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LU Feifan,TAN Xiucheng,ZHONG Yuan,LUO Bing,ZHANG Benjian,ZHANG Ya,LI Minglong,XIAO Di,WANG Xiaofang,ZENG Wei
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Fig. 5. Exposed surface and stratigraphic overlap in the Qixia Formation of northwestern Sichuan Basin.
(a) Hejialiang section, upper part of Qi-1 Member, characteristics of high-frequency exposed surface in eogenetic Qixia Formation; (b) Hejialiang section, upper part of Qi-1 Member, characteristics of overlap above the exposed surface; (c) Hejialiang section, upper part of Qi-1 Member, photo of the weathered crust, with nearly in-situ breccia resulted from bedrock cutting by karrens; (d) Hejialiang section, upper part of Qi-1 Member, microscopic characteristics of breccia zone in the semi-weathering layer in Fig. 5c (PPL); (e) Hejialiang section, upper part of Qi-1 Member, microscopic characteristics of bedrock zone in Fig. 5c, with dissolution pores partially filled with dolomitic vadose silt (PPL); (f) Chejiaba section, Qi-2 Member, dolomitic limestone with dissolution patches and karrens, and brecciation caused by cutting of dominant karst channels, the dolomite is brown, and the limestone is light greyish white; (g) Well D2, 2429.61 m, Qi-2 Member, patchy dolomite, brecciation caused by cutting of dominant karst channels; (h) Well D6, 7743.53 m, Qi-1 Member, sack-like dissolution cave filled by dolomitic silt and insoluble materials (PPL).
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