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The shale portion of Chang 7 member (C7M) can be divided into two sub-members (SM): the Chang 7-2 sub-member (C7-2SM) and Chang 7-3 sub-member (C7-3SM). An analysis of trace elements shows that C7M shale developed under a freshwater sedimentary environment. C7-3SM shale was formed under conditions of comparatively higher salinity and a much deeper waterbody than C7-2SM shale.C7-3SM shale exhibits...
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