A classification of volcanic and plutonic rocks using r1r2diagram and majorelement analyses. A classification of volcanic and plutonic rocks using r1r2diagram and majorelement analyses its. Recommendations of the international union of geological sciences subcommission on. The construction of the total alkalisilica chemical. Classification diagram after oconnor 1965 for silicarich rocks quartz 10 %.
Streckeisen diagram or qapf diagram based on the streickeisen nomenclature for plutoic rocks. Recommendations of the international union of geological sciences subcommission on the systematics of igneous rocks r. It is based on cipwnormative volcanic, plutonic rocks or modal plutonic rocks contents of albite, anorthite and kfeldspar. Classification and nomenclature of volcanic rocks, lamprophyres. Chemical classification of volcanic rocks based on the.
Granite instead of the whole or a part of the mica, there may be hornblende, or, rarely, pyroxene augite. Total alkali sodium plus potassium, expressed as oxides is a fair proxy for the alkali or atop modal dimension of the volcanic qap diagram, and silica total silicon as sio 2 is a fair proxy for the quartz or q direction. The hercynian intrusive rocks of the catalonian coastal. The chemical classification of carbonatites using weight percent oxides. Plutonic rocks are classified and named according to mineral contents. Zanettin, iugs subcommission on the systematics of igneous rocks, a chemical classification of volcanic rocks based on the total. A chemicalmineralogical classification of common plutonic rocks and associations volume 73 issue 3 f. Lastly the very simple streckeisen modal qapf diagram offers a suitable framework where plutonic rocks may be organised in rock typeseries fig. The construction of the total alkalisilica chemical classification of volcanic rocks. The modal composition of the plutonic rocks can be quantified but in the case of volcanic. All structured data from the file and property namespaces is available under the creative commons cc0 license. These mineral mode estimates can then be plotted on projected onto streckeisen ternary diagrams, to classify the rocks in the normal manner.
Petrography the branch of geology dealing with the description and systematic classification of rocks, especially by microscopic examination of thin sections. This procedure requires conversion of the normative mass mineral proportions into the volume. Lebas and streckeisen, 1991 are the standard references for current nomenclature. A chemicalmineralogical classification of common plutonic. Pdf lithogeochemical classification of igneous rocks. Lithogeochemical classification of igneous rocks using. The hercynian intrusive rocks of the catalonian coastal ranges ne spain. The classification of igneous rocks is largely based on two diagrams. To each plutonic rock its proper name sciencedirect. The corners of the double triangle are q quartz, a alkali feldspar, p plagioclase and f feldpathoid. How do you use the streckeisen qapf classification ternary diagram to identify igneous rocks based on chemical rock composition.
Up to the present, the subcommission has been concerned with plutonic rocks. Geochemical classification of plutonic rocks in central. This page was last edited on 20 november 2015, at 20. This new approach has advantages over conventional classification strategies, in that it is relatively inexpensive, adaptable to all forms of igneous rocks, quantitative, accurate, and precise. A qapf diagram is a double triangle diagram which is used to classify igneous rocks based on mineralogic composition. Albert streckeiseniugsiugssubcommission on the systematics of igneous rocks1974. The hercynian outcrops of the catalonian coastal ranges ne spain consist mainly of lower permianupper carboniferous, the catalonian coastal ranges consist of wo, post. Pdf lithogeochemical classification of igneous rocks using.
Within the qapfm classification scheme proposed by the iugs, rocks with less than 90 vol% mafic minerals are classified by their content in volume% of. Figure 3 from the iugs systematics of igneous rocks. The present classification of the lamprophyres the iugs systematics of igneous rocks skip to search form skip to. Diagram qapf wikipedia bahasa indonesia, ensiklopedia bebas. If this is the first time you use this feature, you will be asked to authorise cambridge core to connect with your account. Geologists worldwide accept the diagrams as a classification of igneous, especially plutonic rocks. Qapf diagrams were created by the international union of geological sciences iugs. Degassingvolatiles release hydrothermal alteration and lowgrade metamorphism crystal accumulation presence of xenocrysts and. Plot on the qap diagram streckeisen, 1976 of plutonic rocks of the montnegre massif. I made the schemes using the coordinates provided in the following book.
To demonstrate this new procedure, results from classifications of metaluminous, peraluminous, and alkaline felsic plutonic and volcanic rocks, and mafic and ultramafic plutonic and volcanic rocks are compared with mineral modes acquired by independent means visual estimates, point counts, image analysis, spectrometry. The qap ternary diagram is used to classify igneous rocks. Streckeisen, 1976 to each plutonic rock its proper name. Qapf diagram for plutonic rocks formed in the crust and tas diagram for volcanic rocks. Diagram qapf dibuat oleh international union of geological sciences iugs. The iugs systematics of igneous rocks skip to search form. Geologists usually use the tas classification because its more consistent. High heat producing volcanoplutonic rocks of the siner area, malani igneous suite, western rajasthan. If done correctly, the lines for all 3 components should cross at the same point plotting on ternary diagrams 2 the plotting position for this. The qap ternary diagram is used to classify igneous rocks with visible mineral grains phaneritic texture from their feldspar and quartz content. Explanation of the qapf diagram used to classify igneous rocks. In any classification scheme, boundaries between classes are set arbitrarily. Subcommission on the systematics of igneous rocks fostered by albert streckeisen whence their alternative name.
Texture is used to subdivide igneous rocks into two major groups. Pdf in order to create a sustainable classification of igneous rocks which all. O binary classification diagram of middlemost 1985 for plutonic rocks. Timescales and mechanisms of crystalmush rejuvenation and melt extraction recorded in permian plutonic. Leterrier p, grandclaude p, marchal m 1980 a classification of volcanic and plutonic rocks using the rlr2 diagram and major element analyses. Anor classification of the igneous rocks based on their sio2ca. The paper comments on the recommendations on which the iugs subcommission on the systematics of igneous rocks agreed at montreal, august 1972. Table 2 from the iugs systematics of igneous rocks. Albert streckeisen 8 november 1901 29 september 1998 was a swiss petrographer and petrologist, the son of basel forensic scientist adolf streckeisen. It cools slowly tens of thousands of years or longer, underneath earths crust, which allows the individual crystals to grow large by coalescing, like with like. Plutonic rocks are also known as intrusive igneous rocks because they form when magma squeezes into. Pdf the iugs systematics of igneous rocks researchgate.
Igneous rocks are classified on the basis of mineralogy, chemistry, and texture. Modal qapf diagram of streckeisen 1978 modal qapf diagram of streckeisen 1974 scope. The acronym, qapf, stands for quartz, alkali feldspar, plagioclase, feldspathoid foid. Is a process involving changes in the mineral contentcomposition andor microstructure of a rock, dominantly in the solid state. Find and download geochemical rock classification, series and tectonic discriminant templates. Subcommission on the systematics of igneous rocks ditemukan oleh albert streckeisen itulah sebabnya nama lain diagram ini adalah. Igneous rock igneous rock classification of plutonic rocks. A plutonic rock may be classified mineralogically based on the actual proportion of the various minerals of which it is composed called the mode. Remember that porphyritic rocks have spent time in both worlds. Streckeisen, 1976 to each plutonic rock its proper name free download as pdf file. It is strongly recommended that these descriptions and examples of plutonic rocks be read with the specimens in hand, obtainable, as noted before, from the geological survey. Igneous rock classification of plutonic rocks britannica. Geochemical classification of plutonic rocks in central and northern sweden 5 the swedish national grid, numbered 2, from south to north.
In those days each new rock described by a geologist could have shown characteristics different than the rocks that had already been described, so there was a tendency to give the new and different rock a new name. A chemical classification of volcanic rocks based on the total alkalisilica diagram. The basic classification is the same as for plutonic rocks. For example, aphanitic rocks are iugs classification of igneous rocks volcanic origin while phaneritic rocks are plutonic. This paper presents a summary of the recommendations on plutonic rocks to which the subcommission has agreed at its meeting of. Color scheme is based on articles on the english language wikipedia. Plutonic rocks are igneous rocks that solidified from a melt at great depth. Lecture 5 plutonic structures and field relationships friday, february 4th, 2005 figure 420. Plutonic rocks are rocks formed when magma cools and solidifies below the earths surface.
A more informative way to name plutonic rocks geological. Igneous rock classification using diagrams thoughtco. These are the mineral groups used for classification in qapf diagram. Lets first examine the classification of plutonic rocks. The qapf and related diagrams are intended for classification of rocks in the field, or preliminary classification with modal proportions as seen in the optical microscope. For each component, you always measure from zero of that component opposite side toward the corner of that component. Rocks with m less than 90 are named according to their positions in the qapf diagram. Ahli geologi seluruh dunia menerima diagram ini sebagai alat untuk klasifikasi batuan beku, terutama batuan plutonik.
Magma rises, bringing minerals and precious metals such as gold, silver, molybdenum, and lead with it, forcing its way into older rocks. Lithogeochemical classification of igneous rocks using streckeisen ternary diagrams article pdf available in geochemistry exploration environment analysis 172. Qapf streckeisen ternary diagram used to classify the composition of. Files are available under licenses specified on their description page. Figure field numbers of the qapf diagram for plutonic rocks based on streckeisen, fig. This process is mainly due to an adjustment of the rock to physical conditions that differ from those under which the rock originally formed and that also differ from the physical conditions normally occurring at the surface of the.