EAGER: A Novel Approach to Study Earth's Oldest Environments and Biosphere: Tidal, Shelf, and Deep Ocean Habitats in the >3.7 Ga Isua Greenstone Belt, Greenland

EAGER：一种研究地球上最古老的环境和生物圈的新方法：格陵兰3.7Ga伊苏阿绿岩带的潮汐、陆架和深海栖息地老Dominion大学Nora Noffke EAR-0929617摘要格陵兰伊苏阿绿岩带(IGB)由地球历史上保存下来的3.7Ga最古老的沉积物组成。到目前为止，坚定的教条是，所有IGB岩石都将高度变质，因此地球上的信息-S最古老的古环境和生命起源将被抹去或被如此强烈地掩盖，以至于无法得出确切的结论。这个拟议的项目将打开一个新的视角，证明伊格勃是地球上最深的时间--S的宝贵档案，只需要新开发的方法就能读取这一独特的信息。事实上，皮？S工作组的初步工作指出，伊格勃中可能存在着包括潮汐、陆架和深海在内的各种海洋古环境。该小组开发了一种新的方法来区分变质沉积物中的任何类型的初级旋回(潮汐旋回和米兰科维奇旋回)。基于这些初步但令人震惊的结果，Pi想对这些独特的岩石序列进行探索性研究，并获得适当的数据来证实我们对照片的初步观察。这一结果与科学界目前的知识现状不符。诺夫克将从华盛顿特区前往哥本哈根，然后从那里前往格陵兰的努克。从这里，他们将被直升机运送到研究区本身。访问应在2010年7月中旬至8月中旬进行。就格陵兰岛(北极夏季)的当地天气而言，这是最好的窗口。派将探访IGB的三个露头。准确的位置是从GPS数据中得知的。她将根据她在照片扫描中检测到的潮汐和米兰科维奇旋回来衡量岩石的演替。此外，她还将在实地进行构造地质测量，以了解每个背景的构造框架。这将使她能够在以后了解薄片中的结构结构，并诊断出，如果明显的层理，沉积结构，如波纹交叉层理，是构造的，变质的，甚至是原生成因的。这支队伍将在靠近内陆冰层的田野上露营两周。岩石样本将由GEUS从伊苏阿运往弗吉尼亚州的诺福克。他们将通过勘测大本营乘坐直升机再次返回，然后返回美国。将使用所有3个地点的层理类型和厚度的现场数据进行光谱分析。

EAGER: A novel approach to study Earth's oldest environments and biosphere: Tidal, shelf, and deep ocean habitats in the 3.7 Ga Isua Greenstone Belt, GreenlandNora Noffke, Old Dominion UniversityEAR-0929617ABSTRACTThe Isua Greenstone Belt (IGB), Greenland, comprises the oldest, 3.7 Ga sediments preserved in Earth history. Until now the firm dogma is that all IGB rocks would be highly metamorphosed and therefore information on Earth?s oldest paleoenvironment and the origin of life would be erased or so strongly masked that no firm conclusions can be drawn. This proposed project would open a new perspective by demonstrating that the IGB constitutes a valuable archive on Earth?s deepest time, and that it requires only newly developed methods to read this unique information.Indeed, the preliminary work of the PI?s working group points to the possibility that in the IGB already diverse marine paleoenvironments including a tidal, a shelf, and a deep ocean setting, existed. The team has developed a new method to distinguish any type of primary cyclicity in the meta-sediments (tidal and Milancovic cyclicity). Based on those preliminary yet stunning results, PI would like to conduct an exploratory study on those unique rock successions, and to gain appropriate data to confirm our initial observations on photos. The results are not conforming to the current status quo of knowledge of the scientific community. Noffke would travel from Washington, DC to Copenhagen and from there to Nuuk, Greenland. From here, they would be transported by helicopter to the study area itself. The trip should take place from mid of July to mid of August 2010. This is the best window with respect to the local weather in Greenland (the arctic summer). PI would visit three outcrops in the IGB. The locations are known exactly from GPS data. She would measure the rock successions with respect to the tidal and Milancovic cyclicities that she has detected in photo scans. In addition, she would conduct structural geological measurements in the field to gain an overview into the tectonic frame of each setting. This would allow her to later understand textural structures in thin-sections, and to diagnose, if apparent bedding, sedimentary structures such as ripple cross stratification, are of tectonic, metamorphic or indeed primary origin. The team would camp for 2 weeks in the field close to the inland ice. The rock samples would be shipped by GEUS from Isua to Norfolk, Virginia. They would return again by helicopter via the Survey base camp, and then travel back to the USA. The field data on the type and thickness of the bedding at all 3 locations will be used for spectral analyses.