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Araschnia doris
yes that's mine ;-)
i agree with doris, as u said it could be a seasonal variation.
It is definitely an Araschnia sp., and I think it might be Araschnia doris. But it need verification since Araschnia is an extremely variable genus. My own Map butterfly from Switzerland, Araschnia levana, has even 2 completely different forms (spring and summer forms). There is not much info about Chinese Araschnia sp. around.