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The enigma of crustal zircons in upper-mantle rocks; clues from the Tumut Ophiolite, southeast Australia
Elena A. Belousova, Jose Maria Gonzalez Jimenez, Ian Graham, William L. Griffin, Suzanne Y. O'Reilly, Norman J. Pearson, Laure Martin, Stephen Craven and Cristina Talavera
The enigma of crustal zircons in upper-mantle rocks; clues from the Tumut Ophiolite, southeast Australia
Geology (Boulder) (February 2015) 43 (2): 119-122
The enigma of crustal zircons in upper-mantle rocks; clues from the Tumut Ophiolite, southeast Australia
Geology (Boulder) (February 2015) 43 (2): 119-122
Index Terms/Descriptors
- absolute age
- Australasia
- Australia
- chromitite
- crust
- dates
- geochemistry
- granites
- hafnium
- Hf-177/Hf-176
- igneous rocks
- isotope ratios
- isotopes
- Lachlan fold belt
- laurite
- magmatism
- mantle
- Mesoproterozoic
- metals
- nesosilicates
- New South Wales Australia
- O-18/O-16
- ophiolite
- orthosilicates
- Os-188/Os-187
- osmium
- oxygen
- platinum group
- plutonic rocks
- Precambrian
- Proterozoic
- radioactive isotopes
- Re-187/Os-188
- rhenium
- silicates
- stable isotopes
- sulfides
- trace elements
- U/Pb
- ultramafics
- upper mantle
- upper Precambrian
- zircon
- zircon group
- southeastern Australia
- Tumut Ophiolite
Latitude & Longitude
Abstract
We suggest a new explanation for the presence of crustally derived zircons in the upper-mantle rocks of ophiolitic complexes, as an alternative to subduction-related models. Integrated isotopic (U-Pb, Hf, and O isotopes) and trace-element data for zircons from the Tumut ophiolitic complex (southeast Australia) indicate that these grains are related to granitic magmatism and were introduced into the mantle rocks after their emplacement into the crust. These observations emphasize that a clear understanding of the origin of individual zircon populations and their relationship to the host rock is essential to interpretations of the tectonic history of upper-mantle rocks and the dynamics of crust-mantle interactions.
ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 43
Serial Issue: 2
Title: The enigma of crustal zircons in upper-mantle rocks; clues from the Tumut Ophiolite, southeast Australia
Author(s): Belousova, Elena A.Gonzalez Jimenez, Jose MariaGraham, IanGriffin, William L.O'Reilly, Suzanne Y.Pearson, Norman J.Martin, LaureCraven, StephenTalavera, Cristina
Affiliation: Macquarie University, ARC Centre of Excellence for Core to Crust Fluid Systems,
Sydney, N.S.W.,
Australia
Pages: 119-122
Published: 201502
Text Language: English
Publisher: Geological Society of America (GSA),
Boulder, CO,
United States
References: 23
DOI:
10.1130/G36231.1
Accession Number: 2015-016279
Categories: Isotope geochemistryIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2015049
Illustration Description: illus. incl. 1 table, geol. sketch map
S42°00'00" - S30°00'00", E143°00'00" - E150°15'00"
S37°30'00" - S28°15'00", E141°00'00" - E153°30'00"
Secondary Affiliation: University of New South Wales,
AUS,
AustraliaUniversity of Western Australia,
AUS,
AustraliaCurtin University,
AUS,
Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, 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: 201508
