Sijin Kumar
A researcher interested in Reconstruction of the Indian monsoon variability during the late Quaternary period, Aragonitic pteropod preservation and Paleo-ocean acidification, Stable oxygen isotope studies of foraminifera and pteropods, Micropaleontological investigations from the marine sediments and their applications in paleoclimate studies and Environmental Impact Assessment of marine mineral resources.
Address: Sijin Kumar AV
Assistant Professor in Geology
Govt. college Kasaragod
Vidyanagar P.O
Kasaragod Dist.
Address: Sijin Kumar AV
Assistant Professor in Geology
Govt. college Kasaragod
Vidyanagar P.O
Kasaragod Dist.
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Papers by Sijin Kumar
systems at globally significant scales. One of the challenges
in attributing measured sediment loads to upstream mining
activities is establishing the source of sediments that are a
mixture of natural and mining-based materials. The environmental
magnetic data (mass-specific magnetic susceptibility,
anhysteretic remanent magnetisation, isothermal
remanent magnetisation and inter-parametric ratios) on 57
samples of suspended sediment from the Bhadra River in
the Sahyadri (the Western Ghat) of India have been used in
this study. Samples were collected upstream, adjacent to
and downstream of Kudremukh, a mountainous and high
rainfall site where the largest mechanised open-cast mine
in south Asia was located. Graphical and multivariate
analyses and modelling of the data show that on average
*29% of the river suspended load downstream of the mine
is derived from mining and allied activities at Kudremukh
although the mine occupies less than 5% of the catchment.
The contribution of primary ore is the maximum (18%),
followed by transitional hard weathered ore (7%) and
weathered ore (4%). The model has done a fairly good job
of unmixing; the sum of errors is \1 for 40 samples,
1–4,254 for five samples and [71,000 for four samples.
Modelling of samples with small mass seems to produce
large errors. This investigation demonstrates the utility of
environmental magnetic data, which can be obtained in a
simple and rapid manner, and the unmixing of such data in
identifying the contribution of mining activities to the total
suspended sediment load.
systems at globally significant scales. One of the challenges
in attributing measured sediment loads to upstream mining
activities is establishing the source of sediments that are a
mixture of natural and mining-based materials. The environmental
magnetic data (mass-specific magnetic susceptibility,
anhysteretic remanent magnetisation, isothermal
remanent magnetisation and inter-parametric ratios) on 57
samples of suspended sediment from the Bhadra River in
the Sahyadri (the Western Ghat) of India have been used in
this study. Samples were collected upstream, adjacent to
and downstream of Kudremukh, a mountainous and high
rainfall site where the largest mechanised open-cast mine
in south Asia was located. Graphical and multivariate
analyses and modelling of the data show that on average
*29% of the river suspended load downstream of the mine
is derived from mining and allied activities at Kudremukh
although the mine occupies less than 5% of the catchment.
The contribution of primary ore is the maximum (18%),
followed by transitional hard weathered ore (7%) and
weathered ore (4%). The model has done a fairly good job
of unmixing; the sum of errors is \1 for 40 samples,
1–4,254 for five samples and [71,000 for four samples.
Modelling of samples with small mass seems to produce
large errors. This investigation demonstrates the utility of
environmental magnetic data, which can be obtained in a
simple and rapid manner, and the unmixing of such data in
identifying the contribution of mining activities to the total
suspended sediment load.