Tectonic, magmatic, hydrothermal, and biological segmentation of mid-ocean ridges



Publisher: The Geological Society, Publisher: Distributors, USA, AAPG Bookstore in London, Tulsa, OK, USA

Written in English
Cover of: Tectonic, magmatic, hydrothermal, and biological segmentation of mid-ocean ridges |
Published: Pages: 258 Downloads: 520
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Subjects:

  • Mid-ocean ridges.,
  • Sea-floor spreading.,
  • Magmatism.,
  • Hydrothermal vents.,
  • Submarine geology.,
  • Deep-sea ecology.

Edition Notes

Includes bibliographical references and index.

Statementedited by C.J. MacLeod, P.A. Tyler, and C.L. Walker.
SeriesGeological Society special publication ;, no. 118
ContributionsMacLeod, C. J., Tyler, Paul A., Walker, C. L.
Classifications
LC ClassificationsQE511.7 .T43 1996
The Physical Object
Paginationix, 258 p. :
Number of Pages258
ID Numbers
Open LibraryOL3632243M
ISBN 101897799721
LC Control Number2002427067

Geophysical Research Letters; Global Biogeochemical Cycles; Journal of Advances in Modeling Earth Systems (JAMES). The hydrothermal vent in Area A (°S, °E) is the first active hydrothermal vent discovered on the Southwest Indian Ridge (SWIR). Heat source and adequate bulk permeability are two necessary factors for the formation of a hydrothermal vent. Along the SWIR °E to °E, the gravity-derived crustal thickness is up to km, much thicker than the average thickness of the global. Magmatic and tectonic extension at mid-ocean ridges: 2. Origin of axial morphology Garrett Ito Department of Geology and Geophysics, SOEST, University of Hawai’i at Manoa, East-West Road, POST , Honolulu, Hawaii , USA ([email protected]) Mark D. Behn. Fast-spreading mid-ocean ridges (MOR) are a major birthplace of the oceanic crust on Earth. The axial melt lens, being about 1– km below the sea floor as small as.

Mid‐ocean ridges with different spreading rates (slow vs fast) display variability in the mode and nature of hydrothermal, magmatic and tectonic activities, which in turn results in variations in volcanic products and their isotopic signatures. Mid-Ocean ridges are active volcanic mountain ranges snaking through the depths of the Earth’s oceans. They occur where the edges of the Earth’s tectonic plates are separating, allowing mantle rock to rise to the seafloor and harden, creating new addition of this crust can cause ocean basins to widen perpendicular to the ridge. Our research on magmatic processes at mid-ocean ridges Ridge axis morphology evolves with changes in magmatic activity. ALARCON RISE and ENDEAVOUR RIDGE – Mid‐ocean ridge axes are marked by segmentation of the axes and underlying magmatic systems. Fine‐scale segmentation has mainly been studied along fast‐spreading ridges.   Tectonic, Magmatic, Hydrothermal and Biological Segmentation of Mid-Ocean Ridges: Geological Society Special Publication. pp. – Carney S, Peoples J, Fisher C, Schaeffer S () AFLP analyses of genomic DNA reveal no differentiation between two phenotypes of the vestimentiferan tubeworm Ridgeia piscesae.

The complex geology and expansive axial valleys typical of slow-spreading ridges makes evaluating their hydrothermal activity a challenge. This challenge has gone largely unmet, as the most undersampled MOR type for hydrothermal activity is slow spreading ( mm/yr). Here we report the first systematic hydrothermal plume survey conducted on the Central Indian Ridge (CIR, 8°S°S), the. Ocean ridge segmentation and hot vent tubeworms in the northeast Pacific. in Tectonic, Magmatic, Hydrothermal and Biological Segmentation of Mid-Ocean Ridges, MacLeod, C. J., P. Tyler & C. L. Walker (eds). Geological Society Special Publication No. , pp. Tunnicliffe, V. and C. M. R. Fowler. Influence of sea-floor spreading on. Recent eruptions on the CoAxial segment of the Juan de Fuca Ridge: Implications for mid-ocean ridge accretion processes. R. W. Embley, 1 W. W. Chadwick, 2 M. R. Perfit, 3 M. C. Smith, 3 and J. R. Delaney 4 1 Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Hatfield Marine Science Center, Newport, Oregon. The Pacific-Farallon Ridge was a spreading ridge during the late Cretaceous that exten km in length and separated the Pacific Plate to the west and the Farallon Plate to the east. It ran south from the Pacific-Farallon-Kula triple junction at 51°N to the Pacific-Farallon-Antarctic triple junction at 43°S. As the Farallon Plate subducted obliquely under the North American Plate, the.

Tectonic, magmatic, hydrothermal, and biological segmentation of mid-ocean ridges Download PDF EPUB FB2

Tectonic, Magmatic, Hydrotherma, & Biological Segmentation at Mid-Ocean Ridges (Geological Society Special Publication, No. ) illustrated edition. Tectonic, magmatic, hydrothermal and biological segmentation of mid-ocean ridges C.

MacLeod, P. Tyler, C. Walker We now recognize that mid-ocean ridges are not simple, two-dimensional features, but are instead partitioned into morphologically distinct segments on a variety of scales.

The Tectonic of this book is to explore the causes and consequences of this ridge segmentation from the tectonic, magmatic, hydrothermal and biological viewpoint.

It comprises 15 chapters of recent findings that span and attempt to link the entire spectrum of mid-ocean research.

Tectonic, Magmatic, Hydrothermal and Biological Segmentation of Mid-ocean Ridges Volume of Geological Society London: Geological Society special publication Issue of Geological Society. We now recognize that mid-ocean ridges are not simple, two-dimensional features, but are instead partitioned into morphologically distinct segments on a variety of scales.

Variations in axial morphology reflect differences in the structure of the magma reservoirs and in the nature of mantle upwelling beneath the ridge. Segment ends may be starved of magma, and spreading accommodated by.

ISBN: OCLC Number: Description: ix, pages: illustrations (some color), maps ; 26 cm: Contents: Southeast Indian ridge between ° and °40ʹE: contrasts in segmentation characteristics and implications for crustal accretion / J.C. Sempéré, B.P. West & L. Géli --Segmentation of the Mid-Atlantic Ridge south of the Azores, based on acoustic.

Book Review: Tectonic, magmatic, hydrothermal and biological segmentation of mid-ocean ridges. By C.J. MacLeod, P.A. Tyler and C.L. Walker (Editors). Stanford Libraries' official online search tool for books, media, journals, databases, government documents and more.

Tectonic, magmatic, hydrothermal and biological segmentation of mid-ocean ridges in SearchWorks catalog.

Tectonic, Magmatic, Hydrotherma, & Biological Hydrothermal at Mid-Ocean Ridges We now recognize that mid-ocean ridges are not simple, two-dimensional features, but are instead partitioned into morphologically distinct segments on a variety of scales.

Mid-ocean ridges display tectonic segmentation defined by discontinuities of the axial zone, and geophysical and geochemical observations suggest segmentation of the underlying magmatic plumbing.

To address long-standing questions on relationships between tectonic, magmatic, and geochemical segmentation of ocean ridges, we synthesized geological, geophysical and geochemical data in well-studied axial regions at a range of spreading rates. At fast and slow spreading ridges, changes in ridge properties such as axial depth, gravity anomalies, crustal thickness, and lava composition.

The origin of mid-ocean ridge segmentation is commonly attributed to three-dimensional mantle upwelling (Macdonald et al., (Macdonald et al., Schouten et al., ).In this view, the.

crust and a presumably high magmatic budget. This paucity of hydrothermal activity may be related to the peculiar tectonic setting at Woodlark, where repeated ridge jumps and a re-location of the rotation pole both lead to axial magmatism being more widely distributed than at many other, more mature and stable mid-ocean ridges.

The objective of the Naudur cruise (December ) of the submersible Nautile was to study the interaction among magmatic, tectonic, and hydrothermal processes at a very fast spreading mid‐ocean ridge axis.

Twenty‐three dives were completed, both along and across the axis, in four areas located between 17°10′ and 18°45′S on the East Pacific Rise. Genre/Form: Electronic book Electronic books: Additional Physical Format: Print version: Tectonic, magmatic, hydrothermal, and biological segmentation of mid-ocean ridges.

What the 57°45′N AVR case-study does reveal, however, is that we cannot yet make reliable predictions about the presence or absence of hydrothermal venting, using even our most sophisticated interpretations of magmatic–tectonic cycles in isolation (cf. 2, 36). The possible role of ridge segmentation.

The Woodlark Basin is one of the rare places on earth where the transition from continental breakup to seafloor spreading can be observed. The potential juxtaposition of continental rocks, a large magmatic heat source, crustal-scale faulting, and hydrothermal circulation has made the Woodlark Basin a prime target for seafloor mineral exploration.

The origin of mid-ocean ridge segmentation—the systematic along-axis variation in tectonic and magmatic processes—remains controversial.

It is commonly assumed that mantle flow is a. Here, observations of tectonic and magmatic segmentation at ridges spreading from fast to ultraslow rates are reviewed in light of influential concepts of ridge segmentation, including the notion of hierarchical segmentation, spreading cells and centralized v.

multiple supply of mantle melts. Tectonic, Magmatic, Hydrothermal and Biological Segmentation of Mid-ocean Ridges by C. MacLeod,Peter A. Tyler,Paul A. Tyler,C. Walker Book Resume: Download or read Tectonic, Magmatic, Hydrothermal and Biological Segmentation of Mid-ocean Ridges book by clicking button below to visit the book download website.

The Lucky Strike segment is one of the sites chosen by the scientific community for long-term seafloor observation to study the interaction between magmatic, tectonic, hydrothermal, and biological. Hydrothermal circulation occurs when seawater percolates downward through fractured ocean crust along the volcanic mid-ocean ridge (MOR) system.

The seawater is first heated and then undergoes chemical modification through reaction with the host rock as it continues downward, reaching maximum temperatures that can exceed °C.

Mid-ocean ridges are created by the upwelling of basaltic lava and lateral rifting of ocean crust (Figure ). They form a rift valley system that encircles the Earth along a total length of o km (Figure ). The mid-ocean ridges are the earth’s largest volcanic system, accounting for >75% of all volcanic activity on the planet.

the ridge axis [Buck et al., ; Tucholke et al., ]. [6] The goal of this study is to explore the rela-tionship between magmatic and tectonic extension, axial thermal structure, and faulting at mid-ocean ridges. To do so, we develop a 2-D elastic-visco-plastic model for dike injection that accounts for both the thermal and mechanical.

The hydrothermal phase, Clague et al.'s addition to the Kappel and Ryan model of tectonic‐magmatic cycles, continues today. The 1‐m resolution mapping data, which resolve individual chimney structures, were used to determine the volume and tonnage of the extensive hydrothermal deposits (Jamieson et.

Richard A. Volkert, John N. Aleinikoff, C. Mark Fanning, "Tectonic, magmatic, and metamorphic history of the New Jersey Highlands: New insights from SHRIMP U-Pb geochronology", From Rodinia to Pangea: The Lithotectonic Record of the Appalachian Region, Richard P.

Tollo, Mervin J. Bartholomew, James P. Hibbard, Paul M. Karabinos. Hydrothermal circulation at the axis of mid-ocean ridges affects the chemistry of the lithosphere and overlying ocean, supports chemosynthetic biological. We have collected 12 kHz SeaBeam bathymetry and kHz DSL side-scan sonar and bathymetry data to determine the tectonic and volcanic segmentation along the fastest spreading (̃ km/Myr) part of the global mid-ocean ridge system, the southern East Pacific Rise between the Easter and Juan Fernandez microplates.

This area is presently reorganizing by large-scale dueling rift propagation. The Gorda Ridge (41°36'"N °22'"W), aka Gorda Ridges tectonic spreading center, is located roughly kilometres ( mi) off the northern coast of California and southern g NE – SW it is roughly kilometres ( mi) in length.

The ridge is broken into three segments; the northern ridge, central ridge, and the southern ridge, which contains the Escanaba Trough.

The KHF is a black-smoker-type high temperature field, but fluids have an unusually high concentration of H 2 (– mmol/kg), despite similarities to typical basalt-hosted mid-ocean ridge hydrothermal fluids in its other mineral and gas element compositions (Van Dover et al. ; Gallant and Von Damm ; Kumagai et al.

Segmentation, therefore, plays a vital role in the inter-relationship between all tectonic, magmatic, hydrothermal and biological processes at mid-ocean ridges.At several ridge segments along the slow-spreading Mid-Atlantic Ridge, the lithosphere appears to be cooled by centrally located, isolated hydrothermal fields, hundreds of meters wide, extracting as much as MW from the lithosphere and hosting very large (>10 6 m 3) sulfide fields are possibly fueled by subseafloor hydrothermal cells cooling and leaching the lithosphere up.The results of the project have been summarized comprehensively in 50 chapters, and this book provides an overall introduction and relevant topics on the mid-ocean ridge system of the Indian Ocean and on the arc-backarc systems of the Southern Mariana Trough and Okinawa Trough.

Category: Science Mantle Flow And Melt Generation At Mid Ocean Ridges.