Method for judging whether basalt originates from EMI type or EMII type ground curtain

A basalt and mantle technology, applied in computational models, complex mathematical operations, instruments, etc., can solve problems such as the high cost of mantle end members and the inability of major and trace elements to effectively distinguish EMI type and EMII type mantle end members, so as to reduce costs. Effect

Active Publication Date: 2021-02-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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Problems solved by technology

[0004] The present invention provides a method for identifying the origin of basalt from EM I or EM II mantle by using the main and trace elements of rocks. Aiming at the difficulties in the current study of mantle end members, the EM mantle end members are taken as the research object, and the key point is to solve the problem of dividing the mantle by isotopes. Due to the high cost of endmembers and the inability to effectively distinguish EMI-type and EMII-type mantle endmembers with major and trace elements, based on machine learning algorithms, a major and trace element discrimination index for EMI-type and EMII-type mantle endmembers is proposed, so as to provide a basis for comprehensive utilization of the mantle. Elemental geochemical characteristics of source magmatic rocks provide reference for distinguishing mantle end members

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  • Method for judging whether basalt originates from EMI type or EMII type ground curtain
  • Method for judging whether basalt originates from EMI type or EMII type ground curtain
  • Method for judging whether basalt originates from EMI type or EMII type ground curtain

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Embodiment 1

[0030] The present invention utilizes the global shared geochemical database GEOROC (http: / / georoc.mpch-mainz.gwdg.de / georoc / ) and PetDb (http: / / www.earthchem.org / petdb), based on the research results of mantle-derived volcanic rock isotopes , taking the basalts produced by EMI-type and EMII-type mantle endmembers as the research object, using machine learning methods to excavate the differences between the data of two different mantle endmember basalts, and establishing the main data for EMI-type and EMII-type mantle endmembers. Trace element identification index, the specific steps are as follows:

[0031] Step 1: Collect data on EMI and EMII mantle endmember basalts;

[0032] According to the research results of Sr-Nd-Pb isotopes of mantle-derived volcanic rocks, the data of oceanic islands and island group basalts representing EMI and EMII mantle end members were systematically collected. Pitcairn-Gambier (Pitcairn-Gambier Islands), Tristan da Cunha (Tristan da Cunha Isla...

Embodiment 2

[0048] On the basis of embodiment one, further take the EM type basalt sample in a certain area as an example to illustrate the specific application steps of the invention:

[0049] The first step: standardization of sample data

[0050] The element content of the basalt samples is shown in Table 2. The Box-Cox transformation is performed on each element by using formula (1). The λ value of each element in formula (1) is shown in Table 3. After Box-Cox transformation, formula (2) was used to standardize the Z-score of the transformed element content. The values ​​of μ and σ in formula (2) are shown in Tables 4 and 5. Finally, the element contents of the standardized basalt samples are shown in Table 6.

[0051] Table 2 Elements and Sr, Nd isotopic contents of basalt samples

[0052]

[0053]

[0054] The λ value of each element in Table 3 (reserve two decimal places)

[0055] SiO 2

TiO 2

Al 2 o 3

FeOT CaO MgO MnO K 2 o

Na 2 ...

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Abstract

The invention discloses a method for judging whether basalt originates from an EMI type ground curtain or an EMII type ground curtain by utilizing main trace elements of rock. The method comprises thefollowing steps: step 1, collecting EMI type and EMII type ground curtain end member basalt data; 2, standardizing the data; 3, training a logistic regression model; and 4, determining EMI type and EMII type ground curtain end member element discrimination indexes; according to the method, the cost of distinguishing the EMI type ground curtain end member and the EMII type ground curtain end member by using isotopes is reduced, the problem that the EMI type ground curtain end member and the EMII type ground curtain end member cannot be distinguished by using main trace elements in the traditional research is solved, the main trace element distinguishing index based on the EMI type ground curtain end member and the EMII type ground curtain end member is provided, and the EM type ground curtain end member is distinguished.

Description

technical field [0001] The invention relates to the field of rock geochemistry, in particular to a method for judging that basalt originates from EM I or EM II mantle by using major and trace elements of rocks. Background technique [0002] After the formation of the original solid Earth, its deep and shallow materials are constantly in the process of convective circulation and thermal evolution, and the material composition inside the mantle is highly heterogeneous. Understanding and identifying the heterogeneity of the mantle is very important for exploring the material circulation inside the mantle and revealing the evolution of the earth. is of great significance. At present, the understanding of mantle heterogeneity is mainly based on isotopic research methods. During the process of the original magma produced by partial melting of the mantle and directly ejected from the surface to form mantle-derived magmatic rocks, the Sr-Nd-Pb isotope remains unchanged. The composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/70G06N20/00G06F17/18
CPCG16C20/70G06N20/00G06F17/18
Inventor 孟凡超刘浩毅左耿超田雨露杜青毛少华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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