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Catastrophic debris avalanches -- a second volcanic hazard
Date:7/18/2014

vician 87Sr/86Sr curve to biostratigraphy and geochronology: Implications for stratigraphic resolution
M.R. Saltzman et al., School of Earth Sciences, Ohio State University, Columbus, Ohio 43210, USA. Published online 30 June 2014; http://dx.doi.org/10.1130/B31038.1.

The strontium isotopic composition of the world's oceans changes through time in response to weathering of rocks on the continents. One of the most prominent changes occurred in the Ordovician period between about 465 and 455 million years ago. This drop in Sr isotopes in the Ordovician can also be used to tell time because the element Sr is globally well mixed in the world's oceans.


Xigaze Forearc Basin revisited (South Tibet): provenance changes and origin of the Xigaze Ophiolite
W. An et al., State Key Laboratory of Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210029, China. Published online 30 June 2014; http://dx.doi.org/10.1130/B31020.1.

Studies on forearc-basin (a forearc is the region between an oceanic trench and the associated volcanic arc at Pacific-type convergent margins) are greatly helpful for understanding and reconstructing the evolution of the entire subduction system. This study investigated the Xigaze forearc basin, forming in the late Early Cretaceous (110 to 75 Ma [million years ago]) during the subduction of Neo-Tethyn Ocean in south Tibet. The geochemical and stratigraphic signatures indicate that the Xigaze Ophiolite formed by forearc spreading and represents the basement of the forearc sedimentary sequence. Volcaniclastic sedimentation began with thick turbiditic sandstones and interbedded shales followed by shelfal, deltaic, and fluvial strata. Studies of U-Pb-Hf isotopes of detrital zircons revealed that three petrofacies with distinct provena
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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