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Geosciences, Volume 8, Issue 11

November 2018 - 43 articles

Cover Story: Coral tsunami boulders in Ishigaki Island, Japan showed a measurable intensity of remanent magnetization, although it is well known that corals skeletons have extremely weak remanent magnetization. To know what the origin of remanence is, in this study, we characterized magnetic assemblages in this coral skeleton to determine whether it is of biogenic or detrital magnetite using first-order reversal curve (FORC) measurements, ferromagnetic resonance (FMR) spectroscopy, and petrological observations through field-emission type scanning electron microscope (FE-SEM) with an acid treatment. Our findings indicate that the magnetic assemblage in coral tsunami boulders consists of biogenic-origin single-domain magnetites with a trace amount of detrital component. Therefore, fossil coral skeletons in Ishigaki Island have great potential for utilization for paleomagnetic studies. View this paper
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Articles (43)

  • Communication
  • Open Access
18 Citations
4,933 Views
15 Pages

Ball Milling Effect on the CO2 Uptake of Mafic and Ultramafic Rocks: A Review

  • Ioannis Rigopoulos,
  • Ioannis Ioannou,
  • Andreas Delimitis,
  • Angelos M. Efstathiou and
  • Theodora Kyratsi

Mineral carbonation is considered to be the most stable mechanism for the sequestration of CO2. This study comprises a comparative review of the effect of ball milling on the CO2 uptake of ultramafic/mafic lithologies, which are the most promising ro...

  • Article
  • Open Access
59 Citations
7,027 Views
19 Pages

Automatic Coastline Extraction Using Edge Detection and Optimization Procedures

  • Vasilis Paravolidakis,
  • Lemonia Ragia,
  • Konstantia Moirogiorgou and
  • Michalis E. Zervakis

Coastal areas are quite fragile landscapes as they are among the most vulnerable to climate change and natural hazards. Coastline mapping and change detection are essential for safe navigation, resource management, environmental protection, and susta...

  • Article
  • Open Access
4 Citations
4,780 Views
15 Pages

Snow microstructure is an important factor for microwave and optical remote sensing of snow. One parameter used to describe it is the specific surface area (SSA), which is defined as the surface-area-to-mass ratio of snow grains. Reflectance at near...

  • Article
  • Open Access
5 Citations
4,849 Views
17 Pages

The active debate about the processes governing the organic-rich sediment deposition generally involves the relative roles of elevated primary productivity and enhanced preservation related to anoxia. However, other less spotlighted factors could hav...

  • Article
  • Open Access
7 Citations
5,077 Views
17 Pages

Dark, coniferous hemiboreal forests in the south of West Siberia are located in the Holocene forest-steppe ecotone, where natural environmental conditions have been quite dynamic. This dynamic environment resulted in the contrasting evolution of regi...

  • Correction
  • Open Access
1 Citations
3,368 Views
4 Pages

The authors would like to correct the published article [...]

  • Article
  • Open Access
43 Citations
5,965 Views
13 Pages

Changes induced by climate change in salt weathering of built cultural heritage are estimated in different ways, but generally as a function of phase changes phenomena of two common salts, sodium chloride and sodium sulfate. We propose to use not onl...

  • Article
  • Open Access
3 Citations
4,602 Views
11 Pages

Skeletons of hermatypic corals (e.g., Porites) might have enormous potential as a high-resolution paleomagnetic recorder owing to their rapid and continuous growth over hundreds of years at a rate of up to 2 cm/year, although typical corals show an e...

  • Article
  • Open Access
12 Citations
4,246 Views
18 Pages

Crystalline bedrock has been chosen for deep geologic long-term storage of used nuclear fuel in Finland. The risks generated by the deep subsurface microbial communities in these disposal sites need to be well characterised in advance to ensure safet...

  • Article
  • Open Access
21 Citations
4,818 Views
18 Pages

Heavy metal abundance and potential environmental risks are reported for surface sediments (n = 21) from the Port of Koper area, Republic of Slovenia. The enrichment factor (EF) indicates minor enrichment in arsenic (As), cadmium (Cd), copper (Cu), m...

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Geosciences - ISSN 2076-3263