The Eisenhower Range, Transantarctic Mountains: Evaluation of qualitative interpretation concepts of thermochronological data
The Eisenhower Range, Transantarctic Mountains: Evaluation of qualitative interpretation concepts of thermochronological data
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艾森豪威尔山脉、横贯南极山脉：热年代学数据定性解释概念的评估
DOI：
10.1016/j.chemgeo.2013.06.005
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发表时间：
2013
期刊：
影响因子：
3.9
通讯作者：
Spiegel
中科院分区：
文献类型：
--
作者：
Prenzel;Lisker;Balestrieri;Läufer;Spiegel
泛南极山脉（TAM）是磷灰石裂变径迹（AFT）热年代学常规应用于研究折返过程和长期景观演变的第一个地区之一。从该地区的先驱出版物介绍或完善解释概念的热年代学数据，如thebreak在斜坡上的垂直年龄剖面作为定性标志的开始加速rock cooling.New AFT数据汇编从垂直剖面艾森豪威尔岭，北方TAM，并与已发表的数据进行了比较。最初通过群体技术检查的样品通过外部检测器技术重新分析。AFT年龄从海拔220 m的32 ± 2 Ma增加到2380 m的175 ± 14 Ma。AFT数据的地质证据和热历史建模需要侏罗纪至晚始新世样品的再加热和冷却开始于~ 35-30 Ma。这需要在花岗岩基底上沉积一个约3至3.5 km厚的沉积序列，该沉积序列是在约180 Ma的侏罗纪Ferrar岩浆活动之后形成的。古温度对样品高度的回归推断出与裂谷过程和Ferrar岩浆活动有关的高侏罗纪地热梯度约为60 °C/km，以及中等的白垩纪/始新世地热梯度约为30 °C/km。人口和外部检测器技术产生的年龄比较表明，确定每个样品的单颗粒年龄的重要性，即使来自同一侵入体的花岗岩，并因此强烈支持先前为确定退火动力学和晶粒年龄评估所做的情况。年龄比较还表明，以上abreak在slopedrecord人口和外部检测器年龄比以下abreak在slopedreak的样品之间的偏差更大，我们表明，abreak在slopedreak的位置和形状的结果来自各种因素，如热历史之前，最终冷却，最高古温度，冷却速率，地热梯度。斜率的突变不能直接确定最终冷却的开始时间，也不能代替热历史模拟。因此，早期的研究从TAM和类似的设置在其他地方需要验证相结合的热历史建模的热年代学数据和补充的地质信息。
The Transantarctic Mountains (TAM) were one of the first regions where apatite fission track (AFT) thermochronology was applied routinely to study exhumation processes and long term landscape evolution. Pioneering publications from the region introduced or refined interpretation concepts of thermochronological data such as thebreak in slopein vertical age profiles as qualitative marker for the onset of accelerated rock cooling.New AFT data were compiled from vertical profiles in the Eisenhower Range, northern TAM, and compared with published data. Samples originally examined by the population technique were re-analyzed via the external detector technique. AFT ages increase from 32 ± 2 Ma at an elevation of 220 m to 175 ± 14 Ma at 2380 m. Geological evidence and thermal history modeling of the AFT data require Jurassic to Late Eocene reheating of the samples and an onset of cooling at ~ 35–30 Ma. This requires the deposition of an ~ 3 to 3.5 km thick sedimentary sequence on the granitic basement subsequent to Jurassic Ferrar magmatism at ~ 180 Ma. The regression of paleotemperatures against sample altitudes infers a high Jurassic geothermal gradient of ~ 60 °C/km related to rifting processes and Ferrar magmatism, and a moderate Cretaceous/Eocene geothermal gradient of ~ 30 °C/km.Comparison of ages generated with population and external detector technique shows the importance of determining single-grain ages for each sample, even from granitic rocks of the same intrusion, and thus strongly supports previous cases made for the determination of annealing kinetics and grain-age evaluation. Age comparison additionally illustrates that samples above abreak in sloperecord larger deviations between population and external detector ages than samples below abreak in slope.We demonstrate that the position and shape of abreak in sloperesult from various factors, such as the thermal history prior to final cooling, maximum paleotemperatures, cooling rate, and geothermal gradient. Abreak in slopedoes not straightly date the onset of final cooling and cannot substitute thermal history modeling. Therefore, earlier studies from the TAM and similar settings elsewhere need to be validated by combining thermal history modeling of thermochronological data and supplementary geological information.
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