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Online-Ressource

SO 145 - EXCO II: Austauschprozesse zwischen Kruste und Ozean am Ostpazifischen Rücken südlich der Garret Bruchzone (14[Grad]S) : Abschlussbericht zum BMBF-Projekt 03G0145A (2002)

Villinger, H. ; Grevemeyer, Ingo ; Universität Bremen Fachbereich Geowissenschaften

Bremen

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Schlagwort(e): Forschungsbericht

Materialart: Online-Ressource

Seiten: Online-Ressource (91 p., 10,1 Mb.) , ill., graphs

Ausgabe: [Elektronische Ressource]

URL: https://edocs.tib.eu/files/e01fb04/37729392X.pdf

URL: https://doi.org/10.2314/GBV:37729392X

URL: https://edocs.tib.eu/files/e01fb04/37729392Xl.pdf

DOI: 10.2314/GBV:37729392X

Sprache: Deutsch

Anmerkung: Contract BMBF 03G0145A. - Differences between the printed and electronic version of the document are possible , Also available as printed version , A multibeam-sonar, magnetic and geochemical flowline survey at 14[grad]14'S on the southern East Pacific Rise: insights into the fourth dimension of ridge crest segmentation / Ingo Grevemeyer... , Systemvoraussetzungen: Acrobat reader.

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Artikel

Gashydrate als Energiepotentiale der Zukunft (2002)

Villinger, Heinrich

Bremen

Dazugehörige Bände

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In: Impulse aus der Forschung, Bremen : Univ., 1986, (2002), Seite 12-15, 0179-9495

In: year:2002

In: pages:12-15

Materialart: Artikel

Seiten: Ill., graph. Darst.

ISSN: 0179-9495

Sprache: Deutsch

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Component parts of the World Heat Flow Data Collection (2004)

Grevemeyer, Ingo ; Kopf, Achim J ; Fekete, Noemi ; [weitere]

PANGAEA

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Publikationsdatum: 2023-09-01

Schlagwort(e): Area/locality; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Sample, optional label/labor no

Materialart: Dataset

Format: text/tab-separated-values, 70 data points

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Crustal underplating and its implications for subsidence and state of isostasy along the Ninetyeast Ridge hotspot trail (2000)

Grevemeyer, Ingo ; Flueh, Ernst R.

Wiley

In: Geophysical Journal International, 142 (2). pp. 643-649.

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Publikationsdatum: 2018-01-31

Beschreibung: Recent seismic field work has revealed high lower-crustal velocities under Ninetyeast Ridge, Indian Ocean, indicating the presence of crustal underplating (Grevemeyer et al. 2000). We used results from Ocean Drilling Program (ODP) drill cores and cross-spectral analysis of gravity and bathymetric data to study the impact of the underplating body on the subsidence history and the mode of isostatic compensation along Ninetyeast Ridge. Compared with the adjacent Indian basin, the subsidence of Ninetyeast Ridge is profoundly anomalous. Within the first few millions of years after crustal emplacement the ridge subsided rapidly. Thereafter, however, subsidence slowed down significantly. The most reliable model of isostasy suggests loading of a thin elastic plate on and beneath the seafloor. Isostatic compensation of subsurface loading occurs at a depth of about 25km, which is in reasonably good agreement with seismic constraints. Subsurface loading is inherently associated with buoyant forces acting on the lithosphere. The low subsidence may therefore be the superposition of cooling of the lithosphere and uplift due to buoyant material added at the base of the crust. A model including prolonged crustal growth in the form of subcrustal plutonism may account for all observations.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1046/j.1365-246x.2000.00154.x

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Crustal architecture and deep structure of the Ninetyeast Ridge hotspot trail from active-source ocean bottom seismology (2001)

Grevemeyer, Ingo ; Flueh, Ernst R. ; Reichert, C. ; [weitere]

Wiley

In: Geophysical Journal International, 144 (2). pp. 414-431.

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Publikationsdatum: 2018-01-31

Beschreibung: A 550-km-long transect across the Ninetyeast Ridge, a major Indian ocean hotspot trail, provided seismic refraction and wide-angle reflection data recorded on 60 ocean bottom instruments. About 24 000 crustal and 15 000 upper mantle arrivals have been picked and used to derive an image of the hotspot track. Two approaches have been chosen: (i) a first-arrival tomographic inversion yielding crustal properties; and (ii) forward modelling of mantle phases revealing the structure at the crust–mantle boundary region and of the uppermost mantle. Away from the volcanic edifice, seismic recordings show the typical phases from oceanic crust, that is, two crustal refraction branches (Pg), a wide-angle reflection from the crust–mantle boundary (PmP) and a wave group turning within the upper mantle (Pn). Approaching the edifice, three additional phases have been detected. We interpret these arrivals as a wide-angle reflection from the base of material trapped under the pre-hotspot crust (Pm2P) and as a wide-angle reflection (PnP) and its associated refraction branch (PN) from a layered upper mantle. The resulting models indicate normal oceanic crust to the west and east of the edifice. Crustal thickness averages 6.5–7 km. Wide-angle reflections from both the pre-hotspot and the post-hotspot crust–mantle boundary suggest that the crust under the ridge has been bent downwards by loading the lithosphere, and hotspot volcanism has underplated the pre-existing crust with material characterized by seismic velocities intermediate between those of mafic lower crustal and ultramafic upper mantle rocks (7.5–7.6 km s−1). In total, the crust is up to ≈ 24 km thick. The ratio between the volume of subcrustal plutonism forming the underplate and extrusive and intrusive volcanism forming the edifice is about 0.7. An important observation is that underplating continued to the east under the Wharton Basin. During the shield-building phase, however, Ninetyeast Ridge was located adjacent to the Broken Ridge and was subsequently pulled apart along a transform fault boundary. Therefore, underplating eastwards of the fracture zone separating the edifice from the Wharton Basin suggests that prolonged crustal growth by subcrustal plutonism occurred over millions of years after the major shield-building stage. This fact, however, requires mantle flow along the fossil hotspot trail. The occurrence of PnP and PN arrivals is probably associated with a layered and anisotropic upper mantle due to the preferential alignment of olivine crystals and may have formed by rising plume material which spread away under the base of the lithosphere.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1046/j.0956-540X.2000.01334.x

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Tectonic Structure of the Middle America Pacific Margin and Incoming Cocos Plate From Costa Rica to Guatemala (2003)

Ranero, Cesar ; Weinrebe, Reimer Wilhelm ; Grevemeyer, Ingo ; [weitere]

In: [Talk] In: AGU Fall Meeting 2003, 08.-12.12.2003, San Francisco, USA .

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Publikationsdatum: 2019-09-23

Materialart: Conference or Workshop Item , NonPeerReviewed

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Tectonics, fluid flow and seismogenesis at erosional margins (2004)

Ranero, C. R. ; Grevemeyer, Ingo ; Weinrebe, Reimer Wilhelm ; [weitere]

In: [Talk] In: Annual Meeting of the European Geoscience Union, Nice .

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Publikationsdatum: 2019-09-23

Materialart: Conference or Workshop Item , NonPeerReviewed

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Fluid flow through active mud dome Mound Culebra offshore Nicoya Peninsula, Costa Rica: evidence from heat flow surveying (2004)

Grevemeyer, Ingo ; Kopf, A. J. ; Fekete, Noemi ; [weitere]

Elsevier

In: Marine Geology, 207 . pp. 145-157.

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Publikationsdatum: 2019-09-23

Beschreibung: Mud extrusion is frequently observed as a dewatering phenomenon in compressional tectonic settings such as subduction zones. Along the Middle American Trench, several of these features have been recently discovered. This paper presents a heat flow study of actively venting Mound Culebra, offshore Nicoya Peninsula, and is complemented by data from geophysical surveys and coring. The mud diapir is characterised by methane emission and authigenic carbonate formation at its crest, and is composed of overconsolidated scaly clays and clast-bearing muds. Compared with the conductive background heat flow, the flux through the mud dome is elevated by 10–20 mW/m2, possibly related to advection of heat by fluids rising from greater depth. Decreased chlorinity in the pore waters from gravity cores may support a deep-seated fluid origin. Geothermal measurements across the mound and temperature measurements made with outriggers on gravity corers were corrected for the effects of thermal refraction, forced by the topography of the mound. Corrected values roughly correlate with the topography, suggesting advection of heat by fluids rising through the mound, thereby generating the prominent methane anomaly over the dome and nurturing vent biota. However, elevated values occur also to the southeast of the mound. We believe that the overconsolidated clays and carbonates on the crest form an almost impermeable lid. Fluids rising from depth underneath the dome are therefore partially channelled towards the flanks of the mound.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1016/j.margeo.2004.04.002

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