Unit 1: Crystal Fractionation and Partial Melting of Igneous Rock Suites Exercise 1:A basaltic melt contains 150 ppm Ni, 100 ppm Sr, 3 ppm Yb and 10 ppm Rb. Use the following K d values to calculate the concentrations of each element in the residual melt after 20% Rayleigh fractionation ...
One thin section was made in the horizontal plane of each block and sections were made in either one or both of the vertical planes. Mosaics of digital photographs were analyzed using Scion Image. Data on the sizes and orientations of plagioclase crystals were compiled on spreadsheets and ...
rocks and their textures A companion volume to the Atlas of Rock-forming Minerals in Thin Section...
Atlas of igneous rocks and their textures A companion volume to the Atlas of Rock-forming Minerals in Thin Section, this full-colour handbook is designed t... WS Mackenzie,CH Donaldson,C Guilford - Longman, 被引量: 332发表: 1982年 Igneous Rocks: A Classification and Glossary of Terms (Reco...
At Lombo Vermelho (e), fragments of the Mesozoic limestone units are also found. These clasts are poorly sorted and set in a matrix that shows signs of hydrothermal alteration. The conglomerate varies between matrix- and clast-supported textures (b–e) Full size image...
Extremely voluminous magmatic systems known as large igneous provinces (LIPs) punctuate Earth’s history, and the gases they release plausibly link large-scale geodynamic and magmatic processes with major climate shifts in Earth’s geological record. How
Also noteworthy (Fig. 5d) is the occurrence of textures that were previously referred to as 'migmatite' and attributed to partial melting of the footwall norite in a thermal aureole below the UG1 chromitite23. In Fig. 5g,h, we document the occurrence of stacked sills of lithologies ...
This study is the first to examine the extent of Sr isotopic homogeneity among coexisting igneous minerals containing high Sr (>3000 ppm) and low Rb (≪1 ppm) contents within a single ∼50-μm-thick thin-section mount. This technique is capable of producing measured 87...
Abstract The end-Cretaceous (ca. 66 Ma) Phenaimata alkaline igneous complex, associated in space and time with the Deccan large igneous province (LIP) in Western India, consists of bimodal (tholeiitic to alkaline) differentiated plutonic to volcanic igneous rocks. Mineralogy and petrology of variab...
6b, f). They occur either as randomly, or irregularly distributed, longitudinal textures of similar ~10 µm diameters. Fig. 6: Filaments and degraded bitumen. a Photograph and c–e BSE-SEM images of mineralized filaments in a mycelium-like network on bitumen, adjacent to calcite (and ...