By Kurt Hollocher
This booklet is an illustrative advent to metamorphic rocks as visible within the box, designed for complex highschool to graduate-level earth technological know-how and geology scholars to jump-start their observational abilities. as well as images of rocks within the box, there are lots of line diagrams and examples of metamorphic good points proven in skinny part. the skinny part pictures are all at a scale and in a context that may be relating to perspectives visible within the box via a hand lens.
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Extra resources for A Pictorial Guide to Metamorphic Rocks in the Field
This page intentionally left blank Part 1: Metamorphic rock types Chapter 2 Pelitic rocks The word pelite is derived from Greek, meaning clay-rock. ) are formed mostly from clays that are produced from the chemical weathering of feldspars, micas, and other minerals. Shales are the most abundant sedimentary rock type, so not surprisingly metamorphic rocks derived from them are also abundant. Although shales can themselves seem monotonous and nearly featureless, metamorphosed shales can differ strikingly from one another in appearance.
All three samples have a foliation oriented from upper right to lower left. A, B) Feldspathic quartzite, fine-grained with porphyroclasts of feldspar, quartz, and scattered detrital zircon and tourmaline crystals. The weak foliation is defined by rare muscovite and abundant, elongate quartz grains. Bennington, Vermont, USA. C, D) Partially recrystallized, very clean quartzite with only a few zircon and muscovite crystals. The weak foliation is defined by muscovite and some elongate quartz grains.
Abundant sulfides indicate an anoxic depositional environment, which speaks to marine circulation patterns and photosynthetic productivity in the original sedimentary basin. Some pelitic rocks are interlayered with quartzite, commonly derived from sandy turbidite deposits. Other pelitic rocks can be calcareous, or host calcareous horizons, possibly indicating nearby carbonate platforms supplying fine-grained carbonate detritus, or open ocean deposition above the carbonate compensation depth. Such variations can be used to distinguish different pelitic rock units from one another in the field, and so can allow mapping of them even in what might seem at first to be an endless sea of schist.