The phrase "a marked widening" is correct and usable in written English.
It can be used to describe a noticeable or significant increase in size, scope, or extent of something.
Example: "The study revealed a marked widening of the income gap between different socioeconomic groups over the past decade."
Alternatives: "a significant increase" or "a noticeable expansion".
Hypometabolism is coupled with decreased perfusion, whereas marked widening of sulci may coexist with relatively preserved cognition (Mosley et al 2005).
Curiously, in an election marked by widening ethnic and communal tensions, the TMVP's candidates won in several areas dominated by Sinhalese and Muslims.In the two years since the government informally reignited the civil war partly in response to terrorist attacks by the Tigers several hundred young Tamil men have "disappeared" in eastern and northern Sri Lanka.
It also marks a widening gap in transatlantic approaches to Russia's apparent backing of the separatists who have been waging an insurgency in eastern Ukraine for nearly a year.
The changes in England's examinations mark a widening divide between education systems within the UK - with Wales and Northern Ireland so far not following the changes proposed in England.
The action marked a widening of US military action which has previously been restricted to northern Iraq.
The announcement by the group, the Common Cause Partnership, marks a widening of the fissures within the Episcopal Church and in the greater communion over the church's liberal stance on homosexuality.
The altercation marked a significant widening of the diplomatic repercussions spreading across Europe after France in July began deporting Roma to their homes in Romania and Bulgaria.
This half-century mark means widening the frame and realizing that between the Jordan River and the Mediterranean Sea, half the residents or more live as either second-class citizens or noncitizens because they are Palestinians.
