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Extraordinary transport and mixing of sediment across Himalayan central Gondwana during the Cambrian-Ordovician

Paul M. Myrow, Nigel C. Hughes, John W. Goodge, C. Mark Fanning, Ian S. Williams, Peng Shanchi, Om N. Bhargava, Suraj K. Parcha and Kevin R. Pogue
Extraordinary transport and mixing of sediment across Himalayan central Gondwana during the Cambrian-Ordovician
Geological Society of America Bulletin (September 2010) 122 (9-10): 1660-1670

Abstract

Detrital zircon samples from Cambrian and Lower to Middle Ordovician strata were taken across and along the strike of the Himalaya from Pakistan to Bhutan ( approximately 2000 km). By sampling rocks from one time interval for nearly the entire length of an orogen, and by covering a range of lithotectonic units, we minimize time as a significant source of variance in detrital age spectra, and thus obtain direct assessment of the spatial variability in sediment provenance. This approach was applied to the Tethyan margin of the Himalaya, which during the Cambrian occupied a central depositional position between two major mountain belts that formed during the amalgamation of Gondwana, the internal East African orogen and the external Ross-Delamerian orogen of East Gondwana. Detrital age spectra from our Lesser and Tethyan Himalayan samples show that well-mixed sediment was dispersed across at least 2000 km of the northern Indian margin. The detrital zircon age spectra for our samples are consistent with sources for most grains from areas outside the Indian craton that record Pan-African events, such as the Ross-Delamerian orogen; East African orogen, including the juvenile Arabian-Nubian Shield; and Kuunga-Pinjarra orogen. The great distances of sediment transport and high degree of mixing of detrital zircon ages are extraordinary, and they may be attributed to a combination of widespread orogenesis associated with the assembly of Gondwana, the equatorial position of continents, potent chemical weathering, and sediment dispersal across a nonvegetated landscape.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 122
Serial Issue: 9-10
Title: Extraordinary transport and mixing of sediment across Himalayan central Gondwana during the Cambrian-Ordovician
Affiliation: Colorado College, Department of Geology, Colorado Springs, CO, United States
Pages: 1660-1670
Published: 201009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 118
Accession Number: 2010-068248
Categories: StratigraphyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010099
Illustration Description: illus. incl. sects., 2 tables, geol. sketch map
N27°00'00" - N37°00'00", E72°00'00" - E97°00'00"
Secondary Affiliation: University of California, Riverside, USA, United StatesUniversity of Minnesota-Duluth, USA, United StatesAustralian National University, AUS, AustraliaNanjing Institute of Geology and Paleontology, CHN, ChinaWadia Institute of Himalayan Geology, IND, IndiaWhitman College, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201037
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