An Experimentally Constrained Petrogenetic Grid in the Silica-Saturated Portion of the System KFMASH at High Temperatures and Pressures |
| |
Authors: | DAS, KAUSHIK DASGUPTA, SOMNATH MIURA, HIROYUKI |
| |
Affiliation: | 1 DIVISION OF EARTH AND PLANETARY SCIENCES, GRADUATE SCHOOL OF SCIENCE, HOKKAIDO UNIVERSITY, N10W8, KITA-KU, SAPPORO-SHI, JAPAN, 060-0810 2 DEPARTMENT OF GEOLOGICAL SCIENCES, JADAVPUR UNIVERSITY, KOLKATA, INDIA |
| |
Abstract: | Experiments in the quartz-saturated part of the system KFMASHunder fO2 conditions of the haematitemagnetite bufferand using bulk compositions with XMg of 0·81, 0·72,0·53 define the stability limits of several mineral assemblageswithin the PT field 912 kbar, 8501100°C.The stability limits of the mineral assemblages orthopyroxene+ spinel + cordierite ± sapphirine, orthopyroxene + garnet+ sapphirine, sapphirine + cordierite + orthopyroxene and garnet+ orthopyroxene + spinel have been delineated on the basis ofPT and TX pseudosections. Sapphirine did not appearin the bulk composition of XMg = 0·53. A partial petrogeneticgrid applicable to high MgAl granulites metamorphosedat high fO2, developed in our earlier work, was extended tohigher pressures. The experimental results were successfullyapplied to several high-grade terranes to estimate PTconditions and retrograde PT trajectories. KEY WORDS: KFMASH equilibria; experimental petrogenetic grid at high fO2 |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|