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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Geochemical fingerprinting of Wilson Creek formation tephra layers (Mono Basin, California) using titanomagnetite compositions
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Geochemical fingerprinting of Wilson Creek formation tephra layers (Mono Basin, California) using titanomagnetite compositions

机译：使用钛磁铁矿成分对威尔逊溪地层特菲拉层（加利福尼亚州莫诺盆地）的地球化学指纹图谱

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摘要

Nineteen tephra layers within the Wilson Creek formation near Mono Lake provide a record of late Pleistocene to early Holocene volcanic activity from the nearby Mono Craters and are important chronostratigraphic markers for paleomagnetic paleoclimatic, and paleoecologic studies. These stratigraphically important tephra deposits can be geochemically identified using compositions of their titanomagnetite phenocrysts. Titanomagnetite compositions display a broad range (X_(Usp) 0.26-039), which allow the tephra layers to be distinguished despite the indistinguishable major-element glass compositions (76-77 wt% S1O_2) of their hosts. The concentrations of Ti and Fe in titanomagnetite display geochemical and stratigraphic groupings that allow dear discrimination between older (＞57 ka) and younger (＜41 ka) tephras. Some individual tephra layers can be uniquely identified on the basis of titanomagnetite MgO, MnO, and A1_2O_3 contents. In addition, a few tephra layers can be correlated to their source vents by their titanomagnetite compositions. The unique geochemical fingerprint of the Mono Craters-sourced titanomagnetites also allows the discrimination of two tephra layers apparently sourced from nearby Mammoth Mountain volcano in Long Valley.
机译：莫诺湖附近的威尔逊溪地层内的19个特弗拉层记录了附近莫诺火山口的晚更新世至全新世早期火山活动的记录，并且是古磁古气候和古生态研究的重要地层标记。这些地层重要的特非拉沉积物可以使用其钛磁铁矿斑晶的成分进行地球化学鉴定。钛磁铁矿组合物表现出宽范围（X_（Usp）0.26-039），尽管其主体的主元素玻璃组合物（76-77 wt％SlO_2）不可区分，但仍可区分特弗拉层。钛磁铁矿中的Ti和Fe浓度显示出地球化学和地层学分组，从而可以区分出年龄较大的（＞ 57 ka）和年龄较小的（＜41 ka）特非拉斯。可以根据钛磁铁矿中MgO，MnO和Al_2O_3的含量来唯一地识别某些单独的特弗拉层。另外，通过其钛磁铁矿成分，一些特非拉层可以与其源排放口相关。源自Mono Craters的钛磁铁矿的独特地球化学指纹图谱还可以区分两个明显来自长谷猛Ma象山火山的提菲拉层。

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