Fig. 3. XRF scanning results of core samples in Madong area. (a) At 3877.13 m in Well Ma 201, basalt, Ti content distribution, bright Ti-rich strips are dislocated, see the photo of the corresponding rock sample in Fig. 2b; (b) at 3877.13 m in Well Ma 201, Ca content distribution, Ca is rich in fractures and pores; (c) at 3877.13 m in Well Ma 201, Mn content distribution, Mn is rich in fractures; (d) at 4678.90 m in Well Madong 3, photo of basalt sample; (e) at 4678.90 m in Well Madong 3, Ca content distribution, Ca is rich in fractures and pores; (f) at 4678.90 m in Well Madong 3, Mn content distribution, the distribution of Mn is irregular and the fracture edge is relatively rich in Mn; (g) at 4634.70 m in Well Madong 3, photo of andesite sample; (h) at 4634.70 m in Well Madong 3, Ca content distribution, Ca is rich locally in fractures; (i) at 4634.70 m in Well Madong 3, Mn content distribution, the distribution of Mn is limited in the fractures; (j) at 5334.10 m in Well Xiayan 2, photo of basalt sample, the sampling location is shown in Fig. 2d; (k) at 5334.10 m in Well Xiayan 2, Ca content distribution, Ca is rich in fractures; (l) at 5334.10 m in Well Xiayan 2, Mn content distribution, Mn is rich in lower part of horizontal fractures.
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