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Matthew T. Hurtgen
Northwestern University
50Publications
20H-index
1,502Citations
Publications 50
Newest
#1Jiuyuan Wang (NU: Northwestern University)
#2Andrew D. Jacobson (NU: Northwestern University)H-Index: 20
Last.Shu-zhong Shen (NU: Nanjing University)H-Index: 31
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Abstract We report high-resolution, high-precision δ44/40Ca, δ88/86Sr, and 87Sr/86Sr records spanning the Permian-Triassic boundary (PTB) from the Meishan and Dajiang carbonate successions in south China. The goal of the study was to understand the behavior of Ca and Sr isotopes during a time period in Earth history characterized by severe biological and environmental perturbations, including a major mass extinction, flood basalt volcanism, ocean acidification, and sea level fluctuations. Dajian...
#1Brian Kristall (NU: Northwestern University)H-Index: 2
#2Andrew D. Jacobson (NU: Northwestern University)H-Index: 20
Last.Matthew T. Hurtgen (NU: Northwestern University)H-Index: 20
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Abstract Coupled modeling of biogeochemical cycles leads to improved constraints on elemental fluxes and helps to identify mechanisms that drive secular variations in isotopic records. Here, we develop a coupled strontium-sulfur isotope mass-balance model to examine the Early Cretaceous marine sulfate (δ 34 S sw ) and strontium ( 87 Sr/ 86 Sr) isotope records. We also present an expanded marine barite S isotope record and pyrite S isotope record for the Early Cretaceous with updated age models i...
#1Jennifer V. Mills (NU: Northwestern University)H-Index: 3
#2Maya L. Gomes (NU: Northwestern University)H-Index: 3
Last.Matthew T. Hurtgen (NU: Northwestern University)H-Index: 20
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Early Cretaceous (145–100 Ma) rocks record a ∼5‰ negative shift in the sulfur isotope composition of marine sulfate, the largest shift observed over the past 130 m.y. Two hypotheses have been proposed to explain this shift: (1) massive evaporite deposition associated with rifting during opening of the South Atlantic, and (2) increased inputs of volcanically derived sulfur due to eruption of large igneous provinces. Each process produces a very different impact on marine sulfate concentrations, w...
#1Brian Kristall (NU: Northwestern University)H-Index: 2
#2Andrew D. Jacobson (NU: Northwestern University)H-Index: 20
Last.Matthew T. Hurtgen (NU: Northwestern University)H-Index: 20
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Abstract While uniformitarianism underlies many aspects of the Earth sciences, modeling geochemical cycles throughout Earth history requires critically assessing the reliability and constancy of projecting modern fluxes and their isotope ratios into deep geologic time. In this study, we develop an iterative technique for modeling the radiogenic strontium isotope composition ( R 87 = 87 Sr/ 86 Sr) of seawater (sw) during the Phanerozoic utilizing as a constraint the composite record of McArthur e...
#1Sara B. Pruss (Smith College)H-Index: 22
#2Katherine A. Castagno (WHOI: Woods Hole Oceanographic Institution)H-Index: 1
Last.Matthew T. Hurtgen (NU: Northwestern University)H-Index: 20
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Abstract Carbonates of western Newfoundland span the Cambro-Ordovician interval and preserve a record of slope-basinal deposition in the Cow Head Group near Cow Head. This unit consists of conglomerates and ribbon and laminated limestone interbedded with shale that is well exposed in sea cliffs at Cow Head Peninsula. These conglomerates, although prevalent throughout the section, vary in thickness and abundance stratigraphically and record both local disruption and large-scale episodic sedimenta...
#1Chris Holmden (U of S: University of Saskatchewan)H-Index: 30
#2Andrew D. Jacobson (NU: Northwestern University)H-Index: 20
Last.Matthew T. Hurtgen (NU: Northwestern University)H-Index: 20
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Abstract Chromium offers a redox sensitive isotopic proxy with potential for tracing past oxygen levels in the oceans. We explore this potential in a pelagic succession of marine carbonate sediment deposited during Cretaceous Ocean Anoxic Event 2 (OAE 2) in the Western Interior Seaway, Colorado (WIS), using the USGS Portland #1 Core. Reduction of Cr(VI) causes light isotopes of Cr to preferentially partition into Cr(III). Because Cr(VI) is the thermodynamically favoured species in oxygenated sea...
#1Maya L. Gomes (NU: Northwestern University)H-Index: 3
#2Matthew T. Hurtgen (NU: Northwestern University)H-Index: 20
Last.Bradley B. Sageman (NU: Northwestern University)H-Index: 35
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Biogeochemical sulfur cycling has varied widely over geologic time, mainly in response to changes in primary productivity and organic carbon burial, volcanism, weathering, and evaporite deposition. Several of these processes are explicitly linked to discreet (<1.2 Ma) intervals of widespread organic carbon burial, termed oceanic anoxic events (OAEs). During the Cretaceous, there is a highly distinctive ~4‰ negative excursion in the sulfur isotope composition of seawater sulfate (δ34SSO4) that is...
#1Maya L. Gomes (NU: Northwestern University)H-Index: 3
#2Matthew T. Hurtgen (NU: Northwestern University)H-Index: 20
Last.Bradley B. Sageman (NU: Northwestern University)H-Index: 35
view all 3 authors...
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