the background of westward subduction of the Jinshajiang ancient oceanic crust, which is in the transition stage of subduction to collision.Combined with regional...
Major, trace and rare earth elements data of the Cretaceous Jindong granitic rocks were investigated in order to constrain the magma source characteristics and to establish the paleotectonic environment of the southwestern part of the Gyeongsang Basin. Geochemical signatures of the granitic rocks from...
mantleCoda envelope reflects heterogeneity in the Earth medium. Examining seismogram envelopes of regional earthquakes over the world in 1–20 s periods for a wide lapse time range up to 2000 s, we classified them focusing on the envelope characteristics around ScS arrivals. We found that coda ...