Earth, Atmosphere & Environment Sciences
Title : | Magnetostratigraphic and sedimentological studies of Tertiary rock in Mizoram. Northeast India. |
Area of research : | Earth, Atmosphere & Environment Sciences |
Principal Investigator : | Dr. Paul Lalnuntlaunga, Mizoram University, Mizoram |
Timeline Start Year : | 2022 |
Timeline End Year : | 2025 |
Contact info : | paultluanga@gmail.com |
Equipments : | "Geological Compass
Geological Hammer
Laptop
Printer
GPS" |
Details
Executive Summary : | The proposed study area is situated in the Assam Arakan Fold Belt and some term indo Burman ranges (IBR) in Mizoram. And it is the depo-centre for Surma Group of rocks. Quantification of depositional rates and absolute dating of the sediments themselves is quite complicated in the sediments of this region, as the fossil preservation here is poor and fauna are long ranging lacking diagnostic features. Or absent of volcanic layer to establish dating by radiochronology. That is why Magnetostratigraphy remains the best existing tool to date fossil–poor sediments and to work out precise Sediment Accumulation Rate (SAR). Sediments supply is a function of climate, source rock lithology and proximity to the sediments source. Abrupt or drastic change in the Sediment Accumulation Rate (SAR) could be the consequence of either change in sediment tectonic subsidence or influx or by a combination of both. Furthermore, by studying changes in the magnetic mineralogy of the sediments through time, we can learn further about changes in the sediments source. and how it is transported together with sedimentological studies. The GPS studies shown that the deformation and crustal shortening is about 4cm/year. The tectonic and the depositional history of this area are less studied. To facilitate constraint the uplift timing, we will perform magnetostratigraphic and rock magnetic studies together with exhaustive sedimentological studies. The rocks in this basin are of Shallow Marine molasses to fluvial-lacustrine sediments, which are well exposed in partially continuous form. The sediments in this basin record the erosional history of the rising Himalaya. By studying these sediments one can learnt details about mass transfer from the growing Himalaya to the surrounding basin(Bengal Basin and particularly Assam Arakan sub basin), which should mostly be a function of Climate and tectonic processes. The dramatic facies and sedimentation rate changes at times indicate, or reflects thrust loading. This kind of studies and data is very lacking for this sub basin and this studies will provide precise chronostratigraphy along with insight to the regional tectonic of the region. Moreover, In Himalayan Foreland basin, most of the this kind of study is performed in central and western region.(Yin et al 2006,2010. Cina et al 2009) The Eastern part is less studied and we must perform to pick up insight regarding the tectonic subsidence and for reconstructing the regional deformation. The Himalayan foreland basin in the eastern part and its exhumation history of eastern syntaxis, the evolution and pop-up of Shillong Plateau and geological history of Brahmaputra drainage system could give us immense knowledge. As a result, precise dating of sediments in the eastern Himalayan fore-land basin is very important and initial step in investigating the exhumation and contemporary climatic condition of this region. |
Total Budget (INR): | 25,04,832 |
Organizations involved