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Geology and Mineralogy of Gemstones. David Turner R.Читать онлайн книгу.

Geology and Mineralogy of Gemstones - David Turner R.


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alt="Photo depicts faulting (red dashed line) and folding (yellow dashed line) in limestone along a creek bed in the Dominican Republic."/> Schematic illustration of schematic diagram of diamonds hosted in kimberlite pipes that are then eroded to form alluvial deposits.

      Rocks can also effectively be dissolved and removed over long periods of time without significant erosion from running water. Minerals that are most susceptible to weathering will be dissolved and carried away first, while those that are resistant will be left over in the residual material. These “leftovers” are often called residual or resistant minerals and are concentrated where the original rock source was located. Thus, these so‐called eluvial deposits are best formed in tropical environments where weathering rates are high (e.g., Brazil). Because these deposits have been transported the least distance from their original source, excavation is usually uncomplicated. However, targeting these locations requires knowledge of the underlying geology or luck.

      1 Earle, S. (2015). Physical Geology. Victoria, B.C.: BCcampus. Retrieved from https://opentextbc.ca/geology/

      2 Oliver, N. H. S., & Bons, P. D. (2001). Mechanisms of fluid flow and fluid–rock interaction in fossil metamorphic hydrothermal systems inferred from vein–wallrock patterns, geometry and microstructure. Geofluids, 1(2), 137–162.

      3 Wegener, A. (1912). Die entstehung der kontinente. Geologische Rundschau, 3(4), 276–292.

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