Influence of Mineralogical and Petrographic Properties on the Mechanical Behavior of Granitic and Mafic Rocks

This study investigates the impact of mineralogical and petrographic characteristics on the mechanical behavior of granitic and mafic rocks from the Shuangjiangkou (Sichuan Province) and Damiao complexes (Hebei Province) in China. The research methodology combined petrographic investigation, compris...

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Vydané v:Minerals (Basel) Ročník 15; číslo 7; s. 747
Hlavní autori: Waqar, Muhammad Faisal, Guo, Songfeng, Qi, Shengwen, Karim, Malik Aoun Murtaza, Zada, Khan, Ahmed, Izhar, Shang, Yanjun
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Basel MDPI AG 17.07.2025
Predmet:
Anorthosite
Composition
Compressive strength
Crystalline rocks
Density
Design engineering
Electron microscopy
Failure
Failure modes
Fault lines
Feldspars
Fractures (Geology)
Fracturing
Geology
Grain size
Granite
Gravity
Hydroelectric power
Light microscopy
Mechanical properties
Mica
Microporosity
Mineralogy
Minerals
Optical microscopy
Physical properties
Plagioclase
Porosity
Quartz
Research methods
Rock
Rock masses
Scanning electron microscopy
Specific gravity
Stress concentration
Water absorption
X-ray spectroscopy
China
Sichuan China
Hebei China
ISSN:2075-163X, 2075-163X
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Shrnutí:This study investigates the impact of mineralogical and petrographic characteristics on the mechanical behavior of granitic and mafic rocks from the Shuangjiangkou (Sichuan Province) and Damiao complexes (Hebei Province) in China. The research methodology combined petrographic investigation, comprising optical microscopy and Scanning Electron Microscopy–Energy-Dispersive X-ray Spectroscopy (SEM-EDS) methods, with methodical geotechnical characterization to establish quantitative relationships between mineralogical composition and engineering properties. The petrographic studies revealed three lithologic groups: fine-to-medium-grained Shuangjiangkou granite (45%–60% feldspar, 27%–35% quartz, 10%–15% mica), plagioclase-rich anorthosite (more than 90% of plagioclase), and intermediate mangerite (40%–50% of plagioclase, 25%–35% of perthite). The uniaxial compressive strength tests showed great variations: granite (127.53 ± 15.07 MPa), anorthosite (167.81 ± 23.45 MPa), and mangerite (205.12 ± 23.87 MPa). Physical properties demonstrated inverse correlations between mechanical strength and both water absorption (granite: 0.25%–0.42%; anorthosite: 0.07%–0.44%; mangerite: 0.10%–0.25%) and apparent porosity (granite: 0.75%–0.92%; anorthosite: 0.20%–1.20%; mangerite: 0.29%–0.69%), with positive correlations to specific gravity (granite: 1.88–3.03; anorthosite: 2.67–2.90; mangerite: 2.43–2.99). Critical petrographic features controlling mechanical behavior include the following: (1) mica content in granite creating anisotropic properties, (2) extensive feldspar alteration through sericitization increasing microporosity and reducing intergranular cohesion, (3) plagioclase micro-fracturing and alteration to clinozoisite–sericite assemblages in anorthosite creating weakness networks, and (4) mangerite’s superior composition of >95% hard minerals with minimal sheet mineral content and limited alteration. Failure mode analysis indicated distinct patterns: granite experiencing shear-dominated failure (30–45° diagonal planes), anorthosite demonstrated tensile fracturing with vertical splitting, and mangerite showed catastrophic brittle failure with extensive fracture networks. These findings provide quantitative frameworks that relate petrographic features to engineering behavior, offering valuable insights for rock mass assessment and engineering design in similar crystalline rock terrains.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:2075-163X
2075-163X
DOI:10.3390/min15070747