scholarly journals Magmatic segmentation of the northern Knipovich Ridge: Evidence for high-pressure fractionation at an ultraslow spreading ridge

2005 ◽  
Vol 6 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Bjarte Hellevang ◽  
Rolf B. Pedersen
Keyword(s):  
High Pressure ◽  
Spreading Ridge ◽  
Knipovich Ridge ◽  
Pressure Fractionation ◽  
Ultraslow Spreading Ridge

scholarly journals New interpretation of the spreading evolution of the Knipovich Ridge derived from aeromagnetic data

2020 ◽  
Vol 224 (2) ◽  
pp. 1422-1428
Author(s):  
M-A Dumais ◽  
L Gernigon ◽  
O Olesen ◽  
S E Johansen ◽  
M Brönner
Keyword(s):  
Plate Tectonics ◽  
Barents Sea ◽  
Spreading Ridge ◽  
Knipovich Ridge ◽  
Fram Strait ◽  
Aeromagnetic Survey ◽  
Rifted Margins ◽  
Ultraslow Spreading Ridge ◽  
New Interpretation ◽  
Present Understanding

SUMMARY Insights into the spreading evolution of the Knipovich Ridge and development of the Fram Strait are revealed from a recent aeromagnetic survey. As an ultraslow spreading ridge in an oblique system located between the Svalbard–Barents Sea and the Northeast Greenland rifted margins, the dynamics of the Knipovich Ridge opening has long been debated. Its 90° bend with the Mohns Ridge, rare in plate tectonics, affects the evolution of the Fram Strait and motivates the study of crustal deformation with this distinctive configuration. We identified magnetic isochrons on either side of the present-day Knipovich Ridge. These magnetic observations considerably reduce the mapped extent of the oceanic domain and question the present understanding of the conjugate rifted margins. Our analysis reveals a failed spreading system before a major spreading reorganization of the Fram Strait gateway around magnetic chron C6 (circa 20 Ma).

High-pressure fractionation of spent coffee grounds oil using green solvents

2020 ◽  
Vol 157 ◽  
pp. 104689 ◽  
Author(s):  
Raphaela G. Bitencourt ◽  
Fernando M.P.A. Mello ◽  
Fernando A. Cabral ◽  
Antonio J.A. Meirelles
Keyword(s):  
High Pressure ◽  
Green Solvents ◽  
Spent Coffee Grounds ◽  
Pressure Fractionation ◽  
Coffee Grounds

High-pressure fractionation in rift-related basaltic magmatism: Faeroe plateau basalts

Geology ◽  
1995 ◽  
Vol 23 (7) ◽  
pp. 671 ◽  
Author(s):  
Andrew C. Kerr ◽  
Robert N. Thompson ◽  
Stefan Bernstein
Keyword(s):  
High Pressure ◽  
Basaltic Magmatism ◽  
Pressure Fractionation

scholarly journals Relations between basalts and adakitic–felsic intrusive bodies in a soft-substrate environment: the South Ouessant Visean basin in the Variscan belt, Armorican Massif, France

2016 ◽  
Vol 53 (4) ◽  
pp. 441-456 ◽  
Author(s):  
Martial Caroff ◽  
Bernard Le Gall ◽  
Christine Authemayou ◽  
Denise Bussien Grosjean ◽  
Cyrill Labry ◽  
...  
Keyword(s):  
High Pressure ◽  
Early Stage ◽  
Variscan Orogeny ◽  
Variscan Belt ◽  
Soft Substrate ◽  
Mafic Intrusions ◽  
Partial Remelting ◽  
Pressure Fractionation ◽  
Peraluminous Granites ◽  
Armorican Massif

The metasedimentary and magmatic terranes in the southern part of the Ouessant Island (Western Brittany, France) are the offshore prolongation of the Léon Variscan metamorphic domain. They mainly consist of micaschists and subordinate amphibolitic lenses (meta-pillow lavas and volcaniclastic successions) cut by a swarm of trondhjemite sills, together with a large porphyritic monzogranite body, newly dated at 336 Ma, and later syeno-leucogranitic intrusions. A large spectrum of fluidal peperites, including spectacular “fiamme”-bearing breccias, is observable at the contact between metasediments and most of the intrusives. The coexistence of amphibolitized basalts, adakitic trondhjemites, and peraluminous granites in the inferred South Ouessant basin is assigned to a variety of deep subcontemporaneous processes, including asthenospheric partial melting, high-pressure fractionation in lithospheric reservoirs (or partial remelting of deep crystallized mafic intrusions), and continental crust melting. Implications of these new results are discussed in the Visean basinal framework of the Armorican Massif, formed at an early stage of the Variscan orogeny.

Modes of seafloor generation at a melt-poor ultraslow-spreading ridge

Geology ◽  
2006 ◽  
Vol 34 (7) ◽  
pp. 605 ◽  
Author(s):  
Mathilde Cannat ◽  
Daniel Sauter ◽  
Véronique Mendel ◽  
Etienne Ruellan ◽  
Kyoko Okino ◽  
...  
Keyword(s):  
Spreading Ridge ◽  
Ultraslow Spreading Ridge

Behavior of iron isotopes in hydrothermal systems: Beebe and Von Damm vent fields on the Mid-Cayman ultraslow-spreading ridge

2021 ◽  
Vol 575 ◽  
pp. 117200
Author(s):  
Wenhao Wang ◽  
Alastair Lough ◽  
Maeve C. Lohan ◽  
Douglas P. Connelly ◽  
Matthew Cooper ◽  
...  
Keyword(s):  
Hydrothermal Systems ◽  
Spreading Ridge ◽  
Iron Isotopes ◽  
Ultraslow Spreading Ridge
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