Nd and Pb isotope variability in the Indus River system: Implications for sediment provenance and crustal heterogeneity in the Western Himalaya

Peter Dominic Clift, J. I. Lee, P. Hildebrand, N. Shimizu, G. D. Layne, J. Blusztajn, J. D. Blum, E. Garzanti, A. A. Khan

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

The Indus River system is the only major drainage system in the western Himalaya, and erodes not only the High Himalaya, but also topographically high regions within and north of the Indus Suture Zone, most notably the Karakoram. Ion microprobe analysis of Pb isotopes in detrital K-feldspar grains taken from the tributaries of the Indus, together with bulk Nd isotope analysis of those same sediments, is here used to identify distinct sediment source regions. These span the very radiogenic Nanga Parbat and associated Lesser Himalaya, the relatively radio genic-intermediate High Himalaya, the unradiogenic Ladakh and Kohistan Batholiths and intermediate values in the Hindu Kush, Karakoram and Lhasa Block. The range of compositions reflects differing degrees of recycling of older continental crust during petrogenesis. K-feldspars from the Ladakh and Kohistan Batholiths are less radiogenic than the laterally equivalent Gangdese granite of Tibet, interpreted to reflect the preferential recycling of accreted oceanic arc units within the western Transhimalaya prior to India-Asia collision. Similarly the Zanskar High Himalaya are less radiogenic than their equivalents in Nepal. Isotope values from Pleistocene Indus Fan sediment are compatible with a dominant source in the Karakoram, with additional important contributions from the arc batholiths and High Himalaya, reflecting both the area and modern rates of tectonic uplift within the drainage basin. In contrast, radiogenic grains are common in the lower reaches of the modern Indus River, possibly as a result of the damming of the main river channel where it reaches the foreland. (C) 2002 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)91-106
Number of pages15
JournalEarth and Planetary Science Letters
Volume200
Issue number1-2
DOIs
Publication statusPublished - Jun 2002

Keywords

  • Himalayas
  • provenance
  • ion probe
  • isotope ratios
  • NORTHERN PAKISTAN
  • NANGA-PARBAT
  • KARAKORAM BATHOLITH
  • RAPID DENUDATION
  • COOLING HISTORY
  • NW HIMALAYA
  • K2 GNEISS
  • CONSTRAINTS
  • EVOLUTION
  • ARC

Cite this

Nd and Pb isotope variability in the Indus River system: Implications for sediment provenance and crustal heterogeneity in the Western Himalaya. / Clift, Peter Dominic; Lee, J. I.; Hildebrand, P.; Shimizu, N.; Layne, G. D.; Blusztajn, J.; Blum, J. D.; Garzanti, E.; Khan, A. A.

In: Earth and Planetary Science Letters, Vol. 200, No. 1-2, 06.2002, p. 91-106.

Research output: Contribution to journalArticle

Clift, Peter Dominic ; Lee, J. I. ; Hildebrand, P. ; Shimizu, N. ; Layne, G. D. ; Blusztajn, J. ; Blum, J. D. ; Garzanti, E. ; Khan, A. A. / Nd and Pb isotope variability in the Indus River system: Implications for sediment provenance and crustal heterogeneity in the Western Himalaya. In: Earth and Planetary Science Letters. 2002 ; Vol. 200, No. 1-2. pp. 91-106.
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abstract = "The Indus River system is the only major drainage system in the western Himalaya, and erodes not only the High Himalaya, but also topographically high regions within and north of the Indus Suture Zone, most notably the Karakoram. Ion microprobe analysis of Pb isotopes in detrital K-feldspar grains taken from the tributaries of the Indus, together with bulk Nd isotope analysis of those same sediments, is here used to identify distinct sediment source regions. These span the very radiogenic Nanga Parbat and associated Lesser Himalaya, the relatively radio genic-intermediate High Himalaya, the unradiogenic Ladakh and Kohistan Batholiths and intermediate values in the Hindu Kush, Karakoram and Lhasa Block. The range of compositions reflects differing degrees of recycling of older continental crust during petrogenesis. K-feldspars from the Ladakh and Kohistan Batholiths are less radiogenic than the laterally equivalent Gangdese granite of Tibet, interpreted to reflect the preferential recycling of accreted oceanic arc units within the western Transhimalaya prior to India-Asia collision. Similarly the Zanskar High Himalaya are less radiogenic than their equivalents in Nepal. Isotope values from Pleistocene Indus Fan sediment are compatible with a dominant source in the Karakoram, with additional important contributions from the arc batholiths and High Himalaya, reflecting both the area and modern rates of tectonic uplift within the drainage basin. In contrast, radiogenic grains are common in the lower reaches of the modern Indus River, possibly as a result of the damming of the main river channel where it reaches the foreland. (C) 2002 Elsevier Science B.V. All rights reserved.",
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T1 - Nd and Pb isotope variability in the Indus River system: Implications for sediment provenance and crustal heterogeneity in the Western Himalaya

AU - Clift, Peter Dominic

AU - Lee, J. I.

AU - Hildebrand, P.

AU - Shimizu, N.

AU - Layne, G. D.

AU - Blusztajn, J.

AU - Blum, J. D.

AU - Garzanti, E.

AU - Khan, A. A.

PY - 2002/6

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N2 - The Indus River system is the only major drainage system in the western Himalaya, and erodes not only the High Himalaya, but also topographically high regions within and north of the Indus Suture Zone, most notably the Karakoram. Ion microprobe analysis of Pb isotopes in detrital K-feldspar grains taken from the tributaries of the Indus, together with bulk Nd isotope analysis of those same sediments, is here used to identify distinct sediment source regions. These span the very radiogenic Nanga Parbat and associated Lesser Himalaya, the relatively radio genic-intermediate High Himalaya, the unradiogenic Ladakh and Kohistan Batholiths and intermediate values in the Hindu Kush, Karakoram and Lhasa Block. The range of compositions reflects differing degrees of recycling of older continental crust during petrogenesis. K-feldspars from the Ladakh and Kohistan Batholiths are less radiogenic than the laterally equivalent Gangdese granite of Tibet, interpreted to reflect the preferential recycling of accreted oceanic arc units within the western Transhimalaya prior to India-Asia collision. Similarly the Zanskar High Himalaya are less radiogenic than their equivalents in Nepal. Isotope values from Pleistocene Indus Fan sediment are compatible with a dominant source in the Karakoram, with additional important contributions from the arc batholiths and High Himalaya, reflecting both the area and modern rates of tectonic uplift within the drainage basin. In contrast, radiogenic grains are common in the lower reaches of the modern Indus River, possibly as a result of the damming of the main river channel where it reaches the foreland. (C) 2002 Elsevier Science B.V. All rights reserved.

AB - The Indus River system is the only major drainage system in the western Himalaya, and erodes not only the High Himalaya, but also topographically high regions within and north of the Indus Suture Zone, most notably the Karakoram. Ion microprobe analysis of Pb isotopes in detrital K-feldspar grains taken from the tributaries of the Indus, together with bulk Nd isotope analysis of those same sediments, is here used to identify distinct sediment source regions. These span the very radiogenic Nanga Parbat and associated Lesser Himalaya, the relatively radio genic-intermediate High Himalaya, the unradiogenic Ladakh and Kohistan Batholiths and intermediate values in the Hindu Kush, Karakoram and Lhasa Block. The range of compositions reflects differing degrees of recycling of older continental crust during petrogenesis. K-feldspars from the Ladakh and Kohistan Batholiths are less radiogenic than the laterally equivalent Gangdese granite of Tibet, interpreted to reflect the preferential recycling of accreted oceanic arc units within the western Transhimalaya prior to India-Asia collision. Similarly the Zanskar High Himalaya are less radiogenic than their equivalents in Nepal. Isotope values from Pleistocene Indus Fan sediment are compatible with a dominant source in the Karakoram, with additional important contributions from the arc batholiths and High Himalaya, reflecting both the area and modern rates of tectonic uplift within the drainage basin. In contrast, radiogenic grains are common in the lower reaches of the modern Indus River, possibly as a result of the damming of the main river channel where it reaches the foreland. (C) 2002 Elsevier Science B.V. All rights reserved.

KW - Himalayas

KW - provenance

KW - ion probe

KW - isotope ratios

KW - NORTHERN PAKISTAN

KW - NANGA-PARBAT

KW - KARAKORAM BATHOLITH

KW - RAPID DENUDATION

KW - COOLING HISTORY

KW - NW HIMALAYA

KW - K2 GNEISS

KW - CONSTRAINTS

KW - EVOLUTION

KW - ARC

U2 - 10.1016/S0012-821X(02)00620-9

DO - 10.1016/S0012-821X(02)00620-9

M3 - Article

VL - 200

SP - 91

EP - 106

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

IS - 1-2

ER -