湘中南区棋子桥期岩石地层类型及其穿时性与找矿意义

湘中南区昔日的棋子桥期包含了：（１）茅冲组常滨岸碎屑岩；（２）沙河组近滨台盆泥灰岩相；（３）棋子桥组开阔台地灰岩相；（４）黄公塘组局限台地云岩相４个岩石地层单位类型，笔者研究表明，以上各岩相类型分别与沉各型磷矿、黄铁矿和砂岩铜矿以及层控制铅锌，黄铁矿床密切有关，因而对其进行探讨具有害观找矿指导意义。

Rock-stratigraphic Thpes and Their Diachroneity of Qiziqiao Stage in Central-south Hunan and the Significance for Prospecting Mineral Resources

In central-south Hunan rocks of Qiszqiao stage include four types of rock-stratigraphic units:(1)clastic rocks of offshore bank of Maocong Formation;(2)marl facies of nearshore platform-basin of Shahe For-mationj(3) limestone facies of open n1arine platform of Qiziqiao Formation; and (4) doIonutite facies of restric-ed platfOrm of Huanggongtang Formation. The study shows that the types of facies mentioned aboOve are rela tive cIosely to sedimentary phosphorous depOsit,pyrite deposit, copper deposit of sandstone(cupreous sand-stone)and the strata-bounded deposits of Pb-Zn-pyrite respectlvely, Autbor believes that further research and disc us s ion of roc k-stratigraphic types ha ve the s ignificance in general t o guide the prospicting of minera l re-sources.