SGER: IODP Site Survey participation YK-0905, Tectonic and petrologic evolution of Godzilla Mullion

SGER：IODP 现场调查参与 YK-0905，哥斯拉竖框的构造和岩石演化

• 批准号: 0914708
• 负责人: Jonathan Snow
• 金额: $ 0.68万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-05-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0914708&HistoricalAwards=false
• 关键词: SGER; IODP; Site; Survey; participation

Low angle detachment faulting can initiate crustal accretion at slowly spreading magma-starved ridges, producing structures known as Ocean Core Complexes (OCC). The OCC in the Parece Vela Rift (PVR) is one of the largest known and formed in a magma-starved backarc basin. These unique features at PVR provide relatively easy access to the lower crust and upper mantle of the oceanic backarc. The primary objective of this study will be obtaining preliminary data on the nature of the footwall block beneath the detachment surface. The research will advance the understanding of core-complex style ocean crustal formation, offering comparisons with that observed in the Atlantic and Indian Oceans. This type of crustal formation is poorly understood and can not be easily predicted using existing ophiolite models of ocean crust genesis. Consequently, investigations of OCC can be best achieved through direct ocean floor observation as planned for this cruise. Broader impacts:This project provides a strong international collaboration between US and Japanese scientists and thus promotes the cross scientific exchange within the greater IODP community. It may serve as an important site survey for IODP proposal 640-Full that is currently under consideration. It involves 2 US scientists and 2 students from two universities. The project will assist the research of two graduate students, and provide them a hands-on opportunity for sample collection and direct exchange with an international team of scientists. It also provides modest summer support for one of the students.

低角度滑脱断层可以在缓慢扩张的缺乏岩浆的山脊处引发地壳增生，产生被称为海洋核心复合体（OCC）的结构。帕雷塞维拉裂谷 (PVR) 中的 OCC 是已知最大的 OCC 之一，形成于缺乏岩浆的弧后盆地中。 PVR 的这些独特特征为进入大洋弧后的下地壳和上地幔提供了相对容易的途径。本研究的主要目的是获得有关脱离面下方下盘块体性质的初步数据。该研究将增进对核心复合体型海洋地壳形成的理解，并与在大西洋和印度洋观察到的情况进行比较。人们对这种类型的地壳形成知之甚少，并且无法使用现有的海洋地壳成因蛇绿岩模型轻松预测。因此，按照本次巡航计划，通过直接海底观测可以最好地完成 OCC 调查。更广泛的影响：该项目为美国和日本科学家之间提供了强有力的国际合作，从而促进了更大的 IODP 社区内的跨科学交流。它可以作为目前正在考虑的 IODP 提案 640-Full 的重要现场调查。它涉及2名美国科学家和2名来自两所大学的学生。该项目将协助两名研究生的研究，并为他们提供样本采集和与国际科学家团队直接交流的实践机会。 它还为其中一名学生提供适度的暑期支持。