Rapporter och meddelanden 106 Geochemical classification of plutonic rocks in central and northern Sweden Martin Ahl, Stefan Bergman, Ulf Bergström,

81 4 Crystal-chemical relations and classification problems in tourmalines 7 : Geochemistry and petrogenesis of Mesoproterozoic A-type granitoids from the

Stats Avg Trail Rating. Recent The sandstone-hosted Osen lead deposit, Norway: new Pb isotope evidence for sourcing in the underlying granitoid basement. As the granitoids in the Svecofennian region generally fall into two major age Senast uppdaterad: 17 oktober, Land classification is based on the status of the av JA BROPHY — ing mainly on computer classification). YVB and adjacent sediments and granitoids (Figs. 1, 2). other granites, most notably the Prosperous Lake Granite to.

Granitoids classification

Same as Figure 11 of main text, using Shand's (1927) diagram. Mineralogical classification of granitoids based on modal abundance.This scheme is based on measurable parameters. It employs modal proportions of quartz, alkali-feldspar and plagioclase. All thin sections were point counted from each granitoid samples and the classification is performed as follows.Thin section Y-02 contains alkali feldspar peraluminous granitoids of crustal origin, «tholei-itic» and alkaline granitoids of mantle origin, and calc-alkaline granitoids of mixed origin with various proportions of crustal and mantle-derived compo-nents. The first part ends with a comparison of the proposed typology with the twenty most used genetic classifications of granitoids.

Herron, M. M., 1988: Geochemical classification of terrigenous sands and shales Signatures of the Pensamiento Granitoid Complex, RondonianSan Ignacio

Since an ideal genetic classification is not in sight, it is concluded that a somewhat closely defined, descriptive fourfold grouping on a chemical and mineralogical basis may be more useful than the present rather vague twofold division. AGeochemical Classification for Feldspathic Igneous Rocks B. RONALD FROST* AND CAROL D. FROST DEPARTMENT OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF WYOMING, LARAMIE, WY 82072, USA RECEIVED MAY 13, 2008; ACCEPTED OCTOBER 3, 2008 ADVANCE ACCESS PUBLICATION NOVEMBER 20, 2008 In this paper we classify the range of feldspathic igneous rocks Classification of the Continental Crust Transformation Series Granitoids in South China Based on the differences in tectonic setting, source material compositton and formation pattern, the authors suggest that the continental crust transformation series granitoids (Xu Keqing et al., 1984) in South China be subdivided into three types. The geochemical classification of the basin type granitoids based on the FeNumber, the modified alkali- -lime index and the aluminium saturation index, defined the rocks as mainly mag- nesian, alkali, alkali-calcic to calc-alkali and peraluminous respetively. Geochemical classification of the granitoids.

compositions. The premise was that each of these groups tends to form in an analogous geotectonic. environment from comparable sources: RTG – ridge tholeiitic granitoids (plagiogranites), ATG – arc. ^tholeiitic _ granitoids, AG – amphibole-rich calc-alkaline granitoids, KCG – K-rich and Kfs-phyric.

Basalt, andesit, diabas. Ryolit/dacit. to those suggested by the zircon classification developed by Belousova et al.

They further classified as: (1) Subduction-related older granites; (2) suture-related or Post-orogenic younger granites and (3) intraplate anorogenic younger granites [ 35 ]. major classification schemes of the granitoids. Modal mineralogy/IUGS classification This scheme is based on measurable pa-rameters. It employs modal proportions of quartz, alkali-feldspar and plagioclase.
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The other Feb 15, 2011 Another way of looking at the classification of granitic rocks is based on the Many S-type granitoids are found in the deeply eroded cores of Aug 13, 2018 A granitoid meets two criteria: (1) it is a plutonic rock that (2) has and assess only the felsic component, it can still be properly classified. Granitoid masses of the Golpayegan area from structural zones classification are considered within the Sanandaj-Sirjan zone. According to tectonic settings of Jan 19, 2019 on the Quartz-Alkali Feldspar-Plagioclase (QAP) classification dia- gram (after Strekeisen 1976).

In the classification proposed here, three main groups of granitoids correspond respectively to a crustal, a mantle, or a mixed (crustal and mantle) origin of the magmas. Each of these main groups is subdivided into two or three types. A-type granite is a particular category of the S-I-A-M or 'alphabet' system which classifies granitoids and granitic rock by their photoliths or source. The 'A' stands for Anorogenic or Anhydrous, as these granites are characterized by low water content and a lack of orogenic or transitional tectonic fabric.
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new Pb isotope evidence for sourcing in the underlying granitoid basement. 81 4 Crystal-chemical relations and classification problems in tourmalines

The first part ends with a comparison of the proposed typology with the twenty most used genetic classifications of granitoids. Granitoid magmas are emplaced at the upper crust under a complex interaction of gravitational processes and horizontal tectonics.

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81 4 Crystal-chemical relations and classification problems in tourmalines 7 : Geochemistry and petrogenesis of Mesoproterozoic A-type granitoids from the

81 4 Crystal-chemical relations and classification problems in tourmalines 7 : Geochemistry and petrogenesis of Mesoproterozoic A-type granitoids from the Class of material General classification of the material the object is made of. The volcanic pile is intruded by a synvolcanic Jorn-type granitoid Viterliden new Pb isotope evidence for sourcing in the underlying granitoid basement.

Classification of the Continental Crust Transformation Series Granitoids in South China Based on the differences in tectonic setting, source material compositton and formation pattern, the authors suggest that the continental crust transformation series granitoids (Xu Keqing et al., 1984) in South China be subdivided into three types.

tourmalines from late-Variscan peraluminous granites of the Arbus pluton SW 81 4 Crystal-chemical relations and classification problems in tourmalines new Pb isotope evidence for sourcing in the underlying granitoid basement. 81 4 Crystal-chemical relations and classification problems in tourmalines Their mechanical properties can with varying certainty be classified according to and improvement of the expert system's classification keys for granitoids and in the test program: Black diabase, light granitoid, limestone and schist and the following 3 different classification and designation [2].

Geochemical classification of plutonic rocks in central and northern Sweden Martin Ahl, Stefan Bergman, Ulf Bergström, Thomas Eliasson, Magnus Ripa & Pär Weihed Final report of research project 5172: ”Geochemical classification of Swedish granitoids” at the Geological Survey of Sweden Sveriges Geologiska Undersökning 2001 Petrogenetic types of granitoids Classification of granitoid rocks is based on their source rocks; I-type granites are derived from igneous sources, whereas S-type granites are sourced from sedimentary rocks (Chappell and White, 1974, 1992, 2001). classification of granite. …high amounts of Na 2 O, and S-type granitoids, derived from sedimentary protoliths and containing high amounts of Al 2 O 3 and relatively low amounts of Na 2 O. Amphibole and pyroxene are more common in I-type granitoids, while S-type granitoids may have garnet, cordierite, and sillimanite. Both types of granitoids Classification of Granitoids from the Golpayegan Area on the Basis of the Tectonic Setting: M. Sharifi , M. Noghreyan , H. Safaei , I. Noorbehsht and J. Ahmadian : Abstract: Granitoid masses of the Golpayegan area from structural zones classification are considered within the Sanandaj-Sirjan zone. According to tectonic settings of granitoids various patterns are used for tectonic This geochemical classification of granitic rocks is based upon three variables. These are FeO / (FeO + MgO) = Fe-number [or FeO tot / (FeO tot + MgO) = Fe*], the modified alkali-lime index (MALI) (Na 2 O + K 2 O - CaO) and the aluminum saturation index (ASI) [Al/(Ca - 1.67P + Na + K)]. The Fe-number (or Fe*) distinguishes ferroan granitoids, which manifest strong iron enrichment, from AGeochemical Classification for Feldspathic Igneous Rocks B. RONALD FROST* AND CAROL D. FROST DEPARTMENT OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF WYOMING, LARAMIE, WY 82072, USA RECEIVED MAY 13, 2008; ACCEPTED OCTOBER 3, 2008 ADVANCE ACCESS PUBLICATION NOVEMBER 20, 2008 In this paper we classify the range of feldspathic igneous rocks This geochemical classification of granitic rocks is based upon three variables.