Color atlas of low-temperature alteration features in basalts from the Southern East Pacific Rise
نویسندگان
چکیده
منابع مشابه
Seismicity at the southern East Pacific Rise from recordings of an ocean bottom seismometer array
[1] Seismic data recorded by ocean bottom seismometers (OBSs) at the southern East Pacific Rise (SEPR) were analyzed to characterize seismicity at fast spreading mid-ocean ridges. An automated event detection algorithm based on pattern recognition was developed to identify earthquake-generated T phases. The waveform cross-correlation and least squares method was found to provide more robust est...
متن کاملMantle discontinuity structure beneath the southern east pacific rise from P-to-S converted phases
Receiver functions derived from teleseismic body waves recorded by ocean-bottom seismometers on the southern East Pacific Rise reveal shear waves converted from compressional waves at the mantle discontinuities near 410- and 660-kilometer depth. The thickness of the mantle transition zone between the two discontinuities is normal relative to the global average and indicates that upwelling benea...
متن کاملBasaltic lava domes, lava lakes, and volcanic segmentation on the southern East Pacific Rise
Meter-scale DSL-120 sonar mapping and coregistered Argo II photographic observations reveal changes in eruptive style that closely follow the third-order structural segmentation of the ridge axis on the southern East Pacific Rise, 17°11’-18°37’S. Near segment ends we observe abundant basaltic lava domes which average 20 m in height and 200 m in basal diameter and have pillow lava as the dominan...
متن کاملStauromedusan populations inhabiting deep-sea hydrothermal vents along the southern East Pacific Rise
Dense populations of “stalked jellyfish” (Stauromedusae) were encountered at two geographically-separated, deep-sea hydrothermal vent fields located at 7°26’S; and 20°02’S along the East Pacific Rise (EPR). DSV Alvin was utilized (on dives 3320 and 3334) at the sites to collect numerous stauromedusans, which were immediately frozen (at -70°C) or preserved in 70% ethanol upon arrival on board th...
متن کاملLow temperature aqueous alteration of basalt: Mineral assemblages of Deccan basalts and implications for Mars
[1] Al-rich phyllosilicates (kaolinite, montmorillonite) have been found in layers overlying Fe/Mg-smectites on Mars, and it has been suggested that this stratigraphy formed through in situ leaching at the surface, similar to terrestrial weathering profiles. We are investigating the remotely sensed signatures of this type of weathering using ten samples from a vertical section of altered Deccan...
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ژورنال
عنوان ژورنال: Geochemistry, Geophysics, Geosystems
سال: 2004
ISSN: 1525-2027
DOI: 10.1029/2003gc000665