Results 211 to 220 of about 50,013 (255)
Some of the next articles are maybe not open access.
Hydrothermal mineralization at seafloor spreading centers
Earth-Science Reviews, 1984The recent recognition that metallic mineral deposits are concentrated by hydrothermal processes at seafloor spreading centers constitutes a scientific breakthrough that opens active sites at seafloor spreading centers as natural laboratories to investigate ore-forming processes of such economically useful deposits as massive sulfides in volcanogenic ...
Peter A Rona
exaly +2 more sources
Metallogenesis at Oceanic Spreading Centers
Annual Review of Earth and Planetary Sciences, 1975Enrico Bonatti
exaly +2 more sources
Birth of an intraoceanic spreading center
Geology, 2008The Cocos-Nazca spreading center is one of the few examples of the formation of a spreading center by splitting of oceanic lithosphere. It was created when the Farallon plate, broke up in the early Miocene following the collision of the Pacific-Farallon spreading center with the North American continent. Much of the ancient Farallon plate corresponding
Udo Barckhausen +4 more
openaire +4 more sources
An overlapping propagating spreading center at 87°30′W on the Galapagos Spreading Center
Earth and Planetary Science Letters, 1994Abstract In September of 1987 we completed a SeaMARC II (SMII) survey of the propagating spreading center located at 87°30′W on the Galapagos Spreading Center (GSC). The spreading rate in the area is intermediate with a full rate of approximately 70 mm/yr and the spreading axis is marked by an axial high.
Laura Jean Perram, Ken C. Macdonald
openaire +1 more source
Bulletin of the Atomic Scientists, 2005
Whatever optimism had accrued during the late 1950s had disappeared by early 1968. Following a trend of “international anarchy,” both France and China began building their nuclear arsenals in earnest, war raged on the Indian subcontinent, in the Middle East, and in Vietnam.
openaire +1 more source
Whatever optimism had accrued during the late 1950s had disappeared by early 1968. Following a trend of “international anarchy,” both France and China began building their nuclear arsenals in earnest, war raged on the Indian subcontinent, in the Middle East, and in Vietnam.
openaire +1 more source
Crustal processes at spreading centers
Reviews of Geophysics, 1983Recent discoveries and research on mid‐ocean ridges (MOR's) in the last four years have greatly increased our knowledge of this fundamental type of plate boundary. The last IUGG review of MOR research was in 1975 [Aumento et al., 1975], and its omission as a topic in 1978 may have reflected a feeling that spreading centers were reasonably well ...
openaire +1 more source
Are spreading centers perpendicular to their transform faults?
Nature, 1977A COMMON assumption in seafloor spreading is that mid-ocean ridge crests are aligned perpendicular to their transform faults and, hence, to their spreading directions. There are some well known exceptions to this rule, for example, the Reykjanes Ridge. Vogt et al.1 suggested that spreading systems may take one of two configurations: either a transform ...
TANYA ATWATER, KEN C. MACDONALD
openaire +1 more source
Dynamics of a passive spreading center
Journal of Geophysical Research, 1976At a passive spreading center the motion of the fluid rising in the conduit between diverging lithosphere plates is generated by the motion and weight of the plates. Combined gravity and viscous forces exerted by the rising material on the overhanging conduit walls deform the adjacent lithosphere to produce sea floor topography.
openaire +1 more source
Evidence of Local Migration of a Spreading Center
Geology, 1975Patterns of magnetic anomalies associated with sea-floor spreading are not precisely parallel but undulate slightly with reference to each other. This produces deviations from ideal two-dimensionality. Such undulating patterns are well displayed in a region southwest of the Blanco fracture zone where coherent spreading-velocity anomalies show ...
openaire +1 more source
Spreading a Patient-Centered Medical Home Redesign
Journal of Ambulatory Care Management, 2012Health care leaders and policymakers are turning to the patient-centered medical home (PCMH) model to contain costs, improve the quality of care, and create a more positive primary care work environment. We describe how Group Health, an integrated delivery system, developed and implemented a PCMH intervention that included standardized structural and ...
Clarissa, Hsu +8 more
openaire +2 more sources