KLPGChristian Movement for the Liberation of Guadeloupe
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The contents of major elements (Al, Ca, Si, and Fe) and rare earth elements (REEs) for the concretions and rock samples were obtained by X-ray fluorescence spectrometry (XRF; PW2404, Philips Electronics) and high-resolution inductively coupled plasma mass spectrometry (ICP-MS; Element I, Finnigan MAT) at the Key Laboratory of Petroleum Geochemistry (KLPG) at the China National Petroleum Corporation.