US-Colombia Cooperative Research: Geological Evolution of the Amaga Basin, Cauca Valley Colombian Andes

0003708麦克唐纳宾汉普顿纽约州立大学的威廉·麦克唐纳博士和哥伦比亚安蒂奥基亚埃菲特大学的格洛丽亚玛丽亚·塞拉博士之间的这一美国-哥伦比亚合作研究项目提议调查北方安第斯山脉的安第斯地堑北端的早新生代阿马加盆地的演化，重点是始新世阿马加组的磁性特征及其在解释沉积和构造过程中的应用。 其目的是改善地层对比，解释沉积物流动方向，并解释这些碎屑大陆沉积物的磁性成分来源，特别是将对盆地周围几个剖面的样品进行磁极性地层学、磁性各向异性磁化率变化和重矿物分析。 这些数据将与来自其他专家的数据相结合，以解释阿马加盆地的沉积事件，这将有助于深入了解邻近盆地两侧的中部和西部科迪勒拉山脉的构造事件。 它们也将有助于解释沿着盆地边缘的边界断层沿着的运动。这项研究的一个实际方面涉及煤炭矿床和伴生煤气的分布：对地层学的进一步了解将有助于估计资源以及勘探和回收这些对当地经济很重要的资源。

0003708MacDonaldThis US-Colombia collaborative research project between Dr. William MacDonald, SUNY, Binghampton and Dr. Gloria Maria Sierra, Eafit University, Antioquia, Colombia, proposes to investigate the evolution of the early Cenozoic Amaga Basin at the north end of the Interandean Graben of the northern Andes, with emphasis on magnetic characteristics of the Eocene Amaga formation and their uses in interpreting sedimentary and tectonic processes. The objectives are to improve stratigraphic correlation, to decipher sediment flow directions, and to interpret sources of magnetic components of these clastic continental sediments.In particular, magnetic polarity stratigraphy, variation of magnetic anisotropic susceptibility, and analysis of heavy minerals, will be undertaken from samples from several sections around the basin. These data will be integrated with those from other specialists to interpret sedimentary events in the Amaga Basin that will provide insights into tectonic events in the adjacent Central and Western Cordilleras bounding the basin on either side. They will also be helpful in deciphering movements along the bounding faults along the basin margins. A practical aspect of the study involves the distribution of coal deposits and associated coal-gas: an improved knowledge of the stratigraphy will help in estimating resources and in exploration and recovery of these resources which are important to the local economy.