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Plutonic Rocks
Published in Dexter Perkins, Kevin R. Henke, Adam C. Simon, Lance D. Yarbrough, Earth Materials, 2019
Dexter Perkins, Kevin R. Henke, Adam C. Simon, Lance D. Yarbrough
Mafic and ultramafic magmas crystallize in steps over a range of temperature. So, high-temperature minerals (e.g., olivine, spinel, or magnetite) commonly are enclosed by lower-temperature minerals (augite, hornblende, or pyroxene). Plagioclase is often the last mineral to crystallize and, consequently, may fill interstices between larger Fe- and Mg-rich mineral crystals. In some rocks, however, especially some diabase and gabbro, plagioclase crystallizes first and becomes included in later-formed pyroxene. Although plagioclase and pyroxene dominate mafic rocks, lesser amounts of amphibole, olivine, oxides, and other minerals may also be present.
Experimental and numerical investigations of microwave-induced damage and fracture formation in rock
Published in Journal of Thermal Stresses, 2020
Tao Xu, Lei He, Yanlong Zheng, Xingxing Zou, Vahid Badrkhani, Dominik Schillinger
China Black Diabase samples is used in this study, which is a basic epiphytic intrusive rock with the mineral composition of plagioclase (65%), pyroxene (29%), olivine (3%) and other accessory minerals (3%). The sample was taken from the same rock mass block with good consistency and no visible cracks. Petrographic thin sections of diabase were prepared and observed under plane polarized light (PPL) and cross polarized light (XPL) using a Zeiss microscope, as shown in Figure 2. Plagioclase grain is slender with a length range from 30 to 300 μm, with some slender plagioclase grain intrusions up to 700 μm in length. The mineral is fine-grained with uniform distribution. Table 1 lists the electrical and physical properties of the diabase tested.
Development and validation of an enhanced test setup for assessing HMA stripping potential under hydrodynamic pressure
Published in Road Materials and Pavement Design, 2020
Xiaodi Hu, Meng Jiang, Tao Bai, Pan Pan, Lubinda F. Walubita
As can be seen in Table 2, the main components of diabase are Si, Fe, Al, Ca, and Mg, with proportions of 44.430%, 13.937%, 13.771%, 9.746%, and 8.339%, respectively. The limestone possessed similar essential elements with a high percentage as diabase, but their composition proportions are different as shown in Table 3. It was obvious that the ignition loss of limestone was too much larger than diabase. Similarly, the XRF results in Table 4 shows that the essential elements in the suspension were also Si, Fe, Al, Ca, and Mg in proportions of 29.718%, 10.495%, 10.540%, 16.980% and 7.641%, respectively (Figure 6).
Investigation on the morphological and mineralogical properties of coarse aggregates under VSI crushing operation
Published in International Journal of Pavement Engineering, 2021
Chonghui Wang, Hainian Wang, Markus Oeser, Mohd Rosli Mohd Hasan
Petrographic examination revealed that diabase aggregate comprised of several mineral phases, namely quartz, feldspars (plagioclase), and biotite. Additionally, quartz and feldspars particles are relatively hard, exhibiting a Moh’s hardness value of 7 and 6, respectively. In contrast, biotite is relatively softer with a Moh’s hardness value between 2 and 3.