Miocene to Recent tephrostratigraphy offshore Central America: Evolution, Provenance and Cyclicities

中新世到近海中美洲近海地层学：演化、起源和循环性

基本信息

批准号：
224224830
负责人：
Privatdozent Dr. Steffen Kutterolf
金额：
--
依托单位：
Forschungseinheit Magmatische und Hydrothermale Systeme
依托单位国家：
德国
项目类别：
Infrastructure Priority Programmes
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/224224830?language=en
关键词：
Miocene Recent tephrostratigraphy offshore Central

项目摘要

IODP Expeditions 334 and 344 offshore Costa Rica recovered sediments with numerous marine tephras down to the middle Miocene. Together with the marine tephras of former DSDP and ODP cruises offshore Central America as well as correlative Neogene tephras from on-land an overwhelming data set of major and partly trace elements has been acquired in the last 16 months (995 marine tephras, 282 field tephras). This facilitated first correlation between drill Legs, sites and Holes as well as on-shore tephras. Compilation of data showed that temporal and spatial changes in the marine and on-land tephras occur along the Central American Volcanic Arc (CAVA) within the Neogene, that Cocos Ridge subduction took place at least before 1.8 Ma and is probably accompanied by subduction of Galapgos-like crust in N-Costa Rica before, influencing the arc volcanism in this segment. Furthermore, there is indeed a significant contribution of an explosive phase from the Galapagos Hot Spot within the Miocene marine sediments on the Cocos Ridge. Using our data set we are also able to find hidden volcanic centres along the CAVA and there is the possibility that the longevity of existing volcanic complexes exceed our actual knowledge by far. Referring to our analysed data there are also reasonable evidences for cyclic abundance of explosive volcanism at the CAVA. The detailed elaboration on these topics, together with remaining analysis of trace elements and determination of ages, will lead to a complete tephrochronostratigraphic framework for the Neogen explosive volcanism of Central America and highlight the compositional and temporal relationships between subduction input and arc output along the whole Neogene Central American Volcanic Arc.

IODP Expeditions 334和344个海上哥斯达黎加恢复了沉积物，其中有许多海洋tephras到中新世中期。在过去的16个月中，已收购了前DSDP和ODP巡航海上的海洋Tephras，以及来自陆上的相关新金属Tephras（995 Marine Tephras，282 Field Tephras）。这促进了钻头，遗址和孔以及近岸的Tephras之间的第一个相关性。数据的汇编表明，海洋和陆上tephras的时间和空间变化发生在新金元内的中美洲火山弧（CAVA）沿着中美洲火山弧（CAVA），至少在1.8 ma之前发生了可可岭俯冲，并且可能伴随着n-Costa rica的Galapgos样子脱落，在这种情况下，在这种情况下，在这种情况下进行了这种影响。此外，确实，从可可岭的中新世海洋沉积物中的加拉帕戈斯热点爆炸阶段确实有很大的贡献。使用我们的数据集，我们还能够找到沿Cava的隐藏的火山中心，并且有可能现有的火山综合体的寿命超过了我们迄今为止的实际知识。参考我们的分析数据，也有合理的证据证明了CAVA的爆炸性火山循环丰度。对这些主题的详细阐述，以及对痕量要素的剩余分析和年龄的确定，将为中美洲的新爆炸性火山爆炸性爆炸性火山造成完整的tephrochronostratigraphic框架，并强调沿着整个美国中部美国火山火山燃料的俯冲输入和弧形输出之间的组成和时间关系。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Late Cenozoic tephrostratigraphy offshore the southern Central American Volcanic Arc: 1. Tephra ages and provenance

DOI：
10.1002/2016gc006503
发表时间：
2016-11
期刊：
Geochemistry
影响因子：
3.7
作者：
J. Schindlbeck;S. Kutterolf;A. Freundt;G. Alvarado;K.‐L. Wang;S. Straub;S. Hemming;M. Frische;J. Woodhead
通讯作者：
J. Schindlbeck;S. Kutterolf;A. Freundt;G. Alvarado;K.‐L. Wang;S. Straub;S. Hemming;M. Frische;J. Woodhead

Alkalic marine tephra layers at ODP Site 1241 - Major explosive eruptions from an oceanic volcano in a pre-shield stage?

ODP 站点 1241 的碱性海洋火山灰层 - 处于屏蔽前阶段的海洋火山发生重大爆炸性喷发？