Chang-Yeol Lee

The heat generated by viscous dissipation is consistently evaluated using a 2‐D compressible subduction model with variations of mantle rheology (constant as well as pressure and temperature dependent viscosity), dip, age, and velocity of the subducting slab. For comparison, we also conduct 2‐D incompressible subduction calculations with the same conditions and parameters used in the compressible formulation. The effect of compressibility on the thermal and flow structures of the subduction zone

Clustering of arc volcanoes in subduction zones indicates along-arc variation in the physical condition of the underlying mantle where majority of arc magmas are generated. The sub-arc mantle is brought in from the back-arc largely by slab-driven mantle wedge flow. Dynamic processes in the back-arc, such as small-scale mantle convection, are likely to cause lateral variations in the back-arc mantle temperature. Here we use a simple three-dimensional numerical model to quantify the effects of bac

Research Article| July 01, 2010 Why are high-Mg# andesites widespread in the western Aleutians? A numerical model approach Changyeol Lee; Changyeol Lee Virginia Polytechnic Institute and State University, Department of Geosciences, 4044 Derring (0420), Blacksburg, Virginia 24061, USA Search for other works by this author on: GSW Google Scholar Scott D. King Scott D. King Virginia Polytechnic Institute and State University, Department of Geosciences, 4044 Derring (0420), Blacksburg, Virginia 2406

The fungal strain Alternaria alternata JS0515 was isolated from Vitex rotundifolia (beach vitex). Twelve secondary metabolites, including one new altenusin derivative (1), were isolated. The isolated metabolites included seven known altenusin derivatives (2–8), two isochromanones (9, 10), one perylenequinone (11), and one benzocycloalkanone (12). Their structures were determined via 1D and 2D nuclear magnetic resonance (NMR) spectroscopy, mass spectrometry (MS), and computational electronic circ

Mount Mudeung National Geopark (MMNG), Gwangju, Republic of Korea (1187 masl), is known for its huge, broad occurrences of columnar jointed colonnades in the Cretaceous Mudeungsan Tuff. To understand the genesis of columnar joints infilling a volcanic vent, integrated geochemical and geophysical studies were conducted. Most colonnades in the Geopark are located in regions higher than 700 masl and show elevation-dependent variations in the mean face width of the columns. These mean widths are app

-wave delay times in the forearc mantle. The serpentinite layer then allows continuous free-fluid flow toward the corner of the mantle wedge, presenting possible mechanisms for the deep nonvolcanic tremors in the forearc mantle.

Abstract The Quaternary volcano clusters in Northeast Japan and the no‐volcano zones between them imply extensive and scarce melting, respectively, in the mantle wedge, but no quantitative study on the heterogeneous melting has been conducted. Here, we constructed two‐dimensional numerical models by considering along‐arc temperature variations in the mantle wedge expressed as high‐ (hot fingers) and low‐temperature anomalies (deterred corner flow) with the slab dehydration, porous flow of aqueou