SS

Sandeep Singh

IIT Roorkee, Indian Institute of Technology Roorkee, University of Lucknow

ORCID iD 0000-0002-3440-6127
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About

My work involves integration of field, petrology, geochemistry and U-Pb geochronology data set by Isotope Geochemistry and mineral chemistry using Sensitive High mass Resolution Ion MicroProbe (SHRIMP), conventional Thermal Ionization Mass Spectrometer (TIMS), ICP-MS and EPMA. I am also involved in routinely analyzing Sr, Rb, Nd and Sm isotopes at the National Facility on Geochronology/Isotope Geology, IIT Roorkee on rocks, minerals, water, sediments and biogenic materials along with upkeeping of the facility.

My significant research contributions to Earth and Planetary Sciences deal with the timing of various Himalayan tectonic events related to pre-Himalayan deformation, transpressional tectonics within Karakoram, timing of India-Asia collision and late stage exhumation. The details of these contributions are given belwo:

(i) Pre-Himalayan Events: High-resolution ages of the Pre-Himalayan granitoids by U-Pb zircon dating, using both conventional TIMS and SHRIMP reveal widespread magmatism during Mesoproterozoic (~2000 Ma) and Paleoproterozoic (~1856 Ma) granitoids, which intrude pelitic-psammatic basal sequence of the Higher Himalayan Crystallines (HHC) and within Plate domain. After this event Neoproterozoic (825 Ma) bodies have also been emplaced up in north and thrust over towards south, these bodies were earlier thought to be a part of widespread Cambro-Ordocian Pan-African event. During the analysis it has also been established how SHRIMP is having advantage over conventional TIMS analysis. This study led many people believe that the Neoproterozoic zircons from the detritus don’t have to come all the way from African continent when we have source within the domain.

(ii) Transpressional Tectonics: High resolution U-Pb zircon SHRIMP ages from the transpressional Karakoram Shear zone granitoids undoubtedly revealed the initial suturing of the southern Asian Plate margin with India at ~ 70 Ma, prior to which happens to be prior to the collision between India and Asia in the Himalaya.

(iii) India – Asia Collision: The timing of the India-Asia collision has been attempted by SHRIMP U-Pb zircon dating of subduction-related Ladakh Batholith at 60.1 ± 0.9 Ma and eclogites facies Indian continental granitoids at 53.7 ± 0.7 Ma, therby constraining the timing of collision to be no later than 57 Ma.

(iv) Late Stage Exhumation: Rb-Sr thermochronology by TIMS on biotite and muscovite constrain the late stage exhumation in the Himalaya and Karakoram during 20 – 12 Ma.

(v) Crustal melt generation: U-Pb dating of core and rim growths on zircons by SHRIMP from Himalayan and Karakoram granitoids have revealed crustal melting and leucogranite generation between 46 Ma to 19 Ma in episodic manner. Granite melts appear to have been generated episodically, and segregated, transferred and emplaced due to decompressional melting within earth’s crust along the late stage extensional fabric as a consequence of India-Asia collision.

Employment

  • IIT Roorkee Joint Faculty
    2024 - Present
  • Indian Institute of Technology Roorkee Professor (HAG)
    2019 - Present
  • Indian Institute of Technology Roorkee Professor
    2009 - Present
  • Indian Institute of Technology Roorkee Associate Professor
    2006 - 2009
  • Indian Institute of Technology Roorkee Assistant Professor
    1996 - 2006
  • Indian Institute of Technology Roorkee Research Scientist B
    1989 - 1996

Education

  • Indian Institute of Technology Roorkee Ph.D.
    1987 - 1993
  • Indian Institute of Technology Roorkee M.Tech. (Applied Geology)
    1984 - 1987
  • University of Lucknow B.Sc.
    1982 - 1984

Projects & Funding

Projects & funding information is unavailable.

Publications (95)