单词	petrography
释义	petrography /pɛˈtrɒɡrəfi / noun [mass noun] The branch of science concerned with the composition and properties of rocks.All aspects of oceanic island rocks, including petrography, volcanology, and geochemistry, are inter-related. Thus, no one scale of observation is entirely satisfactory to understanding their origin.... The field-based studies were supplemented by thin-section petrography and whole-rock geochemistry to characterize different intrusive phases. The lavas have been divided into two main series (informally called the lower volcanics and the plateau basalts) based on their stratigraphy, geochemistry and petrography. Derivatives petrographer /pɪˈtrɒɡrəfə / noun ... But there are some questions that even the best petrographer cannot answer, such as whether a chemical admixture was used in the mix and, if so, how much, what type of Portland cement was used, or what the water/cement ratio was. If the petrographer can document that such changes occurred during the laboratory examination, that may provide useful information on the concrete's condition. If you want to unravel the mystery of why your nonstructural concrete cracked, your best option is to consult your competent, friendly petrographer. petrographic /pɛtrəˈɡrafɪk / adjective ... Interpretation of these spherules as impact-related has been challenged, but is supported by petrographic contrasts with volcanic ejecta, iridium and related siderophile anomalies, Ni-rich spinels and chromium isotopes. Destructive geochemical methods are commonly combined with petrographic methods (thin sections, stained sections, cathodoluminescence) to interpret the history of rock cementation. Various combinations of these processes are invoked to account for the range of geochemical and petrographic features in tale-alkaline continental margin volcanic arc suites. petrographical /pɛtrəˈɡrafɪk(ə)l/ adjective ... During the mid-1980s to early 1990s more research took place that involved detailed petrographical and geochemical studies on the syenites, alkaline, and peralkaline rocks. The petrographical and geochemical data provide little evidence for the existence of a contemporaneous volcanic arc and the igneous material is interpreted instead to have been derived from a palaeovolcanic source. The provenance of turbidites from the predominantly Arenig-aged Manx Group has been constrained using petrographical and geochemical techniques.
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