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首页> 外文期刊>Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society >Influences of the Tonga Subduction Zone on seafloor massive sulfide deposits along the Eastern Lau Spreading Center and Valu Fa Ridge
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Influences of the Tonga Subduction Zone on seafloor massive sulfide deposits along the Eastern Lau Spreading Center and Valu Fa Ridge

机译：汤加俯冲区沿东部滦扩散中心海底硫化物沉积物的影响及大岭

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摘要

This study investigates the morphology, mineralogy, and geochemistry of seafloor massive sulfide (SMS) deposits from six back-arc hydrothermal vent fields along the Eastern Lau Spreading Center (ELSC) and Valu Fa Ridge (VFR) in the context of endmember vent fluid chemistry and proximity to the Tonga Subduction Zone. To complement deposit geochemistry, vent fluid analyses of Cu, Zn, Ba, Pb and H-2,(aq) were completed to supplement existing data and enable thermodynamic calculations of mineral saturation states at in situ conditions. Results document southward increases in the abundance of mantle-incompatible elements in hydrothermal fluids (Ba and Pb) and SMS deposits (Ba, Pb, As, and Sb), which is also expressed in the abundance of barite (BaSO4) and galena (PbS) in SMS deposits. These increases correspond to a decrease in distance between the ELSC/VFR and the Tonga Subduction Zone that correlates with a change in crustal lithology from back-arc basin basalt in the north to mixed andesite, rhyolite, and dacite in the south. Barite influences deposit morphology, contributing to the formation of horizontal flanges and squat terraces. Results are also consistent with a regional-scale lowering of hydrothermal reaction zone temperatures from north to south (except at the southernmost Mariner vent field) that leads to lower-temperature, higher-pH vent fluids relative to mid-ocean ridges of similar spreading rates (Mottl et al., 2011). These All rights reserved.fluids are Cu-and Zn-poor and the deposits formed from these fluids are Cu-poor but Zn-rich. In contrast, at the Mariner vent field, higher-temperature and lower pH vent fluids are hypothesized to result from higher reaction zone temperatures and the localized addition of acidic magmatic volatiles (Mottl et al., 2011). The Mariner fluids are Cu-and Zn-rich and vent from SMS deposits that are rich in Cu but poor in Zn with moderate amounts of Pb. Thermodynamic calculations indicate that the contrasting metal contents
机译：本研究研究了沿着东部Lau扩散中心（ELSC）的六个后弧热水通气场（ELSC）和VIAS FA RIDGE（VFR）的六弧水热通风口（ELSC）沉积的形态，矿物学和地球化学，以及在终结液化学的背景下和接近汤加俯冲区。为了补充地球化学，完成Cu，Zn，Ba，Pb和H-2，（aq）的通气流体分析，以补充现有数据，并在原位条件下实现矿物饱和状态的热力学计算。结果文件南方的水热流体（BA和Pb）和SMS沉积物（BA，Pb，As和Sb）中的披露元素的丰度增加，这也以大小的重晶石（Baso4）和Galena（PBS）表示（PBS ）在短信沉积物中。这些增加对应于ELSC / VFR和汤加俯冲区之间的距离减小，这些距离与北方的后弧盆地玄武岩中的地壳岩石变化相关，南方的混合钻石，流纹岩和牙酮。重晶石影响沉积形态，有助于形成水平法兰和蹲梯田。结果也与北部到南部的水热反应区温度的区域规模降低（在最南端的水手通风领域除外），导致较低温度，相对于类似扩散速率的中海脊的高pH排气流体（Mottl等，2011）。这些版权所有的所有权利.Fluids是Cu-and Zn-od，由这些流体形成的沉积物是Cu-差但富含锌。相反，在水手通气场，假设高温和更低的pH排气流体，以产生较高的反应区温度和酸性岩浆挥发物的局部添加（Mottl等，2011）。水手流体是富含Cu的Cu-and Zn和Zn的富含SMS沉积物，但在Zn中较差，具有中等量的Pb。热力学计算表明对比金属含量

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