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Petrofacies and Detrital Geochronology of the Lower Pennsylvanian Pottsville Formation from the Northern Appalachian Basin, Pennsylvania
(2019-07-30)
The Appalachian foreland basin preserves a late Paleozoic synorogenic clastic wedge formed during the Alleghenian orogeny in response to the collision between Laurentian and Gondwanan continents. The Lower Pennsylvanian ...
Surficial Investigations of Hargraves Crater and Siloe Patera, Mars
(2019-07-15)
This study investigates Hargraves crater and Siloe Patera of Mars. Individual barchan and barchanoids dunes in Hargraves were almost accurately identified using a semi-automated object-based image analysis technique. The ...
Provenance of a boulder-bearing impact breccia from surface outcrops and a drill-core from the Wetumpka Impact Structure, Elmore County, Alabama
(2019-07-15)
The Wetumpka crater is a shallow marine impact structure located in the Elmore County, Alabama. The impact event occurred at approximately 85 Ma, during Late Cretaceous. The target was a shallow marine environment with a ...
Development of Global Social Vulnerability Model for Earthquakes
(2019-07-23)
Although earthquakes are one of the most devastating natural hazards that affect humanity, very few attempts have been made to consider the human elements that put populations at risk. Most researchers focus on the assessment ...
Linking Observed Seismicity to Crustal Structure in the New Madrid Seismic Zone Using Gravity and Magnetic Modeling
(2019-07-23)
The New Madrid Seismic Zone in the Central United States is a highly active seismic zone. Research has focused on the subsurface structure and history of development in order to gain better insight into the cause of these ...
Stratigraphy, Ore Mineralogy, Geochemistry, and Genesis of Gold-Bearing Quartz Veins at the Hog Mountain Tonalite, Southwestern Appalachians, USA
(2019-04-24)
Hog Mountain of the southern Appalachians is a gold deposit in the eastern Blue Ridge of Alabama. The mineralized quartz veins found there have an average Au grade of 0.14 oz/t (maximum: 2.4 oz/t Au) and occur within a ...
Geology of the Alexander City 7.5’ Quadrangle, Alabama and U-Pb Zircon Dating of the Elkahatchee Quartz Diorite, southernmost Appalachian orogen
(2019-04-26)
Geological mapping of the Alexander City Quadrangle in the eastern Blue Ridge of the Southern Appalachian orogen in Alabama reveals newly recognized units and supports multi-phase magmatism within the 880 km2 Elkahatchee ...
A continuous 100 thousand-year stalagmite δ18O record from the Yucatan Peninsula: implications for Caribbean hydroclimate on orbital and millennial timescales
(2019-04-29)
I present a new stalagmite δ18O record, named Katún, collected from Río Secreto Natural Reserve in the Yucatan Peninsula (YP) that spans the interval between 198 kyr to 320 kyr before present (BP), thus offering the oldest ...
Geochemistry of Groundwater and Naturally Occurring Pyrite in the Holocene Fluvial Aquifers in Uphapee Watershed, Macon County, Alabama
(2019-08-09)
Naturally occurring biogenic pyrite has been found in Holocene fluvial aquifers in Uphapee watershed, Macon County, Alabama. The electron microprobe (EMP) analysis showed that the pyrite grains contain 0.20-0.92 weight% ...
Analysis of Subsurface Geology, including the Parautochthonous Breccias, Flynn Creek Impact Structure, Tennessee
(2019-12-02)
The present study concerns the Flynn Creek impact structure, Tennessee, which is estimated to have formed approximately 382 million years ago in a shallow marine environment. The present crater is about 3.8 km in diameter ...