myrmekite वाक्य
उदाहरण वाक्य
मोबाइल
- Myrmekite is a globular or bulbous symplectite of quartz in plagioclase.
- If only Na is present then no myrmekite will form.
- These investigations and the field relationships convinced him of the entirely different origin of myrmekite from that generally believed by most geologists.
- Since 1972, Collins has been working on the enigmatic mineral intergrowth myrmekite, which led to discoveries in the field of petrology.
- Gradations occur from rocks containing exclusively rim myrmekite to those containing both rim myrmekite and wartlike myrmekite and finally to those containing exclusively wartlike myrmekite.
- Gradations occur from rocks containing exclusively rim myrmekite to those containing both rim myrmekite and wartlike myrmekite and finally to those containing exclusively wartlike myrmekite.
- Gradations occur from rocks containing exclusively rim myrmekite to those containing both rim myrmekite and wartlike myrmekite and finally to those containing exclusively wartlike myrmekite.
- Gradations occur from rocks containing exclusively rim myrmekite to those containing both rim myrmekite and wartlike myrmekite and finally to those containing exclusively wartlike myrmekite.
- The occasional appearance of myrmekite ( mainly in the microgranites ) and the hematitization of the plagioclase in the aplites and in the red facies rocks points to metasomatic processes.
- For this process to operate it is important that Ca is sufficiently present so that a fairly calcic plagioclase can be formed which in turn releases enough silica for the myrmekite vermicules.
- The texture should not be confused with myrmekite or granophyre, in which quartz forms club-shaped, curved or vermiform threads intergrown with plagioclase feldspar and alkali feldspar, respectively.
- His extensive studies by thin sections, cathodoluminescence, electron microprobe and scanning-electron images supported an entirely different model in which K-metasomatism of primary plagioclase produced the myrmekite.
- The myrmekite does not show wartlike tapering vermicules, but vermicules that are nearly constant in size because the host plagioclase containing the quartz vermicules has nearly a constant Na / Ca composition.
- Yet Lorence G . Collins does not agree with the assumption of the K-feldspar being primary magmatic and the myrmekite being formed due to deformation-induced Na-Ca-metasomatism.
- This leads via the replacement of primary K-feldspar ( perthitic and non-perthitic microcline ) to the formation of plagioclase ( albite or oligoclase ) and in certain places also to the formation of myrmekite.
- Thus, the combination of myrmekite and Po-halos ( neither of which can form from a granite magma ) becomes a strong indicator that not all granite bodies of large size need be formed from magma.
- Myrmekite is a microscopic, vermicular ( worm-like ) intergrowth of quartz and sodium-rich plagioclase common in granite; myrmekite may form as alkali feldspar breaks down by exsolution and silicon is transported by fluids in cooling rocks.
- Myrmekite is a microscopic, vermicular ( worm-like ) intergrowth of quartz and sodium-rich plagioclase common in granite; myrmekite may form as alkali feldspar breaks down by exsolution and silicon is transported by fluids in cooling rocks.
- On his website he so far has authored and co-authored more than 50 scientific articles . ( See external links at end of article . ) His latest article on this website summarizes his research on the origin of myrmekite and metasomatic granite.
- There he came upon the mineral intergrowth called myrmekite where its origin did not fit the usually accepted models as to either being formed by exsolution from primary K-feldspar or by Na-and Ca-metasomatism along the margins of primary K-feldspar.
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