摘要
养麦冲金矿位于湖北随州南东秦岭造山带南缘。该区剪切带较发育，剪切带走向２９０°－３２０°，倾向南西，长５０ｋｍ，宽１００－１５００ｍ，并具有Ｓ－Ｃ组构，ａ型褶皱，剪切褶皱糜棱岩，型构造等。据构造特征可确定两种剪切带类型：１．早期韧性剪切带，该类剪切带为ＮＷ向，为右行运动，表现为顺层剪切，常出现于先存构造面或岩系与岩性界面附近。这类剪切带常为多层次韧性滑脱面。２．中、晚期韧一脆性和脆性剪切带。这类剪切带以线性剪切形式产出，ＮＷ向，斜冲性质，属左行运动样式。金矿床伴有Ａｓ、Ｈｇ异常，与剪切带有明显关系。成矿作用是从韧脆性阶段至脆性阶段。
Qiaomaichong gold deposits are located in Southern margin of east Qinling orogenicbelt in Southern Sceizhou city of Hubei Province. There, the shear zones are very developed.That show strike with a range of 290-320°, dipping SW and spreads in the area with length of 50km and width of 100-1500m. There exist following features in shear zone: S-C foliationstructure, a typed folds, shearing fold, mylonites, and other typical structure et al.Based on the tectonic characteristies it could be grouped into two type of shear zones:1. early ductile shearing zonesThis kind of shearing zone spreads in the orientation of NW with dextral moving sense,represented by bedding shearing zone and occurred along the existed tectonic plane or boundaryiesbetween rock series or lithological units. These shearing zones resulted from maltiple ductiledecollements.2. Mid-late ductile-brittle and brittle shear zonesThis kind of zone is represented by tinea shearing zone which shows the NW trendingshearing zones are obique thrusts with sinistral movement.gold ores depoSits are closely relative to shearing zones in which the As and Hg anomalies arewidely spread. Metallogenesis is mainly occurs in the range from ductile-brittle stage to brittlestage.
出处
《前寒武纪研究进展》
1997年第1期27-34,共8页
Progress in Precambrian Research
