Collecting And Integration Of The Geological Information Of Granitoids

The trace technique of granitoids' information's is becoming the hot topic of current geosciences. After the proposing of the I-S type classification of granitoids by Chappell and R.White(1974), tracing the crustal composing, structure and evolution with granitoids had coming into a new period. Lately, many theories (including the crustal remelting theory and the geochemical fields theory based on the crustal remelting theory, the new classification of the geotectonic setting of granitoids, the orientation mechanism of granitoids etc.) have been furthered. However, all of these are due to the acquisition of the geological information and the research of the trace of the granitoids.Granitoids contain ample geological information and are the first choice of geologists who studiy the geosphere and trace the crustal evolution. Tracing these information is the main approach to solve the problems of continental evolution and the continental dynamics. To research the integration and application of these information is not only very important in geosciences, but also is an important way to facilitate the innovation of the geological theory about granitoids.Collecting and integration of information is the main content of the tracing research. The main ways to collect the information of granitoids include the macroscopical way, the microcosmic way, the integration and application of the information acquired by these ways. The aims of this thesis are to propose a system of collecting the geological information of granitoids, so that the research of collecting, integration and application can be operated completely, systemically, effectively, and standard in this platform.Tianshui region locates in the meeting part of the Qilian orogenic belt and Qinling orogenic belt. The granitoids that have a variety of category is widespread in this area. The granites occurred in both major geologic eras and major phases of tectonic evolvement. And structural zonation is evident. As a result, the granites in this area have recorded the important information perfectly, such as the crustal structure, crustal evolution, etc.In recent years, the author has carried out collection and investigation work of geological information of granitoids in this area. To sum up, most of the information is credible, the theory of information collection is correct, the method is reasonable, and the analyzed data are precise. The collected information, which is well defined, completive, accurate, and very useful, is the foundation of our research.By comprehensive analysis, there is obvious difference in the geological information of granitoids of three magmatic belts in Tianshui region. North Qinling amalgamated Qilian orogenic belt by subduction of Jinning-Caledonian period; Central Qinling connect with North Qinling by collision. Information of south granitoids belt shows "open—close" tectonic evolution history. Geological information of Granitoids and geochemical information successively shows the composition, formation process and time of source regions. It also provides very important information of crustal evolution and geological mines searching in the region. Geophysical information such as pictures of regional gravity anomaly, residual gravity anomaly, Mohole isobaths, aeromagnetic anomaly, and the two-dimensional section of gravity and electric power,successively verifies crustal structure, tectonic frame and granitoids location, etc. Regional geochemical information shows the distribution of the granitoids and parts of the- buried granites. Remote information provides some reference information of regional linear structures and distribution of parts of the granites.By researching ion the integration tracing of this information, this thesis tries to form the important concepts of Granitoids' Information Collection System (GICS) and concludes the method to attain granitoids' geological information and major information types. On the basis of these work, it provides important thoughts, integrate methods, integrate principle and expression mode of the integrate production of GICS, and it well shows crustal evolution history, process and mode in the region. Instead of this, the process of the information integration promotes the deepening of geological research. This probe of integration research is useful to integrate informatics with geosciences, enrich Informatics research, spread informatics' service and utilization in geosciences and establish the foundation of showing geological information's trace. In short, the research of the granitoids' information integration can greatly shows crustal evolution history and solves important geological problems.The main conclusions and contributions of this thesis are as follows:It concludes that "accumulation, taxonomy, filtration and concentration" is the basic method of geological information collection of granitoids and proposes a kind of expression method of information integration production whose major component is "modularization" picture. Based on the fact of research region, four types of granitoids information integration are summarized, that is, "special cause of formation" type, "different tectonic division" type, "structure of adjacent tectonic units" type and "macroscopic— fault" type. For the first time, it defines Mishuling magmatic body, Wenquan body (wushan) and Huoyanshan body as magma mixing granitoids rock. The magma mixing information gained from research is of great use and significance for the crustal accretion, action between crust and mantle and crust evolution. By the particular research of Wenquan magmatic mixing rock, it is found that the forming of molybdenum mine is the result of magma mixing. This new important thought is of instructing meaning for mine search practice in the region. Some lately gained data of high-solution stable isotope trace and isotope chronology can solve many problems such as source, cause of formation and precise geological age of many magmatic bodies. It establishes the distributing features of three tectonic magma belts and concludes each tectonic magma belt's part and effect in five tectonic periods. It also makes a comprehensive discussion and analysis about the source, cause of formation, intrusion time and evolution process. The author finds many magmatic bodies such as Zhangoumen gneissic body, Fanjiaqu gneissic body and Yuantanhe gneissic body, and then studies their geological and geochemical information, which is very useful for discussing the relation between Qilian and Qinling tectonic units and their evolution process. It well disposes Dangchuan-Dabao batholite, and by analysis of the geological and geochemical information of Huashuping magmatic body, Caijiazhuang body, Tianzishan body and Moshangou body, it concludes that they are production of the same magmatic action, then gain a new understanding of "Caijiazhuang-Baguasban-Tianzishan magma belt". All work is of great importance for the study of regional geological structure and geological mine search.