The Key Lab. of Continental Dynamics, Northwest University, Ministry of Education, Xi ' an 710069, China;
Department of Geology, Northwest University, Xi 'an 710069, China;
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
Department of Geology, Peking University, Beijing 100871, China;
gold; arsenic; element geochemistry; Carlin- type gold deposit; Qinling region;