Radiocarbon Dating of Silica Sinter and Postglacial Hydrothermal Activity in the El Tatio Geyser Field

Radiocarbon Dating of Silica Sinter and Postglacial Hydrothermal Activity in the El Tatio Geyser Field
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El Tatio 间歇泉区二氧化硅烧结体和冰后热液活动的放射性碳测年

DOI:
10.1029/2020gl087908
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发表时间:
2020
影响因子:
5.2
通讯作者:
Morata, Diego
Morata, Diego
中科院分区:
地球科学1区
文献类型:
--
作者:
Munoz‐Saez, Carolina;Manga, Michael;Hurwitz, Shaul;Slagter, Silvina;Churchill, Dakota M.;Reich, Martin;Damby, David;Morata, Diego

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智利高原的El Tatio地热田含有覆盖在冰川和火山单元之上的热液二氧化硅烧结矿,为在绝对年代学稀少的地区限制冰川消融和火山活动的时间提供了机会。我们获得了51个新的放射性碳年龄和13C值,这些有机物质捕获在这些烧结矿床中。根据δ13C值,我们排除了29个样本,以确定是否可能受到含有旧碳的细菌垫的污染。我们推断,热液活动始于约27亿年前,此后几乎一直持续。最古老的烧结矿矿床的年龄与最近一次冰川消融后稳定下来的冰川时代重合。晚更新世烧结矿广泛分布于野外,而全新世矿床则分布在活动的热液地貌周围。尽管El Tatio附近没有最近的火山活动,但持续的热液喷发意味着一个长期的岩浆热源。
The El Tatio geothermal field in the Chilean Altiplano contains hydrothermal silica sinter deposits overlaying glacial and volcanic units, providing an opportunity to constrain the timing of deglaciation and volcanic activity in an area with sparse absolute chronologies. We obtained 51 new radiocarbon ages and13C values on the organic material trapped in these sinter deposits. Based on the δ13C values, we exclude 29 samples for possible contamination with bacterial mats that incorporate old carbon. We infer that hydrothermal activity initiated ~27 ka ago and has been nearly continuous ever since. The ages of the oldest sinter deposits coincide with ages of moraines that stabilized after the most recent deglaciation. Whereas late Pleistocene sinters are broadly distributed in the field, Holocene deposits are found around active hydrothermal features. Although recent volcanism is absent in the vicinity of El Tatio, persistent hydrothermal discharge implies a long‐lived magmatic heat source.
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