Zircon evidence for a ~200 k.y. supereruption-related thermal flare-up in the Miocene southern Black Mountains, western Arizona, USA

Susanne M. McDowell; Calvin F. Miller; Roland Mundil

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Zircon evidence for a ~200 k.y. supereruption-related thermal flare-up in the Miocene southern Black Mountains, western Arizona, USA

机译：锆石证据表明约200 k.y.美国亚利桑那州西部中新世南部黑山与超喷发有关的热爆发

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The Silver Creek caldera (southern Black Mountains, western Arizona) is the source of the 18.8 Ma, >700km3 Peach Spring Tuff (PST) supereruption, the largest eruption generated in the Colorado River Extensional Corridor (CREC) of the southwestern United States. Within and immediately surrounding the caldera is a sequence of volcanics and intrusions ranging in age from ~ 19 to 17 Ma. These units offer a record of magmatic processes prior to, during, and immediately following the PST eruption. To investigate the thermal evolution of the magmatic center that produced the PST, we applied a combination of Ti-in-zirconthermometry, zircon saturation thermometry, and high-precision U-Pb CA-TIMS zircon dating to representative pre-and post-supereruption volcanic and intrusive units from the caldera and its environs. Similar to intracaldera PST zircons, zircons from a pre-PST trachytic lava (19 Ma) and a post-PST caldera intrusion (18.8 Ma) yield exceptionally high-Ti concentrations (most >20 ppm, some up to nearly 60 ppm), corresponding to calculated temperatures that exceed 900 °C. In these units, Ti-in-zircon temperatures typically surpass zircon saturation temperatures (ZSTs), suggesting the entrainment of zircon that had grown in hotter environments within the magmatic system. Titanium concentrations in younger volcanic and intrusive units (~ 18.7-17.5 Ma) decline through time, corresponding to an average cooling rate of 10"3 5 °C/year. The ~200 k.y. thermal peak evident at Silver Creek caldera is spatially limited: elsewhere in the Miocene record of the northern CREC, Ti-in-zircon concentrations and ZSTs are much lower, suggesting that felsic magmas were generally substantially cooler.

机译：Silver Creek火山口（亚利桑那州南部的黑山南部）是18.8 Ma，> 700km3的桃春凝灰岩（PST）超级喷发的源头，这是美国西南部科罗拉多河延伸走廊（CREC）产生的最大喷发。在火山口内和火山口周围是一系列火山和侵入岩，年龄从19到17 Ma不等。这些单元在PST爆发之前，之中和之后提供岩浆过程的记录。为了研究产生PST的岩浆中心的热演化，我们将Ti-in-锆石热计量法，锆石饱和测温法和高精度U-Pb CA-TIMS锆石法相结合，用于了火山爆发前后的火山爆发。以及破火山口及其周围地区的入侵单位。与火山口内的PST锆石相似，PST之前的trachytic熔岩中的锆石（19 Ma）和PST之后的破火山口中的锆石（18.8 Ma）产生异常高的Ti浓度（大多数> 20 ppm，有些高达近60 ppm），对应计算出的温度超过900°C。在这些单元中，锆石中钛的温度通常会超过锆石饱和温度（ZST），这表明在岩浆系统内较热环境中生长的锆石被夹带。较年轻的火山岩和侵入岩单元（〜18.7-17.5 Ma）中的钛浓度会随时间下降，相当于平均冷却速度为10“ 3 5°C /年。在Silver Creek破火山口中可见的〜200 ky热峰在空间上受到限制：在北部CREC中新世记录的其他地方，锆石中的Ti和ZST含量要低得多，表明长英质岩浆通常要凉得多。

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《Contributions to Mineralogy and Petrology》 |2014年第1期|共21页
作者
Susanne M. McDowell; Calvin F. Miller; Roland Mundil;
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正文语种 eng
中图分类矿物学;岩石学;
关键词
Caldera; Peach Spring Tuff; Zircon; Zircon thermometry; CA-TIMS; Supereruption;

机译：破火山口;桃子凝灰岩;锆石;锆石测温;CA-TIMS;超喷发;

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1. Zircon evidence for a ~200 k.y. supereruption-related thermal flare-up in the Miocene southern Black Mountains, western Arizona, USA [J] . Susanne M. McDowell, Calvin F. Miller, Roland Mundil Contributions to Mineralogy and Petrology . 2014,第1期

机译：锆石证据表明约200 k.y.美国亚利桑那州西部中新世南部黑山与超喷发有关的热爆发
2. "Ages and Hf isotopic compositions of detrital zircons in the Pinal schist, southern Arizona, USA: Provenance, tectonic setting, and evidence for pre-1.7 Ga crust in SW Laurentia" [J] . Bickford M. E., Mueller P. A., Condie K. C., Precambrian Research . 2019,第期

机译：“在亚利桑那州南亚利桑那州的碎屑锆石的年龄和HF同位素组成：出处，构造环境和SW Laurentia前1.7 Pre-1.7 Ga Crul的证据”
3. High-Mg andesites from the Gila Bend Mountains, southwestern Arizona: Evidence for hydrous melting of lithosphere during Miocene extension [J] . Robert Lopez, K. L. Cameron GSA Bulletin . 1997,第7期

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4. Structural Controls of the Black Warrior Blind Geothermal System, Washoe-Churchill Counties, Truckee Range, Northwestern Nevada, USA [C] . Andrew J. Sadowski, James E. Faulds Geothermal Resources Council Annual Meeting . 2016

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Zircon evidence for a ~200 k.y. supereruption-related thermal flare-up in the Miocene southern Black Mountains, western Arizona, USA

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