A New Example of Unconformity-Related Endogenic Metallization: the Yinan Au-Cu-Fe Deposit in Shandong Province, China

Abstract

Abstract:

The Yinan skarn and hydrothermal type Au-Cu-Fe deposit in Shandong Province occurs in the contact zone of the intermediate-acidic composite intrusions of the Yanshanian age and their surrounding wall rocks. In the recent years, two new ore layers have been discovered on the unconformity surface between the Archean and Neoproterozoic as well as in the overlying Neoproterozoic cover rocks. Locally in the Archean basement rocks below the unconformity, Au and Cu mineralization has also been observed. The unconformity-controlled orebodies are typically layer- or sheet-like and laterally continuous and flat, with a normal depth of 430-650 m beneath the surface. Tectonically as an unstable and weak zone, the unconformity surface and the overlying interfaces between mechanically different strata are ready to be fractured and glided during later tectonic activity and magmatic intrusion, thus resulting in the filling and mineralization of magmas and related hydrothermal fluids. Meanwhile, the unconformity surface is usually served as a geochemical barrier, and the marked difference in chemical composition between the cover rocks （pebbled sandstone, sandstone and shale interbedded with argillaceous limestone） and the basement rocks （granite gneiss and amphibolite） may also have played an important role in the unconformity mineralization. The veinlet and disseminated Au and Cu mineralization in the Archean basement rocks may be related to the extensional cleavages in the basement caused by the detachment of the unconformity surface. The discovery of the unconformity related mineralization in the Yinan deposit is of great significance to the study of metallogenesis and exploration both in the mine and in the entire western Shandong Province.

Key words: Au-Cu-Fe mineralization, skarn deposit, unconformity surface, western Shandong

CLC Number:

P618

GU Xue-xiang, DONG Shu-yi, WANG Yin-hong，HU Gui-Zeng, DU Shu-hao，JIAO Peng. A New Example of Unconformity-Related Endogenic Metallization: the Yinan Au-Cu-Fe Deposit in Shandong Province, China[J]. Geoscience, 2008, 22(2): 151-161.

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