Results 71 to 80 of about 24,088 (309)
Open Geosciences, 2017 We examined the petrography, petrology, and geochemistry of two types of gabbroic xenoliths (A- and B-type xenoliths) in olivine basalt and biotite rhyolite units among the dominantly rhyolitic rocks in Niijima volcano, northern Izu-Bonin volcanic arc ...
Arakawa Yoji +5 more
doaj +1 more source
Production and loss of high-density batholithic root, southern Sierra Nevada, California [PDF]
, 2003 Eclogites are commonly believed to be highly susceptible to delamination and sinking into the mantle from lower crustal metamorphic environments. We discuss the production of a specific class of eclogitic rocks that formed in conjunction with the ...
Clemens-Knott, Diane +2 more
core +1 more source
Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.Abstract Dense sedimentary iron formations (IFs) subducted into the mantle during Earth's early history, may have descended to the core‐mantle boundary where they could exert strong control on its thermal and seismological properties. A key unanswered question is the extent to which IFs retain their oxidized character in the much more reducing mantle ...
Jemila A. Edmond +2 more
wiley +1 more source
MineralogiaPetrological observations and major elements analyses in olivine crystals in small xenoliths (>1.5 cm in diameter) from the Jeziorna locality, SW Poland, are presented.
Nowak Monika
doaj +1 more source
, 2007 International audienceInvestigation of an eclogite xenolith, discovered in a Cretaceous granite from the Central Domain of the Dabieshan massif in eastern China, yields new petrological insights into the high to ultrahigh-pressure metamorphism ...
Arnaud, Nicolas +4 more
core +4 more sources
Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.Abstract Since the Mesozoic, much of the eastern China lithosphere was removed through thermo‐mechanical erosion and delamination, yet the effects on the overlying crust remain unclear. The Tanlu Fault Zone (TLFZ), the region's largest lithosphere‐scale weakness, offers a natural laboratory to assess crustal responses to lithospheric destruction.
Yuqi Zhu +5 more
wiley +1 more source
Brazilian Journal of Geology, 2020 The Mesquita Sampaio beforsite is a mineral exploration area with apatite mineralization occurring near the northern portion of the Morro da Mina apatite deposit (Cajati Mine), in the Jacupiranga Alkaline Complex.
Saulo Batista de Oliveira +1 more
doaj +1 more source
Cryptic Paleomagnetic Complexity in the Ediacaran Egersund Dikes
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.Abstract The Ediacaran Period (∼635–539 Ma) represents a critical interval in Earth's evolution, yet its paleomagnetic record remains complex and contentious. One of the few Ediacaran paleomagnetic results from Baltica considered robust is a pole from the ca.
Yi Xue +5 more
wiley +1 more source
New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland [PDF]
, 2016 The Vaasa batholith, western Finland, is a large, peraluminous granitoid pluton that crystallized at 1.88-1.87 Ga during the culmination of the Svecofennian orogeny.
Hölttä, Pentti +4 more
core +2 more sources
Hornblendite in the Lower Crust: A Possible Source for Porphyry Cu Deposits
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.Abstract Lower crustal sulfide‐bearing Cu‐rich cumulates, mainly occurring as hornblendite, have been proposed as a critical source component for the development of giant porphyry Cu deposits (PCDs); however, their mineralogical and geochemical nature remain elusive.
Guangxu Li +5 more
wiley +1 more source