@article{8743466,
  abstract     = {{Reliable identification of chondrules, calcium-aluminum-rich inclusions (CAIs), carbonate grains, and Ca-phosphate grains at depth within untouched, unprepared chondritic samples by a nondestructive analytical method, such as synchrotron X-ray fluorescence (SXRF) computed tomography (CT), is an essential first step before intrusive analytical and sample preparation methods are performed. The detection of a local Ca-enrichment could indicate the presence of such a component, all of which contain Ca as major element and/or Ca-bearing minerals, allowing it to be precisely located at depth within a sample. However, the depth limitation from which Ca-K fluorescence can travel through a chondrite sample (e.g., similar to 115 mu m through material of 1.5 g cm(-3)) to XRF detectors leaves many Ca-bearing components undetected at deeper depths. In comparison, Sr-K lines travel much greater distances (similar to 1700 mu m) through the same sample density and are, thus, detected from much greater depths. Here, we demonstrate a clear, positive, and preferential correlation between Ca and Sr and conclude that Sr-detection can be used as proxy for the presence of Ca (and, thus, Ca-bearing components) throughout mm-sized samples of carbonaceous chondritic material. This has valuable implications, especially for sample return missions from carbonaceous C-type asteroids, such as Ryugu or Bennu. Reliable localization, identification, and targeted analysis by SXRF of Ca-bearing chondrules, CAIs, and carbonates at depth within untouched, unprepared samples in the initial stages of a multianalysis investigation insures the valuable information they hold of pre- and post-accretion processes in the early solar system is neither corrupted nor destroyed in subsequent processing and analyses.}},
  author       = {{Tkalcec, B. J. and Tack, Pieter and De Pauw, Ella and Vekemans, Bart and Nakamura, T. and Garrevoet, J. and Falkenberg, G. and Vincze, Laszlo and Brenker, F. E.}},
  issn         = {{1086-9379}},
  journal      = {{METEORITICS & PLANETARY SCIENCE}},
  keywords     = {{Space and Planetary Science,Geophysics,CM CHONDRITES,CI CHONDRITES,TRACE-ELEMENT,CARBONATES,SULFATE,MINERALOGY,MURCHISON,STRONTIUM}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{817--829}},
  title        = {{Sr distribution as proxy for Ca distribution at depth in SXRF analysis of mm‐sized carbonaceous chondrites : implications for asteroid sample return missions}},
  url          = {{http://doi.org/10.1111/maps.13797}},
  volume       = {{57}},
  year         = {{2022}},
}

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