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Secular variation in seawater chemistry: An explanation for the coupled secular variation in the mineralogies of marine limestones and potash evaporites over the past 600 m.y.
Abstract
The youngest sampled submarine lava flow, which erupted June 1993 on the Juan de Fuca Ridge, provides the basis for a tight constraint on the initial or zero-age magnetization state of MORB. Detailed profiles of magnetic hysteresis parameters, Curie temperatures, and unblocking temperatures of NRM with respect to the chilled margin of a pillow fragment show evidence of significant oxidation, which preferentially affected the finest grain-size fraction and principal remanence carrier of the titanomagnetite magnetic mineralogy. The oxidation must have occurred during or immediately after initial cooling, implying that MORB is already appreciably magnetically altered before aging. Nevertheless, successful results of Thellier paleointensity experiments on the basalt sample lend support to the idea that crustal magnetization represented by MORB preserves a record of geomagnetic intensity variations that may be reflected in small-scale magnetic anomalies.
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“Such phenomena have previously been linked to shoaling of oxygen-depleted waters during a major marine transgression 21,36 , which has been suggested as the cause of the major extinction pulse of the BTE (Sinsk event; Fig. 1).”
From Possible links between extreme oxygen perturbations and the Cambrian radiation of animals (2019) · cites this paper as [21]
In the citing paper
“the δ 34 S trend across the early Cambrian Stage 4 Botoman-Toyonian extinctions (BTE; the first animal mass extinction of the Phanerozoic Eon) 21,22 is characterised by rapid fluctuations of large magnitude that are decoupled from the carbon isotope record (Fig. 1).”
From Possible links between extreme oxygen perturbations and the Cambrian radiation of animals (2019) · cites this paper as [21]
In the citing paper
“The expansion of shallow ocean anoxia is consistent with an observed accumulation of over ~750,000 km 2 of black organic-rich carbonate-rich sediments (comprising bituminous limestone, chert and argillaceous calcareous sapropelic shale) in the Sinsk Formation across the Siberian Platform, as well as enrichments in pyrite, V, As, Cr, Cu and Ni, and the presence of abundant biomarkers indicative of”
From Possible links between extreme oxygen perturbations and the Cambrian radiation of animals (2019) · cites this paper as [21]
In the citing paper
“This dataset is an upgrade of a previously published version 21 (see supplementary information for detailed description and source of data).”
From Possible links between extreme oxygen perturbations and the Cambrian radiation of animals (2019) · cites this paper as [21]
In the citing paper
“The Sinsk Event, accompanied by a negative CIE, is a further short-lived anoxic interval at ~513 Ma (11).”
From Integrated records of environmental change and evolution challenge the Cambrian Explosion (2019) · cites this paper as [11]
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Metadata
- Authors
- Hardie, L. A.
- Venue
- Geology
- Published
- 1996
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- CoChat. (2026). Citation check: Secular variation in seawater chemistry: An explanation for the coupled secular variation in the mineralogies of marine limestones and potash evaporites over the past 600 m.y. https://app.cochat.ai/papers/10.1130/0091-7613(1996)024%3C0279:svisca%3E2.3.co;2
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- Hardie, L. A. (1996). Secular variation in seawater chemistry: An explanation for the coupled secular variation in the mineralogies of marine limestones and potash evaporites over the past 600 m.y. Geology. https://doi.org/10.1130/0091-7613(1996)024%3C0279%3Asvisca%3E2.3.co%3B2
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