2024
DOI: 10.3190/jgeosci.388
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The 2Q-(Or + Ab)-4An (QUORAA) diagram: poor for classification but good at deciphering the evolution of granitoids

M.-M. Sun,
Y. Wang

Abstract: The 2Q-(Or + Ab)-4An (QUORAA) diagram (Enrique 2018) is proposed as an approximation of the modal QAP naming scheme for silica-saturated plutonic rocks. However, whether this scheme can reasonably reproduce the modal QAP classification results still needs to be tested. Through the inspection based on a dataset of 955 pairs of the mineral mode and whole-rock chemical compositions from the literature, it was found that the ratio of consistency between the two schemes is only 63.56 %. The consistency ratio is hig… Show more

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