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Fig. 6 | Journal of Palaeogeography

Fig. 6

From: Palaeoenvironmental setting of lacustrine stromatolites in the Miocene Wudaoliang Group, northern Tibetan Plateau

Fig. 6

Bimodal distribution pattern of the relative abundance of normal alkane detected in the stromatolite samples ranging from the mid-chain n-alkanes (C19 to C24) to the long-chain n-alkanes (C25 to C35). Note the predominance of odd-numbered n-alkanes over even-numbered n-alkanes in their relative abundance range in the range of C25-C33. Long-chain odd-numbered n-alkanes (C25, C27, C29, C31) could indicate the presence of higher plants in the vicinity of the depositional environment. See further explanation from the calculated index results in Table 7

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