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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (4): 473-480.doi: 10.11872/j.issn.1005-2518.2018.04.473

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Structural Characteristics and Mineralization of Xuejiping Porphyry Copper Deposit in Northwest Yunnan

Xuelong LIU(),Fucheng YANG,Changzhen ZHANG,Ying LUO,Shuaishuai WANG   

  1. 1Facculty of Land and Resource Engineering，Kunming University of Science and Technology，Kunming 650093，Yunnan，China
  • Received:2018-04-26 Revised:2018-07-10 Online:2018-10-10 Published:2018-10-17

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Abstract:

Xuejiping copper deposit is located in the southern part of Yidun-Zhongdian arc belt，which is a typical deposit of porphyry mineralization in the Indosinian period.The ore-control structural characteristics of Xuejiping copper deposit was systematically analyzed，which shown the orebody’s outputting is strictly controlled by the NW-NNW fracture and fold structure and the formation of ore is closely related to the Indosinian tectonic-magmatic activities.The joints （fissure） are more developed and have a lot of pyrite± chalcopyrite+quartz vein filling in ore-bearing porphyry.Metal sulfides such as pyrite and chalcopyrite are mainly filled along the joint （fissure） to form a large number of metal sulfide veins and fine veins，which shown that there is a close relationship between the developmental intensity of pyrite and the development of cracks in the rock mass.In addition，the effective delineation of limestone strata in Xuejiping mine area indicates that intrusive contact between limestone and quartz diorite porphyrite.Coupled with the extensive magmatic hydrothermal activity in the region，it should be believed that the basic conditions of skarn orebody formed，the results and provide a scientific basis for the mineral exploration.

Key words: porphyry copper deposit, structural characteristics, joint（fissure）, mineralization, prospecting direction, Late Triassic, Xuejiping, Northwest Yunnan

CLC Number: 

  • P618.41

Fig.1

Simplified geological map of Xuejiping porphyry copper deposit in Northwest Yunnan"

Fig.2

Geological profile map of No.17 line in Xuejiping copper deposit"

Fig.3

Microscopic characteristics of mineralization in Xuejiping copper ore district"

Fig.4

Characteristics of faults and joint （fissure） in Xuejiping copper deposit"

Table 1

"

点号 产状序号 倾向/(°) 走向/(°) 倾角/(°) 点号 产状序号 倾向/(°) 走向/(°) 倾角/(°)
No.03 ① 20 290 31 No.32 ② 310 40 25
② 65 335 78 ③ 73 343 62
No.09 ① 152 62 70 No.41 ① 122 32 69
② 292 22 72 ② 40 310 42
③ 253 343 80 ③ 132 42 53
No.15 ① 285 15 72 No.155 ① 110 20 85
② 225 315 54 ② 40 310 31
③ 75 345 16 ③ 270 0 35
No.17 ① 142 52 54 ④ 140 50 34
② 310 40 78 G.17 ① 75 345 16
③ 13 283 40 ② 182 272 86
No.18 ① 95 5 78 ③ 237 327 87
② 34 304 71 G.21 ① 326 56 84
③ 278 8 79 ② 65 335 64
No.32 ① 194 284 6

Fig.5

Rose diagram of joints trend in Xuejiping copper deposit"

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