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| 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 |
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| 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 |
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| 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 |
 | Lonsdale, P.F., Bischoff, J.L., Burns, V.M., Kastner, M., Sweeney, R.E. (1980) A high-temperature hydrothermal deposit on the seabed at a gulf of California spreading center. Earth and Planetary Science Letters, 49 (1) 8-20 doi:10.1016/0012-821x(80)90144-2 | Journal (article/letter/editorial) |
| photographed and sampled extensive terraces and ledges of talc. The rock contains siliceous microfossils, smectite...euhedral pyrrhotite as well as rather pure iron-rich talc. Sulfur and oxygen isotopes indicate precipitation...sulfides and silicates [ 2 - 8 ] . The first samples of deep-sea hydrothermal fluids and minerals came from the...Red Sea sites in the mid-1960's [10], searches for deep-sea hydrothermal deposits were made in the closest...analogue, the Gulf o f California. The gulf has several deep basins that are sites of active though sedimentsmothered |
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| antigorite in abyssal-serpentinized peridotite. At mid-ocean spreading ridges, antigorite crystallizes under...antigorite in 49 samples drilled at the Hess Deep (East Pacific Rise) and the Atlantis Massif (Mid-Atlantic...processes and a local association with olivine or talc. We explain antigorite crystallization by the interaction...reevaluated. Keywords Antigorite · Serpentinization · Mid-ocean spreading ridges · Retrograde metamorphism Introduction...largescale serpentinization of mantle rock: mid-ocean spreading ridges and subduction zones. At slow- |
 | Francheteau, J., Armijo, R., Cheminee, J.L., Hekinian, R., Lonsdale, P., Blum, N. (1992) Dyke complex of the East Pacific Rise exposed in the walls of Hess Deep and the structure of the upper oceanic crust. Earth and Planetary Science Letters, 111 (1) 109-121 doi:10.1016/0012-821x(92)90173-s | Journal (article/letter/editorial) |
| [PT] Dyke complex of the East Pacific Rise exposed in the walls of Hess Deep and the structure of the...uppermost crust emplaced at the axis of the East Pacific Rise during dives conducted with the submersible...submersible Nautile on the walls of Hess Deep. At four widely separated locations, the same sequence was found:...subvertical (i.e. untilted) and parallel to the East Pacific Rise fabric. This sequence may be a general feature...from seismic experiments on the axis of the East Pacific Rise. Dyke thickness is a good measure of the depth |
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| 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 |
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| sections that formed at the fast-spreading East Pacific Rise (EPR) were mapped by submersible along steep...steep fault scarps that bound the Hess Deep rift valley. Excellent exposures allowed the documentation...formed at mid-ocean ridges with slower rates of spreading than the EPR are similar to Hess Deep, although...Introduction Field programs along the northern East Pacific Rise CEPR) have provided a wealth of new infortna1...infortna1 Present address: School of Earth and Ocean Sciences, University of Victoria, MS 4015 Victoria, |
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| Tribuzio3 Research and Development Center for Ocean Drilling Science, Japan Agency for Marine- Earth...Abstract Gabbroic rocks recovered from deep holes drilled in the ocean floor provide us with valuable information... Al-rich calcic amphibole (± cummingtonite) and talc, respectively. Plagioclase in direct contact with...typically found in olivine gabbros from other mid-ocean ridge localities. The coronitic biotite-chlorite...alteration processes. MA During the International Ocean Discovery Program (IODP) Expedition 360, Hole U1473A |
 | Francheteau, J., Armijo, R., Cheminée, J.L., Hekinian, R., Lonsdale, P., Blum, N. (1990) 1 Ma East Pacific Rise oceanic crust and uppermost mantle exposed by rifting in Hess Deep (equatorial Pacific Ocean) Earth and Planetary Science Letters, 101 (2) 281-295 doi:10.1016/0012-821x(90)90160-y | Journal (article/letter/editorial) |
| [XLeP] 1 Ma East Pacific Rise oceanic crust and uppermost mantle exposed by rifting in Hess Deep (equatorial...(equatorial Pacific Ocean) J. F r a n c h e t e a u a, R. A r m i j o a, J.L. C h e m i n r e a, R. H e k...Most of the dives were devoted to the study of Hess Deep, a rift valley produced by rifting of oceanic...created at the axis of the very fast-spreading East Pacific Rise. The dives have enabled the structures and...intra-rift ridge located to the north of the axis of Hess Deep. This shows that this situation is not specific |
 | | 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 |
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| circulation at fast-spreading ridges: insights from Hess Deep C. J. MacLeod and C. E. Manning Geological Society...circulation at fast-spreading ridges: insights from Hess Deep C. J. M A c L E O D 1 & C. E . M A N N I N G 2...more complex. Gabbros exposed at Hess Deep and sampled by the Ocean Drilling Program during Leg 147 provide...fluid flow within several kilometres of the East Pacific Rise axis. Later, dense fracturing and limited...multi-stage structural and metamorphic evolution of the Hess Deep plutonics may be a good analogue for the cooling |
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| high-temperature metamorphism of East Pacific Rise gabbros from Hess Deep Craig E. Manning *, Patricia...the cooling history of the lower crust near mid-ocean ridges, but the temperature range, rate, and location...and duration of metamorphism in East Pacific Rise gabbros from Hess Deep, ODP Hole 894G. Metamorphic hornblende...as a function of ridge setting. Keywords: East Pacific Rise; ODP Site 894; hydrothermal rocks; geologic...Using metamorphosed gabbros of the East Pacific Rise (EPR) from Hess Deep, we combine plagioclase-hornblende |
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| apparent difference in oxygen isotope compositions of ocean crusts formed with different spreading rates has...has important implications on the buffering of ocean water over geological time, as well as on the oxygen...Geology 233 (2006) 217–234 reactions in the upper ocean crust have the largest effects on the net chemical...and crust, crust–seawater reactions in the lower ocean crust are also critical for global geochemical budgets...1998, 2000; Eiler, 2001). The 18O composition of ocean water results mainly from the balance of two independent |
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| chromian spine1 can be also formed under the mid-ocean ridge condition [2,3]. The inclusion was found in...micropod within dunite drilled from Hess Deep, equatorial Pacific (see plate l-5 of Ref. [2]). The minerals...slab [3]. I think from the evidence from both Hess Deep and Mid-Cayman Trough [3] that the concentration...this case). The melt trapped by the spine1 from Hess Deep is supposed to be also alkalic but its chemical...chromitites and related rocks (troctolite for Hess Deep). Note that the TiOz contents are negatively correlated |
 | Perk, Neil W., Coogan, Laurence A., Karson, Jeffrey A., Klein, Emily M., Hanna, Heather D. (2007) Petrology and geochemistry of primitive lower oceanic crust from Pito Deep: implications for the accretion of the lower crust at the Southern East Pacific Rise. Contributions to Mineralogy and Petrology, 154 (5) 575-590 doi:10.1007/s00410-007-0210-z | Journal (article/letter/editorial) |
| Pito Deep: implications for the accretion of the lower crust at the Southern East Pacific Rise Neil W...crust formed at the southern East Pacific Rise and exposed at the Pito Deep has been examined. These rocks...the Hess Deep) in which a substantial depth into the plutonic complex formed at the East Pacific Rise...In contrast to the uppermost plutonic rocks at Hess Deep, the rocks studied here are generally primitive...samples crystallized from was aggregated normal mid-ocean ridge basalt (MORB). Despite this high Mg# clinopyroxene |
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| hydrothermal processes in the lower ocean crust at and near the East Pacific Rise Timo M. Kirchner • Kathryn M...contiguous section of young East Pacific Rise (EPR) crust at the Hess Deep Rift provide the first regional-scale...sheeted dike complexes on their own at Hess and Pito Deeps, and Ocean Drilling Program Hole 504B. Alteration...and near fast-spreading ridges. Keywords East Pacific Rise Gabbros Hydrothermal systems Sr isotopes...isotopes Pervasive fluid flow Hess Deep Introduction Communicated by J. Hoefs. Electronic supplementary |
 | Hekinian, R., Bideau, D., Cannat, M., Francheteau, J., Hébert, R. (1992) Volcanic activity and crust-mantle exposure in the ultrafast Garrett transform fault near 13°28′S in the Pacific. Earth and Planetary Science Letters, 108 (4) 259-275 doi:10.1016/0012-821x(92)90027-s | Journal (article/letter/editorial) |
| ultrafast Garrett transform fault near 13°28'S in the Pacific R. Hekinian a, D . Bideau a M. Cannat b j...iii!ii!iiiiiiiiii::::::::::::::;!::i:: i - \ / DEEP //-'~-~:~. I " Islimds I // | - oa,,,~...l location m a p of the eastern Pacific showing the East Pacific Rise and the G a r r e t t transform...13°28'S. parallel ridges separated by a 3800 m deep basin (Fig. 2B). These oblique-trending ridges have...oblique-trending ridges identified in other south Pacific transform faults have been interpreted as extensional |
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| Montpellier, France Abstract It has been proposed that deep, high-T (up to 1000°C) hydrothermal alteration occurred...the paleo-ridge axis in the Oman ophiolite. In the deep, hot gabbros, the main water channels are submillimetric...close to the ridge axis. Since the first record of deep and high temperature hydrothermal alteration in...strontium and oxygen isotope tracing, the possibility of deep penetration of seawater close to the axis of fast...One reason was the difficulty of integrating such deep circulation in the framework of the wing-shaped |
 | Gillis, Kathryn M., Muehlenbachs, Karlis, Stewart, Michael, Gleeson, Thomas, Karson, Jeffrey (2001) Fluid flow patterns in fast spreading East Pacific Rise crust exposed at Hess Deep. Journal of Geophysical Research: Solid Earth, 106. 26311-26329 doi:10.1029/2000jb000038 | Journal (article/letter/editorial) |
| 2001 Fluid flow patterns in fast spreading East Pacific Rise crust exposedat HessDeep Kathryn M. Gillis...complexover a 4-km- wideregionat HessDeep(equatorial Pacific)revealsignificant spatialheterogeneity (10-103m)...hydrothermalalterationin young,fast spreadingEastPacific Rise crust.The volcanicsequenceis fairly uniformlyaltered...EPR CRUST AT HESS DEEP either buriedby lava or changesin the hydrologicaland thermal east-westtrendingscarpsthatboundthe...sheeteddikesthatformedat the fast youngingfrom west to east(Figure 2a). Volcanicrocksform the spreadingEPR. |
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| LETTER Petrology of podiform chromitite from the ocean floor at the 15°20′N FZ in the MAR, Site 1271, ODP...(FZ) in the Mid Atlantic Ridge (MAR) during an Ocean Drilling Program cruise, ODP Leg 209. It is observed...value of the chromitite “minipod” sampled from Hess Deep (Arai and Matsukage, 1996). Samples associated...a few chromitite samples have been found on the ocean floor. A chromitite “minipod” included in a troctolite...dunite has been reported from Hess Deep at the junction of the East Pacific Rise and the Galapagos Rift (Site |
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| high-temperature metamorphism of East Pacific Rise gabbros from Hess Deep C.E. Manning, P.E. Weston and...seafloor hydrothermal fluids from 9-10”N East Pacific Rise S.E.OostingandK.L.VonDamm .. . . . . . . ...from off-axial deposits at 12”43’N on the East Pacific Rise Y. Fouquet. R. Knott. P. Cambon, A. Fallick...Rapid emplacement of a mid-ocean ridge lava flow on the East Pacific Rise at 9” 46’-5 I’N T.K.P. Gregg...constraints on differentiation and H,O abundance of talc-alkaline magmas T.Kawamoto..................... |
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| association in the Garrett Transform, * 13”28’S, East Pacific Rise CEPR), provides a prime opportunity for examining...peridotites from elsewhere at the EPR (i.e., Hess Deep and the Terevaka Transform) also are similarly...Azores hotspot in the Atlantic Ocean and Bouvet hotspot in the Indian Ocean), and is significantly higher...be the average extent of melting beneath global ocean ridges. Many of these harzburgite samples, however...harzburgite; mid-ocean ridge hasahs; East Pacific Rise; mantle; melts; mid-ocean Introduction 1. |
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| to periodic diking in the crust. Keywords: mid-ocean ridges; igneous rocks; petrology: lower crust;...(REE) and trace element contents similar to mid-ocean ridge basalt (MORB) [l-3]. In detail, concentrations...ophiolite were similar to processes at normal mid-ocean ridges. On the basis of radiometric age data, subdued...at a fast-spreading ridge similar to the East Pacific Rise CEPR), and is different from crust formed...not only to Oman, but is general for lavas at mid-ocean ridges (e.g., [50]), especially the fast-spreading |
 | Hekinian, Robert, Hoffert, Michel, Larque, Philippe, Cheminee, Jean-Louis, Stoffers, Peter, Bideau, Daniel (1993) Hydrothermal Fe and Si oxyhydroxide deposits from South Pacific intraplate volcanoes and East Pacific Rise axial and off-axial regions. Economic Geology, 88 (8) 2099-2121 doi:10.2113/gsecongeo.88.8.2099 | Journal (article/letter/editorial) |
| Si-enrichedoxyhydroxide precipitatesare commonconstituentsof ocean-floor deposits in a greatvarietyof geologicsettings... 3o •_ •w Fe & Si OXYHYDROXIDE DEPOSITS,S. PACIFIC & EPR REGION 2101 marinehydrothermalactivity(Bonattiand...someland- found on axial and off-axial structures of the East Pabasedsulfidedeposits(e.g.,Cyprus,Oman)are con-...the intraplatevolcanoes as- where on the East Pacific Rise off-axial seamounts sociatedwith the Society...Pitcairn)regions andaccreting plateboundary regions ofthe East PacificRise near 21 ø N, 12ø43' N, and 11o30' N |
