science

Weissert Event

Weissert Event is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Weissert Event rather than just read about it. In short: The Weissert Event, also referred to as the Weissert Thermal Excursion (WTX), was a hyperthermal event that occurred in the Valanginian stage of the Early Cretaceous epoch. This thermal excursion occurred amidst the relatively cool Tithonian-early Barremian Cool Interval (TEBCI).

Key takeaways

Weissert Event belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Weissert Event to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Weissert Event from memory before moving on to harder problems.

Reference excerpt

The Weissert Event, also referred to as the Weissert Thermal Excursion (WTX), was a hyperthermal event that occurred in the Valanginian stage of the Early Cretaceous epoch. This thermal excursion occurred amidst the relatively cool Tithonian-early Barremian Cool Interval (TEBCI). Its termination marked an intense cooling event, potentially even an ice age.

Duration The start of the WTX has been astrochronologically dated by one study to 134.50 ± 0.19 million years ago (Ma), with its positive δ13C excursion being found to last until 133.96 ± 0.19 Ma and the plateau phase of elevated δ13C values until 132.44 ± 0.19 Ma. However, astrochronological studies of sediments in the Vocontian Basin have yielded a duration of 2.08 Myr, with the positive δ13C excursion being 0.94 Myr in duration and the δ13C plateau being 1.14 Myr. A different study concludes the WTX lasted for about 1.4 million years (Myr) based on the chronological length of the high δ13C plateau observed over its course in the Bersek Marl Formation of Hungary.

Causes An addition of carbon dioxide into the atmosphere via the activity of the Paraná-Etendeka Large Igneous Province (PE-LIP) is generally accepted as the leading candidate for what sparked the WTX, although this is not universally accepted, with some reconstructed geochronologies showing a lack of causality between the emplacement of the PE-LIP and the onset of the WTX. The prolonged, drawn out manner in which the PE-LIP erupted has been brought up as a further argument against its emplacement as the driving perturbation causing the WTX.

Effects The WTX resulted in a rapid global temperature increase during the otherwise mild TEBCI. The sharp jump in global temperatures during this hyperthermal event was accompanied by oceanic anoxia. However, unlike other oceanic anoxic events, the WTX is not associated with widespread black shale deposits. Nannoconids experienced a decline at the onset of the WTX resulting from marine regression, but bloomed in abundance later on in the event as ocean productivity skyrocketed. In the Vocontian Basin, the WTX is associated with an increase in marlstones. At the end of the WTX, temperatures cooled by ~1–2 °C based on the results of palaeothermometry done in southern France, whereas the Boreal Ocean and its surroundings cooled by as much as 4 °C. Geochemical records of 187Os/188Os point to an increase in unradiogenic osmium flux into the ocean, suggesting the occurrence of silicate weathering of PE-LIP basalts during this slice of time, providing the most likely explanation for the temperature drop. Some studies have suggested that a transient ice age with limited but significant polar ice caps occurred in the aftermath of the WTX, although the lack of a positive δ18Oseawater excursion during the latest Valanginian interval of cooling and the presence instead of a very slightly negative excursion calls into question the existence of any significant polar ice growth.

References

Worked examples

Example 1 — a first encounter with Weissert Event

Start with the simplest possible case. Write down what Weissert Event claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Weissert Event before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Weissert Event ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Weissert Event

In research: Weissert Event appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Weissert Event in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Weissert Event is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anoxic events, Valanginian Stage, so understanding it makes those chapters shorter.
In everyday life: Look for Weissert Event outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Weissert Event in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Weissert Event means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Weissert Event out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Weissert Event in simple terms?

Why does Weissert Event matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Weissert Event?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Weissert Event.