Method for determining metallogenic age of rare metal pegmatite

A rare metal and pegmatite technology, applied in the field of chronology, can solve the problems of incomplete application and inaccurate acquisition of rare metal pegmatite mineralization age, etc., to achieve strong applicability, excellent test accuracy, and solve error problems Effect

Active Publication Date: 2021-07-09
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies or defects, the purpose of the present invention is to provide a method for determining the metallogenic age of rare metal pegmatites, which can effectively solve the problem that the direct dating of rare metal minerals in the prior art cannot accurately obtain the metallogenic age of rare metal pegmatites. and not fully applicable to the problem of rare metal pegmatites

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  • Method for determining metallogenic age of rare metal pegmatite
  • Method for determining metallogenic age of rare metal pegmatite
  • Method for determining metallogenic age of rare metal pegmatite

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Embodiment 1

[0039] This embodiment 1 provides a method for determining the ore-forming age of rare metal pegmatites, which specifically includes the following steps:

[0040] Step (1): Collect rare metal pegmatite samples in the field; specifically collect spodumene pegmatites without obvious structural deformation (spodumene in spodumene pegmatites) from the Lijiagou No. XI ore body in Keryin Ore Field in western Sichuan Stone volume ratio > 15vol%, referred to as Lijiagou sample);

[0041] Step (2): Cut a part of the Lijiagou sample in step (1) into light thin slices with a thickness of 0.3 mm, and observe the monazite rare metal minerals and other rare metal minerals and rock-forming minerals under binoculars. Symbiotic relationship, looking for monazite rare metal minerals with sparse distribution of single particles and particles in interstitial form or contained in primary quartz, feldspar or biotite;

[0042] Step (3): The sample is crushed, washed with heavy sand, and sorted by m...

Embodiment 2

[0061] This embodiment 2 provides a method for determining the ore-forming age of rare metal pegmatites. The difference from embodiment 1 is that the rare metal pegmatite samples in step (1) are specifically collected from the Plum The Genze microplagioclase albite pegmatite in the eastern part of the Jiagou deposit (Genze microplagioclase albite pegmatite contains less spodumene, accounting for less than 3% of the volume, hereinafter referred to as the Genze sample), and the rest of the steps are the same .

[0062] The results of step (2), step (3), step (4) and step (5) in Example 2 show that the root sample contains more cassiterite and monazite of pegmatite magma origin. under the microscope as Figure 5 As shown, cassiterite, monazite (Mnz) and albite (Ab) co-exist in the Genze sample, and the backscattering image observation shows that the single mineral also has the characteristics of pegmatite magma origin. Monazite particles are all larger than 100um (the particle ...

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Abstract

The invention discloses a method for determining metallogenic age of rare metal pegmatite, which belongs to the technical field of chronology and mainly comprises the following steps: (1), collecting rare metal pegmatite samples in the field; (2) cutting the sample in the step (1) into polished thin slices, and observing monazite rare metal minerals in the sample under a mirror; (3) pre-treating a sample, sticking a target to prepare the target, and taking a picture; (4) observing the rare metal minerals in the target sample obtained in the step (3) again; (5) performing component analysis on rare earth and trace elements of monazite rare metal minerals on the target sample which is not subjected to hydrothermal alteration and obtained in the step (3) through adoption of an LA-ICP-MS method; and (6) carrying out U-Pb dating on the monazite caused by magma on the target sample. According to the method, new rare metal minerals suitable for U-Pb dating in rare metal pegmatite are developed, the mineralization age can be rapidly obtained, and the accuracy is high.

Description

technical field [0001] The invention relates to the technical field of chronology, in particular to a method for determining the ore-forming age of rare metal pegmatites. Background technique [0002] Rare metal pegmatite is a hard rock-type rare metal resource, rich in key strategic metals such as lithium, beryllium, niobium, tantalum, and tin. It is widely used in aerospace, national defense, and new energy vehicles, and has important strategic value. Accurate chronological research on spodumene pegmatites is of great scientific and practical significance for revealing the genetic mechanism of pegmatite deposits and guiding the next step of prospecting and exploration. It is of great strategic significance to develop and utilize key strategic mineral resources and build a strategic emerging industry mineral base. [0003] The research on the ore-forming age of rare metal pegmatite is based on the mineral composition and symbiotic relationship of pegmatite, and the morphol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/626G01N1/28G01N1/36
CPCG01N27/62G01N1/286G01N1/36G01N2001/2866G01N2001/366Y02P10/20
Inventor 费光春袁彦伟李佑国郑硌
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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