《The Effects of Applying the Association of Al》.pdfVIP

Journal of China University of Geosciences, Vol. 18, No. 4, p.299–309, December 2007 ISSN 1002-0705 Printed in China The Effects of Applying the Association of Al, K, and Sn in Stream Sediments for Gold Exploration in Different Landscapes He Jinzhong* (何进忠) Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China; The Geological Surveying Institute of Gansu Province, Lanzhou 730000, China Yao Shuzhen (姚书振) Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China ABSTRACT: Geochemical data of altered wall rocks are important for the metallogenic prognosis of hydrothermal gold deposits. Indicator elements of altered wall rocks such as K, Al, As, Sb, and Hg have been successfully used to assess gold anomalies in lithogeochemical survey. However, such researches have rarely been done in stream sediment survey for the exploration of gold from various landscapes. On the basis of the geochemical analysis of altered wall rocks of gold deposits in the cold desert areas of Gansu (甘肃) Province in Northwest China, it is found that the combination of Al, K, and Sn could serve as an important indicator of hydrothermal gold deposits and can be used to evaluate the metallogenic prospective of gold anomalies in stream sediments. More studies performed in the cold grassland areas and the moderate-low relief mountainous areas showed that, both weak and strong geochemical anomalies can be extracted, if strictly abiding by the ways of calculation an