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Pervasive poorly crystalline Mg-rich hydrous silicate material in C-type asteroid matrices
Reon Okumura (Kanazawa University), Haruki Oya (Kanazawa University), Kosuke Inoue (Kanazawa University), Takuma Fujiya (Kanazawa University), Keisuke Fukushi (Kanazawa University, Institute of Nature and Environmental Technology, Kanazawa University), TAKAHASHI YOSHIO (The University of Tokyo), Ryoichi Nakada (Japan Agency for Marine-Earth Science and Technology), Mizuho Koike (Hiroshima University), Takahiro Kawai (Japan Synchrotron Radiation Research Institute, The University of Tokyo), Tomohiro Ono (The University of Tokyo), Shohei Yamashita (High Energy Accelerator Research Organization, Photon Factory), Yoko Kebukawa (Institute of Science Tokyo), Tomoyuki Mizukami (Kanazawa University)
Abstract: Abstract C-type asteroid-derived samples, including Ryugu and carbonaceous chondrites, consist primarily of fine-grained matrices of magnesium-rich hydrous silicates formed by aqueous alteration. These matrices are commonly interpreted as mixtures of serpentine- and saponite-like phyllosilicates, although their mineralogical characteristics do not fully correspond to well-crystalline terrestrial layered silicates. Here we compare magnesium K-edge X-ray absorption near-edge structure spectra from Ryugu and carbonaceous chondrite matrices with those of magnesium-bearing hydrous silicates. The results indicate that the recorded magnesium coordination environments include a substantial contribution from poorly crystalline magnesium silicate hydrate-like material, in addition to serpentine- or saponite-like components. Integrated analysis of solubility data for magnesium silicate hydrate further suggests that this material exhibits coherent physicochemical behavior across a wide compositional range. Assuming its initial precipitation and subsequent mineralogical transformations, a wide range of compositional variation can be produced without requiring separate aqueous conditions for each local composition. This framework provides a physicochemical basis for explaining the compositional variability and associated phyllosilicate diversity of C-type chondritic matrices.