Tectonic, Climate, and Erosional Controls on Andean Plateau Incision and Width, South Peru

模拟和观测研究得出了这样的假设，即气候引起的侵蚀影响造山带变形的宽度和位置，并塑造造山带地形。然而，以前的研究并不明确，目前的进展受到需要明确的多学科实地观察的阻碍。本文研究了气候对高原边缘切口和大型造山带宽度的影响。更具体地说，本研究的两个组成部分包括：1)量化气候和古气候对中安第斯高原东部边缘（秘鲁和玻利维亚）观测到的空间广泛和高幅度峡谷切口的控制；2)气候对秘鲁南部高原宽度大（~200 km）变化的潜在控制。我建议通过实地考察、低温热年代学、平衡截面和热运动学建模的整合来做到这一点。这些新的观测结果将在构造缩短和现有大气环流古气候模式的背景下进行解释。该提案需要与安第斯构造和地表过程方面的美国和秘鲁领先科学家进行强有力的国际合作，确保项目成功。

Modeling and observational studies have led to the hypothesis that climate-induced erosion influences the width and locus of deformation in orogens and shapes orogen topography. However, previous studies are not unambiguous and current progress is hampered by the need for clear, multidisciplinary field observations. This proposal focuses on the climate controls on plateau margin incision and width of large orogenic plateaus. More specifically, the two components of this research include 1) quantifying the climate and paleoclimate controls on observed spatially extensive and high-magnitude canyon incision in the eastern margin of the Central Andean Plateau (Peru and Bolivia), and 2) potential climate controls on large (~200 km) variations in plateau width in South Peru. I propose to do this through an integration of fieldwork, low-temperature thermochronology, balanced cross-sections, and thermo-kinematic modeling. These new observations will be interpreted in the context of tectonic shortening and existing atmospheric general circulation paleoclimate models. This proposal entails a strong international collaboration with leading US and Peruvian scientists in Andean tectonics and surface processes, assuring project success.