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From 503-million-year-old fungi to recent earthquakes: New Geology posted ahead of print
Date:4/20/2012

mm-thick slip zone is a magnetic recorder. Generally, people emphasize the possible imprint of co-seismic current magnetic overprint. Here, Yu-Min Chou and colleagues show that the magnetic record is due to the dual action of temperature drop and chemical processes. This means that the magnetic record is robust at the scale of geological time. Their study further shows that (1) a rock magnetic investigation, fully automated, allows the identification of the mm-thick Chi-Chi slip zone (Mw 7.6, 1999, Taiwan); (2) the 16-cm-thick layer of intensively deformed rocks is remagnetized during earthquake due to the presence of fluids; and (3) they provide a fault gouge's magnetic record cycle in the event of a large earthquake. This study constitutes a new, fast, and non-destructive way to find the most recent principal slip zone of a fault.

Detrital zircon provenance from the Neuqun Basin (south-central Andes): Cretaceous geodynamic evolution and sedimentary response in a retroarc-foreland basin
A. Di Giulio et al., Dipartimento di Scienze della Terra, Universit di Pavia, Corso Strada Nuova 65, 27100 Pavia, Italy. Posted online 19 April; doi: 10.1130/G33052.1.

A. Di Giulio and colleagues reconstruct the surface response, in terms of drainage pattern changes, to the Cretaceous geodynamic reorganization of the Andean subduction zone between 36 degrees and 41 degrees south by studying the geochronology-based provenance of alluvial detrital zircons. The age spectra obtained by 500 spot uranium-lead (U-Pb) ages record an eastward provenance of detritus coming from the foreland during the Early Cretaceous backarc extensional stage, followed by westward-sourced clastics coming from the Cordillera during the Cenomanian. This drainage pattern reversal fits the regional unconformity in the sedimentary record that is linked to the geodynamic reorganization of the continental margin from an extensional to a compressional regime, forcing the Ne
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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