53 research outputs found
Mariana Serpentinite Mud Volcanism Exhumes Subducted Seamount Materials: Implications for the Origin of Life.
The subduction of seamounts and ridge features at convergent plate boundaries plays an important role in the deformation of the overriding plate and influences geochemical cycling and associated biological processes. Active serpentinization of forearc mantle and serpentinite mud volcanism on the Mariana forearc (between the trench and active volcanic arc) provides windows on subduction processes. Here, we present (1) the first observation of an extensive exposure of an undeformed Cretaceous seamount currently being subducted at the Mariana Trench inner slope; (2) vertical deformation of the forearc region related to subduction of Pacific Plate seamounts and thickened crust; (3) recovered Ocean Drilling Program and International Ocean Discovery Program cores of serpentinite mudflows that confirm exhumation of various Pacific Plate lithologies, including subducted reef limestone; (4) petrologic, geochemical and paleontological data from the cores that show that Pacific Plate seamount exhumation covers greater spatial and temporal extents; (5) the inference that microbial communities associated with serpentinite mud volcanism may also be exhumed from the subducted plate seafloor and/or seamounts; and (6) the implications for effects of these processes with regard to evolution of life.
This article is part of a discussion meeting issue ‘Serpentine in the Earth system’
A reversible lesion of the corpus callosum splenium with adult influenza-associated encephalitis/encephalopathy: a case report
<p>ABstract</p> <p>Introduction</p> <p>Influenza virus-associated encephalitis/encephalopathy is a severe childhood illness with a poor prognosis. Adult case reports are rare and, to date, there have been no reports of adults with a mild subcortical encephalopathy with reversible lesions of the corpus callosum splenium.</p> <p>Case presentation</p> <p>A previously healthy 35-year-old man presented with acute progressive tetraplegia, transcortical motor aphasia and a mild decrease in his consciousness during his recovery after receiving oseltamivir phosphate treatment, and influenza type A antiviral medication. The initial magnetic resonance imaging study at day 1 showed symmetrical diffuse lesions in the white matter and a lesion on the central portion of the corpus callosum splenium. These findings had resolved on follow-up studies at day 8 and day 146. His neurological deficits mostly recovered within 12 hours following methylprednisolone pulse therapy. The levels of interleukin-6 and interleukin-10 in his blood and cerebrospinal fluid were initially elevated, but rapidly decreased to normal levels by day 8.</p> <p>Conclusion</p> <p>It is important for clinicians to recognize that even in adulthood, the subcortical encephalopathy observed during the therapeutic treatment for influenza type A infection can occur in conjunction with a reversible lesion of the corpus callosum, which may recover quickly. In addition, the cytokine storm in the blood system and the corticospinal cavity may play an important role in the etiology of the disease process.</p
Mariana serpentinite mud volcanism exhumes subducted seamount materials: implications for the origin of life
The subduction of seamounts and ridge features at convergent plate boundaries plays an
important role in the deformation of the overriding plate and influences geochemical cycling
and associated biological processes. Active serpentinization of forearc mantle and serpentinite
mud volcanism on the Mariana forearc (between the trench and active volcanic arc) provides
windows on subduction processes. Here, we present (1) the first observation of an extensive
exposure of an undeformed Cretaceous seamount currently being subducted at the Mariana
Trench inner slope; (2) vertical deformation of the forearc region related to subduction of Pacific
Plate seamounts and thickened crust; (3) recovered Ocean Drilling Program and International
Ocean Discovery Program cores of serpentinite mudflows that confirm exhumation of various
Pacific Plate lithologies, including subducted reef limestone; (4) petrologic, geochemical and
paleontological data from the cores that show that Pacific Plate seamount exhumation covers
greater spatial and temporal extents; (5) the inference that microbial communities associated
with serpentinite mud volcanism may also be exhumed from the subducted plate seafloor
and/or seamounts; and (6) the implications for effects of these processes with regard to
evolution of life.Copyright 2020 The Authors. Published by the Royal Society under the terms of the
Creative Commons Attribution License http://creativecommons.org/licenses/
by/4.0/, which permits unrestricted use, provided the original author and
source are credited
Petrology of the permian mafic and ultramafic rocks in the inner zone of southwestern Japan
Geochemistry and magmatic zircon U–Pb dating of amphibolite blocks in the Omi serpentinite mélange, north central Japan: Possible subduction of the Cambrian oceanic crust
Early Miocene island arc tholeiite in the Mineoka Belt: Implications for genetic relationship with the Izu–Bonin–Mariana (IBM) arc
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