Massive sulfide chimneys from the east pacific rise at 7°24's and 16°43's

Chen

et al. 2017

Ore Geology Reviews

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Section: Resultsmentioning

confidence: 99%

Sulfur and lead isotopic compositions of massive sulfides from deep-sea hydrothermal systems: Implications for ore genesis and fluid circulation

Chen

et al. 2017

Ore Geology Reviews

“…Compared to the Zn-rich hydrothermal sulfides from the EPR (21°N, 13°N, 16°43′S, 7°24´S and 21°50′S), the Southern Explorer Ridge (Juan de Fuca Ridge), and the Lau Basin 11,13,14,23], the hydrothermal sulfide from the EPR near 13°N had higher Au content, lower Co, Ni, Sr, Cs, Ba, Bi, and U contents, and identical Ag, Cr, Mn, Ga, Cd, In, Hg, and Tl contents; the exception was the sample from the henna sulfide-oxidation layer (ep-s-1, Table 3). In addition, the hydrothermal sulfide from EPR near 13°N had far lower Li, Be, V, Zr, Nb, Hf, and Ta content (Table 3), compared to the oceanic crust (Li 10×10 −6 , Be 0.5×10 −6 , V 250×10 −6 , Zr 80×10 −6 , Nb 2.2×10 −6 , Hf 2.5×10 −6 , and Ta 0.3×10 −6 ) [27].…”

Section: Trace-element Constituentsmentioning

confidence: 97%

Elemental and isotopic compositions of the hydrothermal sulfide on the East Pacific Rise near 13°N

Chen

Yin

et al. 2010

Sci. China Earth Sci.

The mineralogical, elemental, and isotopic characteristics of a hydrothermal sulfide sample from one dredge station (12°42.30′N, 103°54.48′W, water depth 2655 m) on the East Pacific Rise near 13°N were analyzed. The hydrothermal sulfide was composed mainly of sphalerite, chalcopyrite, and pyrite and was a Zn-rich sulfide; in layer ep-s-1, goethite formed by secondary oxidation was found. The concentrations of rare elements, such as Li (0.15×10 −6 -0.30×10 −6 ), Be (0.01×10 −6 -0.05×10 −6 ), Zr (73.8×10 −9 -1344×10 −9 ), Nb (8.14×10 −9 -64.7×10 −9 ), Hf (2.54×10 −9 -28.0×10 −9 ), and Ta (0.203×10 −9 -1.21×10 −9 ), were far lower in the hydrothermal sulfide than in the ocean crust, whereas the content of Au was higher and the contents of Co, Ni, Sr, Cs, Ba, Bi, and U were low. The correlations between Zn and Cr, Cd and Ga, Cu and P, P and In (R 2 > 0.8) were positive, whereas those between Zn and Fe, Cu, and Ba (R 2 > 0.8) were distinctly negative. From low-temperature mineral assemblages to high-temperature mineral assemblages, the spatial distributions of dispersive and rare elements (e.g. In, Li, Cs) in the hydrothermal sulfide displayed corresponding variations. The variations observed in some elements (e.g., Cd, Cs, P) are controlled by Zn, Fe, and Cu sulfides, respectively. Seafloor weathering accounts for the enrichment of V, Mn, and rare earth elements (REE) in the henna sulfide-oxidation layer that bears the secondary oxide mineral, leading to identical REE patterns for this layer (ep-s-1) and seawater. Seafloor weathering also distinctly affects the correlations between the element ratios of the hydrothermal sulfide. From high-temperature mineral assemblages to low-temperature mineral assemblages, Fe content and δ 34 S value of the hydrothermal sulfide increase gradually, and Zn content and lead isotopic ratios decrease gradually on the contrary, which indicate the influences of seawater on elements and the sulfur and lead isotopic compositions enhance gradually during the formation of hydrothermal sulfides. variation, element, isotopic composition, hydrothermal sulfide, East Pacific Rise 13ºNCitation:Zeng Z G, Chen D G, Yin X B, et al. Elemental and isotopic compositions of the hydrothermal sulfide on the EastThe history of some submarine hydrothermal activities is recorded in seafloor hydrothermal sulfides. Thus, studies of the structure and the mineral, elemental, and isotopic composition of seafloor hydrothermal sulfides can help us understand the fluid evolution that occurs during the formation of hydrothermal sulfides and to elucidate the characteristics of the interaction between deep fluid and rock as well as the material contributions of seawater, it is one of the important research directions of submarine hydrothermal geology (submarine hydrothermal geology includes hydrothermal geochemistry (objects of study, including vent fluid, hydrothermal plume and subseafloor fluids, etc.), hydrothermal

“…In comparison with the Zn-rich hydrothermal sulfides from the East Pacific Rise (21°N, 13°N, 16°43′S, 7°24′S and 21°50′S), South Explorer Ridge (Juan de Fuca Ridge) and Lau Basin (Cr 3-29 ppm, Mn 48-892 ppm, Co 3-2340 ppm, Ni 1-700 ppm, Ga 18-115 ppm, Sr 5-9962 ppm, Ag 4-280 ppm, Cd 50-1360 ppm, In 1-40 ppm, Cs 2.5-6.6 ppm, Ba 50-900 ppm, Au 0.162-3.344 ppm, Hg 1-31 ppm, Ti 9.2-61.3 ppm, Bi 0.1-5 ppm and U 1.3-3.1 ppm) [19][20][21][22][23][24][25][26]32,33] , the hydrothermal sulfides at Jade site in the Okinawa Trough have higher Ag, Cd, Au, Hg and Bi (except sample HOK1), lower Cr, Co, Ni, Cs, Ti and U, and similar Mn, Sr, Ga, In and Ba contents (except sample HOK1).…”

Section: Trace Element Constituentsmentioning

confidence: 99%

“…In comparison with the major-element compositions of the hydrothermal sulfide from Jade site reported previously (Zn 0.02%-42.83%, Pb 0.27%-25.52%, Cu 0.02%-14.30% and Fe 0.03%-18.83%) [1-3, 37,38] , the hydrothermal sulfide we studied clearly has a higher Zn content. In comparison with the Zn-rich hydrothermal sulfide from the East Pacific Rise (21°N, 13°N, 16°43′S, 7°24′S, 21°50′S), South Explorer Ridge (Juan de Fuca Ridge) and Lau Basin (Zn 9.05%-49.05%, Pb 0.02%-0.69%, Cu 0.10%-12.00% and Fe 11.00%-40.60%) [19][20][21][22][23][24][25][26]32,33] , the Zn and Pb contents are higher and the Fe content is lower. (Table 2).…”

Section: Major Element Constituentsmentioning

confidence: 99%

See 1 more Smart Citation

Element enrichment and U-series isotopic characteristics of the hydrothermal sulfides at Jade site in the Okinawa Trough

Sci. China Ser. D-Earth Sci.

Shao-xiong

Yin

et al. 2009

The geochemical and U-series isotopic characteristics of hydrothermal sulfide samples from the Jade site (127°04.5′E, 27°15′N, water depth 1300-1450 m) at Jade site in the Okinawa Trough were analyzed. In the hydrothermal sulfide samples bearing sulfate (samples HOK1 and HOK2), the LREEs are relatively enriched. All the hydrothermal sulfide samples except HOK1 belong to Zn-rich hydrothermal sulfide. In comparison with Zn-rich hydrothermal sulfides from other fields, the contents of Zn, Pb, Ag, Cd, Au and Hg are higher, the contents of Fe, Al, Cr, Co, Ni, Sr, Te, Cs, Ti and U lower, and the 210 Pb radioactivity ratios and 210 Pb/Pb ratios very low. In the hydrothermal sulfide mainly composed of sphalerite, the correlations between rare elements Hf and U, and Hf and Mn as well as that between dispersive elements Ga and Zn, are strongly positive; also the contents of Au and Ag are related to Fe-sulfide, because the low temperature promotes enrichment of Au and Ag. Meanwhile, the positive correlations between Fe and Bi and between Zn and Cd are not affected by the change of mineral assemblage. Based on the 210 Pb/Pb ratios of hydrothermal sulfide samples (3.99×10 −5 -5.42×10 −5 ), their U isotopic composition ( 238 U content 1.15-2.53 ppm, 238 U activity 1.07-1.87 dpm/g, 234 U activity 1.15-2.09 dpm/g and 234 U/ 238 U ratio 1.07-1.14) and their 232 Th and 230 Th contents are at base level, and the chronological age of hydrothermal sulfide at Jade site in the Okinawa Trough is between 200 and 2000 yr.U-series isotope, Trace-element constituents, hydrothermal sulfide, Jade site, Okinawa Trough Jade site was first discovered on the northeast slope of the Izena Cauldron in the Okinawa Trough by the Deep-tow Ocean Floor Observing System (OFOS) during the "Sonne" SO-56 cruise in July, 1988 [1][2][3] . In August of 1988, by employing the deep-tow system of JAMSTEC and Shinkai 2000 ROV, hundreds of sulfide chimneys (0.1 m to several meters high) were observed at this site [4] .Since then, the mineralogy, geochemistry and fluid inclusions of hydrothermal sulfide at this site have been studied [5][6][7][8][9] . For example, previous studies suggest that the hydrothermal sulfides at this site are mainly composed of Fe-sulfide (pyrite, marcasite), Zn-sulfide (sphalerite, wurtzite), Cu-sulfide (chalcopyrite, isocubanite), cryptocrystalline silicon dioxide, sulfate (anhydrite, barite), Pb-sulfide (galenite, sulfonates), As-sulfide (dimorphine, realgarite), Cu-As-Sb-sulfide, (tennantite,