关于华北陆块北缘太古宙地质的思考

本文从地层、高级区、变质深成侵入体、变形与变质、成矿作用５个方面进行了思考,提出：华北陆块北缘太古宙地层是有序的,其层序基本符合绿岩带的层序特征;高级区不存在,高级区是变质程度较高的绿岩带;变质深成侵入体岩石类型复杂,现有的岩石分类与表示方法尚不能与实际相对应;变形与变质是有一定规律的,变形遵循压扁变形、伸展变形与挤压变形的顺序,相伴产生变质,表现出完整的变形—变质旋回;一定的矿化与一定的岩石组合有联系,根据绿岩类型及其发育程度可以预测可能发现那些矿床。这些认识之间许多是彼此有紧密联系的,相勘校,互佐证,籍以反映太古宙地质的客观规律性。

ON THE ARCHEAN GEOLOGY OF THE NORTHERN EDGE OF NORTH CHINA LANDMASS

Through the studies on the Archea geology of the northern edge of North China Landmass,the author concluded the following 5 points: 1.The chemogenesis of flow cleavage had the characteristics of the ordering of the Archean strata,proven by a great deal of data on iron and massive sulphide deposits.The sequence of Archean basicly accorded with greenstone sequence.The granitegreenstone cycle was an important basis for dividing Archean eon. 2.In light of protolith types and metamorphic degree,it was considered that there were no "high grade zone",but a higher grade metamorphic greenstone belt.The feature that supercrustal rocks occurred pairedly with mid acid intrusive rockbody shows that a tectonic stage is a cycle beginning from volcanic sedimentation and ended with intrusion. 3.The rock types of Archean metamorphic plutonic intrusion were complex.The present petrographic classification and names existed some problems,so the author suggested that diorite,TTG series should be expanded,and metamorphogenic charnockite gneiss should be listed in charnockite series. 4.Archean structure deformation developed from flattening to extension to compression.Metamorphism associated with deformation,showing a complete deformation metamorphism cycle. 5.On the northern edge of North China Landmass,there were iron,massive sulphide,gold metamorphosed volcanic sedimentary,metamorphosed volcanic hydrothermal and metamorphic hydrothermal deposits.The types of deposit were closely related with some special composition of the host rocks.