By A. E. Adams

Greater than half the world's petroleum is located in carbonate rocks, significantly within the heart East, the previous USSR, and North the United States. those rocks express a bewildering number of grains and textures, as a result of the wealth of alternative fossil organisms which give a contribution to their sedimentation and to the numerous diagenetic strategies which alter textures and imprecise the unique deposits and upholstery. cautious petrographic learn with a polarizing microscope is a key point for learning carbonate sediments, as a comparability to box or center logging, and as a precursor to geochemical research. This atlas illustrates in complete colour various beneficial properties of carbonate rocks and sediments, assurance way more broad than in any basic textbook. it's designed as a realistic consultant for deciding upon grain kinds and textures in carbonates and should allure alike to undergraduate and graduate scholars and to execs in either examine and commercial laboratories.

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Extra resources for A Colour Atlas of Carbonate Sediments and Rocks under the Microscope

Sample text

Thirdly, and most impor­ tantly, it is vital to describe the wall structure. When looking at ancient carbonates the first step is to decide whether the wall structure is well preserved and therefore that it was of primary calcite miner­ alogy, or whether it is preserved as a mould or cast, and was therefore of primary aragonite mineralogy which has subsequently been altered. In the case of calcitic bioclasts it is then necessary to describe the wall structure by looking at the shape, size and orientation of the component crystals.

84-86 are pictures of a brachiopod that shows three layers. There is a thin outer layer (upper sur­ face of shell as seen in the photograph) which is finely prismatic and can be best seen in the highmagnification crossed polars view (86). Beneath this there is a typical brachiopod foliated layer and a thick inner prismatic layer, the structure of which is most clearly seen in the low-magnification view taken with polars crossed (85). 83 Stained thin section. Lower Carboniferous, Lancashire, England, PPL, x 50.

It is a cast of an originally vidual prisms with their polygonal cross-section can aragonitic bivalve shell which has been replaced by readily be seen. Along the top of the picture is a sparry calcite, either by solution followed by later shell fragment with a foliated structure. In this cementation, or by in situ recrystallisation (neomor­ example, the structure is quite irregular with bun­ phism, p. 128). The fourth fragment visible in this dles of calcite lamellae orientated in different photograph is the elongate fragment to the right of directions.

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