Heavy-Mineral Mining in the Atlantic Coastal Plain and What Deposit Locations Tell Us about Ancient Shorelines

Pirkle, Fredric L.; Pirkle, William A.; Rich, F. J.

doi:10.2112/si_69_11

Cited by 5 publications

(7 citation statements)

References 27 publications

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“…Drapes over lidar elevation data (Fig. 3) show the eTh values are generally higher along the shoreface and lower along the backbarrier, similar to deposits mapped via sampling in Georgia, Florida, and eastern Australia (Roy, 1999;Pirkle et al, 2013). The highest eTh values occur mainly near the tips of the barrier islands at inlets where tidal activity is increased and near crosscutting features visible in lidar data that suggest multiple episodes of sand reworking (marked in Fig.…”

Section: Thoriumsupporting

confidence: 52%

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Mapping Critical Minerals from the Sky

Shah¹,

Morrow²,

Pace³

et al. 2021

GSAT

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Section: Thoriumsupporting

confidence: 52%

“…The anomalies are highest over 3-12-kmlong and 400-1200-m-wide portions of sand ridges (Fig. 2B), similar to some of the shoreline deposits located near the actively mined Trail Ridge/Folkston system in Georgia and Florida (Pirkle et al, 2013). These anomalies contrast broader, rounded, and lower anomalies over clay/mud estuarine areas (Fig.…”

Section: Thoriummentioning

confidence: 52%

Mapping Critical Minerals from the Sky

Shah¹,

Morrow²,

Pace³

et al. 2021

GSAT

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“…Although the Coastal Plain is a depositional landscape and previous work either assumes (Bernal et al, ) or finds evidence (Pirkle et al, ) that regional C‐rich subsoils result from burial, we find multiple lines of evidence indicating that DPC stabilization is unrelated to burial. First, not a single original horizon designation across our database identifies depositional discontinuities or burial in soils with DPC as professional soil scientists found no field or analytical evidence of burial (Table S3; Soil Science Division Staff, ).…”

Section: Resultsmentioning

confidence: 99%

A Billion Tons of Unaccounted for Carbon in the Southeastern United States

Gonzalez

Bacon

Harris

2018

Geophysical Research Letters

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Because Earth's soil contains more carbon than the atmosphere and all terrestrial vegetation combined, forecasting and managing the global carbon cycle in the face of natural and anthropogenic change requires accurate representations of this carbon. Here from regional geomorphic and soil databases, we characterize the mass, distribution, and cycling of previously unaccounted for soil carbon across the southeastern U.S. Coastal Plain, referred to as “deep‐podzolized carbon.” We show that geomorphologic‐hydrologic interactions stabilize approximately 1.1 × 10−9 t of deep‐podzolized carbon (equivalent to roughly 18% of the soil organic carbon stored across the entire region from 0–30 cm), and that this potentially ancient carbon is predictably distributed coincident with Pleistocene marine transgressions. We not only redefine soil carbon storage in the region but we also introduce the Earth Sciences to a massive organic carbon pool that interacts with landscape evolution and hydrology, has essentially never been studied, and is ripe for interdisciplinary research.

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“…In analyses of late Pleistocene Taxodium-bearing strata from bluffs on the Florida bank of the St. Marys River (southeast GeorgiaÀnortheast Florida), Pirkle et al (2013) note that Tsuga pollen was found in seven of the 11 samples collected and analyzed from the Reids-Roses-Bells Bluffs complex in the late 1980s. The points of accumulation included a ghost shrimp burrow (form genus Ophiomorpha) associated with a stratum including shells of the marine mollusk Anadara.…”

Section: Interpretationsmentioning

confidence: 99%

The palynology of Upper Pleistocene and Holocene sediments from the eastern shoreline and Central Depression of St. Catherines Island, Georgia, USA

2014

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Sediment samples from the Hoke's Landing area of St. Catherines Island, Georgia, were analyzed for their pollen and spore contents, and were further analyzed for their clay mineralogy and time of deposition. Samples were retrieved from a core collected in July, 2013, and were recovered from a site lying near an early-twentieth-century oyster boiler on the eastern side of the island, the Hoke's Landing oyster boiler. The continuous core was more than 4.5 m long, representing one of the longest continuous cores collected on the island. Palynological and radiocarbon analyses provide significant information concerning the Late Pleistocene and Holocene evolution of the island; one of the most ancient finite radiocarbon ages (31,990 § 230 years BP) came from the Hoke's Landing site. Clay analyses indicate the presence of montmorillonite, kaolinite and illite, indicating sediment contributions from marine and terrestrial environments. Palynological data show that the freshwater fern Woodwardia grew in abundance at the site nearly 32,000 years ago. Investigation of other strata from the island, and comparison with data derived from other locations on the Georgia coastal plain, were undertaken. Emphasis was placed on the timing and topographic extent of the Pleistocene sea level lowstand along the eastern seaboard of North America. The effects of the eastward migration of the Georgia coastal zone during the lowstand are preserved in sediments at Hoke's Landing, and provide a convincing new source of information concerning the nature of Pleistocene lowstand terrestrial communities in that region.

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Heavy-Mineral Mining in the Atlantic Coastal Plain and What Deposit Locations Tell Us about Ancient Shorelines

Cited by 5 publications

References 27 publications

Mapping Critical Minerals from the Sky

Mapping Critical Minerals from the Sky

A Billion Tons of Unaccounted for Carbon in the Southeastern United States

The palynology of Upper Pleistocene and Holocene sediments from the eastern shoreline and Central Depression of St. Catherines Island, Georgia, USA

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