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Tiwari, R. P.
- National Field Workshop in the Neogene Succession of Mizoram
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 2 (2008), Pagination: 288-288Abstract
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- Magnetostratigraphy of a Part of Middle Bhuban Sequence (Surma Group), Aizawl, Mizoram
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1 Department of Geology, Mizoram University, Aizawl - 796009, IN
2 Wadia Institute of Himalayan Geology, 33 General Mahadev Singh Road, Dehradun - 248 001, IN
1 Department of Geology, Mizoram University, Aizawl - 796009, IN
2 Wadia Institute of Himalayan Geology, 33 General Mahadev Singh Road, Dehradun - 248 001, IN
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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 4 (2007), Pagination: 667-674Abstract
A 560 m thick rock succession of Middle Bhuban Formation (Surma Group) exposed between Bawngkawn and Durtlang, Aizawl, Mizoram has been studied for its magnetostratigraphic attributes. A total of 7 normal and 7 reverse magneto-Zones have been delineated in this section. The GPTS correlated ages of this section lie between -21.77 Ma (at the base) to ∼15.16 Ma (at the top) with a total duration of ∼6.6 Ma. The GPTS event C6n occurring at the stratigraphic level between 146 m to 266 m may be considered for basin wide correlation as it is the longest normal event that has been recorded with greater confidence i. e. better alpha- 95. The average sediment accumulation rate (SAR) estimated for this section is 8.48 cm/Ka. Overall the SAR is higher in the lower part of the section with a spike of 26.8 cm/Ka at <21 Ma. The decrease in SAR to 2.1 cm/Ka at around 18 Ma in the upper part of the section may be investigated for possible hiatus.Keywords
Magnetostratigraphy, Sediment Accumulation Rate (SAR), Surma Group, Middle Bhuban Formation, Aizawl, Mizoram.
- Discussion meet on Magnetostratigraphy and Palaeomagnetism
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Affiliations
1 Department of Geology, Mizoram university,Aizawl - 796 012, Mizoram, IN
2 Wadia Institute of Himalayan, Geology, Dehra Dun - 245 001, Uttarachal, IN
3 Indian Institute of Geomagnatism, Magnetic Observatory, Alibagh, Raigarh, IN
4 ESS Division, Dept of Science & Technology, New Delhi, IN
1 Department of Geology, Mizoram university,Aizawl - 796 012, Mizoram, IN
2 Wadia Institute of Himalayan, Geology, Dehra Dun - 245 001, Uttarachal, IN
3 Indian Institute of Geomagnatism, Magnetic Observatory, Alibagh, Raigarh, IN
4 ESS Division, Dept of Science & Technology, New Delhi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 4 (2005), Pagination: 511-513Abstract
No Abstract.Full Text
- Magnetic Polarity Stratigraphy of the Bhuban Succession, Surma Group, Tripura-Mizoram Accretionary Belt
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Affiliations
1 Department of Geology, Mizoram University, Aizawl - 796 009, IN
2 Department of Geology, University of Pune, Pune - 411 007, IN
1 Department of Geology, Mizoram University, Aizawl - 796 009, IN
2 Department of Geology, University of Pune, Pune - 411 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 2 (2010), Pagination: 119-133Abstract
A 1355 m thick Bhuban sequence exposed along Tuirial section in the Aizawl district, Mizoram has been studied for magnetostratigraphic and rock magnetic attributes. The study reveals mono-mineral nature of the rocks with magnetite in the range of Stable Single Domain (SSD) showing the most favourable mineralogy to produce authentic (Natural Remanent Magnetization) NRM directions. Using routine demagnetization methods we reveal a total of 7 normal magneto-zones in the studied part of the Tuirial section. Correlation of the observed polarity with GPTS gives ages ~12.5 Ma to ~8 Ma. A notable increase in the rate of sedimentation at ~9.5 Ma (~750 m level in the section) indicates facies change from turbidite like sequence to pro-delta system. Detailed sedimentologic work is under progress to relate the magnetostratigraphy to understand some of the basin evolutionary processes.Keywords
Magnetic Polarity Stratigraphy, Magnetic Mineralogy, Sediment Accumulation Rate, Bhuban Succession, Surma Group, Tuirial Section, Mizoram.- Selachian Fishes from Bhuban Formation, Surma Group, Aizawl, Mizoram
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Affiliations
1 Department of Geology, Mizoram University, Aizawl - 796 004, IN
1 Department of Geology, Mizoram University, Aizawl - 796 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 77, No 4 (2011), Pagination: 328-348Abstract
An interesting selachian fish assemblage having stratigraphic and palaeoecological significance is being described from the two intraformational calcareous conglomeratic horizons within the Upper Bhuban unit of Bhuban Formation, Surma Group (Lower to Middle Miocene). The assemblage consists of eighteen species of selachian fishes including two new ones (Carcharhinus bhubanicus and Hemipristis unidenticulata) belonging to thirteen genera and another thirteen forms have been identified up to generic level. It is dominated by the families Carcharhinidae and Lamnidae, and is one of the most diversified Miocene assemblages from the Indian subcontinent. The fish fauna and the associated mega-invertebrates suggest Lower Miocene (Aquitanian - Burdigalian) age for the Upper Bhuban unit of Bhuban Formation. These further suggest that the fish yielding horizons were deposited under a warm shallow marine set-up near to the shoreline in a high-energy environment.Keywords
Selachian Fauna, Lower Miocene, Bhuban Formation, Surma Group, Mizoram.- Coralline Algae from the Prang Formation (Middle-Late Eocene) of the Lumshnong Area, Jaintia Hills, Meghalaya
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Authors
Affiliations
1 Botany of Department, University of Lucknow, Lucknow - 226 007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
3 Department of Geology, Mizoram University, Aizawl – 796 009, IN
1 Botany of Department, University of Lucknow, Lucknow - 226 007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
3 Department of Geology, Mizoram University, Aizawl – 796 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 4 (2011), Pagination: 355-364Abstract
The present paper records nine species of coralline algae from the Prang Formation of middle-late Eocene age from the Jaintia Hills, Meghalaya. The algae are associated with the larger foraminifera including Nummulites, Alveolina and Discocyclina throughout the succession. The temporal distribution of algal species indicates that seven species are known from the Eocene. Of the remaining two, one ranges from the Palaeocene to Eocene and the other is Palaeocene in age. The coralline algae and larger foraminifers are differentiated into two associations, the lower one indicating inner-ramp environment of high energy and the upper one showing deposition in relatively calm waters of deeper ramp environment.Keywords
Coralline Algae, Larger Foraminifera, Middle-Late Eocene, Jaintia Hills, Meghalaya.References
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