中国东部原生金刚石矿床成因与找矿

中国的原生金刚石矿床首先发现于山东省和辽宁省,它是规模不大而稀少的矿床类型。中国原生金刚石矿床只产于地台区,沿着郯庐断裂分布,主要矿田呈北北东—南南西向有规律的排列。金伯利岩是一种复式的混杂岩,它侵入的地区伴随有地幔的隆起或穹隆构造。侵入作用是多次的,来自深部喷发作用的金伯利岩是极少。金刚石是从岩浆中结晶沉淀的。“兰地”,“黄地”等风化产物,地球化学、磁异常、重矿物源等有助于指导找矿。

GENESIS AND PROSPECTING OF PRIMARY DIAMOND DEPOSITS IN EASTERN CHINA

Primary mineral deposits of diamond were first found in Shandong and Liaoning provinces.It has been regarded as a volumetrically insignificant and very rare types of mineral deposits. Primary mineral deposits of diamond are confined to the platform in China. The deposits are outcroped along the Tanlu fracture system.Main mineral deposits are aligned along a major NNE-SSW tending fracture system.Kimbelite is a petrographically complex hybrid.The kimberlites intruded into areas that may be associated with local swell or dome struture of mantle.There are three period kimberlite in East China. Extrusive kimberlites are extremely rare.It is believed that these rocks are intruded from great depth. Diamond is precipitated from the kimberlite magma. "Blue-groud", "Yellow-ground"and mineralogical anomalies,geochemical,magnetic signature and placer mineral sourece may be an indicater of kimberlites.