Based on the data on the structure state of feldspars and two-feldspar or feldspar-nepheline geothermometry, the forming temperatures of these rockbodies have been estimated.
On the basis of the microprobe analyses for coexisting alkali feldspar and plagioclase, the equilibrium temperatures of the alkali feldspars are calculated using several ternary two-feldspar geothermometers.
In this paper, the relationship of magma crystallization temperatures of the three bodies is discussed based on Al-Si order-disorder and cell parameters of feldspars, and the composition of biotites. P, T, f_(O2) and f_(H2O) for each granite body when the magma emplaced and crystallized are evaluated by means of estimating the thickness of the overlying strata, two-fieldspar geothermometer, homogenization temperaure of fluid inclusions in quartz, and biotite fugacity indicator.
Two-feldspar, two-mica, biotite-amphibole, biotite-pyroxene, and pyroxene-amphibole intergrowths have been revealed in syenitic and miaskitic pegmatites.
Regular quartz-feldspar (graphic) and two-feldspar intergrowths are typical of granitic pegmatites.
Two-feldspar geothermometry, geobarometry in mesozonal granitic intrusions: Three examples from the Piedmont of Georgia
Two-feldspar geothermometry in granulite facies metamorphic rocks
Towards a more practical two-feldspar geothermometer
The alkali-feldspar phenocrysts in the two contrast Mesozoic granitic rockseries, binary mica-adamellite-granite series(S--type)and diorite-porphyriticgranodiorite-porphyritic granite series(I-type), of the area are very similarin many aspects. The phenocrysts are of large size, euhedral shape, and carlsbadtwin. The plagioclase and biotite inclusions in phenocrysts aligne paralleled withgrowth face of phenocrysts. Generally, the cores of phenocrysts are rich in plagi-oclase inclusions, but the quartz inclusions...
The alkali-feldspar phenocrysts in the two contrast Mesozoic granitic rockseries, binary mica-adamellite-granite series(S--type)and diorite-porphyriticgranodiorite-porphyritic granite series(I-type), of the area are very similarin many aspects. The phenocrysts are of large size, euhedral shape, and carlsbadtwin. The plagioclase and biotite inclusions in phenocrysts aligne paralleled withgrowth face of phenocrysts. Generally, the cores of phenocrysts are rich in plagi-oclase inclusions, but the quartz inclusions only occurred in the rim. The Ab, An,Ba contents in phenocrysts are higher than in groudmass alkalifeldspars. Theforming temperature of the phenocrysts calculated from two-feldspar geothermo-meter of Whithey and Stormer(1977)are round 700℃, the X-rays reflectionsshow that most phenocrysts are intermediate orthoclase, the other a few areorthoclase and microcline. A1l the features above convince that the phenocrystsare crystalized from magma. Based on experimental data, the work also discu-ssed the crystalizing processes of the phenocrysts and it is considered that cry-stalized alkali-feldspar phenocrysts represent high water bontent of graniticmagma,
Two groups of feldspars——alkali feldspars and plagioclases, occur in six alkaline rockbodies of eastern China. The first group consisting of orthoclase, microcline and albite is dominant in all six rockbodies, while the second composed of andesine and oligoclase is only recognized in some of the rockbodies. There are three associations of feldspars, i. e., orthoclase-plagioclase, orthoclasemicrocline and albite-microcline making up perthite. In each of the associations feldspars exhibit some similarities in...
Two groups of feldspars——alkali feldspars and plagioclases, occur in six alkaline rockbodies of eastern China. The first group consisting of orthoclase, microcline and albite is dominant in all six rockbodies, while the second composed of andesine and oligoclase is only recognized in some of the rockbodies. There are three associations of feldspars, i. e., orthoclase-plagioclase, orthoclasemicrocline and albite-microcline making up perthite. In each of the associations feldspars exhibit some similarities in composition or structure and the same compositional evolution trend of feldspars can be observed in some rockbodies. Based on the data on the structure state of feldspars and two-feldspar or feldspar-nepheline geothermometry, the forming temperatures of these rockbodies have been estimated.
The Hercynian to Indosinian Darongshan granite belt is a typical example of peraluminous granites in South China. It is mainly composed of coarse-or intermediate-grained cordierite-biotite monzonitic granite(Darongshan body), intermediateor fine-grained porphyroid garnet-cordierite-biotite monzonitic granite (Jiuzhou body), and hypersthene granite porphyry with fine- or intermediate-grained phenocrysts (Taima body). In this paper, the relationship of magma crystallization temperatures of the three bodies is...
The Hercynian to Indosinian Darongshan granite belt is a typical example of peraluminous granites in South China. It is mainly composed of coarse-or intermediate-grained cordierite-biotite monzonitic granite(Darongshan body), intermediateor fine-grained porphyroid garnet-cordierite-biotite monzonitic granite (Jiuzhou body), and hypersthene granite porphyry with fine- or intermediate-grained phenocrysts (Taima body). In this paper, the relationship of magma crystallization temperatures of the three bodies is discussed based on Al-Si order-disorder and cell parameters of feldspars, and the composition of biotites. P, T, f_(O2) and f_(H2O) for each granite body when the magma emplaced and crystallized are evaluated by means of estimating the thickness of the overlying strata, two-fieldspar geothermometer, homogenization temperaure of fluid inclusions in quartz, and biotite fugacity indicator. The results show that, for Darongshan body, the magma emplaced at a depth of 14～18.7km, crystallized at T=627～700℃, fo2 =5 10~(-16) bar and f_(H2O)=3.1kbar; for Jiuzhou body, the magma emplaced at a depth of 10～12km, crystallized at T=750-764℃, f_(O2)=10~(-14) bar and f_(H2O)=2.3kbar; for Taima body, the magma croplaced at 1.5～2.4km, crystallized at T=780～862℃, f_(O2) and f_(H2O) when biotite crystallized were 10~(-18) bar and 2.1kbar respectively.
二长石
two-feldspar
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