scholarly journals Mantle Transition Zone Structure Beneath Northeast Asia From 2‐D Triplicated Waveform Modeling: Implication for a Segmented Stagnant Slab

2019 ◽  
Vol 124 (2) ◽  
pp. 1871-1888 ◽  
Author(s):  
Yujing Lai ◽  
Ling Chen ◽  
Tao Wang ◽  
Zhongwen Zhan
Keyword(s):  
Transition Zone ◽  
Northeast Asia ◽  
Zone Structure ◽  
Mantle Transition Zone ◽  
Waveform Modeling ◽  
Stagnant Slab

Mantle transition zone, stagnant slab and intraplate volcanism in Northeast Asia

2017 ◽  
pp. ggw491 ◽  
Author(s):  
Chuanxu Chen ◽  
Dapeng Zhao ◽  
You Tian ◽  
Shiguo Wu ◽  
Akira Hasegawa ◽  
...  
Keyword(s):  
Transition Zone ◽  
Northeast Asia ◽  
Mantle Transition Zone ◽  
Intraplate Volcanism ◽  
Stagnant Slab

Stagnant slab front within the mantle transition zone controls the formation of Cenozoic intracontinental high-Mg andesites in northeast Asia

Geology ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 19-24
Author(s):  
Wen-Liang Xu ◽  
Jia-Hui Chen ◽  
Ai-Hua Weng ◽  
Jie Tang ◽  
Feng Wang ◽  
...  
Keyword(s):  
Transition Zone ◽  
Northeast China ◽  
Earth Element ◽  
Northeast Asia ◽  
Light Rare Earth ◽  
Pb Isotope ◽  
Mantle Transition Zone ◽  
Isotopic Compositions ◽  
The Pacific ◽  
Stagnant Slab

Abstract The geochemistry of Cenozoic intracontinental high-Mg andesites (HMAs) in northeast Asia, together with regional geophysical data, offers an opportunity to explore the genetic relationship between the formation of intracontinental HMAs and subduction of the Pacific plate. Compared with primary HMAs in arcs, Cenozoic intracontinental HMAs in northeast Asia have lower Mg# [100 × Mg/(Mg + Fe2+)] values (53–56) and CaO contents (5.8–6.6 wt%), higher alkali (Na2O + K2O) contents (5.15–6.45 wt%), and enriched Sr-Nd-Hf isotopic compositions (87Sr/86Sr = 0.7056–0.7059; εNd = −4.9 to −3.4; εHf = −4.7 to −2.6) as well as lower Pb isotope ratios (206Pb/204Pb = 16.76–19.19; 207Pb/204Pb = 15.42–15.45; 208Pb/204Pb = 36.71–37.11). These Cenozoic intracontinental HMAs are similar to Cenozoic potassic basalts in northeast China with respect to their Sr-Nd-Pb-Hf isotopic compositions but have higher SiO2 and Al2O3 contents and lower K2O, MgO, and light rare earth element contents. These features indicate that these Cenozoic intracontinental HMAs originated from the mantle, where recycled ancient sediments and water contributed to partial melting of peridotite. Combined with the presence of a large low-resistivity anomaly derived from the mantle transition zone (MTZ) near these intracontinental HMAs, and their occurrence above the stagnant slab front within the MTZ (at 600 km depth) in northeast Asia, we conclude that the stagnant slab front, with high contents of recycled ancient sediments and water, has controlled the formation of Cenozoic intracontinental HMAs in northeast Asia.

scholarly journals Mantle transition zone structure beneath India and Western China from migration of PP and SS precursors

2014 ◽  
Vol 197 (1) ◽  
pp. 396-413 ◽  
Author(s):  
S. Lessing ◽  
C. Thomas ◽  
S. Rost ◽  
L. Cobden ◽  
D. P. Dobson
Keyword(s):  
Transition Zone ◽  
Western China ◽  
Zone Structure ◽  
Mantle Transition Zone ◽  
Ss Precursors

Lateral Variations of the Mantle Transition Zone Structure beneath Eastern China

2014 ◽  
Vol 104 (3) ◽  
pp. 1533-1539 ◽  
Author(s):  
H. Huang ◽  
P. Wang ◽  
N. Mi ◽  
Z. Huang ◽  
M. Xu ◽  
...  
Keyword(s):  
Transition Zone ◽  
Eastern China ◽  
Zone Structure ◽  
Mantle Transition Zone ◽  
Lateral Variations
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