LOW-TEMPERATURE MICRODIAMOND AGGREGATES IN THE MAKSYUTOV METAMORPHIC COMPLEX, SOUTH URAL MOUNTAINS, RUSSIA
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dc.contributor.author | Bostick B.C. | |
dc.contributor.author | Jones R.E. | |
dc.contributor.author | Ernst W.G. | |
dc.contributor.author | Chen C. | |
dc.contributor.author | Leech M.L. | |
dc.contributor.author | Beane R.J. | |
dc.date.accessioned | 2021-12-02T03:58:07Z | |
dc.date.available | 2021-12-02T03:58:07Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14428073 | |
dc.identifier.citation | American Mineralogist, 2003, 88, 11-12 Part 1, 1709-1717 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32625 | |
dc.description.abstract | The Middle Paleozoic Maksyutov Complex is an important component of the Eurasian collisional orogeny. It consists of dominant mica-rich garnet schist and mica-poor quartzofeldspathic gneiss enclosing minor mafic eclogite boudins (unit no. 1). Employing Raman spectroscopy, we identified three cuboidal microdiamond inclusions (∼2-3 micrometers in diameter) in garnet hosts from two different mica-poor gneissic samples. Broad spectral bands and high magnification SEM images suggest that the cuboids are fine-grained nanocrystalline diamond aggregates characterized by limited long-range ordering. Their poor crystallinity is compatible with relatively low-temperature, solid-state growth in the absence of both melt and a C-O-H-N fluid. Poor crystallinity, and small grain size suggest that such aggregates may represent the lowest temperature microdiamonds yet identified in nature. Their formation required ultrahigh-pressures (UHP) at a minimum of 3.2 GPa, and a metamorphic temperature of ∼650 °C. Blocky graphite up to 10+ mm across in the matrix of mica-rich carbonaceous garnet schist may represent pseudomorphs after much larger neoblastic diamonds. Thermobarometric calculations for analyzed coexisting garnet + omphacite + phengite from six Maksyutov unit no. 1 mafic eclogites indicate retrograde physical conditions of 610-680 °C, 1.7-2.6 GPa, slightly lower-pressure conditions than the coesite stability field. Complete conversion of diamond to blocky graphite in the mica-rich schists, and recrystallization of coesite to quartz in the schists, quartzofeldspathic gneisses, and eclogite pods reflect relatively slow exhumation from ∼110 km depth to upper crustal levels over 60-90 m.y. Phengite inclusions in zircon and garnet hint at modest activity of H2O during prograde UHP metamorphism of the eclogites and mica-poor gneisses. The latter have retained rare, tiny microdiamond inclusions in garnet on decompression. Abundant white mica in the carbonaceous garnet schists probably reflects a C-O-H-N fluid-mediated, kinetically enhanced prograde production of diamond, and efficient obliteration of this phase accompanying leisurely ascent of the subduction complex. In contrast, associated mica-poor gneisses and eclogites were relatively dry during exhumation, so retained rare nanocrystalline microdiamond inclusions in garnet. | |
dc.subject | Paleozoic | |
dc.title | LOW-TEMPERATURE MICRODIAMOND AGGREGATES IN THE MAKSYUTOV METAMORPHIC COMPLEX, SOUTH URAL MOUNTAINS, RUSSIA | |
dc.type | Статья | |
dc.subject.age | Paleozoic | |
dc.subject.age | Палеозой | ru |
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