Tephrochronology and Provenance of an Early Pleistocene (Calabrian) Tephra From IODP Expedition 374 Site U1524, Ross Sea (Antarctica)

Tephrochronology and Provenance of an Early Pleistocene (Calabrian) Tephra From IODP Expedition 374 Site U1524, Ross Sea (Antarctica)
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IODP 探险队 374 号地点 U1524(南极洲罗斯海)的早更新世(卡拉布里亚)火山灰的年代学和来源

DOI:
10.1029/2021gc009739
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发表时间:
2021
期刊:
Geochemistry, Geophysics, Geosystems
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通讯作者:
Di Roberto A
Di Roberto A
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作者:
Di Roberto A

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在南极洲罗斯海,国际海洋发现计划(IODP)第374次考察期间,在U1524站点发现了一层20厘米厚的tephra层。研究了单个玻璃碎片上的碲形态、矿物共生以及主要元素和微量元素组成,并对碲晶体上的40ar - 39Ar进行了限制。40ar - 39Ar的数据表明,过量的Ar污染是不同的,基于单晶全熔分析和多晶等分分步加热实验的最佳年龄估计为1.282±0.012 Ma。其特征是具有非常均匀的流纹岩组成和独特的矿物组合,主要是银晶石、石英、少量的暗长石和到达的闪长岩-辉长岩角闪石。U1524遗址的碎屑成分与玛丽伯德地长峰火山山顶破火山口边缘约1.3 Ma的流纹岩浮石沉积物相匹配,距离U1524遗址约1300公里。这一贡献为长峰火山喷发史提供了重要的火山学资料,并为南极西部早更新世海相和陆相记录的定年、对比和同步提供了新的温度年代学标志。
We present a full characterization of a 20 cm‐thick tephra layer found intercalated in the marine sediments recovered at Site U1524 during International Ocean Discovery Program (IODP) Expedition 374, in the Ross Sea, Antarctica. Tephra bedforms, mineral paragenesis, and major‐ and trace‐element composition on individual glass shards were investigated and the tephra age was constrained by40Ar‐39Ar on sanidine crystals. The40Ar‐39Ar data indicate that sanidine grains are variably contaminated by excess Ar, with the best age estimate of 1.282 ± 0.012 Ma, based on both single‐grain total fusion analyses and step‐heating experiments on multi‐grain aliquots. The tephra is characterized by a very homogeneous rhyolitic composition and a peculiar mineral assemblage, dominated by sanidine, quartz, and minor aenigmatite and arfvedsonite‐riebeckite amphiboles. The tephra from Site U1524 compositionally matches with a ca. 1.3 Ma, rhyolitic pumice fall deposit on the rim of the Chang Peak volcano summit caldera, in the Marie Byrd Land, located ca. 1,300 km from Site U1524. This contribution offers important volcanological data on the eruptive history of Chang Peak volcano and adds a new tephrochronologic marker for the dating, correlation, and synchronization of marine and continental early Pleistocene records of West Antarctica.
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