Zhixiong Shen

Zhixiong Shen
Coastal Carolina University | CCU · Department of Marine Science

PhD

About

66
Publications
14,917
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858
Citations
Additional affiliations
September 2012 - July 2014
Tulane University
Position
  • Research Assistant Professor

Publications

Publications (66)
Article
The mid-Holocene sea-level highstand is a well-known phenomenon in sea-level science, yet the knowledge on the highstand’s spatial and temporal distribution remains incomplete. Here we study the southwest coast of the Arabian-Persian Gulf where a mid-Holocene sea-level highstand and subsequent sea-level fall may have occurred due to the Earth crust...
Article
The mid-Holocene sea-level highstand is a well-known phenomenon in sea-level science, yet the knowledge on the highstand’s spatial and temporal distribution remains incomplete. Here we study the southwest coast of the Arabian-Persian Gulf where a mid-Holocene sea-level highstand and subsequent sea-level fall may have occurred due to the Earth crust...
Article
Full-text available
The ability of deltas to persist by building new land is critical to maintaining these vital ecologic environments that are often home to major economic and population centers. However, the deposition of land-building sediment triggers load-induced shallow subsidence which may undermine the effectiveness of natural and engineered emergent landforms...
Article
Full-text available
Laser-diffraction analysis has been established as one of the standard methods for particle-size distribution (PSD) measurement. However, the uncertainty when analyzing naturally heterogeneous sediment is poorly constrained for the lack of control on one of its largest error sources simply originating from subsampling. Here, we introduce a novel su...
Article
Alluvial sedimentary records attract great attention for quantitative paleoflood studies because they may preserve continuous high-resolution archives in lowland floodplains that are most vulnerable to inland flooding. The coarse-grained flood deposit in oxbow lakes emerges as a promising paleoflood proxy due to its sensitivity to flood magnitude a...
Article
Full-text available
Approximately 13 km south of Gulf Shores, Alabama (United States), divers found in situ baldcypress (Taxodium distichum) stumps 18 m below the ocean surface. These trees could have only lived when sea level fell during the Pleistocene subaerially exposing the tectonically stable continental shelf. Here we investigate the geophysical properties alon...
Article
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Floodplains of large alluvial rivers modulate the composition of riverine organic carbon (OC) and control OC oxidative loss, constituting a critical component in the global river-atmosphere-ocean carbon cycle. Therefore, anthropogenic management disconnecting rivers from their floodplains is expected to reduce the oxidative loss and to change the q...
Article
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Dryland alluvial successions across interior South Africa are a focus of pedosedimentary research because they provide insights into past hydrogeomorphic changes and improve our understanding of allogenic and autogenic controls on fluvial systems. This paper focuses on an alluvial succession preserved within the Wilgerbosch River, on the Great Esca...
Article
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Alluvial and colluvial “cut and fill” deposits preserved in valleys of the Karoo, South Africa, reflect basin-scale adjustments in fluvial process-regime. Such deposits in the Wilgerbosch catchment have previously proven difficult to date using radiocarbon (¹⁴C) and optically stimulated luminescence (OSL) methods. In this paper, we test the suitabi...
Article
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Conversion of native grasslands to agricultural sites has resulted in remarkable changes in soil carbon at depth, but its impact on soil diagnostic horizons is unknown. This study was conducted to radiocarbon date the soil organic carbon (SOC) and quantify pedogenic carbonates in the Russian Chernozem at depth at three sites: a native grassland fie...
Article
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A rare fossiliferous site in Willacy County, Texas, contains a mass concentration of fossil Giant Gopher Tortoises (Gopherus hexagonatus). The site southeast of Raymondville was exposed in the late 1980s during archaeological surveys for drainage canal improvements. Numerous large adults with complete shells were recovered along with partial limb,...
Article
Optically stimulated luminescence (OSL) dating of heterogeneously-bleached sediment by means of a minimum age model requires the input of a ‘sigma_b’ (σb) value describing the overdispersion of the single-aliquot De distribution expected for a well-bleached sample. We propose that σb and associated uncertainty can be accurately determined if a larg...
Article
Full-text available
The decline of several of the world's largest deltas has spurred interest in expensive coastal restoration projects to make these economically and ecologically vital regions more sustainable. The success of these projects depends, in part, on our understanding of how delta plains evolve over time scales longer than the instrumental record. Building...
Article
Full-text available
Over the past century, many of the world's major rivers have been modified for the purposes of flood mitigation, power generation and commercial navigation. Engineering modifications to the Mississippi River system have altered the river's sediment levels and channel morphology, but the influence of these modifications on flood hazard is debated. D...
Article
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To understand past and future sea-level variability, it is important to know if during an interglacial the eustatic sea level is constant or oscillates by several meters around an average value. Several field sites within and outside the tropics have been interpreted to suggest such oscillations during Marine Oxygen Isotope Stage (MIS) 5e (129–116...
Article
Full-text available
Major deltas and their adjacent coastal plains are commonly linked by means of coast-parallel fluxes of water, sediment, and nutrients. Observations of the evolution of these interlinked systems over centennial to millennial timescales are essential to understand the interaction between point sources of sediment discharge (i.e., deltaic distributar...
Article
Full-text available
Quaternary sea-level cycles have caused dramatic depocentre shifts near the mouths of major rivers. The effects of these shifts on fault activity in passive margin settings is poorly known, as no studies have constrained passive margin fault throw-rate variability over 10^3 to 10^5 year time scales. Here we present 11 mean throw rates for the Tepet...
Article
The present study is based on a suite of surface samples from exposures of eroded laterite, considered to be Tertiary in age, and nearby soils in the Sahelian region of SW Niger and Burkina Faso. X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Computer Controlled Scanning Electron Microscopy (CCSEM), Energy Dispersive X-ray Spectroscopy (EDS), D...
Article
Full-text available
Many of the world's deltas – home to major population centers – are rapidly degrading due to reduced sediment supply, making these systems less resilient to increasing rates of relative sea-level rise. The Mississippi Delta faces some of the highest rates of wetland loss in the world. As a result, multibillion dollar plans for coastal restoration b...
Presentation
Full-text available
The Lower US Atlantic Coastal Plain consists of multiple packages of Pleistocene interglacial coastal deposits that are valuable for investigating climate change, sea-level variability, and regional tectonic movements. Although the deposits were recognized about 80 years ago and have been subject to many studies, their ages are uncertain in many lo...
Article
Investigations at the Carson site (22CO505), located in Coahoma County, Mississippi, have uncovered data on the development of a large Mississippian mound center dating to the period from A.D. 1200 through European contact. Recent sediment coring, excavation, artifact analyses, and radiocarbon and optically stimulated luminescence (OSL) dating shed...
Article
Full-text available
Study region: The Mississippi Delta in southern Louisiana, United States. Study focus: The probable role that microbial respiration plays in As release from the shallow aquifer sediments. New hydrological insights for the region: Shallow groundwaters in southern Louisiana have been reported to contain elevated As concentrations, whereas mechanisms...
Article
Using an uncontaminated fast component is a key for improving the reliability of quartz OSL dating for many deposits. So far no approach to extract the fast component of quartz OSL has routinely been adopted for dating practice. Key challenges for extracting fast components are (1) the difficulty of finding a unique solution in curve-fitting deconv...
Conference Paper
Spanning over 4,000 km ² and encompassing a significant portion of four counties in southernmost Texas lays the South Texas Sand Sheet (STSS). Despite it being a physiographic boundary, a recharge area for local aquifers, an archive of climate change and a natural corridor for prehistoric human travel, basic knowledge of the STSS is still lacking....
Conference Paper
The surface geology of the central US Atlantic coastal plain is a sand-dominated coast with paleo-beach ridge complexes formed parallel to previous shorelines. These paleo-beach ridges can give valuable insight into relative sea-level (RSL) in the past. The chronology of these ridges, however, has been a subject of controversy. This study investiga...
Article
Full-text available
The common view that frequent overbank flooding leads to gradual aggradation of alluvial strata on floodplains and delta plains has been challenged by a variety of studies that suggest that overbank aggradation occurs in a strongly episodic fashion. However, this remains a largely untested hypothesis due to the difficulty in establishing age models...
Article
Full-text available
This study aims to describe the spatial and temporal characteristics of human infections with H7N9 virus in China using data from February 2013 to March 2014 from the websites of every province's Population and Family Planning Commission. A human infection with H7N9 virus dataset was summarized by county to analyze its spatial clustering, and by da...
Article
A beach deposit on the southern end of the Baudo Mountain Range, at an elevation of ∼2.0 m above the backshore of the modern beach, was dated at ∼2,870 years using optically stimulated luminescence dating. The calculated average uplift rate necessary to raise this deposit is 0.7 mm/yr. This rate combines the long-term regional deformation associate...
Article
Full-text available
The processes responsible for land-surface subsidence in the Mississippi Delta (MD) have been vigorously debated. Numerous studies have postulated a dominant role for isostatic subsidence associated with sediment loading. Previous computational modeling of present-day vertical land motion has been carried out in order to understand geodetic data. W...
Article
Modern Mississippi Delta sediments were analyzed to investigate quartz OSL signal resetting in large river deltas and test the accuracy of OSL dating on a decadal time scale with the early background subtraction and a recently proposed burial dose estimation procedure. Both fine silt-sized and sand-sized quartz were measured with a modified single-...
Article
Full-text available
The Lower Mississippi Valley provides an exceptional field example for studying the response of a continental-scale alluvial system to upstream and downstream forcing associated with the large, orbitally controlled glacial-interglacial cycles of the late Quaternary. However, the lack of a numerical chronology for the widespread Pleistocene strata a...
Article
Full-text available
Thermally transferred optically stimulated luminescence (TT-OSL) of quartz is the low intensity OSL measured after heating a previously optically zeroed quartz to temperatures below that erasing the OSL electron trap. We identify the source traps contributing to TT-OSL by studying the changes in TT-OSL and thermoluminescence (TL) caused by optical...
Article
To determine an equivalent dose (De), the initial signal of the CW-OSL decay curve, supposedly dominated by the fast component, is used. Previous studies suggest that the resulting De however, may be underestimated if thermally unstable medium or slow components are part of the initial decay curve. The De(t) plot has the potential to reveal the “un...
Article
An extensive database of radiocarbon dated alluvial fan and hill-slope gully systems identifies three phases of extensive hill-slope gullying after 2200, between 1250 and 700, and after 500 cal. BP in the uplands of northwest England. Regional pollen records reveal co-incident phases of increased human activity in these uplands, with small scale te...
Conference Paper
The catastrophic drainage of proglacial lakes Agassiz and Ojibway (LAO) in the early Holocene is widely believed to have triggered the 8.2 ka cold event. The timing of the LAO drainage, however, remains poorly constrained, which impedes our understanding of the abruptness of this climate change in response to a rapid freshwater forcing. Dating of t...
Article
Full-text available
To reconstruct Lateglacial and Holocene environmental changes in the British uplands, two c. 5.8 m long sediment cores from Crummock Water (NW England), together with several hundred soil samples from the Crummock Water catchment, were studied using magnetic techniques. Optically stimulated luminescence (OSL) dating using fine silt quartz and 14C d...
Article
Optically stimulated luminescence of fine silt quartz was investigated to establish chronologies for lake sediments from the British Isles. Feldspar contamination and its potential effects on equivalent dose (De) determination were examined. A new feldspar contamination test based on the thermal quenching of quartz OSL and thermal assistance of fel...

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Projects

Projects (4)
Project
To reconstruct palaeoenvironmental changes from sedimentary evidence recorded in fluvial basins.
Project
This study aims to identify extreme flood signals in oxbow lake sediments and generate a record of extreme paleoflood discharge that extends beyond available instrumental and historical data. This dataset will be used to assess how changes in flood frequency and intensity of the Pee Dee River may be related to anthropogenic climate change, climate modes, land use, and river engineering.
Project
Here we parse processes of deltaic evolution through newly developed geochronology datasets from the Mississippi Delta. This allows us to explore natural versus human-driven landscape change, and to investigate how people may establish and maintain sustainable infrastructure in naturally ephemeral coastal landscapes over past, present, and future timescales.