Formation mechanism of breccia pipe type in Yixingzhai gold deposit

Abstract

Based on the basic geological features of Yixingzhai gold deposit, the geological features, classification and relation to mineralization of breccia pipes were discussed by surveying the xenoliths and breccia’s mineral composition, structure and construction, typical mineralization alteration phenomenon on field and microscopic anatomy in breccia pipes. And the ore-controlling mechanism and the formation mechanism of the blasting breccia pipes were investigated. The main conclusion shows that Hewan and Nanmenshan breccia pipes nearby the NW-striking deep fault are shaped earlier, belonging to the acidic siliceous ingredient production of ultra-hypabyssal magmatic in the late magma stage; Tietangdong and Nanmenshan breccia pipes that are shaped latter are the ultra-hypabyssal auriferous fluid production composed mainly of the skarn in the hydrothermal stage after the magma period. Both root in the unified deep magmatic chamber, belonging to differentiation derivatives at different stages in the deep magmatic chamber.

Keywords

formation mechanism / Yixingzhai gold deposit / auriferous quartz veins / breccia pipes

References

[1] JingS.-hui.. The minerogenetic conditions of Yixingzhai gold deposit, Fanshi, Shanxi[J]. Shanxi Geology, 1992, 7(1): 51-64

[2] LiuS.-w., LiangH.-h., ZhaoG.-c., HuaY.-g., JianA.-hua.. Brian complex isotopic chronology and geological events of precar in Taihangshan region[J]. Science in China: D, 2000, 43(4): 386-393

[3] WangK.-y., LiJ.-l., HaoJ., LiJ.-h., ZhouS.-ping.. The Wutaishan orogenic belt within the Shanxi Province, northern China: A record of late Archaean collision tectonics[J]. Precambrian Research, 1996, 78: 95-103

[4] LiuS.-w., PanY.-m., XieQ.-l., ZhangJ., LiQ.-gen.. Archean geodynamics in the central zone, north China craton: Constraints from geochemistry of two contrasting series of granitoids in the Fuping and Wutai complexes[J]. Precambrian Research, 2001, 10(1): 45-73

[5] LuoH., ChenZ.-h., ShenB.-feng.. The characteristics and origin of ore-forming fluid of Archean BIF-hosted gold deposits in Wutai Mountain area, Shanxi Province[J]. Progress in Precambrian Research, 2000, 23(2): 65-75

[6] LI Zhao-long, ZHANG Lian-ying, LUO Hua-bao. Isotope geochemistry of volcanic Au-Ag deposits in north Shanxi province[J]. Acta Geoscientia Sinica, 1994(1/2): 145–15. (in Chinese).

[7] LiS.-b., LiJ.-jian.. A study of metallogeo-geochemical characteristics of the vein gold ore field in Yixingzhai, Hengshan, Shanxi[J]. Progress in Precambrian Research, 1997, 20(2): 1-20

[8] YeR., ZhaoL.-s., ShenY.-li.. Geochemistry features of Yixingzhai gold deposit in Shanxi Province[J]. Geoscience, 1999, 13(4): 415-418

[9] KrönerA., WildeS. A., ZhaoG. C., O’BrienP. J., SunM., LiuD. Y., WanY. S., LiuS. W., GuoJ. H.. Zircon geochronology and metamorphic evolution of mafic dykes in the Hengshan Complex of northern China: Evidence for late Palaeoproterozoic extension and subsequent high-pressure metamorphism in the North China Craton[J]. Precambrian Research, 2006, 146(1/2): 45-67

[10] WildeS., CawoodP., WangKy.. The relationship and timing of granitoid evolution with respect to felsic volcanism in the Wutai complex, North China craton[C]. Proc 30th Int’l Geol Congr, 1997, 17(1): 75-87

[11] YeR., ZhaoL.-s., ZhenY.-li.. Study on geological geochemical dynamics of ore-formation of Yixingzhai gold deposit[J]. Geoscience, 1997, 11(1): 58-65

[12] WeiJ.-h., TanW.-j., GuoD.-zhao.. Isotope systematics and metallogenetic age of Zhuanghe gold deposit, Liaoning province, China[J]. Joural of Central South University of Technology, 2007, 14(1): 104-110

[13] LiuL.-m., PengS.-l., YangQ.-zhou.. Source and location mechanism for lode gold deposits hosted in metamorphic rocks in northeastern Hunan, China[J]. Journal of Central South University of Technology, 2001, 8(2): 108-113