Amphibole lamellae formation in the upper mantle due to interaction of fluid inclusions and host minerals: a case study from Persani Mountains Volcanic Field, Transylvania

Amphibole is one of the most abundant &#8217;water&#8217;-bearing minerals in the Earth&#8217;s upper mantle. Amphiboles occur as interstitial grains, lamellae within pyroxenes or as daughter minerals within fluid inclusions. &#160;Most commonly amphibole formation is related to mantle metasomatism, where the agent has a subducted slab (e.g. Manning 2004) or an asthenospheric origin (e.g. Berkesi et al. 2019). &#160;After the formation of fluid inclusions, a subsolidus interaction can take place where the H2O content of fluid inclusions may crystallize pargasite (e.g. Plank et al. 2016).Here we present amphibole lamellae formation in mantle xenoliths from the Persani Mountains Volcanic Field that is interrelated to a reaction between fluid inclusions and host clinopyroxene. &#160;Newly formed amphibole lamellae occur only in the surroundings of the fluid inclusions and grow within the host clinopyroxene in a preferred crystallographic direction. &#160;Studied lamellae do not reach the rim of the host mineral implying that components needed for formation of amphibole lamellae in clinopyroxene could have only originated from the fluid inclusion itself. &#160;We measured the major element composition of amphibole lamellae and host clinopyroxene (1) and used Raman spectroscopy and FIB-SEM on fluid inclusion study situated next to the lamellae (2). &#160;Results support the hypothesis that chemical components (dominantly H+) migrated sub-solidus from the fluid inclusion into the host mineral after fluid entrapment via subsolidus interaction. &#160;Beyond the clinopyroxene-hosted fluid inclusions, fluid inclusions in orthopyroxenes were also studied as a reference. &#160;Our study shows that post-entrapment diffusion from a fluid inclusion into the host mineral changes the solid/fluid ratio of the mantle &#160;which could modify the rheology of the lithospheric mantle.Berkesi, M. et al. 2019. Chemical Geology, 508, 182-196.Kov&#225;cs et al. (2017) Acta Geodaetica et Geophysica, 52(2), 183-204.Manning C. E. 2004. Earth and Planetary Science Letters, 223, 1-16.Plank, T. A. et al. 2016. In AGU Fall Meeting Abstracts.

Download Full-text

Fluid inclusions in upper mantle xenoliths from Northern Patagonia, Argentina: Evidence for an upper mantle diapir

Mineralogy and Petrology ◽

10.1007/bf01173707 ◽

1997 ◽

Vol 60 (3-4) ◽

pp. 145-164 ◽

Cited By ~ 7

Author(s):

M. E. Varela ◽

E. A. Bjerg ◽

R. Clocchiatti ◽

C. H. Labudia ◽

G. Kurat

Keyword(s):

Fluid Inclusions ◽

Upper Mantle ◽

Mantle Xenoliths ◽

Northern Patagonia ◽

Mantle Diapir

Download Full-text

Seismic anisotropy under extended crust: evidence from upper mantle xenoliths, Cima Volcanic Field, California

Tectonophysics ◽

10.1016/s0040-1951(00)00070-6 ◽

2000 ◽

Vol 321 (3) ◽

pp. 279-296 ◽

Cited By ~ 17

Author(s):

B. Soedjatmiko ◽

N.I. Christensen

Keyword(s):

Upper Mantle ◽

Seismic Anisotropy ◽

Volcanic Field ◽

Mantle Xenoliths ◽

Cima Volcanic Field

Download Full-text

Geochemical Data and Fluid Inclusion Study of the Middle Miocene Halite from Deep Borehole Huwniki-1, Situated in the Inner Zone of the Carpathian Foredeep in Poland

Minerals ◽

10.3390/min10121113 ◽

2020 ◽

Vol 10 (12) ◽

pp. 1113

Author(s):

Krzysztof Bukowski ◽

Anatoliy Galamay ◽

Piotr Krzywiec ◽

Andrzej Maksym

Keyword(s):

Fluid Inclusion ◽

Fluid Inclusions ◽

Fluid Inclusion Study ◽

Geochemical Data ◽

Sulfate Ions ◽

Deep Well ◽

Evolutionary Changes ◽

Orogenic Wedge ◽

Inclusion Study ◽

Salinity Water

The geochemical data and the study of fluid inclusions in primary halite are invaluable sources of saline basin information. Most of the previous analyses of salt from the Carpathian area have been obtained by studying the halite samples collected from depths not exceeding 1000 m (i.e., from salt mine outcrops or boreholes). In this article, for the first time, we present the results of samples obtained from a deep well where salt occurs below the frontal orogenic wedge at a depth of ~5000 m. The salt core’s petrological studies showed, quite unexpectedly, the presence of the chevron relics, typical for primary halite. Their geochemical data and fluid inclusion study can be used to reconstruct the environment of the salt sedimentation. The bromine, strontium, and rubidium content values indicated that primary brines were of marine origin, and salts may have undergone partial dissolution and redeposition under lower salinity water inflows. The main ions’ (K, Mg, SO4) ratios in the fluid inclusions were typical for those of the Badenian brines collected from the Carpathian Foredeep’s eastern part. Compared with modern seawater’s chemical composition, this brine contained a slightly lower content of sulfate ions. This was associated with evolutionary changes occurring in the contents of sulfate ions during the Cenozoic.

Download Full-text

Characteristics and applications of fluid inclusions in the Eogene system of the Biyang Depression—I. a fluid inclusion study

Chinese Journal of Geochemistry ◽

10.1007/bf02869068 ◽

1992 ◽

Vol 11 (4) ◽

pp. 370-383 ◽

Cited By ~ 3

Author(s):

Bixian Mai ◽

Benshan Wang

Keyword(s):

Fluid Inclusion ◽

Fluid Inclusions ◽

Fluid Inclusion Study ◽

Inclusion Study ◽

Biyang Depression

Download Full-text

First assessment of the noble gas and CO2 isotopic composition of fluid inclusions hosted in mantle xenoliths from El Hierro (Canary Islands)

10.5194/egusphere-egu21-12817 ◽

2021 ◽

Author(s):

Andres Sandoval Velasquez ◽

Andrea Luca Rizzo ◽

Alessandro Aiuppa ◽

Maria Luce Frezzotti ◽

Samantha Remigi ◽

...

Keyword(s):

Isotopic Composition ◽

Oceanic Crust ◽

Canary Islands ◽

Fluid Inclusions ◽

Upper Mantle ◽

Noble Gas ◽

Mantle Metasomatism ◽

Mantle Xenoliths ◽

Local Source ◽

El Hierro

Studying the isotopic composition of fluids trapped in mantle xenoliths opens avenues to understanding the origin and cycling of volatiles in the Earth&#8217;s upper mantle. Here, we present the first isotopic results for noble gases and CO2 in fluid inclusions (FI) trapped in mantle xenoliths from El Hierro the youngest island of the Canarian archipelago. Our results are based on 6 mantle xenolith samples (3 Spinel-lherzolites and 3 Spinel-harzburgites) collected from the El Julan cliff valley (Oglialoro et al., 2017), from which we hand-picked crystals of Ol, Opx, and Cpx. Isotopic determinations were performed at the INGV (Sezione di Palermo) noble gas and stable isotopes laboratories, following the preparation methods and analytical procedures described in Rizzo et al. (2018 and references therein).The Ne-Ar isotopic compositions reveal the presence of an atmospheric component in the FI. Most of the samples exhibit 4He/20Ne ratios > 60, 20Ne/22Ne ratios between 9.84 and 10.49, 21Ne/22Ne ratios from 0.0295 to 0.0330, and 40Ar/36Ar > 800, suggesting mixing between MORB-like mantle fluids and an air-derived component. We argue this latter may (at least in part) derive from upper mantle recycling of atmospheric fluids via paleo-subduction event(s). Excluding samples possibly affected by diffusive fractionation processes, the average Rc/Ra ratio (3He/4He ratio corrected for atmospheric contamination) measured in El Hierro xenoliths is ~7.45 + 0.26 Ra, within the MORB range (8 + 1 Ra; Graham, 2002). The He homogeneous signature of these xenoliths agrees well with the 3He/4He compositions previously reported in lava phenocrysts and cumulates (Day and Hilton, 2011) and is slightly below the maximum ratios measured in groundwater samples during the 2012 volcanic unrest (~8.2 Ra; Padron et al., 2013). All these pieces of evidence argue against a primordial source involved in the local lithospheric mantle. Putting these data in the context of previous literature results for FI and surface gases in the Canary Islands (La Palma, La Gomera, Tenerife, Gran Canaria, and Lanzarote), we identify an eastward 3He/4He decreasing trend that parallels a corresponding increase of the oceanic crust thickness. In addition to the mantle heterogeneity, we propose that part of the 3He/4He east-to-west variation along the archipelago is caused by the variable thickness of the oceanic crust (and hence, different interactions with 4He-rich crustal fluids during emplacement).The FI &#948;13C(CO2) isotopic composition ranges from -2.38 to -1.23&#8240; in pyroxenes and -0.2 to +2.0&#8240; in olivine. These unusually positive &#948;13C compositions support the existence of a recycled crustal carbon component in the local source mantle, likely pointing to mantle metasomatism (Oglialoro et al., 2017) from fluids carrying carbon from subducted sediments and/or altered oceanic crust (AOC).

Download Full-text

Emeralds from the Delbegetey deposit (Kazakhstan): mineralogical characteristics and fluid-inclusion study

Mineralogical Magazine ◽

10.1180/0026461067020321 ◽

2006 ◽

Vol 70 (2) ◽

pp. 159-173 ◽

Cited By ~ 8

Author(s):

E.V. Gavrilenko ◽

B. Calvo Pérez ◽

R. Castroviejo Bolibar ◽

D. García del Amo

Keyword(s):

Fluid Inclusion ◽

Fluid Inclusions ◽

Isotope Composition ◽

Aqueous Fluid ◽

Fluid Inclusion Study ◽

Refractive Indices ◽

Mineralogical Characteristics ◽

Primary Fluid ◽

Inclusion Study ◽

Characteristic Features

AbstractThe aim of this study is to provide the first detailed mineralogical and fluid-inclusion description of emeralds from the Delbegetey deposit (Kazakhstan). The characteristic features of Delbegetey emeralds are established: they have dissolution figures on crystal faces, bluish colour and distinct colour zoning; the refractive indices are ω = 1.566–1.570, ε = 1.558–1.562, and the specific gravity is 2.65±0.005, relatively low for natural emeralds; they have very small concentrations of the impurities (Fe, Mg, Na and others) typical of other emeralds, and contain Cr and V; there is a significant preponderance of vapour in fluid inclusions of all types and there is liquid-to-vapour homogenization of primary fluid inclusions (at 395–420°C). The lattice oxygen isotope composition data obtained (δ18O SMOW value of 11.3%o) situate the deposit within the range characteristic of other granite-related emerald deposits. Emerald crystallization took place in low-density (0.40–0.55 g/cm3) aqueous fluid, with the following chemical composition (mol.%): 75.6-97.4 H2O, 0.0-18.4 CO2, 0.0-0.9 CH4, and 4.06-9.65 wt.% NaCl equiv. salinity. According to the calculated isochores, the pressure of formation of the Delbegetey emeralds can be estimated at 570–1240 bar.

Download Full-text

Fluid-Inclusion Evidence for an Upper-Mantle Origin for Green Clinopyroxenes in Late Cenozoic Basanites from the Nógrád-Gömör Volcanic Field, Northern Hungary/Southern Slovakia

International Geology Review ◽

10.1080/00206819809465237 ◽

1998 ◽

Vol 40 (9) ◽

pp. 765-773 ◽

Cited By ~ 9

Author(s):

Cs. Szabó ◽

R. J. Bodnar

Keyword(s):

Fluid Inclusion ◽

Upper Mantle ◽

Volcanic Field ◽

Late Cenozoic ◽

Mantle Origin

Download Full-text

A fluid inclusion study of an amethyst deposit in the Cretaceous Kyongsang Basin, South Korea

Mineralogical Magazine ◽

10.1180/002646101750377515 ◽

2001 ◽

Vol 65 (4) ◽

pp. 477-487 ◽

Cited By ~ 3

Author(s):

K. H. Yang ◽

S. H. Yun ◽

J. D. Lee

Keyword(s):

Fluid Inclusion ◽

South Korea ◽

Fluid Inclusions ◽

Solidus Temperature ◽

Type Systems ◽

Biotite Granite ◽

Granitic Rocks ◽

Fluid Inclusion Study ◽

Quartz Crystals ◽

Inclusion Study

AbstractThe Eonyang amethyst deposit is thought to be spatially and temporally associated with the biotite granite of the Cretaceous Kyongsang Basin, South Korea. The euhedral quartz crystals in cavities in the aplite which intrudes biotite granite are colour-zoned from white at the base to amethystine at the top. Fluid inclusions from rock-forming quartz in granitic rocks and euhedral quartz crystals in cavities were examined. Three types of primary inclusions were observed and three isochores for inclusions representing each type are constructed to constrain the trapping conditions and fluid evolution involved during the formation of the amethyst. The intersection of the isochore representing the early fluid inclusions with solidus temperature of the host granite indicates initial quartz formation at ~600°C and 1.0–1.5 kbar. Intermediate quartz formation, associated with the high-salinity inclusions, occurred at somewhat lower temperatures (400°C) and pressures of ~1 kbar. The amethystine quartz formed from H2O–CO2–NaCl fluids at temperatures between 280 and 400°C, and pressures of ~1 kbar. Based on the texture and mineralogy of host minerals and on the fluid inclusion characteristics, the euhedral quartz began growing at near solidus conditions of the granite and the pressure did not vary significantly until the end of crystallization of amethystine quartz crystals in cavities. Early quartz in cavities formed from moderately saline fluids that either exsolved from or were in equilibrium with the granite, whereas the amethystine quartz apparently grew from fluids of at least partial sedimentary origin. The granite crystallized at considerable depth under relatively low water pressures probably in the root zones of porphyry-type systems. Hydrothermal activities, fluid compositions and erosion factors combined to provide favourable conditions for the formation of the Eonyang amethyst deposit and its presence near the Earth's surface today.

Download Full-text