Q1: In many articles on jadeite and jadeitite(Shi 2008,CÁRDENAS-PÁRRAGA2021, Meng 2016, Abduriyim2017, et al.), scholars draw spider diagram based on trace element data and REE from LA-CIP-MS. But the number of elements in the horizontal coordinate is often different. What is the principle on which this is selected?
Q2： When some of the results of the test are below the detection limit（bdl) , or the corresponding elements are not detected (nd), how should they be reflected in the diagram?
Trace element abundance plots (spidergrams) are used to illustrate the rare earth element or mantle incompatible trace element contents of a sample. The order of trace elements is usually shown in the order of decreasing ionic radii. In the case of the REE, where the lighter elements such as La have the larger ionic radii (due to the lanthanide contraction with higher atomic numbers), the LREE are shown on the left and the HREE on the right part of the spidergram. Elements concentrations below detection limit cannot be plotted. The computer program plotting the spidergram usually interpolates their values between its neighboring elements.
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