Laser 40Ar/39Ar dating of single detrital muscovite grains from early foreland-basin sedimentary deposits in India: Implications for early Himalayan evolution

In India, the Dagshai and overlying Kasauli Formations represent the oldest exposed continental foredeep sediments eroded from the Himalayan orogen. 40Ar/39Ar dating of individual detrital white micas from these sedimentary units has provided maximum depositional ages of <28 Ma for the Dagshai Formation at one locality and <25 Ma at a second locality, whereas deposition of the Kasauli Formation occurred after 28 Ma at two localities and after 22 Ma at a third locality. This timing suggests that, in India, the start of substantial exhumation and erosion from the rising Himalayan orogen was delayed until 28 Ma.

[1]  S. Critelli,et al.  Paleogeographic and paleotectonic evolution of the Himalayan Range as reflected by detrital modes of Tertiary sandstones and modern sands (Indus transect, India and Pakistan) , 1996 .

[2]  T. Harrison,et al.  Detection of inherited monazite in the Manaslu leucogranite by 208Pb232Th ion microprobe dating: Crystallization age and tectonic implications , 1995 .

[3]  J. Wijbrans,et al.  Argon geochronology of small samples using the Vulkaan argon laserprobe , 1995 .

[4]  Y. Najman.  Evolution of the early Himalayan foreland basin in N.W. India and its relationship to Himalayan orogenesis , 1995 .

[5]  R. Enkin,et al.  Palaeomagnetic dating of the earliest continental Himalayan foredeep sediments: Implications for Himalayan evolution , 1994 .

[6]  P. England,et al.  CONVECTIVE REMOVAL OF LITHOSPHERE BENEATH MOUNTAIN BELTS - THERMAL AND MECHANICAL CONSEQUENCES , 1994 .

[7]  K. Hodges,et al.  Pressure‐temperature‐time paths from two‐dimensional thermal models: Prograde, retrograde, and inverted metamorphism , 1994 .

[8]  Michael R Johnson,et al.  Early stages of foreland basin evolution in the Lesser Himalaya, N India , 1993, Geological Society, London, Special Publications.

[9]  J. Dewey,et al.  Orogenic uplift and collapse, crustal thickness, fabrics and metamorphic phase changes: the role of eclogites , 1993, Geological Society, London, Special Publications.

[10]  N. Harris,et al.  Tectonothermal evolution of the High Himalayan Crystalline Sequence, Langtang Valley, northern Nepal , 1992 .

[11]  J. R. Cochran.  Himalayan Uplift, Sea Level, and the Record of Bengal Fan Sedimentation at the ODP Leg 116 Sites , 1990 .

[12]  P. Bossart,et al.  Rocks of the Murree formation in Northern Pakistan: indicators of a descending foreland basin of late Paleocene to middle Eocene age , 1989 .

[13]  T. Blenkinsop.  Definition of low-grade metamorphic zones using illite crystallinity , 1988 .

[14]  D. Cooper,et al.  Collision tectonics of the Ladakh-Zanskar Himalaya , 1988, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[15]  K. Hodges,et al.  Thermal evolution of the Greater Himalaya, Garhwal, India , 1988 .

[16]  P. Molnar,et al.  Gravity anomalies, flexure of the Indian Plate, and the structure, support and evolution of the Himalaya and Ganga Basin , 1985 .

[17]  J. Stix,et al.  Paleomagnetic Chronology, Fluvial Processes, and Tectonic Implications of the Siwalik Deposits near Chinji Village, Pakistan , 1985, The Journal of Geology.

[18]  C. Froidevaux,et al.  Tectonics and topography for a lithosphere containing density heterogeneities , 1982 .

[19]  M. R. Johnson.  The erosion factor in the emplacement of the Keystone thrust sheet (South East Nevada) across a land surface , 1981, Geological Magazine.

[20]  P. England,et al.  Metamorphic consequences of crustal eclogite production in overthrust orogenic zones , 1979 .

[21]  R. Kidd,et al.  Indian Ocean sediment distribution since the Late Jurassic , 1978 .