Collaborative Research: Crust-Mantle Interactions at an Oblique Arc-Continent Collision Zone: The SE Caribbean Plate Boundary

0607580Pavlis该奖项将支持将目前获得资金的CD项目(玻利瓦尔)延长两年，该项目正在研究加勒比大陆的沉积过程。具体地说，该项目正在利用各种地质(测绘、构造)、地球化学(Ar-Ar和U-Pb地质年代学)和地震(使用OBS仪器进行陆上/海上记录的主动MCS、无源阵列)技术，调查弧形如何附着在南美洲北部边缘。还有一项地球动力学模型研究，非常创新地包括了地壳-地幔相互作用的动力学。该项目的总体目标是进一步了解世界级的弧陆吸积事件的几何学和年代学。在不同的碰撞时代，计算了几个横跨造山带的断面的地震/地质剖面。调查组包括在主动地震学和被动地震学方面都很有能力的地震学家，以及熟悉陆地造山带发展的地质学家。与委内瑞拉科学家和学生的合作非常好。在委内瑞拉，玻利瓦尔有一个正式的多年对应项目GEODINOS，由委内瑞拉政府地震组织FUNVISIS资助。在FUNVISIS的帮助下，私营部门完成了一项成功的数据采集工作，包括在委内瑞拉大陆和背风安的列斯群岛进行主动和被动陆地-海洋地震实验，以及许多地质/地球化学研究。他们的研究区域大约相当于加利福尼亚州及其大陆边缘的大小，面积超过60万平方公里，并具有同样复杂的中生代晚期-新生代历史。

0607580PavlisThis award will support a two year extension of a currently funded CD project (BOLIVAR) which is investigating the processes of continental accretion in the Caribbean. Specifically, the project is investigating how arcs accrete to the northern edge of south America using various geologic (mapping, structure), geochemical (Ar-Ar and U-Pb Geochronology), and seismic (active MCS with onshore/offshore recording using OBS instruments, passive array) techniques. There is also a geodynamic modeling study that, very innovatively, includes the dynamics of crust-mantle interaction. The overall goal of the project is to understand further the geometry and chronology of a world class, arc-continent accretion event. Seismic/geological cross-sections are being derived for several transects across the orogen at different ages of collision. The group of investigators includes highly capable seismologists in both active and passive seismology, as well as geologists familiar with the orogenic developments on land. The cooperation with Venezuelan scientists and students is excellent. In Venezuela, BOLIVAR has a formal multi-year counterpart, GEODINOS, funded by the Venezuelan government seismological organization FUNVISIS. With FUNVISIS, the PIs have completed a successful data acquisition effort consisting of active and passive land-marine seismic experiments, and numerous geologic/geochemical studies on the Venezuelan mainland and in the Leeward Antilles archipelago. Their study area is about the size of California and its continental margin, an area greater than 600,000 km 2 , and has an equally complex Late Mesozoic-Cenozoic history.