In 2016, temperature recorders were recovered, temperatures were measured, and fluid samples were collected from Vent 1, a high temperature (338°C) hydrothermal discharge site on the southern Cleft Segment of the Juan de Fuca Ridge. Coupled with previous sampling efforts, this collection represents a 32‐year record of discharge from a single chimney structure, the longest record to date. Remarkably, the fluid has remained brine‐dominated for more than three decades. This brine formed during phase separation and segregation prior to initial observations in 1984. Although the chloride concentration of the discharging fluid has decreased with time, the fluid temperature has remained nearly constant for at least 3.3 years and probably for 15 or even 22 years. Compositions of the discharging fluids are consistent with inputs from a deep‐sourced brine, which was last equilibrated at >400°C at a depth consistent with the base of the sheeted dikes and the brittle‐ductile transition. This brine mixed (diffusion or dispersion) with a likely non‐phase‐separated, hydrothermal fluid prior to discharge. A survey of hydrothermal endmember fluids with chlorinities in excess of 700 mmol/kg shows, with the exception of Fe, a single trend between major ion concentrations and chlorinity even though data are from a range of crustal compositions, spreading rates, and water and magma depths. Calculated deep‐sourced brines from hydrothermal fluid data are similar to data based on fluid inclusions and estimates of brine assimilation in magmas. A better understanding of brines is required given their potential duration of discharge and capacity for mobilizing metals.

中文翻译：

---

将盐水输入转换为热液：南部C裂段，胡安·德富卡岭

2016年，恢复了温度记录器，测量了温度，并从了胡安·德·富卡山脊南半left裂段高温（338°C）水热排放站1号通风孔中收集了流体样本。加上以前的采样工作，此收集代表了单个烟囱结构排放的32年记录，是迄今为止最长的记录。值得注意的是，这种流体在盐水中占主导地位已有三十多年了。这种盐水是在1984年首次观测之前在相分离和分离过程中形成的。尽管排出液中的氯化物浓度随时间降低，但液温至少在3.3年内几乎保持恒定，甚至可能保持15年甚至22年。排出液的成分与深来源盐水的输入一致，最后在> 400°C的温度下平衡，其深度与片状堤基和脆性-延性转变相一致。在排放之前，该盐水与可能的非相分离的热液混合（扩散或分散）。对含氯量超过700 mmol / kg的热液末段流体的调查显示，除Fe以外，即使数据来自各种地壳成分，扩散速率以及水和岩浆，但主要离子浓度和含氯量之间只有一个趋势。深度。根据热液流体数据计算得到的深层盐水类似于基于流体包裹体的数据以及岩浆中盐水同化的估计。考虑到盐水的潜在放电持续时间和动员金属的能力，需要对盐水有更好的了解。400°C，深度与薄片堤坝的底部和脆性-延性转变相一致。在排放之前，该盐水与可能的非相分离的热液混合（扩散或分散）。对含氯量超过700 mmol / kg的热液末段流体的调查显示，除Fe以外，即使数据来自各种地壳成分，扩散速率以及水和岩浆，但主要离子浓度和含氯量之间只有一个趋势。深度。根据热液流体数据计算得到的深层盐水类似于基于流体包裹体的数据以及岩浆中盐水同化的估计。考虑到盐水的潜在放电持续时间和动员金属的能力，需要对盐水有更好的了解。400°C，深度与薄片堤坝的底部和脆性-延性转变相一致。在排放之前，该盐水与可能的非相分离的热液混合（扩散或分散）。对含氯量超过700 mmol / kg的热液末段流体的调查显示，除Fe以外，即使数据来自各种地壳成分，扩散速率以及水和岩浆，但主要离子浓度和含氯量之间只有一个趋势。深度。根据热液流体数据计算得到的深层盐水类似于基于流体包裹体的数据以及岩浆中盐水同化的估计。考虑到盐水的潜在放电持续时间和动员金属的能力，需要对盐水有更好的了解。