On Metallogenic Conditions and Regularities of the Lower and Middle Reaches of the Changjiang River

The paper deals with the metallogenic conditions and regularities of the region ol the lower-middle reachesof the Changjiang River in China. The complicated structural network with the Changjiang (Yangtse) deepfracture as its trunk is the leading rock-and ore-controlling structure of the metallogenic belt. Thehigh-potassium granodiorites of the first magmatic sequence of the Mesozoic Yangtse syntexis type and thesodium-rich diorites of the second sequence are genetically related to the copper ore series and the iron ore se-ries respectively. and occur respectively in the block-faulted and-folded uplift area and the down-faulted vol-canic basin as well as the transitional zone between the two. The ore-hosting horizons show specific associa-tions of rocks and often contain ore beds basically of stratabound nature.

On Metallogenic Conditions and Regularities of the Lower and Middle Reaches of the Changjiang River

Abstract The paper deals with the metallogenic conditions and regularities of the region of the lower-middle reaches of the Changjiang River in China. The complicated structural network with the Changjiang (Yangtse) deep fracture as its trunk is the leading rock- and ore- controlling structure of the metallogenic belt. The high-potassium granodiorites of the first magmatic sequence of the Mesozoic Yangtse syntexis type and the sodium-rich diorites of the second sequence are genetically related to the copper ore series and the iron ore series respectively, and occur respectively in the block-faulted and -folded uplift area and the down-faulted volcanic basin as well as the transitional zone between the two. The ore-hosting horizons show specific associations of rocks and often contain ore beds basically of stratabound nature.