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

该合同将支持目前资助的CD项目（BOLIVAR）的两年延期，该项目正在调查加勒比海大陆增生的过程。具体来说，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（利用OBS仪器、被动阵列进行陆上/海上记录的主动MCS）技术，研究弧如何积聚到南美洲北部边缘。还有一个非常创新的地球动力学建模研究，包括壳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弧-大陆增生事件的几何形状和年表。在不同的碰撞年代，对横跨造山带的几个断面进行了地震/地质剖面的推导。这组调查人员包括在主动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，BOLIVAR有一个正式的多年期对应项目GEODINOS，由委内瑞拉政府地震组织FUNVISIS资助。借助FUNVISIS，石油公司已经成功完成了数据采集工作，包括主动和被动陆地-海洋地震实验，以及委内瑞拉大陆和背风安的列斯群岛的大量地质/地球化学研究。他们的研究区域和加利福尼亚及其大陆边缘差不多大，面积超过60万公里，具有同样复杂的晚中生代-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.