Neotectonics, structural geology, exhumation, zircon U-Pb, K-feldspar Ar-step-heating, apatite fission-track, U/Th-He apatite-zircon thermochronology, thermal and kinematic modeling

安第斯山脉中部隆起作为大气环流的地形屏障是气候模式的重要参数。目前的争论集中在Puna（阿根廷）和Altiplano（玻利维亚）高原生长模式的时空差异上。为了解决这一问题，我们提出了一项更严格的研究，利用锆石U- pb、k -长石ar -阶梯加热、磷灰石裂变径迹、磷灰石和锆石U/Th-He分析和普纳-东科迪勒拉过渡断层限制的火成岩侵入体的结构野外研究，研究普纳的冷却和隆起以及运动学历史。我们重点研究了两个关键地区的10个岩体：(1)普纳环北部（Humahuaca， Tres Cruces地区）和(2)普纳环南部（Sierra de Quilmes, Co. Chuscha）。锆石U- pb、k -长石ar -阶梯加热和锆石U/Th-He的较高闭合温度有助于重建更古老的前新近纪热演化和地热梯度，为随后的新近纪高原生长提供了必要的构造和热条件。磷灰石裂变径迹和磷灰石U/Th-He闭合温度较低，有助于约束新构造史，导致发掘。由此产生的火成岩范围冷却历史的时空差异使我们能够重建整个高原的生长模式，构造分析提供了收缩逆断层模式和隆升结构的几何约束。沿着垂直高程样带的热年代学年龄使我们能够重建挖掘的时间和速率，表明地形障碍的发生年龄和这些障碍背风侧干旱的增加。将普纳高原的结果与高原和其他造山高原的结果进行比较，将有助于更好地了解造山高原的发育方式和速度，以及它们如何诱发气候变化。

Uplift of the Central Andes as a topographic barrier to atmospheric circulation is an important parameter for climate models. Current debate centers an temporal and spatial differences in the growth pattern of the Puna (Argentina) and structurally distinct Altiplano (Bolivia) plateau. We address this problem by proposing a more rigorous study of the cooling and uplift, and kinematic history of the Puna using zircon U-Pb, K-feldspar Ar-step-heating, apatite fission-track, and apatite and zircon U/Th-He analyses and structural Field studies of fault-bound igneous intrusions at the Puna-Eastern Cordillera transition. We focus on 10 selected plutons in 2 key regions: (1) the northern Puna rim (Humahuaca, Tres Cruces region), and (2) the southern Puna rim (Sierra de Quilmes, Co. Chuscha). The higher closure temperatures of zircon U-Pb, K-feldspar Ar-step-heating and zircon U/Th-He allow to reconstruct the older, pre-Neogene thermal evolution and geothermal gradients, which is essential as it provides the structural and thermal conditions for subsequent Neogene plateau growth. The lower closure temperatures of apatite fission-track and apatite U/Th-He help to constrain the neotectonic history leading to exhumation. The resulting spatial and temporal differences in the cooling history of the igneous ranges allow to reconstruct growth patterns across the plateau, and structural analyses provide geometric constraints an contractional reverse-fault patterns and uplift architecture. The thermochronologic ages along the vertical elevation transects enables us to reconstruct the timing and rates of exhumation, indicating the age of onset of topographic barriers and increasing aridity at the lee-side of these barriers. Comparison of the results from the Puna with the Altiplano and other orogenic plateaus will provide a better understanding of how and how fast orogenic plateaus develop, and how they induce climate change.