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Mercury isotopes in eclogites constrain the sources and fates of mercury during oceanic subduction and continental collision.
Sci Bull (Beijing)
December 2024
State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China. Electronic address:
A deeper and hotter Martian core-mantle differentiation inferred from FeO partitioning.
Sci Bull (Beijing)
December 2024
State Key Laboratory of Lithospheric and Environmental Coevolution, University of Science and Technology of China, Hefei 230026, China; Deep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.
The core-mantle differentiation process plays a pivotal role in redistributing material on a massive scale, shaping the long-term evolution of rocky planets. Understanding this process is crucial for gaining insights into the accretion and evolution of planets like Mars. However, the details of Mars's core-mantle differentiation remain poorly understood due to limited compositional data for its core and mantle.
View Article and Find Full Text PDFFine-scale Southern California Moho structure uncovered with distributed acoustic sensing.
Sci Adv
November 2024
California Institute of Technology, Pasadena, CA, USA.
Moho topography yields insights into the evolution of the lithosphere and the strength of the lower crust. The Moho reflected phase (PmP) samples this key boundary and may be used in concert with the first arriving P phase to infer crustal thickness. The densely sampled station coverage of distributed acoustic sensing arrays allows for the observation of PmP at fine-scale intervals over many kilometers with individual events.
View Article and Find Full Text PDFRapid shear zone weakening during subduction initiation.
Proc Natl Acad Sci U S A
October 2024
Division of Geological and Planetary Sciences, Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125.
Subduction zones play a pivotal role in the mechanics of plate tectonics by providing the driving force through slab pull and weak megathrusts that facilitate the relative motion between tectonic plates. The initiation of subduction zones is intricately linked to the accumulation of slab pull and development of weakness at plate boundaries and, by consequence, the largest changes in the energetics of mantle convection. However, the transient nature of subduction initiation accompanied by intense subsequent tectonic activity, leaves critical evidence poorly preserved and making subduction initiation difficult to constrain.
View Article and Find Full Text PDFUnraveling abiotic organic synthesis pathways in the mafic crust of mid-ocean ridges.
Proc Natl Acad Sci U S A
October 2024
Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China.
Article Synopsis
- - The study investigates how the alteration of the oceanic lithosphere contributes to the energy necessary for creating organic compounds, which are essential for the deep carbon cycle and possibly the origins of life.
- - Researchers found a specific relationship between aliphatic carbonaceous matter and iron oxyhydroxides in rocks from the Southwest Indian Ridge (SWIR) and explored potential pathways for abiotic organic synthesis.
- - Using advanced techniques, including quantum mechanical modeling, the study suggests that iron oxyhydroxides may facilitate the formation of carbon-carbon bonds, highlighting the SWIR as a promising location for low-temperature organic synthesis.
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