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    Rights statement: An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union. Grujic, D., Govin, G., Barrier, L., Bookhagen, B., Coutand, I., Cowan, B., et al. (2018). Formation of a rain shadow: O and H stable isotope records in authigenic clays from the Siwalik Group in eastern Bhutan. Geochemistry, Geophysics, Geosystems, 19, 3430–3447. https://doi.org/10.1029/2017GC007254

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Formation of a Rain Shadow: O and H Stable Isotope Records in Authigenic Clays From the Siwalik Group in Eastern Bhutan

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Formation of a Rain Shadow : O and H Stable Isotope Records in Authigenic Clays From the Siwalik Group in Eastern Bhutan. / Grujic, D.; Govin, Gwladys; Barrier, L.; Bookhagen, B.; Coutand, I.; Cowan, B.; Hren, M.T.; Najman, Yani.

In: Geochemistry, Geophysics, Geosystems, Vol. 19, No. 9, 09.2018, p. 3430-3447.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Grujic, D, Govin, G, Barrier, L, Bookhagen, B, Coutand, I, Cowan, B, Hren, MT & Najman, Y 2018, 'Formation of a Rain Shadow: O and H Stable Isotope Records in Authigenic Clays From the Siwalik Group in Eastern Bhutan', Geochemistry, Geophysics, Geosystems, vol. 19, no. 9, pp. 3430-3447. https://doi.org/10.1029/2017GC007254

APA

Grujic, D., Govin, G., Barrier, L., Bookhagen, B., Coutand, I., Cowan, B., Hren, M. T., & Najman, Y. (2018). Formation of a Rain Shadow: O and H Stable Isotope Records in Authigenic Clays From the Siwalik Group in Eastern Bhutan. Geochemistry, Geophysics, Geosystems, 19(9), 3430-3447. https://doi.org/10.1029/2017GC007254

Vancouver

Grujic D, Govin G, Barrier L, Bookhagen B, Coutand I, Cowan B et al. Formation of a Rain Shadow: O and H Stable Isotope Records in Authigenic Clays From the Siwalik Group in Eastern Bhutan. Geochemistry, Geophysics, Geosystems. 2018 Sep;19(9):3430-3447. https://doi.org/10.1029/2017GC007254

Author

Grujic, D. ; Govin, Gwladys ; Barrier, L. ; Bookhagen, B. ; Coutand, I. ; Cowan, B. ; Hren, M.T. ; Najman, Yani. / Formation of a Rain Shadow : O and H Stable Isotope Records in Authigenic Clays From the Siwalik Group in Eastern Bhutan. In: Geochemistry, Geophysics, Geosystems. 2018 ; Vol. 19, No. 9. pp. 3430-3447.

Bibtex

@article{b0db7a6bb27445f3a83ce9bbf0e35cc2,
title = "Formation of a Rain Shadow: O and H Stable Isotope Records in Authigenic Clays From the Siwalik Group in Eastern Bhutan",
abstract = "We measure the oxygen and hydrogen stable isotope composition of authigenic clays from Himalayan foreland sediments (Siwalik Group), and from present day small stream waters in eastern Bhutan to explore the impact of uplift of the Shillong Plateau on rain shadow formation over the Himalayan foothills. Stable isotope data from authigenic clay minerals (<2 μm) suggest the presence of three paleoclimatic periods during deposition of the Siwalik Group, between ∼7 and ∼1 Ma. The mean δ18O value in paleometeoric waters, which were in equilibrium with clay minerals, is ∼2.5‰ lower than in modern meteoric and stream waters at the elevation of the foreland basin. We discuss the factors that could have changed the isotopic composition of water over time and we conclude that (a) the most likely and significant cause for the increase in meteoric water δ18O values over time is the “amount effect,” specifically, a decrease in mean annual precipitation. (b) The change in mean annual precipitation over the foreland basin and foothills of the Himalaya is the result of orographic effect caused by the Shillong Plateau's uplift. The critical elevation of the Shillong Plateau required to induce significant orographic precipitation was attained after ∼1.2 Ma. (c) By applying scale analysis, we estimate that the mean annual precipitation over the foreland basin of the eastern Bhutan Himalayas has decreased by a factor of 1.7–2.5 over the last 1–3 million years. {\textcopyright}2018. American Geophysical Union. All Rights Reserved.",
keywords = "authigenic clay, foreland basin, Himalaya, orographic precipitation, Siwaliks, stable isotope, Isotopes, Rain, Authigenic clays, Foreland basin, Himalayas, Orographic precipitation, Stable isotopes, Clay minerals",
author = "D. Grujic and Gwladys Govin and L. Barrier and B. Bookhagen and I. Coutand and B. Cowan and M.T. Hren and Yani Najman",
note = "An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union. Grujic, D., Govin, G., Barrier, L., Bookhagen, B., Coutand, I., Cowan, B., et al. (2018). Formation of a rain shadow: O and H stable isotope records in authigenic clays from the Siwalik Group in eastern Bhutan. Geochemistry, Geophysics, Geosystems, 19, 3430–3447. https://doi.org/10.1029/2017GC007254",
year = "2018",
month = sep,
doi = "10.1029/2017GC007254",
language = "English",
volume = "19",
pages = "3430--3447",
journal = "Geochemistry, Geophysics, Geosystems",
issn = "1525-2027",
publisher = "John Wiley & Sons, Ltd",
number = "9",

}

RIS

TY - JOUR

T1 - Formation of a Rain Shadow

T2 - O and H Stable Isotope Records in Authigenic Clays From the Siwalik Group in Eastern Bhutan

AU - Grujic, D.

AU - Govin, Gwladys

AU - Barrier, L.

AU - Bookhagen, B.

AU - Coutand, I.

AU - Cowan, B.

AU - Hren, M.T.

AU - Najman, Yani

N1 - An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union. Grujic, D., Govin, G., Barrier, L., Bookhagen, B., Coutand, I., Cowan, B., et al. (2018). Formation of a rain shadow: O and H stable isotope records in authigenic clays from the Siwalik Group in eastern Bhutan. Geochemistry, Geophysics, Geosystems, 19, 3430–3447. https://doi.org/10.1029/2017GC007254

PY - 2018/9

Y1 - 2018/9

N2 - We measure the oxygen and hydrogen stable isotope composition of authigenic clays from Himalayan foreland sediments (Siwalik Group), and from present day small stream waters in eastern Bhutan to explore the impact of uplift of the Shillong Plateau on rain shadow formation over the Himalayan foothills. Stable isotope data from authigenic clay minerals (<2 μm) suggest the presence of three paleoclimatic periods during deposition of the Siwalik Group, between ∼7 and ∼1 Ma. The mean δ18O value in paleometeoric waters, which were in equilibrium with clay minerals, is ∼2.5‰ lower than in modern meteoric and stream waters at the elevation of the foreland basin. We discuss the factors that could have changed the isotopic composition of water over time and we conclude that (a) the most likely and significant cause for the increase in meteoric water δ18O values over time is the “amount effect,” specifically, a decrease in mean annual precipitation. (b) The change in mean annual precipitation over the foreland basin and foothills of the Himalaya is the result of orographic effect caused by the Shillong Plateau's uplift. The critical elevation of the Shillong Plateau required to induce significant orographic precipitation was attained after ∼1.2 Ma. (c) By applying scale analysis, we estimate that the mean annual precipitation over the foreland basin of the eastern Bhutan Himalayas has decreased by a factor of 1.7–2.5 over the last 1–3 million years. ©2018. American Geophysical Union. All Rights Reserved.

AB - We measure the oxygen and hydrogen stable isotope composition of authigenic clays from Himalayan foreland sediments (Siwalik Group), and from present day small stream waters in eastern Bhutan to explore the impact of uplift of the Shillong Plateau on rain shadow formation over the Himalayan foothills. Stable isotope data from authigenic clay minerals (<2 μm) suggest the presence of three paleoclimatic periods during deposition of the Siwalik Group, between ∼7 and ∼1 Ma. The mean δ18O value in paleometeoric waters, which were in equilibrium with clay minerals, is ∼2.5‰ lower than in modern meteoric and stream waters at the elevation of the foreland basin. We discuss the factors that could have changed the isotopic composition of water over time and we conclude that (a) the most likely and significant cause for the increase in meteoric water δ18O values over time is the “amount effect,” specifically, a decrease in mean annual precipitation. (b) The change in mean annual precipitation over the foreland basin and foothills of the Himalaya is the result of orographic effect caused by the Shillong Plateau's uplift. The critical elevation of the Shillong Plateau required to induce significant orographic precipitation was attained after ∼1.2 Ma. (c) By applying scale analysis, we estimate that the mean annual precipitation over the foreland basin of the eastern Bhutan Himalayas has decreased by a factor of 1.7–2.5 over the last 1–3 million years. ©2018. American Geophysical Union. All Rights Reserved.

KW - authigenic clay

KW - foreland basin

KW - Himalaya

KW - orographic precipitation

KW - Siwaliks

KW - stable isotope

KW - Isotopes

KW - Rain

KW - Authigenic clays

KW - Foreland basin

KW - Himalayas

KW - Orographic precipitation

KW - Stable isotopes

KW - Clay minerals

U2 - 10.1029/2017GC007254

DO - 10.1029/2017GC007254

M3 - Journal article

VL - 19

SP - 3430

EP - 3447

JO - Geochemistry, Geophysics, Geosystems

JF - Geochemistry, Geophysics, Geosystems

SN - 1525-2027

IS - 9

ER -