Chemistry of solutions from the 13°N East Pacific Rise hydrothermal site

Michard, Gil; Albarède, Francis; Michard, A.; Minster, Jean‐François; Charlou, Jean-Luc; Tan, Noel Peter Bengzon

doi:10.1016/0012-821x(84)90169-9

Cited by 230 publications

(70 citation statements)

References 36 publications

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“…Vent fluid data are from Michard et al (1984), Merlivat et al (1987), Von Damm and Bischoff (1987), Campbell et al (1988), Bluth and Ohmoto (1988), Bowers et al (1988), Massoth et al (1989), Butterfield et al (1990), Shanks et al (1995), and Shanks (2001). Seawater data is from Rees et al (1978).…”

Section: Resultsmentioning

confidence: 99%

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

Zeng

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

Zeng

Chen

et al. 2017

Ore Geology Reviews

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“…Metal-emichrnent in some rocks from the upper dyke zone of hole CY1/1A (Figure 9) suggests that the drillcore also intersected a zone of upwelling [Gillis and Robinson, 1991b]. Because modem hydrothermal fluids venting at mid-ocean ridges typically have 87 Sr/86sr ratios close to fresh rock values [Michard et al, 1984], higher ratios in the rocks underlying these mineralized zones suggests reaction with a seawater-dominated solution rather than an oreforming hydrothermal fluid. Alternatively, these higher ratios may also reflect a different evolutionary path for the fluids altering the rocks in these cores than hydrothermal fluids venting at mid-ocean ridges.…”

Section: Fluid Flow and Water/rock Ratiosmentioning

confidence: 99%

Patterns and processes of alteration in the lavas and dykes of the Troodos Ophiolite, Cyprus

Gillis¹,

Robinson²

1990

J. Geophys. Res.

112

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Alteration panenu in the lavas and dykes of the Troodos Ophiolite, Cypnu, record a compte~ ~st~ of axial hydrochennal alteration, crustal aging, and.subsequent uplift ~d c;rnptac~ent of ~e ophiolite. ~1eld mappina shows that distribution of five alteration zooes, each ~ith duunct rruneralog•cal, gcochermcal, and hydroloaic characteristics, is influenced by igneous stratigraphy, st~cture~ a~d the nature a.nd thickness of the overlying aedimenu. Paragenetic aequences of ICCOlldary ~erals indicate .that alteration conditions changed proareasively as the crust cooled and moved o(f~Uls. Along spreading axes, low temperatures ~SO"C) were mainuined by the rapid flow of seawater m and out of the lavas, and .only minimal alteration took place. In contrast, lower water/rock ratios and hlgh~r te.mperarures (>200°C) m the dykes promoted extensive seawater·rock interaction. Althou~~ the sharp rue .m ~perarure between the two reJ.imes generally coincides with the lava-dyke transJUoo, late· stage mtrus1ons or hydrothermal upwellina zooes locally cause high·temperarure alteration to extend upward .into the lavas. As a segment of crust moved off·axis, temperatures remained tow in the lavas and proaress1vety decreased, ~rom. >250" 10 <80"C in the dykes. High permeability in the uppermost lavas led to the downward rruarauon of an oxidati~e alteration front whose thickness and spatial distribution was dependent upon the. rate and nature of sedimentation and, thus, the original seafloor morphology. Although field relations sho.w that alteration has a consistent vertical pattern in Troodos, the alteration zooes are not laterally oonunuous, and the stratigraphic depth of their boundaries varies considerably. IN1ROOUC110NEarly studies of the massive sulfide deposits [Constantinou and Govett, 1973) and alteration patterns within the Troodos ophiolite [Gass and Smewing, 1973) contributed greatly to the development of models for oceanic hydrothermal systems [SpooMr et al., 1977; C haprno.n and SpooMr, 1977] and subseafloor metamorphism [Coleman, 1977]. Subsequent discovery of high-temperature vents at mid-ocean ridges [e.g., Edmond et al., 1979), seamounts [MalaJwff et al., 1982], and back arc basins [Horbie et al., 1986] showed that hydrothermal circulation is a fundamental process in many oceanic environments.Mineralogical and chemical zonations within the Troodos massive sulfide ore deposits indicate that they formed from hydrothermal flu1ds whose compositions were remarkably similar to those venting on the seafloor today [Adamides, 1987;Herzig and Friedrich , 1987;Richards et al., 1989). Fluid compositions in Troodos were buffered by epidosites at conditions similar to those inferred for the root-zones of active systems at mid-ocean ridges [Bowers and Taylor, 1985;Richardson et al., 1987;Schiffman et al., 1987;Schiffman and Smith, 1988;Seyfried et al., 1988;Von Damm, 1988] . Because of these and other similarities, the upflow zones of the Troodos hydrothermal systems are thought to be ancient analogues of modem active systems [Oud...

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“…The sampled 21øN-EPR solutions have a pH in the range 3.3 to 3.8 (25øC measurements) and are saturated only with respect to quartz [Von Datum et al, 1985]. Solutions sampled from 13øN on the EPR also have low pH values: approximately 3.8 to 3.9 for the samples with the smallest component of seawater mixing [Michard et al, 1984].…”

Section: Calculations At High Water-rock Ratiosmentioning

confidence: 99%

An integrated chemical and stable‐isotope model of the origin of Midocean Ridge Hot Spring Systems

Bowers¹,

Taylor²

1985

J. Geophys. Res.

230

119

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Chemical and isotopic changes accompanying seawater-basalt interaction in axial midocean ridge hydrothermal systems are modeled with the aid of chemical equilibria and mass transfer computer programs, incorporating provision for addition and subtraction of a wide-range of reactant and product minerals, as well as cation and oxygen and hydrogen isotopic exchange equilibria. The models involve stepwise introduction of fresh basalt into progressively modified seawater at discrete temperature intervals from 100 ø to 350øC, with an overall water-rock ratio of about 0.5 being constrained by an assumed

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Chemistry of solutions from the 13°N East Pacific Rise hydrothermal site

Cited by 230 publications

References 36 publications

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

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

Patterns and processes of alteration in the lavas and dykes of the Troodos Ophiolite, Cyprus

An integrated chemical and stable‐isotope model of the origin of Midocean Ridge Hot Spring Systems

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