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介绍了西秦岭北缘断裂带东段和海原断裂带西段的天然断层泥的分形方法和结果，并对断层泥的粒度分布特征与断层运动特性的关系进行了探讨。 相似文献
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本文以焦家断裂带深部上盘发现金矿体的地质事实为依据，将焦家断裂在成矿后对矿体的破坏作用作为讨论重点，根据现今焦家断裂上、下盘金矿体以断层泥为界，有被错断的明显特征，指出发育在焦家断裂主断裂面中的断层泥为成矿后断裂活动的产物。依据上、下盘金矿在矿石类型、围岩蚀变、矿石矿物、成矿阶段等方面具有极为相似一致特征，提出在117.69~121 Ma成矿期，焦家断裂带中的上、下盘蚀变岩型金矿统一形成于深度3~9 km之间成矿期的焦家断裂带中，二者在成矿时具有时、空上的完全统一性。受焦家断裂总体正断层效应影响，现今焦家断裂深部新发现的上盘金矿（化）体应为下盘金矿（化）体被错断的部分。 相似文献
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Fluid flow in fractures and host rocks has been investigated in shallow buried Miocene alluvial fan deposits. A structural, petrographical (optical, CL, SE microscopes and XRD) and geochemical (microprobe and δ18O-δ13C stable isotopes) study has been performed in normal faults affecting Serravalian-Tortonian siliciclastic rocks of the Vallès-Penedès basin. These faults formed during the development of the Vallès-Penedès fault-related syncline, which caused the rotation of the earliest fractures. Faulting occurred continuously before, during and after host rock cementation. Rocks affected by faulting are represented by clay-rich gouges, which formed thanks to the high phyllite clast content within the otherwise clean and mature sandstones and conglomerates. Despite the low permeability of these rocks, cross-fault and fault-parallel fluid flows occurred in most of the faults.Host rocks and veins were cemented by two generations of calcite, i.e. Cc1 and Cc2. Cc1 precipitated from meteoric waters at shallow burial conditions whereas Cc2 precipitated from meteoric waters in a confined aquifer.Palygorskite has been identified in shear zones within the gouges indicating their later formation by interaction of Mg-rich fluids with previous smectites. These fluids probably derived from Miocene seawater expelled from the underlying Transitional–Marine Complex “TMC” by compaction.Sedimentation, fracturing and cementation occurred in a very short lapse time of about 6–7 Ma, between the Serravalian-Tortonian age of the sediments and the end of the extensional tectonics in the Vallès-Penedès fault (Pliocene). 相似文献
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本文以焦家断裂带深部上盘发现金矿体的地质事实为依据,将焦家断裂在成矿后对矿体的破坏作用作为讨论重点,根据现今焦家断裂上、下盘金矿体以断层泥为界,有被错断的明显特征,指出发育在焦家断裂主断裂面中的断层泥为成矿后断裂活动的产物.依据上、下盘金矿在矿石类型、围岩蚀变、矿石矿物、成矿阶段等方面具有极为相似一致特征,提出在117... 相似文献
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