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- W261815800 abstract "The Cannington Ag-Pb-Zn deposit, northwest Queensland, Australia developed around the host rocks composing banded and migmatitic gneisses, sillimanite-garnet schist and amphibolite. Three crystal habits of sillimanite, gahnite (Zn-spinel) and garnet porphyroblasts occurred on the host rocks of the Cannington deposit could be used to delineate metamorphism that closely associated with Zn-mineralization in the deposit. Linkages the metamorphism to Zinc-mineralization is determined in four chemical systems, KFMASH (KO-FeO-MgO-AlO-SiO-), KFMASHTO (KO-FeO-MgO-AlO-SiO--TiO-FeO), NCKFMASH (NaO-CaO-KO-FeO-MgO-AlO-SiO-) and MnNCK-FMASH (MnO-NaO-CaO-KO-FeO-MgO-AlO-SiO-), using THERMOCALC program (version 3.1; Powell and Holland 1988). Partial melting in MnNCKFMASH and NCKFMASH systems occurs at lower temperature than in the KFMASH and KFMASHTO systems. The partial melting temperature decreases with increasing of Na/(Na+Ca+K) of the bulk rock compositions in the MnNCKFMASH system. The host rocks have melted ca 15 vol.% in the MnNCKFMASH system at peak metamorphic conditions (63462 and 4.81.3 kbar), but partial melting have not occurred in KFMASHTO system. Based on calculations of sillimanite isograd in different systems and sillimanite modal pro-portion, prismatic and rhombic sillimanite and gahnite porphyroblasts including prismatic sillimanite inclusion probably have resulted from pressure and temperature increasing through partial melting (from 550～, 2.0～3.0 kbar to 700～75, 5.0～7.0 kbar), furthermore have experienced N-S then W-E crustal shortening during D and D deformation. Consequently, Zinc mineralization related to gahnite growth occurred during D and was redistributed and upgraded by partial melting and retrograde metamorphism into structural and rheological sites during shearing in D." @default.
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- W261815800 date "2004-12-01" @default.
- W261815800 modified "2023-09-23" @default.
- W261815800 title "호주 퀸즈랜드 주 캔닝턴 광상 모암의 아연-첨정석-규선석-석류석에 관한 연구:변성작용과 아연-광화작용에 대해서" @default.
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