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Episodic zircon ages, Hf isotopic composition, and the preservation rate of continental crust

Kent C. Condie, Marion E. Bickford, Richard C. Aster, Elena A. Belousova and David W. Scholl
Episodic zircon ages, Hf isotopic composition, and the preservation rate of continental crust
Geological Society of America Bulletin (May 2011) 123 (5-6): 951-957

Abstract

U/Pb detrital zircon ages from global modern river sediments define eight peak clusters centered at 2700, 2500, 2010, 1840, 1600, 1150, 600, and 300 Ma. These clusters extend vertically into both positive and negative epsilon (sub Hf) (T) space and are similar to those in orogenic granitoids that correlate well with supercontinent formation. We suggest that the clusters are preservation peaks that reflect juvenile and reworked continental crust selectively preserved during continental collisions. The greatest contribution of juvenile continental crust is associated with the 1600 and 1150 Ma clusters and may reflect a change in the style of collisional orogens in the Paleoproterozoic involving thicker and stronger lithosphere. Age gaps at 2400-2200, 1400-1300, 900-650, and 185-120 Ma represent times when crustal production and recycling rates were about the same. Although some new continental growth may occur during continental collisions, supercontinent assembly does not require an increase in production rate of continental crust. Rather, we suggest that the preservation rate increases by an increased probability of capture of both new and reworked continental crust in collisional orogens.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 123
Serial Issue: 5-6
Title: Episodic zircon ages, Hf isotopic composition, and the preservation rate of continental crust
Affiliation: New Mexico Institute of Mining and Technology, Department of Earth and Environmental Science, Socorro, NM, United States
Pages: 951-957
Published: 201105
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 47
Accession Number: 2011-044429
Categories: Solid-earth geophysicsGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2011055
Illustration Description: illus.
Secondary Affiliation: Syracuse University, USA, United StatesMacquarie University, AUS, AustraliaUniversity of Alaska, Fairbanks, 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: 201125
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