CN-122017191-A - Method for identifying rock magma hydrothermal type ore deposit ore-forming fluid indicating element

CN122017191ACN 122017191 ACN122017191 ACN 122017191ACN-122017191-A

Abstract

The invention relates to the technical field of magma hot liquid type ore deposit geological survey, in particular to a method for identifying magma hot liquid type ore deposit ore forming fluid indicating elements, which comprises the steps of firstly, systematically collecting non-changed raw rock and rock samples of each changed zone, and carrying out all-rock geochemical analysis; the method comprises the steps of determining inert components based on a Isocon graph method, quantitatively calculating the relative mass mobility of each element to judge the migration or extraction behavior of each element, adopting a Speermann rank correlation analysis and setting a statistical threshold value to objectively extract a strong positive correlation element combination from data, and finally, carrying out cross validation on the migration element and the strong positive correlation combination to comprehensively determine an indication element combination closely related to the mineral fluid activity. The invention realizes the transition from experience judgment to quantification and statistical analysis, obviously improves the accuracy and reliability of the identification of the indicating element, and provides an effective technical means for the research of mineral deposit causes and mineral exploration.

Inventors

LI ZHIPENG
LIU XUELONG
LI WENCHANG
Ao Jingjing
LUO CONG
Lu Bode

Assignees

昆明理工大学

Dates

Publication Date: 20260512
Application Date: 20260120

Claims (9)

1. A method of identifying a magma hydrothermal type ore deposit ore-forming fluid indicator element, comprising the steps of: s1, sample collection and data acquisition, namely, collecting an original rock sample which is not changed and rock samples in different changed zones in a investigation region, and carrying out all-rock geochemical analysis on all samples to acquire content data of principal elements, microelements and rare earth elements; S2, quantitatively analyzing element migration behaviors, namely calculating the relative mass migration quantity of each element in each alteration zone by adopting a mass balance method based on inert component calibration based on the non-altered original rock, so as to judge the migration or migration state of each element in the alteration process; S3, performing element combination correlation analysis, namely performing non-parameter correlation analysis on the content data acquired in the step S1, calculating correlation coefficients among element pairs, and screening element combinations with strong positive correlation relations according to preset correlation coefficients and significance thresholds; And S4, comprehensively judging the indication elements, namely screening out the elements which are judged to be migrated in the step S2 and belong to the same strong positive correlation element combination in the step S3, and determining the group of elements as the indication elements of the ore-forming fluid.
2. The method according to claim 1, wherein the mass balance method based on inert component calibration in the step S2 is a Isocon graph method, and specifically comprises the steps of determining inert element components in the process of alteration to serve as internal standards by plotting a scatter diagram of element contents in raw rock and altered rock and fitting a straight line passing through an origin.
3. The method of claim 2, wherein the Isocon mapping method further includes the step of normalizing by taking a certain alteration band normalization factor K of 1 in addition to the original rock sample, the remaining alteration band normalization factor K calculated using the formula: Wherein K is a normalization factor, and the normalization factor, For a selected normalization factor of 1 for the content of the inactive component i of the alteration band, The calculated content of inactive component i of the alteration tape.
4. A method according to claim 3, characterized in that the mass mobility of element m in the zone of alteration a relative to the original rock O is calculated using the following formula: Wherein the method comprises the steps of Is the element mass transfer rate; Refers to the mass of element m as it changes from the original rock to the alteration zone a; Refers to the mass of element m in the original rock; refers to the concentration of element m in the sample of the alteration zone A; refers to the concentration of element m in the original rock; Refers to the concentration of the inactive component i in the raw rock; refers to the concentration of inactive component i in the sample of alteration zone a.
5. The method of claim 1, wherein the non-parametric correlation analysis in step S3 is a Szechwan rank correlation analysis, and the correlation coefficient and significance threshold is the absolute value of the Szechwan correlation coefficient Not less than 0.7, and a significance p value <0.05.
6. The method of claim 1, wherein the all-rock geochemical analysis in step S1 includes at least quantitative analysis of major elements SiO 2 、Al 2 O 3 、TFe 2 O 3 、MgO、CaO、Na 2 O、K 2 O、TiO 2 、P 2 O 5 、MnO and loss on ignition LOI, trace elements Cu, zn, pb, sn, rb, sr, zr, nb, mo, ba, hf, ta, W, th, U, and rare earth elements La, ce, pr, nd, sm, eu, gd, tb, dy, ho, er, tm, yb, lu, Y.
7. The method of claim 1, wherein the criterion for migration in step S4 is that in the normalized Isocon diagram, the data point above the Isocon line indicates that the corresponding element is migrated and the data point below indicates that the corresponding element is migrated.
8. A combination of mineralised fluid indicating elements as identified by the method of any one of claims 1 to 7, wherein the combination comprises a plurality of elements co-migrating during the alteration and having a strong positive correlation for use in the combined indication of mineralised fluid activity.
9. Use of a combination of ore-forming fluid indicator elements according to claim 8 for circumscribing a target area for mine exploration or evaluating a mineralization zone in magma hydrothermal type deposit exploration.

Description

Method for identifying rock magma hydrothermal type ore deposit ore-forming fluid indicating element Technical Field The invention relates to the technical field of magma hot-liquid type ore deposit geological exploration, in particular to a method for identifying magma hot-liquid type ore deposit ore-forming fluid indicating elements. Background Magma hot-liquid type ore deposit is an important source of key metal resources such as copper, molybdenum, gold, silver, tin, tungsten and the like. The formation of such deposits is essentially the result of complex material and energy exchange with the surrounding rock during migration of the hydrothermal fluid from the deep-section magma house, resulting in precipitation and enrichment of the mineral-forming material at the site of the beneficial formations. Therefore, whether the geochemical characteristics of the ore-forming fluid, especially the specific element combination (namely the indicating element) can be accurately identified has a great significance for understanding the ore-forming process and guiding the mineral exploration. For a long time, in the practice of petrochemistry research and exploration, the mainstream methods for identifying indication elements of ore-forming fluids mainly comprise the steps of identifying single element anomalies, using empirical element combinations and traditional element correlation analysis, and lack of a method capable of accurately identifying indication element combinations closely related to specific ore-forming fluid activities. The invention aims to overcome the defects of the prior art and provide a more accurate, reliable and geology clear indication element identification method. Disclosure of Invention The invention aims to provide a method for identifying a magma hot liquid type ore deposit ore-forming fluid indicating element, which realizes the accurate and objective identification of the ore-forming fluid dedicated indicating element by quantitatively analyzing the element mass mobility in the alteration process and comprehensively judging by combining with statistically related element symbiotic combination. In order to achieve the technical purpose and the technical effect, the invention is realized by the following technical scheme: A method of identifying a magma hydrothermal type ore deposit ore-forming fluid indicator element, comprising the steps of: s1, sample collection and data acquisition, namely, collecting an original rock sample which is not changed and rock samples in different changed zones in a investigation region, and carrying out all-rock geochemical analysis on all samples to acquire content data of principal elements, microelements and rare earth elements; S2, quantitatively analyzing element migration behaviors, namely calculating the relative mass migration quantity of each element in each alteration zone by adopting a mass balance method based on inert component calibration based on the non-altered original rock, so as to judge the migration or migration state of each element in the alteration process; S3, performing element combination correlation analysis, namely performing non-parameter correlation analysis on the content data acquired in the step S1, calculating correlation coefficients among element pairs, and screening element combinations with strong positive correlation relations according to preset correlation coefficients and significance thresholds; And S4, comprehensively judging the indication elements, namely screening out the elements which are judged to be migrated in the step S2 and belong to the same strong positive correlation element combination in the step S3, and determining the group of elements as the indication elements of the ore-forming fluid. Further, the mass balance method based on inert component calibration in the step S2 is a Isocon drawing method, and specifically comprises the steps of determining inert element components in the process of alteration as internal standards by drawing a scatter diagram of element contents in original rock and altered rock and fitting a straight line passing through an origin. Further, the Isocon drawing method further comprises a normalization step of taking a certain alteration band normalization factor K as 1 except for the original rock sample, and calculating the remaining alteration band normalization factor K by using a formula 1: Wherein K is a normalization factor, and the normalization factor, For a selected normalization factor of 1 for the content of the inactive component i of the alteration band,The calculated content of inactive component i of the alteration tape. Further, the mass mobility of element m in the alteration zone a relative to the original rock O was calculated using the following formula: Mass mobility positive indicates migration and negative indicates migration, wherein Is the element mass transfer rate; Refers to the mass of element m as it changes from the original rock to the