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Issues Published in 2024 -- Volume 20

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February 2024 – Volume 20 Number 1

Extraterrestrial Organic Matter

GUEST EDITORS
Mehmet Yesiltas and Yoko Kebukawa

PRINCIPAL EDITOR
Sumit Chakraborty

April 2024 – Volume 20 Number 2

Paired Metamorphic Belts of SW Japan: Metamorphic Records of a Subduction System

GUEST EDITORS
Simon R. Wallis, Kazuhiro Miyazaki, and Ulrich Knittel

PRINCIPAL EDITOR
Becky Lange

June 2024 – Volume 20 Number 3

Cratons to Continents

GUEST EDITORS Carol D. Frost and Paul A. Mueller
PRINCIPAL EDITOR Janne Blichert-Toft
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February 2024 -- Extraterrestrial Organic Matter

Extraterrestrial organic matter is found in various extraterrestrial environments and in various forms. It forms in a variety of locations through different mechanisms in space. As such, its nature, distribution, formation mechanisms and locations are of particular interest. Some organic molecules are even considered as key players for the emergence of life on Earth and possibly beyond. Therefore, their detection and characterization can contribute to the understanding of the early solar system evolution as well as the origin of life. Despite decades of work and research, there are still many questions and unknowns on this topic. The aim of this issue of Elements is to offer an overview of the concept of extraterrestrial organic matter as well as the latest scientific findings.

April 2024 -- Paired Metamorphic Belts of SW Japan: Metamorphic Records of a Subduction System

Subduction, where one plate dives beneath another, controls long­term whole­Earth cycling of rocks, fluids, and energy. Plates subduct faster than they heat up, making them the coldest parts of the Earth’s interior. Fluids released from these cold plates rise into hotter overlying rocks, forming magma that feeds surface volcanism. Cold deep conditions associated with subduction complemented by hot shallow conditions under volcanic arcs are reflected in the presence of pairs of metamorphic belts, representing sites of ancient subduction. This issue of Elements guides readers through a premier example of paired metamorphism: the Cretaceous Sanbagawa­Ryoke metamorphic pair of Japan. Estimates of pressure, temperature, the age and duration of metamorphism, and the tectonic framework in which meta­ morphism took place help us to develop quantitative models—both for the evolution of SW Japan and subduction systems in general.

June 2024 -- Cratons to Continents

Archean continental crust is present on every continent, but does not constitute a dominant part of any continent’s surficial exposures. Nevertheless, Archean cratons are the longest-­lived coherent physical structures on earth. Viewed holistically they comprise a welded com­bination of continental crust and as sub­continental lithospheric mantle keel. They are survivors of what may, or may not, have been a more numerous and varied population of protocontinents. Many of these crustal blocks have origins in the Hadean and have survived for billions of years through many super­ continent cycles. Consequently, these craton-­keel structures have influenced the physical and chemical evolution of the silicate earth. This issue of Elements provides an overview of Archean cratons and the information they retain about the early development of Earth’s continental crust.