贵州万山汞矿田熬溪组风暴沉积作用特征及地质意义

Characteristics and Geological Significance of Tempestite of Ao′xi Formation,Wanshan Mercury Orefield,Guizhou Province

首次报道了万山汞矿田熬溪组典型的白云质风暴岩。通过详细的野外观察，识别出多种典型的风暴沉积构造：底面构造、丘状一洼状交错层理、块状层理、放射状组构、平行层理及变形层理等。依据最新风暴岩沉积序列划分方案，划分出3种风暴沉积序列类型。区域古地磁资料表明，研究区在寒武纪处于赤道附近低纬度（11°～16°）浅海风暴作用易发区。最后提出，研究区寒武纪风暴岩频发可能与区内大规模汞一铅一锌成矿存在联系。

Cambrian tempestite deposits are well preserved in western Hunan and eastern Guizhou. We re- port for the first time a typical dolomitic tempestite from the Ao＇xi Formation in the Wanshan mercury ore- field. Various typical depositional structures of tempestite are identified by field observations, such as scouring-filling structures, hummocky and sunken cross stratifications, massive bedding, radial fabrics, graded bedding and convolute bedding. According to the most updated classification of tempestite deposi- tional sequences, three types of sequences have been recognized. According to regional paleomagnetic da- ta, the study area was located in low latitude （11°-16°） zone where storm deposits are prone to develop. Therefore we propose that the abundant tempestite deposits in the Cambrian of the Yangtze craton may be associated with large-scale mercury-lead-zinc regional mineralization.