Na–plagioclase is approximately twice the K-feldspar in content. Figure 23.6. It is an altered andesite (volcanic analogue of diorite and hence has much finer grain size). It is evident from Fig. Symbology: circle – average, line – median, central box – middle of data between Q1 and Q3, outlier circle 1.5*(Q3-Q1), triangle – far outlier further than 3*(Q3-Q1), and whiskers – extreme values that are not outliers; (B) Box and whisker plot comparing the Ce/Yb ratio of samples from the QD, MIQD, and HMIQD Units from within individual Offset Dykes and allowing for comparison of abundance levels in different dykes and their geological setting in the North and South Ranges. Narrow pull-apart basins contain andesite to rhyolite lavas and rhyolitic tuffs that were deposited on deformed and metamorphosed Visean rocks, suggesting several kilometres of uplift and erosion before 300 Ma. Diorite has a strict definition based on the QAPF diagram — more than 90% of feldspar is plagioclase, quartz content is lower than 5% and plagioclase contains more sodium than calcium. Smooth irregular granite boulders (top), product of typical weathering, present a scenic landscape near ancient city of Aswan, southeastern Egypt rising through the blue water of River Nile. These Offsets are developed in the footwall of the SIC over a lateral distance approaching 70 km strike length of the base of the SIC. Senja, Norway. 4.7) in the gold district east of Yamethin contains hornblende and may be an I-type intrusion. alkali-feldspar granites, granites, quartz-monzonite, The mineral system characteristics of the Sudbury Ni-Cu-Co-PGE sulfide ore deposits. Another very similar rock, but here the light-colored mineral is scapolite (marialite), not plagioclase. The phenocryst, in turn, is partially ganitized with mineral aggregates of potassium feldspar, quartz, biotite and amphiboles, Aswan quarry, south-central Egypt. Narvik, Norway. At the late stage of the Eoarchean (3.68−3.62 Ga), some of these Eoarchean rocks were exposed upon the surface where they underwent weathering and erosion, producing sediments that were then deposited in basins to form the sedimentary protoliths of the Baijiafen supracrustals, whose depositional time has been well constrained at 3.68−3.62 Ga by their youngest detrital zircon age of ~3.68 Ga, and a 3.62 Ga trondhjemitic vein that intrudes the supracrustals (Liu et al., 2008a). Diorite with tonalite pegmatite. MgO — 3.77 4.6C). Symbology is explained in Fig. (D) Strongly deformed trondhjemitic gneiss variety in the riverbed of the Matsanjeni River, possibly representing a strongly deformed variety of the Mhlatuzane Gneiss. 4.7C). Adamellite (named after the town Adamello in Tyrol) is a felsic intrusive igneous rock with hipidiomorphic texture similar to quartz monzonite (monzonite with some quartz). Width of sample 11 cm. 2.20J). The builders and architects are often wrongly designates all the grain intrusive igneous rocks, especially the granodiorite, diorite and gabbro by the name “granite”. This plot shows a broad similarity in the shape of the pattern for each of the rock group, but the rocks from the Funnel have lower trace element abundances relative to the abundances in the QD and MIQD Units of the dyke. Averages are based on data in Lightfoot et al. FIGURE 4.9. Diorite (/ ˈ d aɪ. Copyright © 2020 Elsevier B.V. or its licensors or contributors. This plot illustrates that the inclusions from within the Offset Dyke have patterns with the same slope and abundance levels to the Sudbury Gabbro. It is composed of quartz, biotite and plagioclase (andesine or oligoclase). 4.6(A)). 4.7C; Zurbrigg, 1957). Relative to the average North Range Main Mass, the QD Unit of the Offset Dykes is depleted in most incompatible elements; they have similar Eu and Rb abundances, and they are enriched in Sr. Varieties deficient in hornblende and other dark minerals are called leucodiorite. The sulfide inclusions share a similar [Ni]100 with the lower grade massive sulfides from the eastern flank of the Stobie mineral system (see Fig. 23.6C). The sample was photographed courtesy of the Exploration Staff at Stobie Mine where it resides. It also contains ferromagnesian minerals (biotite, hornblende, and augite). The relationship between the disseminated sulfides hosted in MIQD and the massive sulfides with inclusions, but lesser amounts of silicate matrix, provides important constraints on the sequence of events at Stobie. Fig. The Stobie mineral system narrows from ∼300 m wide and ∼1 km long at surface to terminate at a depth of ∼1 km (Fig. Beyond the immediate footprint of the Frood-Stobie Deposit, the mineral system is bracketed between weakly magnetic granitoid rocks of the Murray Pluton and the more dense mafic volcanic rocks and parts of the Frood Intrusion (Chapter 2). (I) Comparison of the average composition of the QD Unit from the Worthington Offset, low and high-Mg variants of the Nipissing Diabase, and the Sudbury Gabbro intrusions which partially contain the Worthington Offset at Totten Mine or occur as inclusions in the semimassive sulfides. Sample from Hannukainen, Finland. In detail, the averages of the QD and MIQD Units from these North Range Offset Dykes exhibit elevated Rb and K, a weak negative slope in the REE, and low normalized abundances of Ba, Th, U, Nb, and Ta relative to the LREE. (F) Variations in the composition of the QD, MIQD, and HMIQD Units based on the average composition of samples from the Worthington Offset and the Ethel Lake QD normalized to the composition of the average Foy QD Unit.
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