Clumped-Isotope Geothermometry and Carbonate U-Pb Geochronology of the Alta Stock Metamorphic Aureole, Utah, USA: Insights on the Kinetics of Metamorphism in Carbonates
Clumped-Isotope Geothermometry and Carbonate U-Pb Geochronology of the Alta Stock Metamorphic Aureole, Utah, USA: Insights on the Kinetics of Metamorphism in Carbonates
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DOI：
10.1029/2020gc009238
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发表时间：
2021-04-01
影响因子：
3.5
通讯作者：
Viete, Daniel R.
中科院分区：
文献类型：
--
作者：
Brenner, Dana C.;Passey, Benjamin H.;Viete, Daniel R.
为了评估热和动力学对原子迁移率和矿物（新）结晶的影响，测量了方解石和白云石的团块同位素丰度以及白云石阳离子排序和 U-Pb 日期，跨越 c 内的变质等级。 35-30 Ma Alta 接触变质光环，美国犹他州。变质光环内白云石的平均Delta(47)值反映了白云石从峰值温度冷却过程中的阻塞温度(300℃-350℃)。变质光环外的白云石 Delta(47) 值记录了大约 160 摄氏度的温度。在滑石等梯度处，白云石 Delta(47) 值突然变化，对应于大约 180 摄氏度的下降。
To assess thermal and kinetic influences on atomic mobility and mineral (neo)crystallization, clumped-isotope abundances of calcite and dolomite were measured alongside dolomite cation ordering and U-Pb dates, across metamorphic grade within the c. 35-30 Ma Alta stock contact metamorphic aureole, Utah, USA. Average Delta(47) values of dolomite inside the metamorphic aureole reflect the blocking temperature of dolomite (300 degrees C-350 degrees C) during cooling from peak temperatures. Dolomite Delta(47) values outside the metamorphic aureole record a temperature of similar to 160 degrees C. At the talc isograd, dolomite Delta(47) values abruptly change, corresponding to a decrease of similar to 180 degrees C over