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Antigorite from
Hess Deep, East Pacific Rise, Pacific Ocean


Classification
Species:Antigorite
Formula:Mg3(Si2O5)(OH)4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Antigorite data
Locality Data:Click here to view Hess Deep, East Pacific Rise, Pacific Ocean
Data Identifiers
Mindat Occurrence Record ID:1314627
Long-form Identifier:1:3:1314627:8
GUID (UUID V4):72c89d05-f980-4cd4-8131-d6f6884709bc
References
Reference Search (possible matching items)
Journal (article/letter/editorial)
olivine in troctolites and olivine gabbros from the Hess Deep Rift Toshio Nozaka, Robert P. Wintsch, Romain...olivine in troctolites and olivine gabbros from the Hess Deep Rift, LITHOS (2017), doi:10.1016/j.lithos.2016...olivine in troctolites and olivine gabbros from the Hess Deep Rift 1 SC R IP T Toshio Nozaka1*, Robert...gabbroic rocks recovered from IODP Site U1415 at the Hess Deep Rift were examined and compared NU with peridotites...variable degree of serpentinization are essential, and ocean-floor drilling provides an opportunity to observe
Journal (article/letter/editorial)
1007/s00410-019-1595-1 (2019) 174:60 ORIGINAL PAPER Antigorite crystallization during oceanic retrograde serpentinization...serpentine-type antigorite in abyssal-serpentinized peridotite. At mid-ocean spreading ridges, antigorite crystallizes...spectroscopy, we identified antigorite in 49 samples drilled at the Hess Deep (East Pacific Rise) and the Atlantis...the Southwest Indian Ridge (62°–65°E). Overall, antigorite is common, but occurs in limited modal amounts...association with olivine or talc. We explain antigorite crystallization by the interaction with seawater-derived
Journal (article/letter/editorial)
Serpentinite Occurrences in the Oceans: Mantle-Ocean Interactions in the Plate Tectonic Cycle Patricia...Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of...continental rifts open and new ocean basins form. The process of seawater incursion deep into faulted oceanic crust...crust at slow-spreading mid-ocean ridges during periodic amagmatic phases produces bands of serpentinized...supposed. Serpentinite may form at the ends of mid-ocean rift segments as a consequence of low-angle faulting
Journal (article/letter/editorial)
oceanic crust and upper mantle rocks exposed in the Hess Deep near the Galapagos Triple Junction Pierre Agrinier...ridge in the Hess Deep, representing a section of the oceanic crust formed at the East Pacific Ridge 111...high-temperature serpentinization is characteristic of the Hess Deep and cannot be extrapolated to the normal oceanic...segment of the East Pacific Rise CEPR) known as the Hess Deep [ll (Fig. 1). Although the Hess Deep does not...which are -1’ lOid30’ Fig. 1. Location of the Hess Deep samples and the dive tracks. 10V125’ 15' P
Journal (article/letter/editorial)
Transporting Halogens from Earth’s Surface to the Deep Mantle Lilianne PagĂ© * and Keiko Hattori Department...expelled from serpentinites during the lizardite–antigorite transition. Fluorine, on the other hand, appears...to 15% of these elements are also retained in the deep slab. Based on a conservative estimate for serpentinite...thickness of the metamorphosed slab (500 m), antigorite serpentinites comprise 37% of this residual Cl...these elements to the deep mantle. Keywords: serpentinite; halogens; subduction; deep mantle 1. Introduction
Journal (article/letter/editorial)
2003 Polytypes and higher-order structures of antigorite: A TEM study BERNARD GROBÉTY* Institut de MinĂ©ralogie...ABSTRACT The structure of the members of the antigorite polysomatic series is based on corrugated octahedral...the convex side. The half-waves in the basic antigorite structure are characterized by constant medium...are independent of the wavelength. Higher-order antigorite structures based on half-waves with aperture...angles that are a multiple of 20.3∞ are possible. Antigorite aggregates found in ophicarbonates from different
Journal (article/letter/editorial)
serpentinite and loss of residual light Cl back to the ocean. Fluid / rock ratios were probably low as evidenced...sink of exospheric Cl (Sharp and Barnes, 2004). Antigorite is stable to depths of 200 km (Ulmer and Trommsdorff...Cl removal by subduction and addition from mid-ocean ridges and volcanic arcs (e.g., Schilling et al...may control the salinity and d 37Cl value of the ocean (Spivack et al., 2002; Sharp and Barnes, 2004).... Fluids released from the breakdown of antigorite during subduction have been shown to be rich in incompatible
Journal (article/letter/editorial)
due to cooling along with hydration, which gave rise to a compositional variation of Ca-amphibole, from...Seamount with the mid-ocean ridge peridotite from Hess Deep, near the East PaciÂźc Rise (e.g. Arai and Matsukage...serpentine is either chrysotile or lizardite, and antigorite has not been found. Harzburgite is predominant...plan, being 50 km from south to north by 10 km from east to west (Fig. 1). The ÂŻat summit is ~1200 m below...grain size of spinel, with Cr# of 0.5, in the Hess Deep harzburgite and dunite (Fig. 5b). Amphiboles are
Journal (article/letter/editorial)
in lower oceanic crustal troctolites from the Hess Deep Rift Toshio Nozaka1 · Romain Meyer2,4 · Robert...troctolites recovered from IODP Site U1415 at the Hess Deep Rift. The spinel is green-colored, has an irregular...of knowledge, Expedition 345 of the Integrated Ocean Drilling Program (IODP) was designed to drill and...level oceanic crustal rocks formed at the East Pacific Rise (EPR) with the principal objectives to understand...for their formation. Geological setting At the Hess Deep Rift, young plutonic crust formed at the fast-spreading
Journal (article/letter/editorial)
water-soluble fraction average 1.49x (vs. standard mean ocean chlorine, SMOC) from a core at the Iberian Abyssal...Plain, and +0.16x from a much younger core at Hess Deep. The d 37Cl value of insoluble Cl is ~0.33x higher...Introduction The long-term exospheric1 chlorine budget and ocean salinity must be controlled by transfer to and from...chlorine to the crustal reservoir comes from mid-ocean ridges and volcanic centers [2–5] and returns by...carrier of Cl into the deep metamorphic environment and demonstrated that antigorite has high concentrations
Journal (article/letter/editorial)
The Mariana and Izu–Bonin arcs in the western Pacific are characterized by serpentinite seamounts in...separates have a restricted range of ή18O (6.5–8.5‰). Antigorite separates have ήD values of − 29.5‰ to −45.5‰...subduction; stable isotopes; serpentinization; seamounts; Ocean Drilling Program; Site 779; Site 780; Site 784 ...Mariana and Izu–Bonin (MIB) arcs in the western Pacific is the presence of numerous serpentinite seamounts...isotope data for pelagic sediments in the western Pacific in order to help constrain inputs to subduction
Journal (article/letter/editorial)
serpentinite. We estimate that serpentinization at mid ocean ridges is a sink for 0.35–0.64×1011 mol C y−1 and...and chrysotile to antigorite, and formation of minor olivine. Dehydration of antigorite-serpentinites to...they may be signiïŹcant for volatile budgets of the deep Earth. © 2012 Elsevier B.V. All rights reserved...MAR . . . . . . . . . . . . . . . . . . 2.2.5. Hess Deep . . . . . . . . . . . . . . . . . . . . . . ....lizardite and crysotile to antigorite . . . . . . . 5.2. Dehydration of antigorite serpentinites . . . .
Journal (article/letter/editorial)
to metamorphic growth in a matrix composed of antigorite and/or carbonate. Diopsidites have textures reminiscent...setting of the Oman ophiolite is still debated (ocean ridge, (e.g. [20–22]) versus arc-related basin,...where basaltic MORBlike magmas are emplaced on a deep seafloor in an extensional environment. The upper...amount of fibrous hydrous phases (tremolite, antigorite). Spinels are very uncommon and are present only...mm to few tens of cm) zone of antigorite or tremolite. The antigorite itself is replaced by needles of
Journal (article/letter/editorial)
ultramafic rocks and olivine-rich troctolites from the East Taiwan Ophiolite in the Lichi mélange Tomoaki Morishita1...ultramafic and olivine-rich troctolite blocks of the East Taiwan Ophiolite (ETO) in the Lichi Mélange. Although...These compositions are similar to those from mid-ocean ridge peridotites as well as back-arc peridotites...troctolite are also within chemical ranges of mid-ocean ridge samples, and are slightly different from back-arc...and the South China Sea/Eurasian Plates. Keywords East Taiwan Ophiolite · Peridotite · Open-system melting
Journal (article/letter/editorial)
lateral lattice KEYWORDS : serpentinization, antigorite, chrysotile, lizardite, dimensions of the octahedral...High-resolution TEM image of the wavy structure of antigorite along its b-axis. Insert: approximate structure...serpentine minerals are lizardite, chrysotile, and antigorite. Lizardite has a flat crystal structure (FIG...Canada. (D) Tabular, interlocking texture of antigorite (crossed polarizers). Serpentinite from the Piémont...deleterious to human health (Fubini and Fenoglio 2007). Antigorite displays curved, wavy layers similar to Roman
Journal (article/letter/editorial)
were recovered from IODP drilling campaigns of mid-ocean ridge, passive margin and forearc settings (n Œ...serpentinites is lost from chrysotile and/or antigorite and could potentially escape through the forearc...subduction zones in serpentinites is lost during antigorite breakdown and may be cycled through the arc or...km, imply that serpentinites could dominate the deep recycling budgets of both the heavy halogens and...oceanic lithosphere: (i) sediments; (ii) altered ocean crust (e.g. basalts and gabbros), and (iii) serpentinites
Journal (article/letter/editorial)
Όm) awaruite mineralization is associated with antigorite-lizardite-magnetite assemblages that formed at...temperature (<300°C), lizardite-chrysotile-magnetite ± antigorite assemblages in the Wale, Orca, and Letain occurrences...Metamorphic olivine and diopside noted locally in the antigorite-dominant assemblages indicate temperatures reached...heat to produce the pervasive awaruite-bearing antigorite-lizardite-magnetite assemblages. The ferrous...that were discovered and researched through the ocean drilling program (Frost, 1985; Alt and Shanks, 1998;
Journal (article/letter/editorial)
throws. 0 1997 Elsevier ScienCe B.V. Key~vord.st mid-ocean 1. ridges: deformation; serpentinization: lithosphere;...influence af a ductile lower crust on faulting at mid-ocean ridgts (e.g., [7]) has likely been over-emphasized...aware of the importance of serpentinization at mid-ocean ridges [ 14,151. In this paper we: ( 1) discuss...km) is defined by the The range in depth of mid-ocean ridge earthquakes monitored by both teleseismic...serpentinized peridotites drilled at Hess Deep (East Pacific Rise) give setpentinization temperatures
Journal (article/letter/editorial)
of the Franciscan subduction complex, and on the east, across the steep Stony Creek fault, by the JuraCretaceous...radiolarian chert and thin argillite (deep-sea clay?). An open-ocean setting, far from a continent margin...oceanic lithosphere that records only Jurassic open-ocean depositional and tectonic history. It escaped latest...across the CRO and adjacent TCSM/Franciscan Jurassic ocean floor; (3) resumption of eastward subduction in...AND PESSAGNO progressed behind the ridge on the east. The Stony Creek–Beehive Flat composite fault sytem
Report (chapter)
enrichments in spinels from Blue Ridge and modem mid-ocean ridge basalt ultramafic rocks that result from different...subduction may have been west-directed rather than east-directed. The Taconic orogenesis deformed, fragmented...Orogen (Fig. 1) (Pratt & Lewis 1905; Hunter 1941; Hess 1955; Larrabee 1966; Misra & Keller 1978). Such...(amphibolites) are tholeiitic and typically plot in ocean-floor, within-plate, or arc basalt fields on geochemical...the rocks. The features and chemistry of some mid-ocean ridge rocks and their minerals bear some similarities
Journal (article/letter/editorial)
gonized section) and antigorite (modulated structure). For all but antigorite, recent experiments showed...Mid-Atlantic Ridge (MARK area) and the East-Pacific Ridge (Hess-Deep). Thus, they could form during oceanic...oceanic hydrothermal history of the past Pacific oceanic crust. A 3D-network of planar blue- 2. Geological...2.1. Geological setting The subduction of the Pacific plate under the North America margin from late...components. Their subduction to F SA a SYF Pacific Ocean 34°30' SB Blue Canyon 50 km Quaternary Plio-Pleistocene
Journal (article/letter/editorial)
chrysotile range from ±102 to ±77&; high-pressure antigorite in the mylonites and in low strain metaperidotites...±60&, respectively. Comparable ranges occur in antigorite in G. L. FruÈh-Green Institute for Mineralogy...ophicarbonates in ophiolites that have not experienced deep subduction (e.g. Heaton and Sheppard 1977; Sheppard...water during sea¯oor weathering and interaction with deep seawater-derived solutions in hydrothermal systems...lithosphere and represent important water carriers and deep ¯uid reservoirs in subduction zones. During subduction
Journal (article/letter/editorial)
Cretaceous and Paleocene depositional sequences from the deep-water Basque basin, western Pyrenees, Spain V. Pujalte...theoretical studies of the stabilities of talc, antigorite and phase A at high pressures with applications...composition of Klyuchevskoy volcano, Kamchatka and North Pacific sediments: Implications for magma genesis and crustal...oceanic crust and upper mantle rocks exposed in the Hess Deep near the Galapagos Triple Junction P. Agrinier...evidenced by oriented paleomagnetic samples from the ocean floor J.P. Cogne, J. Francheteau, V. Courtillot
Journal (article/letter/editorial)
amphibole; an: anorthite; and: andalusite; atg: antigorite; bio: biotite; br: brucite; Ca-per: Ca-perovskite;...sediments, a layer of igneous rocks having a middle ocean ridge basalt (MORB) bulk composition, and a lower...layer of depleted peridotites. However, modern ocean floors and ophiolites reveal large structural and...igneous, and metamorphic processes occurring at mid-ocean ridges, on the seafloor, and at trenches. 1.1....functions of the sedimentary processes occurring on the ocean floor and in the forearc region as well as functions
Journal (article/letter/editorial)
lizardite -serpentinites, NU antigorite/lizardite- and antigorite-serpentinites. Lizardite-serpentinites...0.84) and lizardite/chrysotile. Antigorite/lizardite- and antigorite-serpentinites record the progressive...recrystallization of mesh and ED bastite textures to antigorite, magnetite and pure Fe-poor brucite (XMg ⁓ 0...showed that the transition from lizardite to antigorite is due to EP T the increase in temperature...slab/mantle interface. Lizardite-, antigorite/lizardite- and antigorite-serpentinites displayed U-shaped
 
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