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Periplatform Environments and Sediments of the Maldive

马尔代夫的 Periplatform 环境和沉积物

基本信息

批准号：
9000442
负责人：
Andre Droxler
金额：
--
依托单位：
William Marsh Rice University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1990
资助国家：
美国
起止时间：
1990-07-01 至 1991-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9000442&HistoricalAwards=false
关键词：
Periplatform Environments Sediments Maldive

项目摘要

Drill core samples from ODP Leg 115 demonstrate that aragonite cycles on the Maldives platform mimic changes in oxygen isotope values, and as found elsewhere, probably result from changes in dissolution and detrital input. Furthermore, reconnaisance surveys have revealed that, in contrast to their asymmetry in the Bahamas, prograding clinoforms in the Maldive lagoons respond to the bi-directional, seasonal Asian monsoon. Dr. Droxler has been awarded funds to participate on an international expedition to this area aboard the French vessel Marion Dufresne. Giant piston cores (up to 40 m long), water samples and high resolution echosounding and seismic profiles will be collected. Back in Texas, Dr. Droxler and assistants will conduct preliminary studies including: 1) sedimentologic and isotopic analyses of selected core samples; 2) chemical analyses of hydrocast samples; and 3) processing and interpretation of 1200-1500 km of SCS data. These latter data will be integrated with multichannel seismic reflection data collected in the 1970's by Elf Aquataine and made available to Dr. Droxler by his French colleagues. His research goals are to: 1) match carbonate mineralogy to observed water chemistry; 2) map thicknesses of Holocene sediments to guage offbank transport; 3) measure Pleistocene aragonite cycles and match them to known patterns of platform diagenesis; and 4) determine the response to Pleistocene sea-level changes.

ODP第115航次的岩芯样品表明，马尔代夫台地上的旋回模拟了氧同位素的变化价值观，并在其他地方发现，可能是由于变化，溶解和碎屑输入。此外，侦察调查显示，与他们的不对称相反，巴哈马群岛，马尔代夫泻湖的斜坡对双向的季节性亚洲季风的反应。博士 Droxler已获得资金参与一项乘坐法国船只前往该地区的国际探险队玛丽昂·杜弗兰。巨型活塞岩心（长达40米），水高分辨率回声测深和地震剖面将被收集。回到德克萨斯州，卓克斯勒博士和助手们将进行初步研究，包括：1）沉积学对选定的岩心样品进行同位素分析; 2）化学水力铸造样品分析;和3）加工和 1200-1500 km南海资料的解释。这些数据将与多道地震反射数据相结合 20世纪70年代由Elf Aquataine收集， Droxler博士的法国同事。他的研究目标是 1）将碳酸盐矿物学与观察到的水化学相匹配; 2)绘制全新世沉积物的厚度图，以测量岸外 3）测量更新世文石旋回并匹配它们与已知的台地成岩作用模式;以及4）确定对更新世海平面变化的响应