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Geosphere covers Mexico, the Colorado Plateau, Russia, and offshore New Jersey
Date:2/24/2014

oproterozoic, ultra-depleted in delta-18O waters outside of polar regions provide first independent evidence for a moderately glaciated, so-called "slushball," Earth climate between 2.45 and 2.23 billion years ago, in which low- or mid-latitude, midsize continents were covered with glaciers while the ocean remained at least partially unfrozen to allow for intracontinental isotopic distillation in a large temperature gradient. This paper provides detailed micro-analytical and geochronologic investigation in an attempt to constrain the timing and mechanism of isotopic depletion and tie them to Paleoproterozoic glaciations.


Tectonic evolution of the Tualatin basin, northwest Oregon, as revealed by inversion of gravity data
D.K. McPhee et al., U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA. Published online 21 Feb. 2014, http://dx.doi.org/10.1130/GES00929.1.

The Tualatin basin, west of Portland (Oregon, USA), is one of several basins within the Puget-Willamette lowland, a structural and topographic trough between the Coast Range and Cascade volcanic arc. The Puget-Willamette lowland is seismically active and home to most of the Oregon and Washington State populations and major cities. New gravity measurements show that the Tualatin basin is characterized by a gravity low, which reflects the large density contrast between basin fill and the surrounding basement rock, composed primarily of Siltetz terrane. Modeling of the gravity data shows that the Tualatin basin is about 6 km deep and contains several kilometers of sediment that pre-date the emplacement of Miocene Columbia River Basalt Group (CRBG) around 15 million years ago. In addition, the new three-dimensional geometry of the Tualatin basin presented here shows that the basin is bounded by linear faults along the southwest and northeast margins, suggesting a pull-apart orig
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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