11. MYRMEKITE IN GARNET-SILLIMANITE- CORDIERITE GNEISSES AND Al-Ti-Zr TRENDS, GOLD BUTTE, NEVADA
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Four generations of accessory-phase growth in low-pressure migmatites from SW NewHampshire
Mineral compositions and reaction textures found in migmatitic gneisses from near Gilsum, New Hampshire, constrain both peak metamorphic pressure (P) and temperature (T) conditions and the PT path. Large K-feldspar porphyroblasts indicate isobaric heating of the samples at P < 4 kb (Spear et al. 1999), and relict cordierite + garnet assemblages record the occurrence of biotite vapor-absent melt...
متن کاملکانیشناسی، زمینشیمی و دما- فشار سنجی گارنت آمفیبولیتهای مجموعه دگرگونی دلبر، بیارجمند (جنوب شرق شاهرود)
Delbar metamorphic complex is located in 130 Km south of Shahrood (Biarjmand area) in Northern margin of the central Iran zone. The varied metamorphic rocks including meta-psammite, meta-greywacke, meta-pelite, marble and amphibolite and mylonitized granites and leucogranites intrusions are exposed in this complex. The field and petrography evidences indicated the evolutions resulted of the inc...
متن کاملکانیشناسی و شناخت پروتولیت گنایسهای شمال دریاچهی سد زایندهرود، شمال شهرکرد (پهنهی سنندج – سیرجان)
Gneisses of the northern part of the Zayandehrood Dam Lake, structurally, are located in the Sanandaj-Sirjan zone. The gneises with phengitic marble and metabasic bodies comprise a part of high-pressure units in the North Shahrekord metamorphic complex. Minerlogically, the rocks consist of quartz, garnet, phengite, k-feldspar, albite, tourmaline and rutile with zircon grains. Field (alternation...
متن کاملMetamorphic P–T conditions and thermal structure of Chinese Continental Scientific Drilling main hole eclogites: Fe–Mg partitioning thermometer vs. Zr-in-rutile thermometer
Core rocks recovered from the main hole (5158 m deep) of the Chinese Continental Scientific Drilling (CCSD-MH) project, southern Sulu UHP terrane, east-central China, consist of eclogites, various gneisses and minor metaperidotite cumulates; this lithological section underwent subduction-zone UHP metamorphism. Coesite-bearing eclogites are mainly present between the depths of 100–2000 m, but be...
متن کاملThe gedrite-anthophyllite solvus and the composition limits of orthoamphibote
Coexisting orthoalnphiboles (high Al-Na gedrites and low Al-Na anthophyllites) from the Post Pond Volcanics, Vermont, display a variety of textures that are interpreted to be equilibrium growth textures. These textures include: (l) discrete grains; (2) bladed intergrowths; (3) patchy intergrowths; (4) overgrofihs; and (5) lamellar intergrowths with lamellae parallel to (120). Coexisting orthoam...
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تاریخ انتشار 2012