Collaborative Research: Quantifying Rates of Neoproterozoic Global Change, Ethiopia

合作研究：新元古代全球变化的量化速率，埃塞俄比亚，普林斯顿大学亚当·马卢夫著，EAR-1323158，Nicholas Swanson-Hysell，大学。加利福尼亚，伯克利，EAR-1325230虽然碳和锶同位素、磁性地层和古生物记录存在于新元古代早期，是世界各地地层剖面对比的主要基础，但放射性校准是有限的。大多数适合开发化学地层数据的碳酸盐台地都是在远离火山爆发活动的被动边缘上发育的，火山活动可能会将富含锆石的火山灰带到盆地。埃塞俄比亚北部的坦比恩群是解决这一问题的理想之选，因为它是一个厚厚的含碳酸盐岩系，沉积在活火山活动附近的弧后盆地中。我们将开发埃塞俄比亚北部坦比恩群的综合化学地层学、古地磁学和U-Pb年代学数据，为低温冰川作用(~820-720 Ma)前1亿年的地层对比提供新的支柱。我们的首要目标是了解潜在独特的地球化学和古地理边界条件是如何以及何时形成的，这些边界条件允许在寒武纪开始时发生全球冰川作用。这笔赠款得到了国际科学和工程部的共同支持。

Collaborative Research: Quantifying Rates of Neoproterozoic Global Change, EthiopiaByAdam Maloof, Princeton University, EAR-1323158Nicholas Swanson-Hysell, Univ. California, Berkeley, EAR-1325230ABSTRACTWhile carbon and strontium isotope, magnetostratigraphic, and paleontological records exist for the early Neoproterozoic Era, and are the primary bases for correlation of stratigraphic sections around the world, radiometric calibration is limited. Most carbonate platforms well-suited for the development of chemostratigraphic data are developed on passive margins far from explosive volcanic activity that might deliver zircon-rich ash to the basin. The Tambien Group of northern Ethiopia is ideal for solving this problem because it is a thick carbonate-containing succession deposited in a back-arc basin proximal to active volcanism. We will develop integrated chemostratigraphic, paleomagnetic and U-Pb geochronological data from the Tambien Group of northern Ethiopia to provide a new backbone for stratigraphic correlation in the 100 million years preceding Cryogenian glaciation (~820-720 Ma). Our overarching goal is to understand how and when potentially unique geochemical and paleogeographic boundary conditions were developed that allowed for global glaciation at the onset of the Cryogenian Period. This grant was jointly supported by the International Science and Engineering Division.