Geochemical characteristics and protoliths of the marble rock group of the khondalite series in the Daqing Mountains, Inner Mongolia;

Existing in the Cambrian silicalite formation composed of black shert and slate,the gold deposits are so clearly controlled by strata,host rock types and structures that their stratabound character is agreed by many geologists.

As a sediment formation, silicalite formation with a large sedimentary thickness is consist of siliceous rocks (cherts), mud stone/shale or callys, carbonatite and siltstone, and is charactered by enrichment in organic and bacterium-alga microbe.

The whole area of the county belonged to goldbearing greenstone formation in late archean era and turbidite formation in proterozoic era with granite of gold-copper series of Yanshan Period widely cropped.

癤uanlong Style” ironstone formation is an Early middle proterozoic reniform ironstone and oolitic ironstone formation which is one of the earliest ironstone discovered on the earth.