Palaeomagnetic and geochemical characteristics of the Rajmahal Traps, eastern India

1996 ◽  
Vol 13 (2) ◽  
pp. 113-122 ◽  
Author(s):  
G.V.S. Poornachandra Rao ◽  
J. Mallikharjuna Rao ◽  
M.V. Subba Rao
Keyword(s):  
Geochemical Characteristics ◽  
Eastern India ◽  
Rajmahal Traps

scholarly journals Nature of Cretaceous dolerite dikes with two distinct trends in the Damodar Valley, eastern India: Constraints on their linkage to mantle plumes and large igneous provinces from 40Ar/39Ar geochronology and geochemistry

Lithosphere ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 40-52 ◽  
Author(s):  
Rajesh K. Srivastava ◽  
Fei Wang ◽  
Wenbei Shi ◽  
Anup K. Sinha ◽  
Kenneth L. Buchan
Keyword(s):  
Sedimentary Basins ◽  
Geochemical Characteristics ◽  
Large Igneous Province ◽  
Mantle Plumes ◽  
Eastern India ◽  
Group I ◽  
Igneous Provinces ◽  
Damodar Valley ◽  
Igneous Province ◽  
Reunion Plume

Abstract Two distinct sets of Cretaceous dolerite dikes intrude the Chhotanagpur gneissic complex of eastern India, mostly within the Damodar Valley Gondwanan sedimentary basins. One dike set trends NNE to ENE, whereas the other set, which includes the prominent Salma dike, trends NW to NNW. One dike from each set in the Raniganj Basin was dated using the 40Ar/39Ar method in order to resolve a controversy concerning the emplacement age of the Salma dike. The NE-trending dike yielded a plateau age of 70.5 ± 0.9 Ma, whereas the NNW-trending Salma dike is much older, with a plateau age of 116.0 ± 1.4 Ma. These results demonstrate that the Salma dike was emplaced at ca. 116 Ma and not at ca. 65 Ma, as suggested in an earlier study. Geochemical characteristics of the two dikes are also distinct and indicate that they belong to previously identified high-Ti and low-Ti dolerite groups, respectively. The observed geochemical characteristics of both dike sets are comparable with the geochemistry of basalts of the Kerguelen Plateau, Bunbury Island, and Rajmahal Group I and suggest a connection to mantle plumes. The new age data presented herein indicate that these two magmatic episodes in the eastern Indian Shield were related to the ca. 120–100 Ma Kerguelen mantle plume and its associated Greater Kerguelen large igneous province and the ca. 70–65 Ma Réunion plume and its associated Deccan large igneous province, respectively.

Remanent Magnetism of the Rajmahal Traps of North-Eastern India

Nature ◽  
1958 ◽  
Vol 181 (4612) ◽  
pp. 830-831 ◽  
Author(s):  
J. A. CLEGG ◽  
C. RADAKRISHNAMURTY ◽  
P. W. SAHASRABUDHE
Keyword(s):  
Eastern India ◽  
Remanent Magnetism ◽  
North Eastern ◽  
Rajmahal Traps ◽  
North Eastern India
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