Carbonic fluid inclusions in ultrahigh-temperature granulite from Kumiloothu in the northern Madurai Block, southern India
TL;DR: In this paper, fluid inclusion data on UHT granulites from Kumiloothu in the northern Madurai Block situated along the Palghat-Cauvery Shear Zone system in southern India was reported.
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Abstract: We report fluid inclusion data on ultrahigh-temperature (UHT) granulites from Kumiloothu in the northern Madurai Block situated along the Palghat-Cauvery Shear Zone system in southern India. Three categories of fluid inclusions have been observed: primary inclusions in garnet comprising the dominant category, secondary inclusions in garnet, and rare primary inclusions in rutile and apatite enclosed within garnet. The melting temperatures of all the categories of inclusions lie in the narrow range of −57.0 to −56.6 °C, close to the triple point of pure CO2. Most of the fluid inclusions homogenize into the liquid phase between a temperature range of +11.3 to +30.3 °C, corresponding to low-CO2 densities of 0.59-0.85 g/cm3. Slightly higher density of 0.95 g/cm3 was obtained from a primary inclusion in rutile that homogenized at −3.6 °C. The fluid densities, when computed into isochores, indicate lower pressures (∼ 6.6 kbar at 1000 °C) than the peak P-T conditions (T >1000 °C at ∼ 8 kbar) estimated for this region. The results of this study, together with the primary nature of the inclusions trapped in high-grade minerals, indicates density reversal of peak metamorphic fluid, a common feature for many UHT granulites along the Gondwana suture zone as well as other UHT terranes showing clockwise P-T history.
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Citations
High P-T phase relation of magnesian (Mg0.7Fe0.3) staurolite compositon in the system FeO-MgO-Al2O3-SiO2-H2O: Implications for prograde high-pressure history of ultrahigh-temperature metamorphic rocks
TL;DR: In this paper, the lower-pressure stability limit of staurolite was investigated at 12-19 kbar and 850-1050 °C, with a focus on the lower pressure stability limit.
15
Low-density CO2-rich fluid inclusions from charnockites of southwestern Madurai Granulite Block, southern India; implications on graphite mineralization
TL;DR: In this paper, the formation and break-down of graphite during high-grade metamorphism was investigated in graphite-bearing charnockites from the southwestern part of the Madurai Granulite Block in southern India.
10
Fluid-induced high-temperature metasomatism at Rundvågshetta in the Lützow-Holm Complex, East Antarctica: Implications for the role of brine during granulite formation
Kazuki Takahashi,Toshiaki Tsunogae,Toshiaki Tsunogae,Emmanuel Nwachukwu Ugwuonah,Emmanuel Nwachukwu Ugwuonah +4 more
TL;DR: In this paper, a petrological, phase equilibria modeling, and fluid inclusion data for pelitic and mafic granulites from Rundvagshetta in the highest-grade region of the Neoproterozoic Lutzow-Holm Complex (LHC), East Antarctica, and provide unequivocal evidence for fluid-rock interaction and high temperature metasomatism in the presence of brine fluid.
9
Primary CO2-bearing fluid inclusions in granulitic garnet usually do not survive
Bruna Borges Carvalho,Omar Bartoli,Bernardo Cesare,Tommaso Tacchetto,Omar Gianola,Fabio Ferri,László Előd Aradi,Csaba Szabó +7 more
TL;DR: In this paper, the authors investigate three world-renowned high-to ultra-high temperature metamorphic terranes to evaluate the fate of primary CO2 and COH fluid inclusions certainly trapped during the prograde path.
Subduction-accretion-collision history along the Gondwana suture in southern India: A laser ablation ICP-MS study of zircon chronology
TL;DR: This paper reported the petrological characteristics and preliminary zircon geochronology based on laser ablation ICP mass spectrometry of the various units in an accretionary belt within the Palghat-Cauvery Shear/Suture Zone in southern India, a trace of the Cambrian Gondwana suture.
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Simon L. Harley,David H. Green +1 more
TL;DR: An experimentally calibrated geobarometer based on the solubility of alumina in orthopyroxene coexisting with garnet is presented in this article, which is based on experiments in the FeO-MgO-Al2O3-SiO2 systems performed at high temperatures and pressures (800-1,200 °C and 5-20 kbar).
288
Passage through India: the Mozambique Ocean suture, high-pressure granulites and the Palghat-Cauvery shear zone system
Abstract: The Mozambique Ocean closed as Gondwana formed. Its suture has been identified in Madagascar (Betsimisaraka suture), but its continuation, into India, is controversial. The Palghat-Cauvery shear system appears an ideal candidate as it: (i) lies along strike of the Betsimisaraka suture in Gondwana; (ii) forms a high-pressure granulite belt; and (iii) separates crustal domains with different geological histories. However, existing age constraints have been used to suggest that the structure is Archaean/Palaeoproterozoic. Here we date metamorphic zircons using secondary ion mass spectrometry (535.0 ± 4.9 Ma) and monazites using electron probe micro-analysis (537 ± 9, 532 ± 8, 525 ± 10 Ma). No evidence for an earlier metamorphic event was found. The identification of Palghat-Cauvery high-pressure metamorphism as Cambrian, and recognition that it bounds crustal domains of contrasting origin, points to it being the southern continuation of the Betsimisaraka suture and southern margin of Neoproterozoic India.
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