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Geosphere covers Grand Canyon, deep drill coring, Death Valley, and more
Date:12/28/2012

ory. An extensive downhole logging programme was successfully carried out. The aim of these analyses was to use detailed interpretation of the downhole logs to obtain a description of the lithologies and their specific physical properties that is independent of the core descriptions. Sabine Hunze and colleagues use statistical analyses to establish an independent lithological column and to identify boundaries of change in sediment composition, provenance, and/or environmental conditions, and the uranium content in the downhole logs to determine hiatuses. The main purpose of this paper is to provide important new constraints on lithostratigraphy (Plio-Pleistocene sediment composition and paleoenvironment) that have general bearing for understanding the climatic evolution of the Victoria Land Basin within the West Antarctic Rift. Some remarkable results could be achieved from the downhole logging data of AND-2A borehole although the boundary conditions for interpretation were far from ideal: (1) there is no great variability in the lithology of the AND-2A core, (2) the cementation occur over various lithology and changes the physical parameters of each lithology significantly. All results presented in this paper show the benefit of downhole logging for the overall understanding of the ANDRILL geological setting.


Continental arc-island arc fluctuations, growth of crustal carbonates, and long-term climate change
Cin-Ty A. Lee et al., Dept. of Earth Science, MS-126, Rice University, 6100 Main Street, Houston, Texas 77005, USA. Posted online 13 Dec. 2012; http://dx.doi.org/10.1130/GES00822.1.

The Cretaceous to early Paleogene (50 to 140 million years ago) was characterized by a greenhouse baseline climate, driven by elevated concentrations of atmospheric CO2. Hypotheses for the elevated CO2 concentrations invoke an increase in volcanic CO2 production due to higher oceanic
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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