Recent studies have reported slight but definite differences in Δ′17O between the lithosphere and hydrosphere. In present study, we precisely accurately quantify values of geothermal H2O mid-ocean ridge basalt (MORB) with normalization on VSMOW-SLAP scale to further substantiate these discuss isotopic evolution hydrosphere throughout geologic time scale. With a value -60 ± 13 × 10-6, MORB is co...

[1] Tidal signals are observed in numerous time-series measurements obtained from mid-ocean ridge hydrothermal systems. In some instances these tidal signals are clearly the result of ocean currents, but in other instances it appears that the signals may originate in the subseafloor formation. In order to explore the effect of ocean tidal loading on mid-ocean ridge hydrothermal systems, we appl...

The study of ultramafic rocks in Western Yunnan is great significance for an understanding the tectonic evolution Neo-Tethys Ocean. zircon U–Pb data indicated that Santaishan serpentinized pyroxene peridotite (SSPP) was formed 186–190 Ma, and Yingjiang hornblende pyroxenite (YHP) 182–183 Ma. content MgO SSPP relatively high, but SiO2, Al2O3, CaO TiO2 ΣREE are low, while YHP has opposite charact...

The Southwest Indian Ridge is the longest section of very slow to ultraslow-spreading seafloor in the global mid-ocean ridge system, but the biogeography and ecology of its hydrothermal vent fauna are previously unknown. We collected 21 macro- and megafaunal taxa during the first Remotely Operated Vehicle dives to the Longqi vent field at 37° 47'S 49° 39'E, depth 2800 m. Six species are not yet...

Areas of exposed basalt along mid-ocean ridges and at seafloor outcrops serve as conduits of fluid flux into and out of a subsurface ocean, and microbe-mineral interactions can influence alteration reactions at the rock-water interface. Located on the eastern flank of the East Pacific Rise, Dorado Outcrop is a site of low-temperature (<20°C) hydrothermal venting and represents a new end-member ...

The Columbia River Basalt Group in the northwestern United States, comprising about 230,000 cubic kilometres of rock, exhibits unusual patterns in lava distribution, geochemistry and its apparent relationship to regional tectonics. Consequently, there is little consensus on the origin of its magmas. Here, we examine the isotopic ratios of Sr, Nd, Pb and Os and traceelement abundances in Columbi...

The Arctic Mid-Ocean Ridge (AMOR) represents one of the most slow-spreading ridge systems on Earth. Previous attempts to locate hydrothermal vent fields and unravel the nature of venting, as well as the provenance of vent fauna at this northern and insular termination of the global ridge system, have been unsuccessful. Here, we report the first discovery of a black smoker vent field at the AMOR...

Studies of the Fe, Cu, and Zn isotopic compositions volcanic rocks sulfides provide an important tool for understanding magmatic, hydrothermal, alteration processes, thereby enabling determination both transition metal sources quantification petrologic environmental impacts hydrothermal activities. In this study, δ56Fe δ57Fe values mid-ocean ridge basalts (MORBs) are higher than those seafloor ...

Paleocene basaltic lavas exposed on Baffin Island have the highest 3He/4He found in any terrestrial igneous rocks and potentially contain most pristine primordial mantle material Earth's surface. By vacuum-crushing large (1–3 g) olivine mineral separates, we extracted enough magmatic gas to obtain first coupled helium, neon, argon isotopic compositions of lavas. The five samples ranging from 36...

Pygmy angelfishes (genus Centropyge) are widespread and species-rich in the Indo-Pacific, but only three species are recognized in the Atlantic: Centropyge resplendens on the Mid-Atlantic Ridge, Centropyge argi in the Caribbean, and Centropyge aurantonotus in Brazil and the southern Caribbean. Atlantic species are distinguished only by color patterns and are very similar to Centropyge acanthops...