| 1 | 山西省五台山—恒山地区脉状金矿成矿的地球动力学显示文摘Veined gold deposit is product of crustal evolution in special space and special time.It has close relations between the product of veined gold deposit and the formation mechanism (process of mineralization geodynamics),It has special geological significance in the aspect of source of metallogenic material and metallogenic fluid,migration and precipitation, especially in vein gold deposit of structure boundary.This pater discusses four aspects,i.e. The geodynamic background,source of metallogenic fluid,fluid migration mechanism and structural position of deposits.The concluding remarks are given as follows. 1\ The Pre Cambrian metamorphic complexes emerged extensively in the Wutaishan Hengshan area, more than 60% of those are granitic rock, as the oldest continential crust of crystalline basement they all have the characteristics of deformation and gneiss, and many of them were formed in 2500~2700 Ma, in them some high rank deformed super crust inclusions, or relicts of different rock facies showing 2800~2900 Ma or earlier ages. Through the comphrehensive analysis of large rock chemical data on the relevant diagram about their characteristics, it reflects that not only the granitic rock has two different characteristics of rock series and regionalization but also shows several distinct source tendencies. Itsuggests that the large emergence of granitic rock in Archean era in the area is related to certain collision mechanism, thus resulted in the connection of the landmass, north to Hengshan and the landmass of Bupin,and so completed the cratonization of North China platform. The formation of granitic rock in early Proterozoic era is relevant to rifting which belongs to the genetic series of later orogenic to postorogenic period. 2\ The zonal super crust rock series that stretches in NEE direction on the Archaeozoic crystalline basement in Wutaishan and its vicinity area is called Wutai Group and Hutuo Group. The Wutai Group is mainly consisted of mafic volcanic rock, and uncomformably was under laid the Hutuo Group of thick littoral shallow sea facies deposit. They formed at 2600~2000 Ma and underwent two foldings, riftings, metamorphisms and granitic intrusions, So it has the complicated inner structure. The analysis of geometry and dynamics shows that they were formed under NW SE horizontal compression. The characteristics of rock,stratum, metamorphism and deformation show that the geodynamics pattern fo the orogenic belt belongs to inner sialic orogenic process and it can be divided into 5 devloping stages:① basin riftings stage(2500~2600 Ma);② basin spreading stage(2500 Ma±);③ local rift stage(2400 Ma±);④ rift southern migration stage(2000~2400 Ma)⑤ under crust detachment stage(1800~2000 Ma). 3\ The formation and migration of metallogenic fluid is the important part of the metallogenic geodynamics process. In the area of Wutaishan and Hengshan the formation and migration process of vein gold deposit metallogenic fluid underwent two tectonic systems early Per Cambrian collision orogenics period or interior sialic orogenics and Mesozoic intracontinental orogenics in the light of the character of typical gold deposit fluid inclusion, gas liquid composition, hydroxide isotopic component and their formation conditions of physics and chemistry. The formation and migration of metallogenic fluid is not only controlled by genetic mechanism of vein gold deposit but also correlated with the formation tectonic background of gold deposit.So the greenstone type vein gold deposit is mainly primary fluid, but the epigenetic hydrothermal vein gold deposit is the secondary fluid. The surface water distinctly takes part in the mineralization, but its migration mechanism is another different type of tectonic deformations. 4 Greenstone type gold deposit and epigenetic hydrothermal vein gold deposit are the most important vein gold deposits of Wutaishan area. Basin on the study of the source bed (rock) and S, Pb isotopic compositions, their metallogenic material sources show that the greenstone vein gold | 田永清 王安建 余克忍 许文良 | 1998 | 华北地质矿产杂志1998，13，4： | 14 |
| 2 | 紧闭褶皱翼部的剪切变形作用——五台山绿岩带金矿化的一种构造控矿机制显示文摘五台山绿岩带中 ,与变质火山 沉积岩系直接相关的金矿化分布广泛 ,具有多种成矿和控矿机制。但就两种主要类型金矿———剪切带型金矿和铁建造型金矿的时空分布、地质特征和赋存的构造部位来看 ,它们都明显地与剪切变形 (韧性的或脆性的 )所产生的构造 热液活化作用有关 ,具显著的构造控矿意义。区域构造分析表明 ,五台山绿岩带的构造格架是一个多级和多期褶皱与断裂的组合 ,总的构造样式是一个紧闭程度向中心增强的复式倒转向形。它们是在北西 南东向挤压作用下递进变形的结果。在这一区域应力场作用下 ,处于不同构造部位的岩石发生变形分解作用 ,从而在紧闭褶皱的翼部产生一系列剪切变形带 ,构成了五台山绿岩带构造控矿机制。本文将以两类绿岩金矿的典型矿床为例 ,对这一控矿构造机制进行全面分析。 | 田永清 苗培森 余克忍 | 1999 | 前寒武纪研究进展1999，22，4： | 5 |
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