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Slow Slip Phenomena and Plate Boundary Processes

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Last updated:
24 August 2017
Associate Editors: Heidi Houston, Yoshihiro Ito, Allen Husker, and Satoshi Ide

Slow slip is a new kind of fault slip behavior found predominantly on the boundaries between tectonic plates. In addition to geodetically-observed slow deformation, possible signatures of slow slip include several diverse phenomena often associated with slow slip including tremor, low-frequency earthquakes, and slowly-migrating triggered seismicity. This theme encompasses observational, theoretical, modelling, and laboratory studies focusing on any of these aspects of slow slip, or their implications for fault mechanics or earthquake hazard. The February 2016 Chapman Conference on Slow Slip Phenomena highlighted current understanding in the field and served as the catalyst for this collection. However, the call for papers includes other work that falls within the theme.

This Theme is open to submissions jointly in Geochemistry, Geophysics, Geosystems and JGR-Solid Earth.



The Arctic: An AGU Joint Special Collection

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Last updated:
24 August 2017
The Arctic has become the focus of many new investigations and studies across a number of disciplines. In many cases, this research is integrating diverse new data sets, observations, and modeling, and making connections among and across the biosphere, oceans, atmospheres, space, and geophysical environments. These papers include historical and new research on the Arctic and represent the following AGU journals: Earth’s Future, Earth and Space Science, Geochemistry Geophysics Geosystems (G-Cubed), Geophysical Research Letters, Global Biogeochemical Cycles, JAMES (Journal of Advances in Modeling Earth Systems), JGR: Oceans, JGR: Atmospheres, JGR: Solid Earth, JGR: Space Physics, JGR: Biogeosciences, JGR: Earth’s Surface, Reviews of Geophysics, Space Weather, and Water Resources Research.

Subduction processes in Central America with an emphasis on CRISP results

Published:
1 July 2014
Associate Editors: Paola Vannucchi, Robert Harris, Nathan Bangs, Guillermo Alvarado Indumi

The Central American subduction system is characterized by abundant seismicity and a prominent volcanic arc in an erosive convergent margin setting. These processes are controlled, among other parameters, by material pathways, fluid-rock interactions and reactions from the shallower to the deeper levels of subduction. We invite studies focused on the Central American subduction system that seek to develop a better understanding of the physical conditions and processes at work in the interior of the subduction zone and along the subduction thrust interface. The goal is to better understand processes controlling the origin of natural hazards at subduction zones, in particular, earthquake nucleation and rupture. International scientific focus on the Central American subduction system has resulted in a wealth of detailed datasets that include the recent acquisition of 3D reflection seismics and drilling of IODP Expeditions 334 and 344 offshore southern Costa Rica. We seek to bring together contributions from all disciplines involved with the exploration of the Central America subduction system from the incoming plate to its arc and behind-arc magmatism, with a special focus on high-resolution offshore studies, lithospheric and crustal-scale constraints on deformation processes from geophysics, geochemistry, petrology and field-based studies.





Carbon degassing through volcanoes and active tectonic regions

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Last updated:
11 July 2017

Guest editors: Tobias Fischer, Alessandro Aiuppa, Marie Edmonds

Carbon exchange between the Earth’s interior, the atmosphere and hydrosphere plays a fundamental role in planetary and atmospheric evolution. The main identified pathways of carbon release from the solid Earth are volcanoes and regions of diffuse degassing in tectonically active areas, yet the quantities, sources, variability and processes of carbon release remain poorly constrained. This special theme is on the observations, quantification and models of carbon transfer from the Earth’s crust and mantle to the surface. It includes emphasis on temporal and regional degassing variability, utilization of carbon degassing as volcano and earthquake monitoring tool, and interdisciplinary approaches to quantify carbon emissions. The theme includes results from the Deep Carbon Observatory Deep Earth Carbon Degassing (DCO-DECADE) initiative as well as contributions from the broader community interested in carbon exchange on Earth.

The Lithosphere-Asthenosphere Boundary

Published:
1 January 2015
Associate Editors: Meghan S. Miller, Barbara Romanowicz, Alan G. Jones, Clint P. Conrad, Suzanne Y. O'Reilly.
Lithosphere and asthenosphere are fundamental concepts of plate tectonics and continental evolution, yet their properties, origin, and evolution are poorly understood. This special section is on the multi-disciplinary observations and models that pertain to the concept of the lithosphere-asthenosphere system, and in particular the lithosphere- asthenosphere boundary (LAB), as well as possible mid-lithospheric discontinuities (MLD). This theme expands on a successful previous one on the "Lithosphere asthenosphere boundary", and the recent workshop on the "Structure and Dynamics of the Lithosphere-Asthenosphere System" serves to highlight some of the remaining issues. This workshop was held at the College de France, Paris, in November 2013 (organizers: B. Romanowicz and C. Jaupart), and contributions from workshop participants are particularly, but not exclusively, encouraged. We invite submissions from all disciplines discussing the nature and evolution of the MLD and LAB, and the dynamic interactions of the lithosphere with the crust and mantle throughout Earth history, within the context of mantle convection and fractionation.







FRONTIERS IN GEOSYSTEMS: Deep Earth – surface interactions

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Last updated:
2 June 2017
Associate Editors: Cin-Ty Lee, Janne Blichert-Toft, Yusuke Yokoyama

The recent years have seen progress in our understanding of the quantitative links between long-term Earth evolution as accommodated in the deep Earth and the evolution of the Earth’s surface systems including the ocean, atmosphere, and biosphere. This special collection consists of cutting-edge, provocative perspectives on a range of issues that have recently been tackled in this field. Those include the interactions between glacial cycles, volcanism, and climate; the link between long-term plate tectonic evolution, mantle structure, and eruption of large igneous provinces; the role of the mantle in controlling the geodynamo; feedbacks between weathering of continental and oceanic crust, tectonics, orogeny and the climate system; long term sea level variations, mantle convection, and climate; the interactions between the interior and the biosphere for the progressive rise of oxygen; and links between mantle convection and mass extinctions.

Magnetism From Atomic to Planetary Scales: Physical Principles and Interdisciplinary Applications in Geosciences and Planetary Sciences

Published:
1 January 2015
Associate Editors: Joshua Feinberg, Suzanne McEnroe, Bruce Moskowitz, Hirokuni Oda, Michael Purucker, Andrew P. Roberts

Magnetic measurements and imaging provide unique and valuable data for a wide range of applications in the geosciences and planetary sciences, notably in tectonics, paleoclimate and paleoenvironmental research, studies of the Earth's deep interior, and exploration of planetary surfaces and interiors. This theme includes modeling and studies of atomic and nanoscale magnetic properties as well as satellite, airplane, ship, and undersea surveys and imaging to illuminate the frontiers of magnetic science. This is a continuation of the theme originally organized by theme editors B. Moskowitz, J. Feinberg, F. Florindo, and A. Roberts from 2008 through 2011.

Clumped Isotope Geochemistry: From Theory to Applications

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Last updated:
3 February 2017
Associate Editors: Aradhna Tripati, John Eiler, Stefano Bernasconi, Cedric John

Clumped isotope geochemistry involves studying the properties of isotopic species that contain more than one rare isotope. Measurements can shed light on a broad range of topics of interest to geoscientists, including geothermometry, biomineralization, tectonics, diagenesis, atmospheric budgets, and rates of geochemical processes. A major focus is geothermometry, as temperature is a fundamental intensive variable in any physical system and accurate estimates of temperatures are a requirement for understanding most geological processes. This special issue will include papers dealing with all aspects of clumped isotope geochemistry in different molecules and minerals, including methodological advances, theoretical studies, laboratory experiments, and applications to modern and ancient systems.



Wilson Cycles and the Formation of Marginal Basins: Rifting Dynamics and Mantle Evolution from Mid-ocean Ridge Creation to Extinction

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Last updated:
29 December 2016
Associate Editors: Anne Briais, Chun-Feng Li, Jian Lin, Anthony Koppers
Marginal basins develop at the frontier between continents and large oceans, or within oceanic plates, through the tearing of continental lithosphere or volcanic arc terrains. The forces acting on these smaller blocks moving apart are more complex than those driving the motion of the major plates. In these confined, miniature oceans, processes are different from those shaping the larger oceans, including lithospheric stretching, mantle melting, spreading inception and extinction, ridge dynamics, and sedimentary responses. The South China Sea is an excellent natural laboratory to study these processes, as it evolved at the boundary between three major plates: Eurasia, Pacific and India-Australia, and its spreading ridge is now extinct. It has witnessed surging interests in recent years, with extensive geophysical surveys and IODP expeditions. The first expedition of the International Ocean Discovery Program on South China Sea tectonics (IODP Expedition 349, 2014) targeted the oceanic crust and the continent-ocean transition zone of the South China Sea, successful coring through thick sedimentary cover to the basaltic basement. Two more IODP expeditions have already been scheduled, focusing exclusively on the continent-ocean transition zone (IODP Expeditions 367 and 368, 2017). These studies help address fundamental problems of continental breakup, mantle melting, oceanic lithosphere evolution, and terminal processes of seafloor spreading.  Our goal is to better understand how marginal basins evolve within the larger Wilson Cycle and how the formation of those basins have responded to continental collision and active margin deformation. The G3 theme will integrate geological and geodynamic processes, before, during, and after the opening of marginal and back-arc basins around the world, for example the South China, Sulu and Andaman Seas, the Shikoku Basin and Mariana Trough, the Tyrrhenian Sea and Alboran Basin, and others.

Magnetism From Atomic to Planetary Scales: Physical Principles and Interdisciplinary Applications in Geoscience

Published:
1 December 2011
Magnetic measurements provide unique and valuable data for a wide range of applications in the geosciences, notably in tectonics, paleoclimate and paleoenvironmental research, and studies of the Earth's deep interior.