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Malsawma, J.
- Magnetostratigraphy of a Part of Middle Bhuban Sequence (Surma Group), Aizawl, Mizoram
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Authors
Affiliations
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
Source
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.- Magnetic Polarity Stratigraphy of the Bhuban Succession, Surma Group, Tripura-Mizoram Accretionary Belt
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Authors
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
Abstract Views :184 |
PDF Views:0
Authors
Affiliations
1 Department of Geology, Mizoram University, Aizawl - 796 004, IN
1 Department of Geology, Mizoram University, Aizawl - 796 004, IN