T. E. Jeffries

Natural History Museum

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S. S. Russell

Natural History Museum

C. M. O'd. Alexander

Carnegie Institution for Science

Anders Meibom

University of Lausanne

Alexander N. Krot

University of Hawaiʻi at Mānoa

István Dunkl

University of Göttingen

RK Shail

University of Exeter

Javier Fernández‐Suárez

Universidad Complutense de Madrid

A. A. Ulyanov

Lomonosov Moscow State University

Klaus Keil

University of Hawaii System

CC Wilkinson

Natural History Museum

Cooperative Institutions

Goethe University Frankfurt

University of Hawaiʻi at Mānoa

University of Göttingen

Natural History Museum

Universitätsmedizin Göttingen

Gesellschaft für wissenschaftliche Datenverarbeitung mbH Göttingen

University of Hawaii System

Karlsruhe Institute of Technology

Universidad Complutense de Madrid

Universidad de Salamanca

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Double dating of detrital zircon from the Dinarides by fission-track and LA-ICPMS U/Pb analysis

EGU General Assembly Conference Abstracts (2009)

Tamás Mikes T. E. Jeffries István Dunkl Raimon Tolosana‐Delgado Hilmar von Eynatten

In sedimentary provenance analysis, a fundamental question is the age of a crystalline source rock and the timing of subsequent thermotectonic events that affected crystalline terrains prior to exhumation and erosion. Zircon is a useful detrital mineral which carries a wealth of information about the petrogenesis, geochronology, alteration, and cooling history of its source rocks, but only few attempts were made so far to combine such data from single grains. We present an approach combining fission track (FT) and in-situ LA–ICPMS U/Pb isotopic analyses from the same grain. Detrital zircons were dated by the FT method, and grain interiors were imaged by SEM-CL to avoid ablation of inherited or other unsuitable domains. Precise and accurate U/Pb isotopic compositions were determined by a simple setup consisting of a 213 nm Nd:YAG laser source, coupled to a quadrupole ICPMS instrument. Our results are significant for at least two reasons: (1) The U/Pb analytical protocols provide an excellent trade-off between analysis quality and a high, cost-effective sample throughput (70-100 zircon grains per day). CL-control and a good spatial resolution aid in reducing age bias, as judged from the notably high proportion (>90%) of concordant (±5%) grain ages. (2) The double dating approach yields valuable insights into the thermal history of source terrains of Dinaride synorogenic sediments. Several clusters of age-pairs can be isolated that identify Alpine tectonostratigraphic units. Given that basement geochronology is known in detail, several source terranes can be pinpointed with a high level of confidence that is normally not achieved by using the two dating techniques separately. A majority of the grains indicating Late Cretaceous overprint is derived from the Austroalpine and/or Tisza Units as this thermal event is not recorded in the Central and Northern Dinarides. Our results clearly demonstrate the mixing of sediments derived from exhumed source areas that previously underwent fundamentally different thermal histories. In the light of new biostratigraphic results indicating post-Eocene depositional age for the outer Dinaride foreland basin sediments and suggesting a complex sediment reworking pattern (Mikes et al. 2008), ambiguous heavy mineral data from these sediments can be re-interpreted in terms of a large-scale dispersal history involving the Pelagonides and the Austroalpine/Tisza Units as the major sedimentary source areas.

Fission track dating

Geochronology

Thermochronology

Basement

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Age and setting of the Upper Neoproterozoic Narcea Antiform volcanic rocks (NW Iberia)

Geogaceta (2003)

Gabriel Gutiérrez‐Alonso Javier Fernández‐Suárez T. E. Jeffries

U-Pb dating of zircons from ryolites intercalated within the Narcea Antiform Neoproterozoic rocks was performed by laser ablation ICP-MS). The age of the ryolite is 559±3 Ma which allows the separation of two different units within the previously established Tineo Series. It is suggested that a terrane-transfer related pull-apart environment could have been the ideal setting for the genesis of these rocks in accordance with previously proposed models for the Neoproterozoic evolution of this region.

Anticline

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Citations (21)

Rare Earth Element Systematics of Fine Grained Calcium-Aluminium-rich Inclusions and Amoeboid Olivine Aggregates from Efremovka (CV3)

LPI (2003)

S. S. Russell Alexander N. Krot T. E. Jeffries A. A. Ulyanov

Rare-earth element

Achondrite

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Citations (1)

Advances in in situ U–Pb dating of accessory minerals by LA-ICP-MS

Geochimica et Cosmochimica Acta (2006)

Craig Storey T. E. Jeffries Martin Smith

10.1016/j.gca.2006.06.1147

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Citations (3)

Metal contents of granite-derived fluids at the magmatic-hydrothermal transition; examples from the Tregonning Carn Brea Granites, Cornubian Orefield, SW England

Applied Earth Science Transactions of the Institutions of Mining and Metallurgy (2009)

CC Wilkinson Jamie J. Wilkinson RK Shail T. E. Jeffries

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Chondrules of the first generation? Trace-element geochemistry of silicates from bencubbin/CH-like meteorites.

Meteoritics and Planetary Science (2000)

A. N. Krot Anders Meibom C. M. O'd. Alexander T. E. Jeffries S. S. Russell

Keywords: Chondrite Reference EPFL-CONF-177131View record in Web of Science Record created on 2012-05-15, modified on 2016-08-09

Chondrule

Trace element

TRACE (psycholinguistics)

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A New Astrophysical Setting for Chondrule Formation

Science (2001)

Alexander N. Krot Anders Meibom S. S. Russell C. M. O'd. Alexander T. E. Jeffries

Chondrules in the metal-rich meteorites Hammadah al Hamra 237 and QUE 94411 have recorded highly energetic thermal events that resulted in complete vaporization of a dusty region of the solar nebula (dust/gas ratio of about 10 to 50 times solar). These chondrules formed under oxidizing conditions before condensation of iron-nickel metal, at temperatures greater than or equal to 1500 K, and were isolated from the cooling gas before condensation of moderately volatile elements such as manganese, sodium, potassium, and sulfur. This astrophysical environment is fundamentally different from conventional models for chondrule formation by localized, brief, repetitive heating events that resulted in incomplete melting of solid precursors initially residing at ambient temperatures below approximately 650 K.

Chondrule

Vaporization

Volatiles

Oxidizing agent

10.1126/science.291.5509.1776

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Citations (92)