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JiaoJia fault gouge, Jiaodong, Shandong, China

 

megacryst

Roberto Weinberg, Monash University, Australia

 

 

 

 

Jiao Jia Fault Gouge
mingled contact

Figure 1a) Mines along the Jiao Jia Fault. This fault is tens of kilometres long, and it has been recorded from close to the surface to depths of 1500m in the mines. Gold deposition was typically in the footwall of this fault which separates the Cretaceous Linglong intrusion and the Archean-Paleoproterozoic sequence on the hanging wall. The fault zone is marked by a well-defined fault gouge which are documented here. The ones with a blue rectangle are reported here and cover a map distance of 7km.

Jiao Jia Mine, Level 390m, (dip direction/dip) 305-330/26.

Summary. The ore is a breccia in which there a sections that are foliated. In one section there is a breccia with angular feldspar clasts with sulfide-filled fractures in a matrix that is foliated suggeting a ductilely deformed breccia (probably due to alteration weakening)_.
Jiao Jia mine
Figure 1a) Level 390m. Two fault gouges spaced by 50cm. Both are made of dark grey clay, and about 10cm wide.
Jiao Jia mine
Figure 1b) Two fault gouges spaced by 50cm. There is 3m wide gold mineralization immediately in the footwall.
Jiao Jia mine
Figure 1c) Two fault gouges spaced by 50cm.
Jiao Jia mine
Figure 1d) Fault gouge.
Jiao Jia S-C fabric
Figure 1e) S-C fabric in fault gouge showing normal movement.
Jiao Jia gouge sample
Figure 1f) Sample of folded fault gouge, JiaoJia mine Level 390, sample JJ15D08B1


Matang Mine, Level 500m, fault gouge dip direction/dip 310/30, lineation 340
Matang Mine
Figure 2a) Fault gouge.
Matang Mine
Figure 2b) Fault gouge.
Matang Mine
Figure 2c) Fault gouge.

Sizhuang mine.

Visited two levels: Level 445 Line 264, dip direction/dip = 275-280/30, L towards 300-305, 288/33 L 175/15 and 331/31.

Sizhuang Mine
Figure 3a) Fault gouge .
Sizhuang Mine
Figure 3b) Fault gouge more than 20 cm thick overlain by broken up red granite.
Sizhuang Mine
Figure 3c) Fault gouge (strike/dip = N18E/33W) pen parallel to lineation 175/15 and 331/31.
Sizhuang Mine
Figure 3d) Fault gouge (strike/dip = N18E/33W) pen parallel to lineation 175/15 and 331/31.
Sizhuang Mine
Figure 3e) Fault gouge (strike/dip = N05-10E/30W) lineation towards 300-305.
Sizhuang Mine
Figure 3f) Fault gouge (strike/dip = N18E/33W).


Sizhuang mine Level 220 line 302

Fault gouge is nearly 30 cm thick with three layers a top orange and clast rich gouge, a middle dark grey layer, very fine clay, and a bottom layer that is light grey. Top plane: 314/30 lineation: 257/27,360/29 (orange fault gauge) Bottom plane: 282/37 lineation: 195/27, 175/5 (white fault gauge).
Sizhuang Mine
Figure 3g) Fault gouge 30 cm thick with a top orange and clast rich gouge, a middle dark grey layer, very fine clay, and a bottom layer that is light grey.
Sizhuang Mine
Figure 3h) Detail.

 


Xincheng gold mine, Level 775m deepest level in the mine, (dip direction/dip) 324/40, 330/31 and L towards 225
Xincheng Mine
Figure 4a) Looking N on fault gouge.
Xincheng Mine
Figure 4b) Fault gouge.
Xincheng Mine
Figure 4c) Fault gouge.