Changyeol Lee- PhD in Geophysics
- Professor (Associate) at Yonsei University
Changyeol Lee
- PhD in Geophysics
- Professor (Associate) at Yonsei University
subduction and plume processes
About
36
Publications
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Introduction
Advertisement: A post-doc. position is open in the field of computational geodynamics. An applicant should contact me with a CV and research interests through changyeol.lee@yonsei.ac.kr
Skills and Expertise
Current institution
Additional affiliations
March 2022 - present
March 2019 - present
March 2016 - February 2019
Education
May 2007 - October 2010
March 1999 - February 2004
Publications
Publications (36)
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...
Understanding water transport by the subducting slab and the corner flow of the mantle wedge is a crucial topic because it is a prime control on seismic tremors, arc-to-intraplate volcanoes as well as on global water distribution in the mantle. However, most of previous studies focused on water transport by the subducting slab and did not quantitat...
Plain Language Summary
Arc volcanoes form in subduction zones because the mantle beneath them experiences partial melting due to high temperature and the presence of water. Arc volcanoes in Northeast Japan and Izu‐Bonin, cluster together, indicating that temperature and water are not distributed uniformly in the underlying mantle wedge. Behind thes...
A warm slab thermal structure plays an important role in controlling seismic properties of the slab and mantle wedge. Among warm subduction zones, most notably in southwest Japan, the spatial distribution of large S-wave delay times and deep nonvolcanic tremors in the forearc mantle indicate the presence of a serpentinite layer along the slab inter...
The intraplate volcanism in East Asia exhibits large variations in the hydrous plume geometry and dynamic topography, but the geological processes that cause these variations remain unclear. The presence of hydrous minerals and melts within the small hydrous plumes (SHPs) formed from the stagnant Pacific slab in the mantle transition zone significa...
Fluid and melt transport in the solid mantle can be modeled as a two-phase flow in which the liquid flow is resisted by the compaction of the viscously deforming solid mantle. Given the wide impact of liquid transport on the geodynamical and geochemical evolution of the Earth, the so-called “compaction equations” are increasingly being incorporated...
The process of small-scale mantle plume emplacement within the continental lithosphere influences the dynamic topography and architecture of the lithosphere-asthenosphere boundary (LAB). Furthermore, plume emplacement alters the rheology of the crust and lithospheric mantle through melt-driven, mechanical and thermal weakening. Previous studies of...
The weak slab interface controls long-term subduction dynamics. A weak hydrous layer at the slab interface promotes mechanical decoupling between the forearc mantle and the subducting slab and converts a hot forearc mantle to a cold mantle. Often referred to as a cold nose, the cold forearc mantle, plays a key role in the transition from subduction...
Fluid and melt transport in the solid mantle can be modeled as a two-phase flow in which the liquid flow is resisted by the compaction of the viscously deforming solid mantle. Given the wide impact of the liquid transport on the geodynamical and geochemical evolution of the Earth, the so-called “compaction equations” are more and more incorporated...
Despite the decreases in temperature and permeability of oceanic plates with increasing age, hydrothermal circulation (HC) can be rejuvenated in the 130-Ma old Pacific plate in the vicinity of the Japan Trench, substantially affecting the thermal structure and remaining amount of magnetization (RAM). To decipher the roles of HC in the thermal struc...
Arc volcanoes in global subduction zones are geographically focused regardless of subduction parameters, and the Japan subduction zone is an excellent natural laboratory to examine arc volcanoes because young and old oceanic plates subduct along southwest and northeast Japan, respectively. Compared with the arc volcanoes in southwest Japan, which a...
The Sunda Plate has shaped itself in a complex tectonic framework, driven by the interactions of multiple subduction zones in its history, which is currently bounded by two major N-S trending active trenches: Andaman-Sumatra-Java and Philippines on its western and eastern margins, respectively. The inter-trench distance (ITD,) varies from 3000 to 5...
The Quaternary intraplate volcanoes in Korea have a sparser distribution (~330–563 km) than that of Japanese arc volcanoes (~80 km), geochemistry indicating mixing of components from the stagnant slab and mantle transition zone, and a longer elapsed time (~10–20 Myr) of the Quaternary eruption after the stagnation of the Pacific Plate. Although vol...
Nankai Trough highlights characteristic hydrothermal anomaly along the contact of Eurasian-Philippine Oceanic Plates. To elucidate geologic features governing the hydrothermal distribution within subduction zones, a series of numerical simulations were conducted with emphasis on subsea topography, basal heat inflow variations with consideration of...
Oceanic plate subduction can exert extensional, compressional or both types of deformations simultaneously in overriding plates. In this study, we explore the factors controlling these two competing modes of deformation in response to contrasting stress fields. Two-dimensional computational fluid dynamics models are presented to show that the dip a...
Along-strike geochemical variations of the Quaternary volcanic rocks in southern Kermadec are classified into two types, “arc-type” (e.g., Rumble V Ridge) and “rift-type” basalts (e.g., Ngatoro Rift), that indicate partial melting and no melting of the subducted sediment, respectively. A recent geochemical study attributed the arc-type basalts to t...
Recent studies show that the Cretaceous intracontinental and arc tectonomagmatism in Northeast Asia resulted from the intracontinental mantle plume under the North China Craton and its channel-like flow that was dragged into the underneath of the ancient arc, respectively. Although the southwest-to-northeast migration of the channel-like flow in th...
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...
The Cretaceous tectonomagmatism of the Korean Peninsula was examined based on geochemical and geochronological data of the Cretaceous plutonic rocks, along with distribution of volcano-sedimentary nonmarine N- to NE-trending fault bounded sedimentary basins. We conducted sensitive high-resolution ion microprobe (SHRIMP) zircon U–Pb ages and whole-r...
The pulse-like eruption of the Abukuma adakite in Northeast Japan at ~. 16. Ma has previously been explained by localized and short-term (pulse-like) plume-slab interaction, where the plume ascended through a slab neck that developed in the subducted Pacific plate. However, because previous research was based on a two-dimensional (2D) model, consid...
For decades, the migration of Cretaceous adakitic arc magmatism from South China to eastern Japan in East Asia was considered to be a result of simultaneous southwest‐to‐northeast migration of the subducting Izanagi‐ Pacific ridge, which resulted in partial melting of subducted oceanic crust. However, a recent global plate recon struction model sh...
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 Geopar...
We review geophysical and geochemical properties in the vicinity of the stagnant Pacific slab beneath northeast China, Korea and Japan to understand the origin and current state of intraplate volcanism in East Asia. East Asia has been susceptible to intensive volcanism since the Cretaceous. In particular, during the Cenozoic, Jeju Island, Korea is...
Baegdusan (Changbai) volcano Ulleung volcano Tephra Intraplate volcano Arc volcano a b s t r a c t The intraplate Baegdusan (Changbai) and Ulleung volcanoes located on the border of China, North Korea, and East/Japan Sea, respectively, have been explained by appeals to both hotspots and asthenospheric mantle upwelling (wet plume) caused by the stag...
The effects of radiogenic heat production and mantle
compressibility on the behaviors of Venus’ and Earth’s mantle
and lithosphere are evaluated using a series of two-dimensional
Cartesian numerical models with pressure- and temperature-dependent
rheology. The main findings of the numerical model experiments
are summarized as follows. 1) Radiogenic...
Ever since the early days of the development of plate tectonic theory, subduction zones have been engrained in geological thinking as the place where steady, linear slabs descend into the mantle at a constant, uniform dip angle beneath volcanic arcs. However, growing evidence from geological and geophysical observations as well as analog and numeri...
High-Mg# andesites are thought to be derived from partial melting
of subducting oceanic basalts. Slab thermal modeling has shown
that this requires a young (<25 Ma), very shallow (fl at) slab and/or
high shear stresses along the slab surface. These conditions currently
do not exist in the Aleutian arc, the typical locality of high-Mg# andesites.
Us...
Benchmark comparisons are an essential tool to verify the accuracy and validity of computational approaches to mantle convection. Six 2-D Cartesian compressible convection codes are compared for steady-state constant and temperature-dependent viscosity cases as well as time-dependent constant viscosity cases. In general we find good agreement betwe...
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 c...
Questions
Question (1)
Dear all,
I am curious about this 'simple' hydrology setup; fluid flow along the highly permeable foliation.
As shown in the attached note, I would like to calculate the fluid flow along the foliation (enclosed by red lines). I assume that the permeability along the foliation (Kp) is 100 times the permeability normal to the foliation: Kp = 100 Kn.
To make the setup simple, I only consider the buoyancy of the fluid (density difference between the background solid and fluid). So, the velocity equation can be written as shown in the note.
Because I used the permeability anisotropy, the permeability should be a tensor. After solving the equation, I have Vf_x and Vf_y for the x- and y-direction velocity. Because of the permeability anisotorpy, I have the x-direction velocity even if the gravity is the only force.
But, some people argues that the horizontal fluid flow is not possible in this frame because the gravity is only working along the y-direction. They say that the horizontal pressure gradient (del_P) should be required for the horizontal fluid flow. When I listen this, it seems right but, I am very curious about what's is wrong with my note, which clearly shows the horizontal velocity??
This may be a simple issue to someone. Please let me clarify my understand.
Thanks in advance!
Best,
Changyeol
