ULTRA - Ultramafic-hosted mineral Resource Assessment
ULTRA - 超镁铁质托管的矿产资源评估
基本信息
- 批准号:NE/S004300/1
- 负责人:
- 金额:$ 42.08万
- 依托单位:
- 依托单位国家:英国
- 项目类别:Research Grant
- 财政年份:2020
- 资助国家:英国
- 起止时间:2020 至 无数据
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Summary: Hydrothermal seafloor massive sulphide (SMS) deposits on mid-ocean ridges (MOR) are paradoxical; their size seems to be inverse to the amount of volcanic activity. While hydrothermal SMS are more frequent at fast-spreading MOR, the largest deposits occur where volcanism appears to be a minimum. Here, at so-called amagmatic segments on slow- and ultra-slow spreading ridges, ultramafic rocks from the lower-crust and upper-mantle are exhumed by long-lived faulting; a process that is thought to affect 50% of the length of slow-spreading ridges. Ultramafic-hosted seafloor massive sulphides (muSMS) in these settings form some of the largest deposits known, hosting high metal concentrations of Au, Cu, Ni, E-tech elements (Co, Pt). Whereas the magmatic driving force for volcanic-hosted SMS deposits is well established, it remains contentious for the muSMS. Similarly, while there are models for the sub-surface structure and extent of volcanic-hosted SMS, little is known about muSMS. For some muSMS, vent fluid chemistry indicates the potential for extensive sub-seafloor metal precipitation, possibly by interaction with pH barriers due to serpentinisation of the host rock. Furthermore, the physical, chemical and microbial mechanisms affecting muSMS after their formation are poorly constrained. Our study aims to test the hypothesis that muSMS deposits form extensive sub-surface mineralization and undergo significant post-formational modification at and beneath the seafloor under the influence of highly variable pH conditions as a result of interaction with ultramafic rocks and during serpentinisation. Our plan is to combine novel geophysical techniques (electromagnetic induction and inverted down-hole seismic tomography) with surface mapping and sub-seafloor drilling (recovering host rocks, sulphides, sediment and fluids) to image the 3D structure and composition of the deposit and its surroundings. The mineralogy, geochemistry and isotope signatures of the samples will reveal the paragenetic history of the deposits including formation, recrystallization, metal mobilisation, alteration and penetration by seawater. Hydrothermal fluid samples will reveal the nature of the heat source driving deposit formation and host-rock interactions and, combined with studies of metaliferous sediment, constrain metal mobility during later alteration. Ages of these processes will be constrained by radiometric dating. Rates of processes will be constrained by in situ and lab-based, abiotic oxidation and microbial alteration experiments. We will draw these observations together using physiochemical numerical modelling to construct a coherent understanding of the formation and preservation of these large polymetallic muSMS deposits in todays-oceans. Our approach requires two cruises the largest known and best characterised muSMS field at 13degree30minuteN, Mid-Atlantic Ridge (MAR). Despite being technically ambitious, our experience from the EU-funded Blue Mining project and the involvement of both academic and industrial partners, contributing in-kind data and costs, significantly de-risks the research.
摘要:大洋中脊 (MOR) 上的热液海底块状硫化物 (SMS) 沉积物是矛盾的;它们的大小似乎与火山活动的强度成反比。虽然热液 SMS 在快速扩散的 MOR 中更为频繁,但最大的沉积物出现在火山活动似乎最小的地方。在这里,在慢速和超慢速扩张脊上的所谓非岩浆段,来自下地壳和上地幔的超镁铁质岩石通过长期断层作用被挖掘出来。这一过程被认为会影响缓慢扩张的山脊 50% 的长度。这些环境中的超镁铁质海底块状硫化物 (muSMS) 形成了一些已知最大的矿床,含有高浓度的金、铜、镍、电子技术元素(Co、Pt)。尽管火山SMS矿床的岩浆驱动力已得到充分证实,但对于muSMS矿床仍然存在争议。同样,虽然存在火山托管 SMS 的地下结构和范围的模型,但人们对 muSMS 知之甚少。对于一些 muSMS,喷口流体化学表明存在大量海底金属沉淀的可能性,这可能是由于主岩蛇纹石化与 pH 屏障相互作用所致。此外,影响 muSMS 形成后的物理、化学和微生物机制很少受到限制。我们的研究旨在检验这样的假设:muSMS 沉积物形成广泛的地下矿化,并在由于与超镁铁岩相互作用和蛇纹石化过程中 pH 条件高度变化的影响下,在海底及其下方经历了显着的形成后改变。我们的计划是将新型地球物理技术(电磁感应和倒置井下地震层析成像)与地表测绘和海底钻探(回收主岩、硫化物、沉积物和流体)相结合,对矿床及其周围环境的 3D 结构和成分进行成像。样品的矿物学、地球化学和同位素特征将揭示矿床的共生历史,包括形成、重结晶、金属迁移、蚀变和海水渗透。热液样品将揭示驱动沉积物形成的热源的性质以及母岩相互作用,并结合含金属沉积物的研究,限制后期蚀变期间的金属流动性。这些过程的年龄将受到放射性测年法的限制。过程速率将受到原位和实验室、非生物氧化和微生物改变实验的限制。我们将使用物理化学数值模型将这些观察结果结合在一起,以对当今海洋中这些大型多金属 muSMS 矿床的形成和保存建立一个连贯的理解。我们的方法需要两次巡航,即位于大西洋中脊 (MAR) 北纬 13 度 30 分钟的已知最大、特征最鲜明的 muSMS 场。尽管在技术上雄心勃勃,但我们从欧盟资助的蓝色矿业项目中获得的经验以及学术和工业合作伙伴的参与,贡献了实物数据和成本,显着降低了研究风险。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Ultramafic-Hosted Ni-Cu-Co-(As) Mineralization from an Ancient Oceanic Transform Fault Zone in the Troodos Ophiolite, Cyprus: An Analogue for Ultramafic Sea-Floor Massive Sulfide Mineralization?
塞浦路斯特罗多斯蛇绿岩古代海洋转换断裂带的超镁铁质镍铜钴(砷)矿化:超镁铁质海底块状硫化物矿化的类似物?
- DOI:10.5382/econgeo.4996
- 发表时间:2023
- 期刊:
- 影响因子:5.8
- 作者:Martin A
- 通讯作者:Martin A
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Christopher MacLeod其他文献
Christopher MacLeod的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Christopher MacLeod', 18)}}的其他基金
Mineralisation of the Brothers Volcano, Kermadec Arc (IODP Expedition 376)
克马德克弧兄弟火山的矿化(IODP 探险队 376)
- 批准号:
NE/S006214/1 - 财政年份:2019
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
Nature of the lower crust and Moho at slower-spreading ridges: SloMo Leg 1 (IODP Expedition 360)
下地壳的性质和缓慢扩张的山脊处的莫霍面:SloMo Leg 1 (IODP Expedition 360)
- 批准号:
NE/N019199/1 - 财政年份:2015
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
Role and extent of detachment faulting at slow-spreading mid-ocean ridges
缓慢扩张的洋中脊滑脱断层的作用和范围
- 批准号:
NE/J021741/1 - 财政年份:2014
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
Accretion of the lower oceanic crust at fast-spreading ridges: a rock drill and near-bottom seafloor survey in support of IODP drilling in Hess Deep.
快速扩张的海脊处下洋地壳的增生:支持赫斯深海 IODP 钻探的凿岩机和近海底调查。
- 批准号:
NE/C509023/1 - 财政年份:2008
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
相似海外基金
ULTRA - Ultramafic-hosted mineral Resource Assessment
ULTRA - 超镁铁质托管的矿产资源评估
- 批准号:
NE/S004319/1 - 财政年份:2020
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
ULTRA - Ultramafic-hosted mineral Resource Assessment
ULTRA - 超镁铁质托管的矿产资源评估
- 批准号:
NE/S004998/1 - 财政年份:2020
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
Mobilization of Metals in Oceanic core complex (MOMO): source to sink investigation of gabbroic-ultramafic hosted VMS deposits
大洋核心复合体 (MOMO) 中金属的流动:辉长岩-超镁铁质 VMS 矿床的源到汇研究
- 批准号:
460092619 - 财政年份:2020
- 资助金额:
$ 42.08万 - 项目类别:
Research Grants
ULTRA - Ultramafic-hosted mineral Resource Assessment
ULTRA - 超镁铁质托管的矿产资源评估
- 批准号:
NE/S004041/1 - 财政年份:2020
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
ULTRA - Ultramafic-hosted mineral Resource Assessment
ULTRA - 超镁铁质托管的矿产资源评估
- 批准号:
NE/S004068/1 - 财政年份:2020
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
ULTRA - Ultramafic-hosted mineral Resource Assessment
ULTRA - 超镁铁质托管的矿产资源评估
- 批准号:
NE/S004424/1 - 财政年份:2020
- 资助金额:
$ 42.08万 - 项目类别:
Research Grant
Serpentinization processes in the subsurface of a seafloor ultramafic-hosted hydrothermal system
海底超镁铁质热液系统地下的蛇纹石化过程
- 批准号:
1536242 - 财政年份:2015
- 资助金额:
$ 42.08万 - 项目类别:
Standard Grant
The third dimension of the ultramafic-hosted Logatchev-1 hydrothermal field: sulfide formation, evolution, and fluid flow in the subseafloor
超镁铁质 Logatchev-1 热液田的三维:海底硫化物的形成、演化和流体流动
- 批准号:
16462548 - 财政年份:2005
- 资助金额:
$ 42.08万 - 项目类别:
Priority Programmes
The genetic relationship between ultramafic-hosted massive sulfides and their host rocks: petrological, geochemical and isotopic investigations of hydrothermal systems along the Mid-Atlantic Ridge between 14°45`N and 15°05`N
超镁铁质块状硫化物与其母岩之间的成因关系:14°45`N至15°05`N之间大西洋中脊热液系统的岩石学、地球化学和同位素研究
- 批准号:
5416208 - 财政年份:2003
- 资助金额:
$ 42.08万 - 项目类别:
Priority Programmes
UltraMAfic-hosted seafloor MassIve sulfide deposits: a mineral system approach (UMAMI)
UltraMAfic 海底块状硫化物矿床:矿物系统方法 (UMAMI)
- 批准号:
521604747 - 财政年份:
- 资助金额:
$ 42.08万 - 项目类别:
Priority Programmes