The boron isotope systematics of the Yellowstone National Park (Wyoming) hydrothermal system: A reconnaissance
The boron isotope systematics of the Yellowstone National Park (Wyoming) hydrothermal system: A reconnaissance
复制标题
DOI：
10.1016/0016-7037(90)90015-d
复制
发表时间：
1990-10
影响因子：
5
通讯作者：
M. Palmer;N. Sturchio
中科院分区：
文献类型：
--
作者：
M. Palmer;N. Sturchio
在怀俄明州黄石国家公园的地热系统中，对14个温泉沃茨、2个钻孔沃茨、1个未改变的流纹岩流和热液改变的流纹岩进行了硼浓度和同位素组成的测量。这些样本代表了公园内的主要热区域，并涵盖了流体类型的范围。对于液体，B浓度范围为0.043-2.69 mM/kg，δ 11 B值范围为-9.3至+4.4%。溶解的B浓度或同位素组成与任何主要元素（除Cl外）的浓度或物理性质之间没有关系。每个盆地的特点是B/Cl比值和δ 11 B值的范围有限。莫里斯盆地、上间歇泉盆地、方解石泉和克利尔沃特的温泉沃茨的δ 11 B值接近于未蚀变流纹岩的δ 11 B值（-5.2%）。并且被解释为从该源获得了它们的B。来自猛犸温泉、Sheepeater和Rainbow Springs的沃茨的δ 11 B值较低，接近-8%。这些较低的值可能反映了B从黄石火山口外的沉积岩中的沥滤，但它们与热液蚀变流纹岩的δ 11 B值（-9.7%）相似。因此，在这些温泉沃茨中记录的轻硼同位素组成可能反映了先前沉积的热液矿物的沥滤。公园边界外黄石河沿岸较冷的泉水沿着有较低的B浓度和较高的δ 11 B值，这可能反映了与浅层大气降水的混合。
Boron concentrations and isotope compositions have been measured in fourteen hot spring waters, two drill hole waters, an unaltered rhyolite flow, and hydrothermally altered rhyolite from the geothermal system in Yellowstone National Park, Wyoming. The samples are representative of the major thermal areas within the park and span the range of fluid types. For the fluids, the B concentrations range from 0.043–2.69 mM/kg, and theδ11B values range from −9.3 to +4.4%.. There is no relationship between the dissolved B concentrations or isotope compositions with the concentration of any major element (other than Cl) or physical property. Each basin is characterized by a restricted range in B/Cl ratios andδ11B values. Hot spring waters from the Morris Basin, Upper Geyser Basin, Calcite Springs, and Clearwater haveδ11B values close to that of unaltered rhyolite (−5.2%.) and are interpreted to have derived their B from this source. Waters from Mammoth Hot Springs, Sheepeater, and Rainbow Springs have lowerδ11B values close to −8%.. These lower values may reflect leaching of B from sedimentary rocks outside the Yellowstone caldera, but they are similar to theδ11B value of hydrothermally altered rhyolite (−9.7%.). Hence, the light boron isotope compositions recorded in these hot spring waters may reflect leaching of previously deposited hydrothermal minerals. Cooler springs along the Yellowstone River just outside the park boundary have lower B concentrations and higherδ11B values that may reflect mixing with shallow meteoric water.