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Petrophysical properties (density and magnetization) of rocks from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia and their implications.

Yang T, Gao J, Gu Z, Dagva B, Tserenpil B - ScientificWorldJournal (2013)

Bottom Line: Based on the rock classifications and tectonic units, petrophysical parameters (bulk density, magnetic susceptibility, intensity of natural remanent magnetization, and Köenigsberger ratio) of these rocks are summarized.Results indicate that (1) significant density contrast of different rocks would result in variable gravity anomalies along the profile; (2) magnetic susceptibility and natural remanent magnetization of all rocks are variable, covering 5-6 orders of magnitude, which would make a variable induced magnetization and further links to complex magnetic anomalies in ground surface; (3) the distribution of rocks with different lithologies controls the pattern of lithospheric magnetic anomaly along the profile.The petrophysical database thus provides not only one of the keys to understand the geological history and structure of the profile, but also essential information for analysis and interpretation of the geophysical (e.g., magnetic and gravity) survey data.

View Article: PubMed Central - PubMed

Affiliation: Institute of Geophysics, China Earthquake Administration, Beijing 100081, China.

ABSTRACT
Petrophysical properties of 585 rock samples from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia are presented. Based on the rock classifications and tectonic units, petrophysical parameters (bulk density, magnetic susceptibility, intensity of natural remanent magnetization, and Köenigsberger ratio) of these rocks are summarized. Results indicate that (1) significant density contrast of different rocks would result in variable gravity anomalies along the profile; (2) magnetic susceptibility and natural remanent magnetization of all rocks are variable, covering 5-6 orders of magnitude, which would make a variable induced magnetization and further links to complex magnetic anomalies in ground surface; (3) the distribution of rocks with different lithologies controls the pattern of lithospheric magnetic anomaly along the profile. The petrophysical database thus provides not only one of the keys to understand the geological history and structure of the profile, but also essential information for analysis and interpretation of the geophysical (e.g., magnetic and gravity) survey data.

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Histogram for (a) ρ, (b) κ, (c) NRM, and (d) Q of sedimentary rock samples.
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fig3: Histogram for (a) ρ, (b) κ, (c) NRM, and (d) Q of sedimentary rock samples.

Mentions: Magnetic susceptibility of sedimentary rock mainly depends on the composition and content of accessory minerals (e.g., magnetite, maghemite, hematite, and iron hydroxides) [19]. κ and NRM of sedimentary rock mainly range in 10~100 × 10−5 SI and 1~10 mA/m, respectively (Figures 3(b) and 3(c)). Among them, clastic sedimentary rocks have higher κ and NRM than chemical sedimentary rocks (Table 1). Generally, Q value is lower than 1 (Figure 3(d)), indicating that their magnetization is dominated by induced magnetization.


Petrophysical properties (density and magnetization) of rocks from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia and their implications.

Yang T, Gao J, Gu Z, Dagva B, Tserenpil B - ScientificWorldJournal (2013)

Histogram for (a) ρ, (b) κ, (c) NRM, and (d) Q of sedimentary rock samples.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3842065&req=5

fig3: Histogram for (a) ρ, (b) κ, (c) NRM, and (d) Q of sedimentary rock samples.
Mentions: Magnetic susceptibility of sedimentary rock mainly depends on the composition and content of accessory minerals (e.g., magnetite, maghemite, hematite, and iron hydroxides) [19]. κ and NRM of sedimentary rock mainly range in 10~100 × 10−5 SI and 1~10 mA/m, respectively (Figures 3(b) and 3(c)). Among them, clastic sedimentary rocks have higher κ and NRM than chemical sedimentary rocks (Table 1). Generally, Q value is lower than 1 (Figure 3(d)), indicating that their magnetization is dominated by induced magnetization.

Bottom Line: Based on the rock classifications and tectonic units, petrophysical parameters (bulk density, magnetic susceptibility, intensity of natural remanent magnetization, and Köenigsberger ratio) of these rocks are summarized.Results indicate that (1) significant density contrast of different rocks would result in variable gravity anomalies along the profile; (2) magnetic susceptibility and natural remanent magnetization of all rocks are variable, covering 5-6 orders of magnitude, which would make a variable induced magnetization and further links to complex magnetic anomalies in ground surface; (3) the distribution of rocks with different lithologies controls the pattern of lithospheric magnetic anomaly along the profile.The petrophysical database thus provides not only one of the keys to understand the geological history and structure of the profile, but also essential information for analysis and interpretation of the geophysical (e.g., magnetic and gravity) survey data.

View Article: PubMed Central - PubMed

Affiliation: Institute of Geophysics, China Earthquake Administration, Beijing 100081, China.

ABSTRACT
Petrophysical properties of 585 rock samples from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia are presented. Based on the rock classifications and tectonic units, petrophysical parameters (bulk density, magnetic susceptibility, intensity of natural remanent magnetization, and Köenigsberger ratio) of these rocks are summarized. Results indicate that (1) significant density contrast of different rocks would result in variable gravity anomalies along the profile; (2) magnetic susceptibility and natural remanent magnetization of all rocks are variable, covering 5-6 orders of magnitude, which would make a variable induced magnetization and further links to complex magnetic anomalies in ground surface; (3) the distribution of rocks with different lithologies controls the pattern of lithospheric magnetic anomaly along the profile. The petrophysical database thus provides not only one of the keys to understand the geological history and structure of the profile, but also essential information for analysis and interpretation of the geophysical (e.g., magnetic and gravity) survey data.

Show MeSH
Related in: MedlinePlus