نتایج جستجو برای: clinopyroxene
تعداد نتایج: 784 فیلتر نتایج به سال:
We present new laser ablation ICP-MS trace element concentration data for 28 elements in 97 mid-ocean ridge basalt (MORB) glasses that cover all major spreading centers as well as Tl concentration data for all mineral phases in five lherzolites from the Lherz massif, France. The ratio between the elements thallium (Tl) and cerium (Ce) is nearly constant in MORB, providing evidence that the depl...
Zoned, silica-deficient, calcic garnets containing up to 5 mol% F substitution for 0 formed during contact metamorphism of basalts by the Skaergaard intrusion in East Greenland. Fluorian calcic garnets occur as a retrograde alteration of prograde wollastonite and clinopyroxene that fills vesicles and vugs in lavas 30-70 m from the intrusion. Paragenetically equivalent phases include fluorite, w...
Clinopyroxene Intermediate between Jadeite and Aegirine from Suberi-dani, Tokusima Prefecture, Japan
MPET4: a computer program for coexisting garnet clinopyroxene-plagioclase-quartz geothermobarometry
1- Introduction The studied area is situated in northeast Varzeghan in East Azerbaijan Province. In the classification of the structural unites of Iran, this area is a part of Ahar-Arasbaran magmatic arc. The Cenozoic magmatism in the Ahar–Arasbaran region started in the Eocene with an intensive volcanic activity that produced widespread basic to felsic rocks and continued in the Oligo-Miocene...
There are numerous outcrops of lamprophyric rocks, as sill and dikes, in the northwestern part of Iran. These rocks can be classified in two mica- and amphibole-rich types. Amphibole-rich type includes amphibole, olivine psudomorphs, and clinopyroxene phenocrysts in the matrix of feldspar and altered glass. Mica-rich lamprophyres include mica and clinopyroxene phenocrysts in the matrix of felds...
Basaltic volcanic rocks with pillow structures are exposed at the southeasternmost extremity of the Sanandaj-Sirjan zone.They belong to volcanic-sedimentary complexes that formed in a general northwest-southeast to north-south trend. In this research, the mineral chemistry of clinopyroxene and plagioclases are employed to study physicochemical conditions and paleo-tectonic setting during genera...
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