Spatial and temporal variations of Boron contents of basaltic rocks from northern Kyushu, SW Japan arc

Major chemical exchange between the crust and mantle occurs in subduction zone environments, profoundly affecting the chemical evolution of Earth. The relative contributions of the subducting slab, mantle wedge, and arc lithosphere to the generation of island arc magmas, and ultimately new continental crust, are controversial. Isotopic data for lavas from a transect of volcanoes in a single arc segment of northern Honshu, Japan, have distinct variations coincident with changes in crustal lithology. These data imply that the relatively thin crustal lithosphere is an active geochemical filter for all traversing magmas and is responsible for significant modification of primary mantle melts.

Island arc

Crustal recycling

Volcanic arc

10.1126/science.272.5267.1464

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Citations (95)

A30 Arc magmatism at the incipient stage of formation of subduction zone : geochemistry of Eocene volcanic rocks from the Bonin Islands

Programme and abstracts the Volcanological Society of Japan (2009)

Kyoko Kanayama Susumu Umino Osamu Ishizuka

Volcanic arc

10.18940/vsj.2009.0_30

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The Role of Philippine Sea Plate to the Genesis of Quaternary Magmas of Northern Kyushu Island, Japan, Inferred from Along-Arc Geochemical Variations

AGUFM (2013)

Tomoyuki Shibata Masako Yoshikawa Jun’ichi Itoh Osamu Ujike Masaaki Miyoshi

Island arc

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Across-arc geochemical variations in the Southern Volcanic Zone, Chile (34.5- 38.0°S): Constraints on Mantle Wedge and Input Compositions

Guillaume Jacques Kaj Hoernle Folkmar Hauff Heidi Wehrmann James B. Gill

Wedge (geometry)

Volcanic arc

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Proterozoic Subduction-Related and Continental Rift-Zone Mafic Magmas from the Eastern Ghats Belt, SE India: Geochemical Characteristics and Mantle Sources

Current Science (2015)

K. Vijaya Kumar K. Rathna C. Leelanandam

Understanding the origin and growth of continental crust is a fundamental problem in geological sciences. Two distinct ways in which the continental crust grows include horizontal (subduction) and vertical (plume/extension) accretions. As the mantle reservoirs in these two tectonic settings are generated and/or modified by contrasting processes, the erupted melts offer clues on the nature of these divergent mantle sources. Trace element geochemistry is a robust tool to quantitatively model the mantle sources, melting mechanisms and relative roles of mantle and crust in the petrogenesis of magmatic rocks, which ultimately lead us to unravel the origin of continental crust. The present study portrays growth of the continental crust in the Proterozoic Eastern Ghats Belt, SE India. Mafic magmas within the Palaeoproterozoic Kondapalli-Kandra region illustrate subductionrelated island arc basalt-type geochemical signatures whereas alkali basaltic magmas in the Mesoproterozoic Prakasam continental rift-zone display ocean island basalt-type characteristics. Calculated mantle sources for subduction-zone and rift-related magmas display distinctly different geochemical traits. Mesoproterozoic gabbroic magmas in the Prakasam rift-zone exhibit geochemical signatures akin to the subduction-related mafic melts. This dichotomy of continental crust produced by intra-plate processes exhibiting plate-margin signatures advocates that we possibly have overestimated the proportion of continental crust generated above subduction zones.

Continental Margin

Mantle plume

Petrogenesis

10.18520/cs/v108/i2/184-197

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Citations (14)

Clinopyroxene trace element chemistry as a proxy for magma compositional variations in the Izu Bonin rear arc over the last 15 million years

AGU Fall Meeting Abstracts (2019)

K. Wurth Susan M. DeBari

Trace element

Proxy (statistics)

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Citations (2)