Petrography and whole-rock geochemistry of Oligocene Barail Sandstones of Surma basin: Implications for tectono-provenance and paleoclimatic condition

The Oligocene Barail Sandstones of Surma basin from parts of Champhai District of Mizoram, northeast India has been studied for their tectono-provenance setting using petrography and geochemistry. The studied sandstones are poor to moderately sorted, subarkosic to sub-litharenite and show dominance...

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Bibliographic Details
Published in:Journal of Earth System Science 2020-12, Vol.129 (1), p.179, Article 179
Main Authors: Borgohain, Pradip, Hussain, M Faruque, Bezbaruah, Devojit, Vanthangliana, V, Phukan, Parakh Protim, Gogoi, Manash Pratim, Bharali, Bubul
Format: Article
Language:English
Subjects:
Aluminum oxide
Cement
Climatic conditions
Continental crust
Dominance
Earth and Environmental Science
Earth Sciences
Feldspars
Ferric oxide
Geochemistry
Geology
Granite
Mica
Oligocene
Petrography
Petrology
Quartz
Rare earth elements
Rocks
Sandstone
Sediment
Sediments
Silica
Silicon dioxide
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Stratigraphy
Titanium dioxide
Weathering
Zirconium
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Summary:The Oligocene Barail Sandstones of Surma basin from parts of Champhai District of Mizoram, northeast India has been studied for their tectono-provenance setting using petrography and geochemistry. The studied sandstones are poor to moderately sorted, subarkosic to sub-litharenite and show dominance of quartz (avg. 54.46%) followed by feldspars (avg. 7.22%), rock fragments (avg. 4.98%), mica (avg. 5.89%), matrix (avg. 14.47%) and cement (avg. 12.98%). Dominance of polycrystalline and undulatory monocrystalline quartz indicates contribution from medium grade metamorphic sources, primarily of granite gneisses. High concentration of SiO 2 with moderate to low concentration of Al 2 O 3 , Fe 2 O 3 , MgO, Na 2 O and K 2 O resembles the composition of upper continental crust. Moreover, moderate to high concentration of Th and V, depleted value of Ni along with TiO 2 /Zr suggests derivation of sediments from felsic sources. The ratios of Eu/Eu* (avg. 0.63) and La N /Lu N bears resemblance with the upper continental crust. Overall analyses show that the sediments were derived from the felsic terrain of neighbouring orogens probably represented by granite-gneisses and have undergone a moderate degree of weathering (avg. values of CIA: 70.20, CIW: 81.03, PIA: 77.63, WIP: 38.45, ICV: 1.06, I w = 2) in a semi-humid to humid climatic conditions [Q p /(F + RF):Q t /(F + RF) = 0.20].
ISSN:2347-4327
0253-4126
0973-774X
DOI:10.1007/s12040-020-01431-y