【摘要】 野外和室内研究表明,凤太矿田古道盆古道岭组岩层沉积结束后,曾出露水面,致使该组顶部出现不规则古剥蚀面和喀斯特地貌,为相继沉淀的矿石提供了堆积的场所。随后,由于北东向同沉积构造的反复活动,将该区分割成一系列的凹槽,同沉积构造的活动驱动深部流体上升,形成海底喷流铅锌矿床。更多还原

【Abstract】 The strata-bound Pb-Zn ore deposits in Feng-Tai ore field are localized within graben basin of Yantze platform edge. These strata in the ore field composed of the Middle Devonian Gudaoling and Xinghongpu Formations. After sedimentation of the Gudaoling Formation the horizon was exposed out of the sea surface forming a very irregular fossil erosion surface and karst landform at the top of the Gudaoling Formation providing an accumulational place with the sedimentary deposit successively. Afterwards, due to repeated movements of the syndepositional northeast-trending fault system this area was cut into a series of troughs. The deep-seated fluid from faults was driven up by the syndepositional structural movements, which occurred forming exhalation in the proximate sea bottom. The mineralizing exhaled solutions rich in Zn, Si, Fe, Pb ascened and overflowed along the syndepositional northeast-trending faults, then the solutions mixed with the oxygen-lacking saline solution in this submarine depressions. Within the pool environment of the thoughs large amount of metal-sulfides, silica, ferroan carbonate deposited depending on the variable physicochemical conditions, and formed the stratiform, pseudo-stratiform, lenticular lead-zinc ore bodies and metalliferous formation. At the same time this exhalation produced the syndepositional breccia and brecciated ore near the syndepositional structures.The petrology and petrochemical character of the metalliferous formations Pb/Zn ratios of the ore bodies and characteristics of the trace-element contents, the sulfur, lead isotopes have provided convincing evidences for the mechanizm of this exhalation sedimentary deposit.更多还原