SGER Award-Exploratory Work in Rondonia - the Laurentia-Amazonia Connection

大多数罗迪尼亚板块重建提出并置的西部亚马逊克拉通与一些部分的3000公里长的格伦维尔边缘劳伦蒂亚。这种联系是基于类似的年龄（约。1.2-0.95 Ga）移动的带。然而，对亚马逊西部地块的变质和构造历史的认识不足，阻碍了对这些劳伦蒂亚-亚马逊配置的测试。 该提案要求提供资金，用于在最近暴露的野外地区进行勘探工作，利用结构绘图、变质岩石学和地质年代学记录西亚马逊克拉通的变形历史。将与巴西地质局合作，对位于亚马孙克拉通边缘的巴西西部朗多尼亚州的两个关键区域进行初步绘图和样品收集。该项目的实验室部分将侧重于压力和温度（P-T）条件和地质年代学（使用40 Ar/39 Ar和U/Pb系统），以确定峰期变质和变形的时间。这些数据将测试一个更大的项目在该地区的可行性，以坚定地了解劳伦特-亚马逊相互作用在晚元古代。

Most Rodinia plate reconstructions propose juxtaposition of the western Amazon craton with some segment of the 3000 km long Grenville margin of Laurentia. This connection is based on linking similarly aged (ca. 1.2-0.95 Ga) mobile belts across ancient continental margins. However, poor understanding of the metamorphic and structural history of the western Amazon block has prevented a test of these Laurentia-Amazonia configurations. This proposal requests funding for exploratory work in recently exposed field areas to document the deformational history of the western Amazon craton using structural mapping, metamorphic petrology and geochronology. Preliminary mapping and sample collecting of twokey regions in the western Brazilian state of Rondonia, located on the margin of the Amazon craton, will be undertaken in collaboration with the Brazilian Geological Service (CPRM). The laboratory portion of this project will focus on pressure and temperature (P-T) conditions and geochronology (using 40Ar/39Ar and U/Pb systems) for the timing of peak metamorphism and deformation. These data will test the feasibility of a larger project in the area toward a firm understanding of Laurentia-Amazonia interactions in lateProterozoic times.