Documenting Dynamic Accretion in the Lower Ocean Crust: Ocean Drilling Holes U1473A and 735B, SW Indian Ridge

记录下洋地壳的动态吸积：印度洋海岭西南部的大洋钻探 U1473A 和 735B

基本信息

批准号：
1637130
负责人：
Henry Dick
金额：
$ 49.5万
依托单位：
Woods Hole Oceanographic Institution
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-09-01 至 2020-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1637130&HistoricalAwards=false
关键词：
Documenting Dynamic Accretion Lower Ocean

项目摘要

The size, shape, mineralogy, and physical behavior and evolution of magma chambers beneath ocean ridges determine the geochemical, geophysical, hydrothermal, and tectonic characteristics of ocean crust, which forms over 70 percent of Earth's surface (i.e., all that occurring under the sea). To learn more about slow-spread ocean crustal structure, a major community-driven effort to drill deep bore holes into magmatic rocks on the seafloor by the International Ocean Discovery Program and involving more than 30 scientists from around the world, was carried out in 2015-2016 on the Southwest Indian Ridge at a location called the Atlantis Bank. The research that will be carried out under the auspices of this award is divided into two parts. One part consists of creating the foundational geochemical analytical data for over 300 igneous rock specimens of the 789 meter-long core, with the second part involving targeted studies of discrete core intervals to look at the origin of local features. Results of this stratigraphic work will be compared to similar data collected from an ocean drilling core taken 2.2 kilometers away a number of years ago. Broader impacts of the work include strong international collaboration with French, German, Italian, and Chinese scientists, support of a multi-national science program to understand the composition and magmatic section of the seafloor, and the training of two graduate students, one US and one Chinese, with the second being paid for by the Chinese government. Efforts will be made to transmit findings to the public via podcasts and the participation of a professional science communicator.The laboratory part of the research consists of carrying out and creating a geochemical database of whole rock and mineral major and trace element data. Each sample will be examined petrographically to determine mineral and textural relationships and discriminate between primary, secondary, and alteration phases and features. In addition, rare earth element compositions in coexisting plagioclase and pyroxene will be used as geothermometers to develop chemical zoning profiles and thermal histories of the various magmatic bodies within the stratigraphic section. These data will form the basis for the testing of the hypothesis that there is a continuity of igneous process across the Atlantis Bank, reflecting steady-state conditions of emplacement of a core complex. Results of this work can be extrapolated to help us understand other slow-spread crustal areas along the mid-ocean ridges.

海脊下方岩浆房的大小、形状、矿物学以及物理行为和演化决定了海洋地壳的地球化学、地球物理、热液和构造特征，海洋地壳构成了地球表面的 70% 以上（即所有发生在海底的物质））。为了更多地了解缓慢扩散的海洋地壳结构，国际海洋发现计划于 2015 年进行了一项由社区推动的重大项目，在海底岩浆岩中钻深孔，来自世界各地的 30 多名科学家参与其中-2016 年，位于西南印度洋山脊的亚特兰蒂斯浅滩处。在该奖项的支持下将进行的研究分为两部分。第一部分包括为 789 米长岩心的 300 多个火成岩样本创建基础地球化学分析数据，第二部分包括对离散岩心区间进行有针对性的研究，以了解局部特征的起源。这项地层工作的结果将与多年前从 2.2 公里外的海洋钻探岩心收集的类似数据进行比较。这项工作的更广泛影响包括与法国、德国、意大利和中国科学家的强有力的国际合作，支持了解海底成分和岩浆部分的多国科学计划，以及培训两名研究生（一名美国和一名美国科学家）。一名中国人，第二名由中国政府支付费用。将努力通过播客和专业科学传播者的参与向公众传播研究结果。研究的实验室部分包括开展和创建整个岩石和矿物主量元素和微量元素数据的地球化学数据库。每个样品都将进行岩相学检查，以确定矿物和结构关系，并区分原生、次生和蚀变阶段和特征。此外，共存斜长石和辉石中的稀土元素成分将被用作地温计，以开发地层剖面内各种岩浆体的化学分区剖面和热历史。这些数据将构成检验亚特兰蒂斯浅滩火成岩过程连续性这一假设的基础，反映了核心复合体就位的稳态条件。这项工作的结果可以推断，以帮助我们了解洋中脊沿线其他缓慢扩张的地壳区域。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Evidence for Multi-stage Melt Transport in the Lower Ocean Crust: Atlantis Bank Gabbroic Massif (IODP Hole U1473A, SW Indian Ridge)

下洋壳中多阶段熔体迁移的证据：亚特兰蒂斯浅滩辉长岩地块（IODP 孔 U1473A，西南印度洋海岭）

DOI：
10.1093/petrology/egaa082
发表时间：
2020
期刊：
Journal of Petrology
影响因子：
3.9
作者：
Wei-Qi Zhang;Chuan-Zhou Liu;Heny J.B. Dick
通讯作者：
Heny J.B. Dick

Dynamic Accretion Beneath a Slow‐Spreading Ridge Segment: IODP Hole 1473A and the Atlantis Bank Oceanic Core Complex

DOI：
10.1029/2018jb016858
发表时间：
2019-12
期刊：
Journal of Geophysical Research: Solid Earth
影响因子：
0
作者：
H. J. Dick;C. J. MacLeod;P. Blum;N. Abe;D. K. Blackman;J. Bowles;M. Cheadle;K. Cho;
通讯作者：
H. J. Dick;C. J. MacLeod;P. Blum;N. Abe;D. K. Blackman;J. Bowles;M. Cheadle;K. Cho;

The Atlantis Bank Gabbro Massif, Southwest Indian Ridge

DOI：
10.1186/s40645-019-0307-9
发表时间：
2019-11
期刊：
Progress in Earth and Planetary Science
影响因子：
3.9
作者：
H. Dick;A. Kvassnes;P. Robinson;C. MacLeod;H. Kinoshita
通讯作者：
H. Dick;A. Kvassnes;P. Robinson;C. MacLeod;H. Kinoshita

Occurrence of Felsic Rocks in Oceanic Gabbros from IODP Hole U1473A: Implications for Evolved Melt Migration in the Lower Oceanic Crust

DOI：
10.3390/min8120583
发表时间：
2018-12
期刊：
Minerals
影响因子：
2.5
作者：
D. K. Nguyen;T. Morishita;Y. Soda;A. Tamura;B. Ghosh;Y. Harigane;Chuan-Zhou Liu;J. Natland;A. Sanfilippo;C. MacLeod;P. Blum;H. Dick
通讯作者：
D. K. Nguyen;T. Morishita;Y. Soda;A. Tamura;B. Ghosh;Y. Harigane;Chuan-Zhou Liu;J. Natland;A. Sanfilippo;C. MacLeod;P. Blum;H. Dick

Silica‐Rich Vein Formation in an Evolving Stress Field, Atlantis Bank Oceanic Core Complex