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A Study On The Abundance Relationships Among Trace Elements And Its Application

Posted on:2005-02-05Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z C WangFull Text:PDF
GTID:1100360155958542Subject:Mineral prospecting and exploration
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This dissertation aims at one of the key geochemical problems - the natural law of elemental abundance relationship. It discusses the definitions and mathematical reductions of abundance, abundance potential and migration potential, based on the physicochemical theories such as Henry's law, chemical potential, and etc.; realizes the system parameters (abundance constant, phase constant and migration strength which represent the direction, spatial location and length of an evolutionary line) as geochemical data measured from the evolutionary line; and proposes a powerful tool for trace element geochemical study - a four dimensional "abundance coordinate system" (abbreviated to ACS), on which the elemental abundance relationship can be observed from four dimensions. The key points of this dissertation are ACS, REE abundance structure, migration structure, petrogeneous discrimination of igneous rock series, and identification of tectonic setting of basalts.The study in this dissertation is a part of the project "The Trace Element Geochemical Study On Mantle Geodynamics In the Source Region of Emeishan Basalts" (DH99-01), which is granted and supported by the open funds of Sichuan Provincial Key Laboratory Of Geo-Nuclear Technology.The main results of this dissertation are as follows:(1) Introduces the ACS which is a double logarithmic coordinate system and has a space with eight 'quadrants' that are four two-dimensional plans; discusses the geochemical characteristics of this four dimensional space, where the study of abundance relation could proceed simultaneously by more view angles of several two-dimensional planar coordinates on the four dimensional ACS; and explores mathematical regularity of four dimensional space. The ACS is a new powerful tool in geochemical study of abundance relationship. A compositional point in ACS could define a swallow-form curve of the chondrite -normalized REE patterns and eight different REE abundance patterns could be classified, based on which quadrant the point of the REE abundance is located. Therefore the quantitative geochemical study on large number of REE data could be processed on ACS accurately and precisely.(2) Realizes a series of measurable parameters of geochemistry system (for example, igneous rock series); discusses connotation and measurement method of the system parameters (such as migration potential and three system parameters of REE trend lines) in accordance with the theory of chemical potential of physicochemistry. Based on the research results from large number of samples, it is difficult to get the information of petrogenesis by the swallow-form curves but is easy by the study on ACS, and the system parameters of an igneous rock series (natural system) could be calculated from the REE trend line on ACS, according to the REE spatial distribution of data from large number of samples of an igneous rock series; reveals REE differentiation regulation, including the differentiation of whole REE, Eu abnormal and Ce abnormal; and discriminates the petrogenesis type of rock more accurately according to the quantitative model of three system parameters (direction, strength, spatial distribution) of REE...
Keywords/Search Tags:ACS (a bundance coordinate system), abundance structure, migration structure, petrogenesis discrimination of igneous rock, tectonic setting identification of basalts
PDF Full Text Request
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