冀东地区长城系高于庄组岩相古地理及黄铁矿生物成因探讨

冀东地区中元古界长城系高于庄组可划分为７个自然岩性段，硫等赋矿层位为其２～５段，由含锰页岩 含锰白云岩 含锰页岩 含锰白云岩组成二个正旋回。高于庄组沉积早期（即下旋回第２段），在遵化 北汤道河水下高地的阻隔下，形成了蓟县 迁西泻湖，属封闭的还原环境，控制了“蓟县式”锰方硼石矿床。高于庄组沉积晚期（即上旋回第４段和第５段）沉积时期，高板河泻湖形成，由于泻湖南侧受北东东向同生断裂控制，北侧又受生物礁制约，在生物作用及滞流的还原环境下，形成了“高板河式”黄铁（铅锌）矿床。上旋回生物礁相和泻湖相区是寻找黄铁（铅锌）矿的靶区。

ON BIO ORIGINATION OF PYRITE MINERAL WITH REFERENCE TO THE LITHOFACIES PALEOGEOGRAPHY OF EAST HEBEI IN A PERIOD OF CHANGCHENG SYSTEM GAOYUZHUANG FORMATION DEPOSITION

The meddle Proterozoic Changcheng system Gaoyuzhuang formation in East Hebei may be distinguished naturally into seven lithologic members of which the second to fifth member is a host of pyrite minerals. Experiencing through two positive sedimentary cycles, each manganous shale to manganous dolomite, the formation deposited at the beginning(the second member of the lower cycle) in the Jixuan-Qianxi lagoon, a reduced environment that was restricted by the Zenhua-Beitangdaohe submerged high, promoting the development of the Jixuan-type manganous boracite deposit. By the late time(the forth and fifth members of the upper cycle), it entered the shaping of the Gaobanhe lagoon which, defined to the south by a contemporaneous fault and to the north by a stretch of bioherm, provided conditions featuring poor circulation and microorganic blooming, ideal enough to develop the Gaobanhe-type pyrite (lead, zinc) deposit. The bioherm and lagoon facies are known a working target in a bid to hunt deposits of its kind.