Method for calculating magmatic oxygen fugacity by utilizing uraninite in granite

A technology of granite and oxygen fugacity, applied in the geological field, can solve the problems of reducing the accuracy of oxygen fugacity value, unable to realize direct test, affecting the reliability of estimation, etc., to achieve improved redox reaction, strong reliability and operability strong effect

CN107561241AActive Publication Date: 2018-01-09BEIJING RES INST OF URANIUM GEOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-01-09

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Abstract

The invention belongs to the geotechnical field and particularly discloses a method for calculating magmatic oxygen fugacity by utilizing uraninite in granite. The method comprises the following steps: step 1, acquiring a granite sample containing a uraninite auxiliary mineral; step 2, performing pretreatment and crystalline uranium ore single mineral separation on the granite sample acquired in the step 1 to obtain granite sample uraninite particles; step 3, performing scanning electron microscopy on the granite sample uraninite particles obtained in the step 2; step 4, performing uranium valence state photoelectron spectroscopy test on the granite sample uraninite particles preferably selected from the step 3 to obtain a U6+ / U4+ ratio in the uraninite; step 5, substituting the U6+ / U4+ ratio obtained by uraninite test analysis in the step 4 into an oxygen fugacity estimation formula to obtain a magmatic oxygen fugacity estimation value logfO2. The method provided by the invention is strong in operability, and can be used for testing directly with little test error.
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Description

technical field

[0001] The invention belongs to the technical field of geology, and in particular relates to a method for calculating magma oxygen fugacity by using crystalline uranium ore in granite. Background technique

[0002] At present, the research methods to calculate the oxygen fugacity of magma mainly include: (1) Direct measurement by means of oxygen probe and other methods through drilling construction. (2) Use rock-forming minerals containing variable valence elements to indirectly estimate the oxygen fugacity conditions during magma crystallization, such as using titanium-iron oxide combinations to estimate, using Fe in whole rocks or minerals (such as biotite) 2+ and Fe 3+ Ratio estimation. (3) Calculation of Ce by zircon lattice strain model (Lattice-strain Model) 3+ / C 4+ The relative value is combined with the Ti content in zircon to estimate the temperature, and then estimate the magma oxygen fugacity value.

[0003] In the above commonly used oxygen ...

Examples

Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0026] Such as figure 1 , 2 As shown, the present invention will be described in further detail below taking the Wuliting rock mass in Ganzhou City, Jiangxi Province as an example.

[0027] A method for calculating magma oxygen fugacity by using crystalline uranium ore in granite provided by the present invention, the method specifically includes the following steps:

[0028] Step 1. Collect granite samples containing crystalline uranium ore accessory minerals

[0029] The collected granite samples are required to be fresh, with a size of 3×6×9cm, at least 10 samples, and a collection weight of 5kg.

[0030] For example, a field geological survey was carried out on the Dajishan rock mass in Quannan County, Ganzhou City, Jiangxi Province, and fresh granite samples were collected, with a sample weight of 5kg.

[0031] Step 2. Pretreatment an...