Phase petrographic, thermobarometric and petrochemical significance of Cretaceous mafic dykes along Nongchram Fault Zone of Swangkre–Rongmil area of Shillong plateau, NE India: Implications for genetic link to Kerguelen mantle plume

2020 ◽  
Vol 129 (1) ◽  
Author(s):  
Niva Rani Devi
Keyword(s):  
Fault Zone ◽  
Mantle Plume ◽  
Shillong Plateau ◽  
Genetic Link ◽  
Mafic Dykes ◽  
Ne India

U–Pb baddeleyite ages, distribution and geochemistry of 925Ma mafic dykes and 900Ma sills in the North China craton: Evidence for a Neoproterozoic mantle plume

Lithos ◽  
2011 ◽  
Vol 127 (1-2) ◽  
pp. 210-221 ◽  
Author(s):  
Peng Peng ◽  
Wouter Bleeker ◽  
Richard E. Ernst ◽  
Ulf Söderlund ◽  
Vicki McNicoll
Keyword(s):  
Mantle Plume ◽  
North China Craton ◽  
North China ◽  
Mafic Dykes ◽  
The North

scholarly journals Variation of Vp/Vs ratios for granitic layers and weekly average number of earthquakes in NE India

MAUSAM ◽  
2022 ◽  
Vol 53 (4) ◽  
pp. 515-528
Author(s):  
UDAYAN GHOSH
Keyword(s):  
Shillong Plateau ◽  
Ne India ◽  
Phase Data ◽  
Seismic Area ◽  
Granitic Layer

Vp/Vs ratios for the granitic layers in Shillong Plateau and the partially overlapping Tezpur seismic area, have been calculated from Wadati diagrams drawn on the basis of seismic phase data.   From Shillong plateau the average of 23 readings for some months of 1979 for Vp/Vs is found to be 1.71.   For Tezpur area the average of 29 readings of Vp/Vs for 1991-92 is found to be 1.73, but for 1995-96, the average Vp/Vs from 49 readings is found to be 1.68. The overall average from 78 readings for this area is 1.70. The low Vp/Vs for 1995-97 seems to be precursory.   For the granitic layer, taking Vp = 5.92 kms/s and Vp/Vs = 1.70. We get Vs=3.48 km/s for NE India.   Values of Vp/Vs ratios and number of shocks per day are plotted against time and are shown to undergo sudden lowering before many M³4.2 earthquakes. Vp/Vs is generally lowered below 1.60 in such cases.   In Shillong plateau the number of shocks per day for 1979 is found to be three times the number in the adjoining Tezpur area, for 1991-97.

scholarly journals Deep geoelectric structure over the Lower Brahmaputra valley and Shillong Plateau, NE India using magnetotellurics

2008 ◽  
Vol 173 (1) ◽  
pp. 92-104 ◽  
Author(s):  
S. G. Gokarn ◽  
G. Gupta ◽  
D. Walia ◽  
S. S. Sanabam ◽  
Nitu Hazarika
Keyword(s):  
Shillong Plateau ◽  
Brahmaputra Valley ◽  
Ne India

Mantle plume: the dynamic setting of the origin of Early Paleozoic mafic dykes in Ziyang, Shaanxi Province, Southern Qinling Block, China

2020 ◽  
Vol 39 (3) ◽  
pp. 307-325
Author(s):  
Xiaoqing Chen ◽  
Shen Liu ◽  
Caixia Feng ◽  
Ian M. Coulson ◽  
Yan Fan ◽  
...  
Keyword(s):  
Mantle Plume ◽  
Shaanxi Province ◽  
Early Paleozoic ◽  
Mafic Dykes ◽  
Dynamic Setting
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