Tracing Ignimbrite Calderas and Provenance in Southern Peru

追踪秘鲁南部的 Ignimbrite 破火山口及其来源

• 批准号: 182563468
• 负责人: Professor Dr. Gerhard Wörner
• 金额: --
• 依托单位: Abteilung Geochemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/182563468?language=en
• 关键词: Tracing; Ignimbrite; Calderas; Provenance; Southern

The Central Andes represent one of the world's largest Miocene ignimbrite provinces. Knowing the location, size and tectonic regime of caldera structures and relating them to the (volume of) associated ignimbrite outflow sheets is important for two fundamental issues: First, the timing, cause, and location of "ignimbrite flare ups" are first-order processes during the evolution of the Central Andean orogen. Second, the volcano-tectonic structures and calderas with shallow intrusive or subvolcanic stocks are often related to mineralization of significant economic value. We plan to use (1) geochemical and isotopic fingerprinting to locate the provenance of ignimbrites, (2) Ar-Ar geochronology for temporal control of correlation of ignimbrites and the location of their caldera sources (3) remote sensing using ASTER SWIR reflectance data and an ASTER- and SRTM-derived DEMs for analysis in ENVI and (4) a DEM-based drainage net analysis to identify caldera structures using "Rivertools". We will concentrate our effort on southern Peru, which is still relatively little studied. However, we will integrate our results with literature data on ignimbrite flare-ups and tectonic evolution from the entire Central Andes in order to present a model for the relation between these flare ups and orogenic evolution.

中央安第斯山脉是世界上最大的中新世褐煤岩省之一。了解火山口构造的位置、大小和构造体制，并将它们与伴生的褐煤流出岩层(体积)联系起来，对于两个基本问题是重要的：第一，“褐煤爆发”的时间、原因和位置是中央安第斯造山带演化过程中的一级过程。其次，火山构造构造和具有浅层侵入岩或次火山岩储量的火山口往往与具有重要经济价值的成矿作用有关。我们计划使用(1)地球化学和同位素指纹技术来确定火山喷口的来源，(2)用Ar-Ar地质年代学来控制火山喷口的相关性和火山口来源的位置，(3)使用ASTER SWIR反射率数据和ASTER和SRTM得到的数字高程模型进行遥感，以便在ENVI中进行分析，以及(4)基于DEM的水系网络分析，以使用“RiverTools”来识别火山口构造。我们将把我们的努力集中在秘鲁南部，那里的研究仍然相对较少。然而，我们将把我们的结果与整个中央安第斯山脉的褐沸石耀斑和构造演化的文献数据结合起来，以便为这些耀斑与造山演化之间的关系提供一个模型。

项目成果

Mapping patterns of mineral alteration in volcanic terrains using ASTER data and field spectrometry in Southern Peru

• DOI: 10.1016/j.jsames.2013.09.011
• 发表时间: 2013-12
• 期刊: Journal of South American Earth Sciences
• 影响因子: 1.8
• 作者: M. Brandmeier;S. Erasmi;Christian T. Hansen;A. Höweling;K. Nitzsche;T. Ohlendorf;M. Mamani;G. Wörner

The origin and crust/mantle mass balance of Central Andean ignimbrite magmatism constrained by oxygen and strontium isotopes and erupted volumes

• DOI: 10.1007/s00410-015-1152-5
• 发表时间: 2015-06-01
• 期刊: CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
• 影响因子: 3.5
• 作者: Freymuth, Heye;Brandmeier, Melanie;Woerner, Gerhard
• 通讯作者: Woerner, Gerhard

Automated recognition of quasi‐planar ignimbrite sheets as paleosurfaces via robust segmentation of digital elevation models: an example from the Central Andes

通过数字高程模型的稳健分割将准平面火凝灰岩片自动识别为古地表：安第斯山脉中部的一个例子

• DOI: 10.1002/esp.3606
• 发表时间: 2014
• 期刊: Earth Surface Processes and Landforms
• 影响因子: 3.3
• 作者: Székely B;Koma S;Karátson D;Dorninger P;Wörner G;Brandmeier M;Nothegger C
• 通讯作者: Nothegger C

Compositional variations of ignimbrite magmas in the Central Andes over the past 26 Ma — A multivariate statistical perspective

过去 26 Ma 中安第斯山脉火凝结岩浆的成分变化 â 多元统计视角

• DOI: 10.1016/j.lithos.2016.07.011
• 发表时间: 2016
• 期刊: Lithos
• 影响因子: 3.5
• 作者: Brandmeier M;Wörner G
• 通讯作者: Wörner G