Geochronology of the Xiaodonggou Porphyry Mo Deposit in Northern Margin of North China Craton
Article first published online: 21 MAY 2010
© 2010 The Authors. Journal compilation © 2010 The Society of Resource Geology
Volume 60, Issue 2, pages 192–202, June 2010
How to Cite
Zeng, Q., Liu, J., Qin, F. and Zhang, Z. (2010), Geochronology of the Xiaodonggou Porphyry Mo Deposit in Northern Margin of North China Craton. Resource Geology, 60: 192–202. doi: 10.1111/j.1751-3928.2010.00125.x
- Issue published online: 21 MAY 2010
- Article first published online: 21 MAY 2010
- Received 26 August 2008. Accepted for publication 18 May 2009.
- northern margin of North China craton;
- Re–Os dating;
- SHRIMP U–Pb dating;
- Xiaodonggou porphyry Mo deposit
The Xiaodonggou porphyry Mo deposit is located in the Mesozoic calc-alkaline Xiaodonggou granitoid within a Palaeozoic fold zone of northern China. The mineralization mainly occurred in an area of 0.54 km2 at the south-eastern part of the Xiaodonggou granitoid. The mineralization includes disseminated molybdenite, pyrite, chalcopyrite, magnetite and pyrrhotite and stockwork quartz-sulfide veins. A molybdenite-rich inner core is surrounded by a concentric zone of the sulfide mineral assemblage of pyrite, galena and sphalerite. Intense potassic alteration is overprinted by sericitization and silicification in the mineralized zone. SHRIMP U-Pb data of zircon indicate that the granitoid crystallized at 142 ± 2 Ma (2σ). Re–Os age dating for six molybdenite samples from underground galleries of the deposit constrains the age of porphyry-style Mo mineralization to be 138.1 ± 2.8 Ma (2σ). These data suggest that porphyry-style mineralization was associated with the Xiaodonggou granitoid intrusion and support an Early Cretaceous porphyry-type metallogenic epoch along the northern margin of North China Craton.