Sulfur and Oxygen Isotope Compositions of Seawater Sulfate as Recorded in Marine Barite
海洋重晶石中记录的海水硫酸盐的硫和氧同位素组成
基本信息
- 批准号:9628479
- 负责人:
- 金额:$ 19.97万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:1996
- 资助国家:美国
- 起止时间:1996-08-01 至 1999-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Kastner 9628479 Global changes in climate and atmospheric chemistry are intimately related to the sulfur and carbon sedimentary cycles. Evidence for large scale transfers of S and C between the sedimentary reservoirs is provided by the isotope records of oceanic sulfate and carbon. Coupling between the S and C reservoirs maintains a steady-state atmospheric oxygen reservoir. Thus, an increase in the rate of sulfide oxidation must be compensated by an increase in the rate of organic C burial, resulting in an overall inverse relationship between marine 34Ssulfate and 34Scarbonate, as observed. A high resolution marine carbonate 13C age curve exists. The evidence that S and O isotope compositions of seawater sulfate have fluctuated significantly through the Phanerozoic, is mostly based on the comprehensive isotope data obtained from marine evaporite sulfates; but the geological record of marine evaporites is episodic, with gaps of millions of years. Evaporites are also susceptible to diagenesis, their age control could be problematic, and the purely marine origin of some is questionable; it is therefore important to identify another marine phase that reliably records and maintains seawater sulfate S and O isotope compositions. Marine barite is a readily available ubiquitous minor phase in deep-sea sediments, it is continuously deposited, its associated sediment ages can be determined, it is not susceptible to diagenetic alteration in oxic sediments, and has been shown to record reliably seawater Sr isotope composition; it seems to be a very suitable mineral for this study. Thus, the objectives of this research are: (I) to confirm that marine barite is a reliable recorder of seawater sulfate S and O isotope values, (II) to construct detailed, continuous, well dated seawater sulfate S and O isotope records over the past 65 m.y., (III) to construct high resolution S and O isotope records during three special time intervals (1) the Messinian event, (2) the Cretaceous-Tertiary boundary , and (3) the distinct minimum in 34S near the Albian-Aptian boundary, using well dated deep-sea sediments. The refined S and O isotope curves of seawater sulfate will be related to the oceanic 13C record of carbonates and interpreted in terms of the processes controlling the dynamic balance between the oceanic S and C input and output fluxes. The role of increased weathering fluxes, especially from the Himalayan uplift over the past -40 m.y., will also be evaluated by correlating data from this research with the existing 12C/12C and 87Sr/86Sr seawater data for this time interval. The emphasis of the work will be on barite that will be separated from sediments of Holocene to 65Ma age, at about 1 to 2 million year intervals. Barite samples from the Holocene to 38 Ma have previously been analyzed by us for their Sr-isotope composition. For the three "special" geologic time intervals higher resolution sampling will be carried out at an interval of about 0.5 m.y. The habit of the barite crystals that will be studied by SEM, and Sr- isotope composition of the separated barites will be tests for possible diagenesis. Continuous records of seawater sulfate S and O isotope values, by analyses of marine barite, and their correlation with existing high resolution oceanic C and Sr isotope age curves, should help to unravel the climate-tectonic coupling during these three important geological events.
Kastner 9628479 全球气候和大气化学变化与硫和碳沉积循环密切相关。 大洋硫酸盐和碳的同位素记录提供了沉积物储层之间大规模硫和碳转移的证据。 S 和 C 储层之间的耦合维持了稳态大气氧储层。 因此,硫化物氧化速率的增加必须通过有机碳埋藏速率的增加来补偿,从而导致海洋 34S硫酸盐和 34S碳酸盐之间总体呈反比关系,如所观察到的。 存在高分辨率海相碳酸盐 13C 年龄曲线。 海水硫酸盐的S和O同位素组成在显生宙显着波动的证据主要基于从海洋蒸发硫酸盐获得的综合同位素数据;但海洋蒸发岩的地质记录是间歇性的,间隔数百万年。 蒸发岩也容易受到成岩作用的影响,其年龄控制可能存在问题,并且某些蒸发岩的纯粹海洋起源值得怀疑;因此,确定另一个能够可靠记录和维护海水硫酸盐 S 和 O 同位素组成的海洋相非常重要。 海相重晶石是深海沉积物中随处可见的次要相,它是连续沉积的,可以确定其相关的沉积物年龄,它不易受含氧沉积物中成岩蚀变的影响,并且已被证明可以可靠地记录海水锶同位素组成;它似乎是一种非常适合这项研究的矿物。 因此,本研究的目标是:(I) 确认海洋重晶石是海水硫酸盐 S 和 O 同位素值的可靠记录器,(II) 构建详细、连续、过时的海水硫酸盐 S 和 O 同位素记录。过去65年,(III)在三个特殊时间间隔(1)麦西尼亚事件,(2)白垩纪-第三纪边界,以及(3)使用已确定年代的深海沉积物,在阿尔布-阿普第阶边界附近的 34S 中发现了明显的最小值。 精制的海水硫酸盐S和O同位素曲线将与海洋碳酸盐13C记录相关,并根据控制海洋S和C输入和输出通量之间动态平衡的过程进行解释。 还将通过将本研究的数据与该时间间隔的现有 12C/12C 和 87Sr/86Sr 海水数据相关联来评估风化通量增加的作用,特别是过去 -40 m.y 期间喜马拉雅隆起的作用。 这项工作的重点是从全新世至 65Ma 年龄的沉积物中分离出重晶石,间隔时间约为 1 至 200 万年。 我们之前已经分析了从全新世到 38 Ma 的重晶石样品的 Sr 同位素组成。 对于三个“特殊”地质时间间隔,将以约 0.5 m.y 的间隔进行更高分辨率的采样。 将通过SEM研究重晶石晶体的习性,以及分离的重晶石的Sr同位素组成将测试可能的成岩作用。 通过分析海洋重晶石,连续记录海水硫酸盐 S 和 O 同位素值,及其与现有高分辨率海洋 C 和 Sr 同位素年龄曲线的相关性,应有助于揭示这三个重要地质事件期间的气候-构造耦合。
项目成果
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Miriam Kastner其他文献
Proximal impact deposits at the Cretaceous-Tertiary boundary in the Gulf of Mexico: a restudy of DSDP Leg 77 Sites 536 and 540.
墨西哥湾白垩纪-第三纪边界的近端撞击沉积物:对 DSDP Leg 77 站点 536 和 540 的重新研究。
- DOI:
- 发表时间:
1992 - 期刊:
- 影响因子:5.8
- 作者:
W. Alvarez;Jan Smit;William Lowrie;F. Asaro;Stanley V. Margolis;Philippe Claeys;Miriam Kastner;Alan R. Hildebrand - 通讯作者:
Alan R. Hildebrand
Miriam Kastner的其他文献
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{{ truncateString('Miriam Kastner', 18)}}的其他基金
Elemental and Isotopic Systematics in Erosional and Accretionary Subduction Zones, with Implications for Fluid Sources, Pathways, and Fluxes
侵蚀和增生俯冲带的元素和同位素系统学,对流体源、路径和通量的影响
- 批准号:
1153870 - 财政年份:2012
- 资助金额:
$ 19.97万 - 项目类别:
Standard Grant
Collaborative Research: Chemical, pressure, temperature, and flow constraints on hydrologic horizons in the Costa Rica Subduction zone, ODP Sites 1253 and 1255
合作研究:哥斯达黎加俯冲带水文层的化学、压力、温度和流量限制,ODP 站点 1253 和 1255
- 批准号:
0825145 - 财政年份:2008
- 资助金额:
$ 19.97万 - 项目类别:
Standard Grant
Chlorine and Its Stable Isotope Budgets in Subduction Zones: Implications for Serpentinization and Cycling of Cl and Water
俯冲带中的氯及其稳定同位素收支:对蛇纹石化以及氯和水循环的影响
- 批准号:
0453064 - 财政年份:2005
- 资助金额:
$ 19.97万 - 项目类别:
Continuing Grant
Collaborative Research: Long-term Continuous Monitoring of Pressure, Fluid Chemistry, and Hydrology in Instrumented Boreholes at the Costa Rica Subduction Zone
合作研究:哥斯达黎加俯冲带仪器钻孔中压力、流体化学和水文的长期连续监测
- 批准号:
0118478 - 财政年份:2001
- 资助金额:
$ 19.97万 - 项目类别:
Standard Grant
Collaborative Research: Long Term Continuous Sampling of Fluids in Instrumented Boreholes on the Eastern Flank of the Juan de Fuca Ridge
合作研究:胡安德富卡山脊东侧仪器钻孔中流体的长期连续采样
- 批准号:
9811557 - 财政年份:1998
- 资助金额:
$ 19.97万 - 项目类别:
Standard Grant
SGER: Trace Gas Chemistry and Dating Seafloor Gas Hydrates
SGER:痕量气体化学和海底气体水合物年代测定
- 批准号:
9817612 - 财政年份:1998
- 资助金额:
$ 19.97万 - 项目类别:
Standard Grant
A Seafloor Sampler for the Investigation of Fluid Flow Rates and Mass Fluxes in Subduction Zones and Ridge Flanks
用于研究俯冲带和脊翼流体流速和质量通量的海底采样器
- 批准号:
9730477 - 财政年份:1998
- 资助金额:
$ 19.97万 - 项目类别:
Standard Grant
Collaborative Research: The Flux of Carbon from a Modern Accretionary Prism; In-Situ Measurements of Hydrocarbon Sequestration as Gas Hydrates and Diagenetic Carbonate
合作研究:来自现代吸积棱镜的碳通量;
- 批准号:
9712135 - 财政年份:1997
- 资助金额:
$ 19.97万 - 项目类别:
Continuing Grant
Neodymium Isotope Ratios of Marine Barite: A Tool for Reconstruction of Paleocirculation
海洋重晶石的钕同位素比:重建古循环的工具
- 批准号:
9521258 - 财政年份:1996
- 资助金额:
$ 19.97万 - 项目类别:
Standard Grant
Collaborative Research: Chlorine Stable Isotope Composition of Subduction Zone Sediments and Pore Waters
合作研究:俯冲带沉积物和孔隙水的氯稳定同位素组成
- 批准号:
9529953 - 财政年份:1996
- 资助金额:
$ 19.97万 - 项目类别:
Continuing Grant
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