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Method for identifying paleo-salinity of lacustrine facies deposition

A lacustrine sediment and salinity technology, which is applied in the field of lacustrine sediment paleo-salinity identification, can solve the problems of low credibility of paleo-salinity identification results, achieve good practical application value, enrich identification methods, Good specificity and sensitivity effect

Pending Publication Date: 2022-06-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the credibility of the paleo-salinity identification results obtained from this plate is not high, and it is necessary to develop a new identification method

Method used

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  • Method for identifying paleo-salinity of lacustrine facies deposition
  • Method for identifying paleo-salinity of lacustrine facies deposition
  • Method for identifying paleo-salinity of lacustrine facies deposition

Examples

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Effect test

Embodiment 1

[0037] The present embodiment verifies the accuracy of a method for discriminating the paleo-salinity of lacustrine sediments provided by the present invention, including the following steps:

[0038] (1) Collect mudstone samples known to be formed by deposition of high-salt lacustrine facies, use deionized water and analytically pure methanol to clean the mudstone samples, and then crush the samples until the sample size is ≥200 mesh;

[0039] (2) Weigh 80 g of the pulverized sample in step (1), carry out Soxhlet extraction with a mixed solution of dichloromethane and methanol with a volume ratio of 9:1, and the extraction time is 72h to obtain an extract;

[0040] (3) adding n-hexane to the extract obtained in step (2) and stirring evenly, standing for precipitation, filtering, and taking the filtrate; the filtrate is filled with SiO with a volume ratio of 3:1 2 -Al 2 O 3 The separation column is eluted and separated, wherein the eluent is a mixed solution of n-hexane and ...

Embodiment 2

[0049] The only difference between this example and Example 1 is that the mudstone samples formed by the deposition of the middle salt lake facies are collected.

Embodiment 3

[0051] The only difference between this example and Example 1 is that the mudstone samples formed by lacustrine deposition of brackish water to normal seawater salinity are collected.

[0052] Example of effect

[0053] In this effect example, the relative abundance data of various types of dehydroxylated microbial E-compounds in different mudstone samples obtained in Examples 1-3 are put into a paleo-salinity identification triangle. The results of the points are as follows: Figure 4 shown, from Figure 4 It can be seen that the relative abundance data of various types of dehydroxylated microbial E-compounds in different mudstone samples obtained in Examples 1-3 completely fall into the high-salt areas and medium-salt areas in the paleo-salinity identification triangle. The salinity region and the brackish to normal seawater salinity region, that is, whether it is high salinity or low salinity, the palaeosalinity identification results of the samples in Examples 1-3 are in ...

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Abstract

The invention discloses a lacustrine facies deposition paleo-salinity identification method, and belongs to the technical field of deposition organic geochemistry. The lacustrine facies deposition paleosalinity identification method comprises the following steps: (1) pretreating a mudstone sample, and extracting and separating to obtain an aromatic hydrocarbon component; (2) detecting and calculating relative abundance of monomethyl, dimethyl and trimethyl dehydroxylated vitamin E compounds in the aromatic hydrocarbon component to obtain relative abundance data; (3) establishing a paleosalinity identification triangular chart taking relative abundance of monomethyl, dimethyl and trimethyl dehydroxylation microbial E compounds as end members; (4) plumbing the relative abundance data into the paleo-salinity identification triangular chart to obtain deposited paleo-salinity information; according to the method disclosed by the invention, the dehydroxylated vitamin E is used for identifying the paleo-salinity, and the paleo-salinity identifying triangular chart taking the relative abundance of monomethyl, dimethyl and trimethyl dehydroxylated vitamin E compounds as end members is established, so that the obtained identifying method has high specificity, credibility and sensitivity.

Description

technical field [0001] The invention belongs to the technical field of sedimentary organic geochemistry, and in particular relates to a method for judging paleo-salinity of lacustrine sediments. Background technique [0002] Salinity is an important basic chemical parameter of water bodies, and the reconstruction of lacustrine sedimentary paleo-salinity is of great significance in various studies such as paleoenvironment, paleoclimate and paleoecology. At present, the commonly used methods for reconstructing paleo-salinity of lacustrine sediments are mainly trace element ratio method, isotope method and paleontological method; among which the trace element ratio method is the most commonly used, and on this basis, various formulas for calculating paleo-salinity are derived. The ratio method also has certain limitations in practical application. The boundaries of paleo-salinity in different regions cannot be determined by the same element parameter value, which has multiple s...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06G01N30/72G16C10/00G01N24/08
CPCG01N30/02G01N30/06G01N30/72G01N24/081G16C10/00
Inventor 江凯禧苏明王策雷亚平尹幸佳孟峥刘佳威
Owner SUN YAT SEN UNIV
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