A hornblende-actinolite-cummingtonite composite grain from a quartz diorite porphyry in northeastern Shikoku.

Coexisting hornblende and cummingtonite from the Khetri copper belt, Rajasthan, India

Coexisting hornblende and cummingtonite in an amphibolite near Peliwali have been analysed. The rock formed by Fe-Mg addition and Ca removal from pre-existing amphibole quartzites within the altered wall rocks surrounding sulphide lodes. The amphibole compositions are controlled by the bulk composition of the rock. The Mg/(Mg+Fe 2+) ratio of the hornblende (o.66) is only slightly higher than th...

بررسی‌های دورسنجی، زمین‌شناسی، دگرسانی، کانی‌سازی و ژئوشیمیایی در گستره‌ی پی‌جوئی مس- طلا بالازرد، غرب نهبندان

Balazard area is located in west of Nehbandan in the center of Lut Block. Eocene andesite and rhyolite cover most of the area. Subvolcanic rocks such as quartz monzodiorite porphyry, biotite quartz diorite porphyry, pyroxene hornblende diorite porphyry, hornblende pyroxene quartz diorite porphyry and hornblende diorite porphyry intruded the volcanic rocks. Evidence such as disseminated sulfide ...

کاربرد شیمی کانی‌های آمفیبول و فلدسپار در بررسی پتروژنتیک مجموعه‌ی گرانیتوئیدی میوسن میانی، غرب کاشان

The Middle Miocene Niyasar granitoid complex is located in west of Kashan and in the Urumieh – Dokhtar magmatic belt. Based on petrographic studies, the Niyasar complex is composed of tonalite, quartz-diorite and diorite intrusive rocks. These rocks are mainly composed of quartz, plagioclase, amphibole, biotite and K-feldspar. The amphiboles belonge to calcic group and vary in composiotion from...

Conjugate cummingtonite and hornblende at Sgeir nan Sgarbh, South Harris, Outer Hebrides

شیمی برخی از کانی‌ها و ارزیابی دما و فشار در توده گرانیتوئیدی کوه دم، شمال شرق اردستان

Kuh e-Dom intrusion, located at the northeast of Ardestan, consists of granodiorite and diorite. The granodiorites have been intruded by various basic dikes. Plutonic rocks are mainly composed of plagioclase, biotite, amphibole, pyroxene, alkali-feldspar and quartz. Based on microprobe analysis, the biotite is classified as magnesiobiotites which typically occur at calc-alkaline orogenic igneou...