Resultados de Pesquisa

INGLÊS

Sr Isotopes In Seawater - Stratigraphy, Paleo-Tectonics, Paleoclimate, And Paleoceanography

de B. Lynn Ingram e Donald J. Depaolo

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA
INGLÊS

Iron Formations As Palaeoenvironmental Archives

de Andrey Bekker, Kaarel Mand, Kurt O. Konhauser, Leslie J. Robbins e Noah J. Planavsky

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Ancient iron formations - iron and silica-rich chemical sedimentary rocks that formed throughout the Precambrian eons - provide a significant part of the evidence for the modern scientific understanding of palaeoenvironmental conditions in Archaean (4.0â€"2.5 billion years ago) and Proterozoic (2.5â€"0.539 billion years ago) times.
INGLÊS

Molybdenum As A Paleoredox Proxy - Past, Present, And Future

de Alexander J. Dickson, Anthony Chappaz e Stephan R. Hlohowskyj

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 In this Element, we propose a refinement of molybdenum (Mo) geochemistry within aquatic systems, ancient rocks, and modern sediments through molecular geochemistry. Specifically, to intermediate sulfide concentrations governing Mo behavior below the â€œswitch-pointâ€ and dominant sequestration pathways in low oxygen conditions.
INGLÊS

Lithium Isotopes - A Tracer Of Past And Present Silicate Weathering

de A. Joshua West, Mathieu Dellinger e Philip A. E. Pogge Von Strandmann

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA
INGLÊS

Emerging Patterns In Proterozoic Lipid Biomarker Records

de Gordon D. Love e J. Alex Zumberge

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Diverse and abundant lipid biomarker assemblages have been reported from a variety of Proterozoic marine environments from the careful analysis of well-preserved rocks and oils. We summarize the major temporal trends evident in Proterozoic biomarker distributions and relate this to changing marine communities and environments.
INGLÊS

Earth History Of Oxygen And The Iproxy

de Ellen Thomas, Rosalind E. M. Rickaby, Wanyi Lu e Zunli Lu

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 How oxygen levels in Earth's atmosphere and oceans evolved has always been a central question in Earth System Science. We review the rationale behind using iodine incorporated in calcium carbonate (including biogenic) minerals as a proxy for dissolved oxygen in seawater, its recent applications and some potential future research directions.
INGLÊS

Cerium Anomalies And Paleoredox

de Rosalie Tostevin

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Ce anomalies track changes in oxygen availability due to the anomalous redox-sensitivity of Ce compared with the other rare earth elements. This review focusses on the systematics of the Ce anomaly proxy, the preservation and extraction of the signal in sedimentary rocks, and the potential applications of the proxy.
INGLÊS

Nitrogen Isotopes In Deep Time

de Aubrey L. Zerkle e Colin Mettam

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Stable isotope ratios of nitrogen compounds are preserved in the sedimentary record and track these changes over Earth's history, providing important insights into associated biogeochemical feedbacks. Here we review the use of nitrogen stable isotope geochemistry in unravelling the evolution of the global N cycle in deep time.
INGLÊS

Calcium Isotopes

de Elizabeth M. Griffith e Matthew S. Fantle

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Precise measurements of the calcium (Ca) isotopes have provided constraints on Ca cycling at global and local scales, and quantified rates of carbonate diagenesis in marine sedimentary systems. Key to applying Ca isotopes as a geochemical tracer is understanding the impact of multiple factors potentially impacting Ca isotopes in the rock record.
INGLÊS

Vanadium Isotopes - A Proxy For Ocean Oxygen Variations

de Sune G. Nielsen

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Vanadium isotope ratios (51V/50V) have potential to provide information about changes in past ocean oxygen contents. The oxygen abundance sensitivity range of V isotopes suggests that this paleoproxy could be particularly useful in tracing marine oxygenation changes throughout the Phanerozoic and potentially beyond.
INGLÊS

Pelagic Barite - Tracer Of Ocean Productivity And A Recorder Of Isotopic Compositions Of Seawater S, O, Sr, Ca And Ba

de Adina Paytan, Elizabeth Griffith e Weiqi Yao

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Paleo-reconstruction involves the use of tracers that record seawater compositions, which in turn may be used to infer oceanic processes. Several important tracers are incorporated into pelagic barite: here we summarize the utility of pelagic barite for the reconstruction of export production and as a recorder of seawater S, O, Sr, Ca and Ba.
INGLÊS

Pyrite Trace Element Paleo-Ocean Chemistry Proxy

de Daniel D. Gregory

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 The use of the trace element content of sedimentary pyrite as a proxy for the trace element composition of past oceans has recently emerged. The pyrite proxy has several potential advantages over bulk sample analysis, and these strengths make the pyrite trace element proxy is a valuable potential addition to the paleo-ocean chemistry tool kit.
INGLÊS

Selenium Isotope Paleobiogeochemistry

de Eva E. Stueken e Michael A. Kipp

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 The attraction of selenium isotopes as a paleoenvironmental tracer lies in the high redox potential of selenium oxyanions (SeIV and SeVI), the dominant species in the modern ocean. The largest isotopic fractionations occur during oxyanion reduction, which makes selenium isotopes a sensitive proxy for the redox evolution of our planet.
INGLÊS

Tex86 Paleotemperature Proxy

de Gordon N. Inglis e Jessica E. Tierney

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 The TEX86 paleothermometer is based upon the distribution of archaeal membrane lipids ('GDGTs') in marine sediments. We review the principles of the TEX86 proxy and developments made over the last two decades. We also discuss its application as a paleotemperature proxy and explore existing challenges and limitations.
INGLÊS

Application Of Thallium Isotopes - Tracking Marine Oxygenation Through Manganese Oxide Burial

de Jeremy D. Owens

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Tracking initial ocean (de)oxygenation is critical to better constrain the coevolution of life and environment. Development of thallium isotopes has provided evidence to track the global manganese oxide burial which responds to early (de)oxygenation for short-term climate events. This Element provides an introduction to the application of thallium isotopes, case studies, and future directions.
INGLÊS

Triple Oxygen Isotopes

de Huiming Bao

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This Element focuses on the history of discovery of triple isotope effects, the conceptual framework behind these effects, and major lines of development in the past few years of triple oxygen isotope research.
INGLÊS

Uranium Isotope Paleoredox Proxy

de Feifei Zhang, Kimberly V. Lau e Stephen J. Romaniello

23,85€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Uranium isotopes have emerged as a proxy to reconstruct the redox conditions of the Earth's oceans and atmosphere. This Element covers the background, methods, and case studies of this promising tool for understanding Earth's environmental transitions, as rapid development continues to refine the accuracy of interpretations of 238U/235U records.

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