Magmatism in the Garrett transform fault (East Pacific Rise near 13°27′S)
نویسندگان
چکیده
منابع مشابه
Evidence and implications of crustal magmatism on the flanks of the East Pacific Rise
a r t i c l e i n f o Keywords: East Pacific Rise mid-ocean ridge oceanic crust off-axis magmatism waveform modeling Formation of oceanic crust along the East Pacific Rise is thought to be complete within a few kilometers of the rise axis. Here, however, we present evidence for magmatism 20 km from the spreading center in 300-ka-old crust. Seismic data reveal an intrusive complex ~ 2 km beneath...
متن کاملGeochemistry of lavas from the Garrett Transform Fault: insights into mantle heterogeneity beneath the eastern Pacific
Young intra-transform lavas erupted as a result of extension within the Garrett Transform Fault on the southern East Pacific Rise, are more porphyritic, less evolved, have lower concentrations of incompatible trace elements, and lower ratios of more incompatible to less incompatible elements (e.g. low K=Ti and La=Sm) compared to lavas from the adjacent East Pacific Rise ridge axis. Sr, Nd and P...
متن کاملUpper Crustal Resistivity Structure of the East Pacific Rise near 13 N
_Abstract. An active source electromagnetic (EM) sounding has been conducted on the axis of the East Pacific Rise (EPR) at 13 ø 10 •N. 1D inversion and modelling techniques, seeking resistivity as a function of depth, have been applied to 8 Ilz amplitude data collected along the ridge crest. Resistivity is seen to increase monotonically between 50 m and 1 km below the seafloor, increasing from ...
متن کاملWhole mantle shear structure beneath the East Pacific Rise
[1] We model broadband seismograms containing triplicated S, S, and S along with ScS to produce a pure path one-dimensional model extending from the crust to the core-mantle boundary beneath the East Pacific Rise. We simultaneously model all body wave shapes and amplitudes, thereby eliminating depth-velocity ambiguities. The data consist of western North American broadband recordings of East Pa...
متن کاملSeismic heterogeneity in the upper crust eruption site on the East Pacific Rise , 9 ø 50 ' N near the 1991
We report the results of a small-aperture uppercrustal tomography experiment conducted on the East Pacific Rise near 9ø50'N, the site of a volcanic eruption in 1991. The experiment geometry comprised 3 ocean bottom seismometers and 491 airgun shots fired in a 16 x 16 km 2 area. Twoand three-dimensional inversions indicate that the average upper crustal velocities, both on and off axis, increase...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 1995
ISSN: 0148-0227
DOI: 10.1029/94jb02125