
Scientists from the Indian Institute of Geomagnetism (IIG), an autonomous institute of the Department of Science & Technology, Government of India, have tracked Climate change by following the Paleomonsoonal pattern of the subcontinent by harnessing magnetic mineralogy, a technique that is faster and more accurate than existing methods. Magnetic mineralogy is sensitive to changes in ambient chemical and physical processes that result in concentration, grain size, and mineralogy changes.
In the study published in the Sage Journal, Mr. Praveen Gawali and his team of researchers collated and conducted climatic and environmental studies by collecting sediment samples from different environments and climatic domains of India to glean out the information frozen in magnetic minerals in the form of magnetic parameters like magnetic susceptibility, anhysteretic remanent magnetization, saturation induced remanent magnetization, hysteresis loops, curie temperature.

The study of these changes unravels physicochemical regime operative in the past, helping to gauge the then prevalent climate pattern. The magnetic minerals are sensitive to physical and chemical environment that they are embedded in. These external changes bring about modifications in the innate structure of these magnetic minerals, transitioning them from one magnetic phase to another. In this process, the magnetic mineralogy also changes, for example, from magnetite to hematite and vice versa. There are also some intermediate phases that draw the attention of the researchers to complex climatic conditions prevalent over a period of time strictly from these magnetic phases.
Generally, the parent rocks from where the sediments are derived do not contain magnetic minerals that are more than 1% by total volume or weight of those rocks. The concentration of magnetic minerals is very low in sediments. However, this is sufficient to carry out climatic studies since these minerals reveal the true nature of climatic and environmental conditions prevalent at the time of their deposition. Once the instruments are installed in a lab (compared to other instruments, these are quite inexpensive), the overhead and maintenance charges are quite moderate, making the measurements, over the years, quite cheap. Additionally, the time taken is also very less. One of the magnetic parameters of a few hundred samples can be measured in a day. All these factors triggered interest at IIG to carry out climatic studies with the help of magnetic minerals.

Climate is changing at a rapid pace, impacted by natural and anthropogenic activity. The research will help forecast climatic changes with more accuracy and speed.
The forecast of this change has to be accurate and high levels of accuracy can be achieved if we go very far back in time. Thus the present study by IIG with the help of sediments and the accuracy with which the magnetic minerals freeze the environmental and climate conditions will help to screen many different domains in a much faster speed and with high levels of accuracy.
For more details, Mr. Praveen Gawali (pravin[at]iigs[dot]iigm[dot]res[dot]in) can be contacted.