Tracing patterns of unroofing in the Early Himalaya through microprobe Pb isotope analysis of detrital K-feldspars in the Indus Molasse, India

Peter Dominic Clift, N. Shimizu, N. Shimizu, G. D. Layne, G. D. Layne, J. Blusztajn, J. Blusztajn

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

The Indus Molasse is a pre- and syn-tectonic sedimentary sequence situated in the Indus Suture Zone of the western Himalaya. Spanning in time the collision of India and Asia, this deposit is well placed to record the evolving uplift and erosion history of the early Himalayan orogen. Nd isotope analyses from day extracted from shales interbedded within the dominantly alluvial sequence indicate a low negative E-Nid (-1.64 to 0.72). in the basal Paleocene Chogdo Formation, slightly more negative than measured values from the Transhimalaya and Kohistan/Dras Are. Up-section E-Nd becomes more negative, as low as -10.05. indicating influence of a different, more enriched source. Ion microprobe Pb isotopic analyses of single K-feldspars help constrain this sourer as being either the Lhasa or Karakoram Blocks, with westward paleo-current flow favoring the former. Pb-207/(204)b ratios are too low to be consistent with known Indian plate sources. a conclusion supported by the lack of muscovite or garnet that would be indicative of a High Himalayan contribution. Given the known age of rapid cooling of the High Himalaya at similar to 20 Ma, and the lack of exposure of suitable lithologies prior to that time, an age of sedimentation prior to similar to 20 Ma is inferred. The post-collisional change in paleo-flow and provenance is suggested to reflect the initiation of the Indus River during the Early Eocene. This study demonstrates the power of combined bulk sediment and single grain analyses in resolving provenance in tectonically complex settings. (C) 2001 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)475-491
Number of pages16
JournalEarth and Planetary Science Letters
Volume188
DOIs
Publication statusPublished - 2001

Keywords

  • India
  • Asia
  • Himalayas
  • provenance
  • ion probe data
  • isotopes
  • LADAKH HIMALAYA
  • NW INDIA
  • GENERAL-CIRCULATION
  • PAKISTAN HIMALAYA
  • AGE CONSTRAINTS
  • SOUTH TIBET
  • BENGAL FAN
  • SM-ND
  • EVOLUTION
  • COLLISION

Cite this

Tracing patterns of unroofing in the Early Himalaya through microprobe Pb isotope analysis of detrital K-feldspars in the Indus Molasse, India. / Clift, Peter Dominic; Shimizu, N.; Shimizu, N.; Layne, G. D.; Layne, G. D.; Blusztajn, J.; Blusztajn, J.

In: Earth and Planetary Science Letters, Vol. 188, 2001, p. 475-491.

Research output: Contribution to journalArticle

Clift, Peter Dominic ; Shimizu, N. ; Shimizu, N. ; Layne, G. D. ; Layne, G. D. ; Blusztajn, J. ; Blusztajn, J. / Tracing patterns of unroofing in the Early Himalaya through microprobe Pb isotope analysis of detrital K-feldspars in the Indus Molasse, India. In: Earth and Planetary Science Letters. 2001 ; Vol. 188. pp. 475-491.
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abstract = "The Indus Molasse is a pre- and syn-tectonic sedimentary sequence situated in the Indus Suture Zone of the western Himalaya. Spanning in time the collision of India and Asia, this deposit is well placed to record the evolving uplift and erosion history of the early Himalayan orogen. Nd isotope analyses from day extracted from shales interbedded within the dominantly alluvial sequence indicate a low negative E-Nid (-1.64 to 0.72). in the basal Paleocene Chogdo Formation, slightly more negative than measured values from the Transhimalaya and Kohistan/Dras Are. Up-section E-Nd becomes more negative, as low as -10.05. indicating influence of a different, more enriched source. Ion microprobe Pb isotopic analyses of single K-feldspars help constrain this sourer as being either the Lhasa or Karakoram Blocks, with westward paleo-current flow favoring the former. Pb-207/(204)b ratios are too low to be consistent with known Indian plate sources. a conclusion supported by the lack of muscovite or garnet that would be indicative of a High Himalayan contribution. Given the known age of rapid cooling of the High Himalaya at similar to 20 Ma, and the lack of exposure of suitable lithologies prior to that time, an age of sedimentation prior to similar to 20 Ma is inferred. The post-collisional change in paleo-flow and provenance is suggested to reflect the initiation of the Indus River during the Early Eocene. This study demonstrates the power of combined bulk sediment and single grain analyses in resolving provenance in tectonically complex settings. (C) 2001 Elsevier Science B.V. All rights reserved.",
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T1 - Tracing patterns of unroofing in the Early Himalaya through microprobe Pb isotope analysis of detrital K-feldspars in the Indus Molasse, India

AU - Clift, Peter Dominic

AU - Shimizu, N.

AU - Shimizu, N.

AU - Layne, G. D.

AU - Layne, G. D.

AU - Blusztajn, J.

AU - Blusztajn, J.

PY - 2001

Y1 - 2001

N2 - The Indus Molasse is a pre- and syn-tectonic sedimentary sequence situated in the Indus Suture Zone of the western Himalaya. Spanning in time the collision of India and Asia, this deposit is well placed to record the evolving uplift and erosion history of the early Himalayan orogen. Nd isotope analyses from day extracted from shales interbedded within the dominantly alluvial sequence indicate a low negative E-Nid (-1.64 to 0.72). in the basal Paleocene Chogdo Formation, slightly more negative than measured values from the Transhimalaya and Kohistan/Dras Are. Up-section E-Nd becomes more negative, as low as -10.05. indicating influence of a different, more enriched source. Ion microprobe Pb isotopic analyses of single K-feldspars help constrain this sourer as being either the Lhasa or Karakoram Blocks, with westward paleo-current flow favoring the former. Pb-207/(204)b ratios are too low to be consistent with known Indian plate sources. a conclusion supported by the lack of muscovite or garnet that would be indicative of a High Himalayan contribution. Given the known age of rapid cooling of the High Himalaya at similar to 20 Ma, and the lack of exposure of suitable lithologies prior to that time, an age of sedimentation prior to similar to 20 Ma is inferred. The post-collisional change in paleo-flow and provenance is suggested to reflect the initiation of the Indus River during the Early Eocene. This study demonstrates the power of combined bulk sediment and single grain analyses in resolving provenance in tectonically complex settings. (C) 2001 Elsevier Science B.V. All rights reserved.

AB - The Indus Molasse is a pre- and syn-tectonic sedimentary sequence situated in the Indus Suture Zone of the western Himalaya. Spanning in time the collision of India and Asia, this deposit is well placed to record the evolving uplift and erosion history of the early Himalayan orogen. Nd isotope analyses from day extracted from shales interbedded within the dominantly alluvial sequence indicate a low negative E-Nid (-1.64 to 0.72). in the basal Paleocene Chogdo Formation, slightly more negative than measured values from the Transhimalaya and Kohistan/Dras Are. Up-section E-Nd becomes more negative, as low as -10.05. indicating influence of a different, more enriched source. Ion microprobe Pb isotopic analyses of single K-feldspars help constrain this sourer as being either the Lhasa or Karakoram Blocks, with westward paleo-current flow favoring the former. Pb-207/(204)b ratios are too low to be consistent with known Indian plate sources. a conclusion supported by the lack of muscovite or garnet that would be indicative of a High Himalayan contribution. Given the known age of rapid cooling of the High Himalaya at similar to 20 Ma, and the lack of exposure of suitable lithologies prior to that time, an age of sedimentation prior to similar to 20 Ma is inferred. The post-collisional change in paleo-flow and provenance is suggested to reflect the initiation of the Indus River during the Early Eocene. This study demonstrates the power of combined bulk sediment and single grain analyses in resolving provenance in tectonically complex settings. (C) 2001 Elsevier Science B.V. All rights reserved.

KW - India

KW - Asia

KW - Himalayas

KW - provenance

KW - ion probe data

KW - isotopes

KW - LADAKH HIMALAYA

KW - NW INDIA

KW - GENERAL-CIRCULATION

KW - PAKISTAN HIMALAYA

KW - AGE CONSTRAINTS

KW - SOUTH TIBET

KW - BENGAL FAN

KW - SM-ND

KW - EVOLUTION

KW - COLLISION

U2 - 10.1016/S0012-821X(01)00346-6

DO - 10.1016/S0012-821X(01)00346-6

M3 - Article

VL - 188

SP - 475

EP - 491

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

SN - 0012-821X

ER -